阅读说明：本技术 一种远程激光融冰系统及方法 (Remote laser ice melting system and method ) 是由 李路明 颜哲昊 肖子洋 刘兴 郑富永 王�华 余志琴 陈江兴 常海峰 张治国 于 2019-10-21 设计创作，主要内容包括：本发明实施例公开了一种远程激光融冰系统及方法,包括覆冰监测装置,所述系统还包括反馈装置、激光器自瞄准装置、激光器控制装置、激光器；反馈装置,用于将所述覆冰监测装置获得的监测数据解调为覆冰厚度数据,并反馈给所述激光器控制装置；激光器控制装置,用于根据所述覆冰厚度数据,控制激光器对所述架空线缆进行融冰操作；所述激光器自瞄准装置,用于对架空线缆上的融冰位置进行定位和瞄准；所述激光器,用于输出激光,对所述架空线缆进行融冰。能够远程对架空线缆上的覆冰情况进行检测,并且远程对覆冰进行除冰操作,大大提升了除冰效率,降低了除冰成本。(The embodiment of the invention discloses a remote laser ice melting system and a method, wherein the system comprises an ice coating monitoring device, a feedback device, a laser self-aiming device, a laser control device and a laser; the feedback device is used for demodulating the monitoring data obtained by the icing monitoring device into icing thickness data and feeding the icing thickness data back to the laser control device; the laser control device is used for controlling the laser to melt the ice of the overhead cable according to the ice coating thickness data; the laser self-aiming device is used for positioning and aiming the ice melting position on the overhead cable; the laser is used for outputting laser and melting ice on the overhead cable. The ice coating condition on the overhead cable can be remotely detected, and the ice coating operation is remotely performed, so that the ice removing efficiency is greatly improved, and the ice removing cost is reduced.)

1. An ice coating monitoring device for remotely monitoring ice coating on an overhead cable, the device comprising:

the light source module is used for generating tunable laser and outputting the tunable laser to the first light path module and the second light path module through the first coupler;

the first optical path module is connected to the overhead cable through a circulator, and is used for receiving the optical signal generated by the light source module and outputting a test optical signal;

the second light path module is used for receiving the optical signal generated by the light source module and outputting a trigger optical signal;

the data acquisition module is used for carrying out data acquisition on the test optical signal according to the trigger optical signal;

and the data processing module is used for receiving the data acquired by the data acquisition module and processing the acquired data to obtain the icing thickness of the overhead cable.

2. The apparatus of claim 1, wherein the overhead cable contains optical fibers therein.

3. The icing monitoring device of claim 1, wherein the light source module is further configured to output a TTL signal to the data acquisition module to control activation of the data acquisition module.

4. The icing monitoring device of claim 1 wherein the light source module comprises a single longitudinal mode narrow linewidth tunable laser.

5. The icing monitoring device of claim 1, wherein the collected data includes a beat signal; the processing of the acquired data includes cross-correlation processing.

6. The icing monitoring device of claim 1, wherein the data collecting the test light signal according to the trigger light signal comprises: and sampling the test optical signal at equal optical frequency intervals according to a clock formed by the trigger optical signal so as to eliminate the sweep frequency nonlinearity of the optical source.

7. The icing monitoring device of claim 1,

the first optical path module comprises a main interferometer receiving part, and the main interferometer receiving part receives optical signals in a frequency mixing type polarization grading receiving mode;

the second optical path module comprises an auxiliary interferometer, and the auxiliary interferometer is used for generating a trigger optical signal and triggering the data acquisition module so as to eliminate the sweep frequency nonlinearity of the light source.

8. The icing monitoring device of claim 1,

the first optical path module comprises a circulator, a second coupler, a third coupler, a polarization beam splitter Prism (PBS), a first photodiode and a second photodiode, wherein an input optical signal from the first coupler passes through the second coupler and then is output to the circulator and the third coupler respectively, the second end of the circulator is connected to an overhead cable, the third end of the circulator is connected to the third coupler, one end of the third coupler is connected to the PBS, the other end of the PBS is simultaneously connected to the first photodiode and the second photodiode, and the other ends of the first photodiode and the second photodiode are simultaneously connected to the data acquisition module;

the second optical path module comprises a fourth coupler, a fifth coupler and a third photodiode, wherein an input optical signal from the first coupler is divided into two paths after passing through the fourth coupler, the two paths are respectively transmitted into the fifth coupler through different optical fibers, the other end of the fifth coupler is connected to the third photodiode, and the other end of the third photodiode is connected to the data acquisition module.

9. The icing monitoring device of claim 1, wherein the processing step of the data processing module comprises:

a mapping step of mapping the acquired data from an optical frequency domain to a distance domain by Fast Fourier Transform (FFT);

a reflection step, dividing the overhead cable optical fiber into n sections by using a sliding window in a distance domain, and mapping the distance domain information corresponding to each section of optical fiber from the distance domain to an optical frequency domain by fast inverse Fourier transform (IFFT);

and a demodulation step, in an optical frequency domain, demodulating the Rayleigh scattering spectrum peak offset before and after the stress change of the overhead cable corresponding to each section of optical fiber by using a cross-correlation algorithm, and calculating the stress variation of the overhead cable corresponding to each section of optical fiber according to the offset so as to obtain the ice coating data of the overhead cable.

10. A remote laser de-icing system comprising an icing monitoring device according to any one of claims 1-9, the system further comprising a feedback device, a laser self-aiming device, a laser control device, a laser; wherein the content of the first and second substances,

the feedback device is used for demodulating the monitoring data obtained by the icing monitoring device into icing thickness data and feeding the icing thickness data back to the laser control device;

the laser control device is used for controlling a laser to melt ice on the overhead cable according to the ice coating thickness data;

the laser self-aiming device is used for positioning and aiming the ice melting position on the overhead cable;

the laser is used for outputting laser and melting ice on the overhead cable.

11. The laser ice melting system of claim 10, wherein said controlling the laser to melt ice on the overhead cable comprises controlling at least one of a start-up, a shut-down of the laser, a laser beam size, a laser beam travel speed, and a laser output power.

12. An icing monitoring method for an icing monitoring device according to one of claims 1 to 9, characterized in that the method comprises:

a data acquisition step, under the same test condition, triggering and acquiring the test optical signal of the first optical path module according to the beat frequency signal of the trigger optical signal generated by the second optical path module to obtain reference data and test data, wherein the reference data and the test data are optical frequency domain signals;

a mapping step of mapping the reference data and the test data from an optical frequency domain to a distance domain by a Fast Fourier Transform (FFT);

a reflection step, dividing the overhead cable optical fiber into n sections by using a sliding window in a distance domain, and mapping the distance domain information corresponding to each section of optical fiber from the distance domain to an optical frequency domain by fast inverse Fourier transform (IFFT);

and a demodulation step, in an optical frequency domain, demodulating the Rayleigh scattering spectrum peak offset before and after the stress change of the overhead cable corresponding to each section of optical fiber by using a cross-correlation algorithm, and calculating the stress variation of the overhead cable corresponding to each section of optical fiber according to the offset so as to obtain the ice coating data of the overhead cable.

Technical Field

The embodiment of the invention relates to the technical field of photoelectricity, in particular to an overhead ground wire remote laser ice melting system and method based on a distributed optical fiber sensing technology.

Background

With the continuous deepening of the marketization process of the power grid and the continuous improvement of the reliability and quality requirements of users on electric energy, the power industry is facing unprecedented challenges and opportunities, and the construction of a controllable, safe, reliable, environment-friendly and economic intelligent power grid system is becoming a common target of the global power industry.

In recent years, the ice coating removal at home and abroad can be roughly divided into a mechanical ice removal method, a thermal ice removal method and an artificial ice removal method, wherein the mechanical ice removal method mainly utilizes the mechanical effect of a transmission line lead to destroy the mechanical balance of the ice coating so as to lead the ice coating to fall off; the thermal deicing method is mainly characterized in that one end of a deicing circuit is manually short-circuited in two phases or three phases, an deicing alternating-current power supply is provided at the other end, a wire is heated by large short-circuit current (controlled within the maximum allowable current range of the wire), and covered ice is melted; the manual deicing method mainly depends on manpower to remove the coated ice. The manual deicing method and the mechanical deicing method are too low in efficiency and time-consuming and labor-consuming, and although the thermal deicing method can effectively realize deicing of the power transmission line, the deicing of the overhead ground wire cannot be realized.

In the process of implementing the invention, the inventor finds that the icing thickness of the overhead cable is difficult to be accurately estimated, and a deicer can only estimate and intensively process the icing in a certain area according to experience, so that the resource waste exists, and the cable really needing deicing cannot be processed in time.

Disclosure of Invention

In view of this, the embodiment of the present invention provides an icing monitoring device, which can monitor the icing condition on an overhead cable in real time under a passive condition, so as to solve the problem that the icing thickness of a remote cable cannot be determined; meanwhile, the embodiment of the invention also provides a laser ice melting system, and the ice coating on the overhead cable is remotely deiced on the basis of the monitoring data of the ice coating monitoring device, so that the deicing efficiency is further improved, the deicing cost is reduced, and the laser ice melting system has great practical value and market value.

In a first aspect, an embodiment of the present invention provides an ice coating monitoring device for remotely monitoring ice coating on an overhead cable, where the device includes:

the light source module is used for generating tunable laser and outputting the tunable laser to the first light path module and the second light path module through the first coupler;

the first optical path module is connected to the overhead cable through a circulator, and is used for receiving the optical signal generated by the light source module and outputting a test optical signal;

the second light path module is used for receiving the optical signal generated by the light source module and outputting a trigger optical signal;

the data acquisition module is used for carrying out data acquisition on the test optical signal according to the trigger optical signal;

and the data processing module is used for receiving the data acquired by the data acquisition module and processing the acquired data to obtain the icing thickness of the overhead cable.

Optionally, the overhead cable may be an overhead ground wire, and the cable includes an optical fiber therein.

Optionally, the light source module is further configured to output a TTL signal to the data acquisition module to control the start of the data acquisition module.

Optionally, the light source module may be a single longitudinal mode narrow linewidth tunable laser.

Optionally, the acquired data includes a beat signal; the processing of the acquired data includes cross-correlation processing.

Optionally, the acquiring data of the test optical signal according to the trigger optical signal includes: and sampling the test optical signal at equal optical frequency intervals according to a clock formed by the trigger optical signal so as to eliminate the sweep frequency nonlinearity of the optical source.

Optionally, the first optical path module includes a main interferometer receiving portion, and the main interferometer receiving portion receives the optical signal by using a mixed polarization grading receiving manner;

the second optical path module comprises an auxiliary interferometer, and the auxiliary interferometer is used for generating a trigger optical signal and triggering the data acquisition module so as to eliminate the sweep frequency nonlinearity of the light source.

Optionally, the first optical path module includes a circulator, a second coupler, a third coupler, a polarization beam splitter Prism (PBS), a first photodiode, and a second photodiode, where an input optical signal from the first coupler passes through the second coupler and is then output to the circulator and the third coupler, respectively, a second end of the circulator is connected to an overhead cable, a third end of the circulator is connected to the third coupler, one end of the third coupler is connected to the PBS, the other end of the PBS is connected to both the first photodiode and the second photodiode, and the other ends of the first photodiode and the second photodiode are connected to the data acquisition module;

the second optical path module comprises a fourth coupler, a fifth coupler and a third photodiode, wherein an input optical signal from the first coupler is divided into two paths after passing through the fourth coupler, the two paths are respectively transmitted into the fifth coupler through different optical fibers, the other end of the fifth coupler is connected to the third photodiode, and the other end of the third photodiode is connected to the data acquisition module.

Optionally, the processing step of the data processing module includes:

a mapping step of mapping the acquired data from an optical frequency domain to a distance domain by Fast Fourier Transform (FFT);

a reflection step, dividing the overhead cable optical fiber into n sections by using a sliding window in a distance domain, and mapping the distance domain information corresponding to each section of optical fiber from the distance domain to an optical frequency domain by fast inverse Fourier transform (IFFT);

and a demodulation step, in an optical frequency domain, demodulating the Rayleigh scattering spectrum peak offset before and after the stress change of the overhead cable corresponding to each section of optical fiber by using a cross-correlation algorithm, and calculating the stress variation of the overhead cable corresponding to each section of optical fiber according to the offset so as to obtain the ice coating data of the overhead cable.

In a second aspect, an embodiment of the present invention further provides a laser ice melting system, including the ice coating monitoring device, further including a feedback device, a laser self-aiming device, a laser control device, and a laser; wherein the content of the first and second substances,

the feedback device is used for demodulating the monitoring data obtained by the icing monitoring device into icing thickness data and feeding the icing thickness data back to the laser control device;

the laser control device is used for controlling a laser to melt ice on the overhead cable according to the ice coating thickness data;

the laser self-aiming device is used for positioning and aiming the ice melting position on the overhead cable;

the laser is used for outputting laser and melting ice on the overhead cable.

Optionally, the controlling the laser to perform the ice melting operation on the overhead cable includes controlling at least one of start-up and shut-down of the laser, a beam size of the laser, a beam moving speed of the laser, and an output power of the laser.

In a third aspect, an embodiment of the present invention further provides an icing monitoring method, which is used for the aforementioned icing monitoring device, and is characterized in that the method includes:

a data acquisition step, under the same test condition, triggering and acquiring the test optical signal of the first optical path module according to the beat frequency signal of the trigger optical signal generated by the second optical path module to obtain reference data and test data, wherein the reference data and the test data are optical frequency domain signals;

a mapping step of mapping the reference data and the test data from an optical frequency domain to a distance domain by a Fast Fourier Transform (FFT);

a reflection step, dividing the overhead cable optical fiber into n sections by using a sliding window in a distance domain, and mapping the distance domain information corresponding to each section of optical fiber from the distance domain to an optical frequency domain by fast inverse Fourier transform (IFFT);

and a demodulation step, in an optical frequency domain, demodulating the Rayleigh scattering spectrum peak offset before and after the stress change of the overhead cable corresponding to each section of optical fiber by using a cross-correlation algorithm, and calculating the stress variation of the overhead cable corresponding to each section of optical fiber according to the offset so as to obtain the ice coating data of the overhead cable.

According to the embodiment provided by the invention, the ice coating condition on the overhead cable can be remotely monitored in real time by utilizing the optical fiber characteristics in the overhead cable, and when ice melting operation is required, the ice is remotely melted by utilizing the laser, so that the labor cost is greatly saved, and the ice removing efficiency is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a block diagram of an ice coating monitoring device according to an embodiment of the present invention;

FIG. 2 is a schematic flow chart of a method for monitoring ice coating according to another embodiment of the present invention;

FIG. 3 is a schematic diagram of a laser ice melting system according to an embodiment of the present invention;

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

It should be further noted that, for the convenience of description, only some but not all of the relevant aspects of the present invention are shown in the drawings. Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the operations (or steps) as a sequential process, many of the operations can be performed in parallel, concurrently or simultaneously. In addition, the order of the operations may be re-arranged. A process may be terminated when its operations are completed, but may have additional steps not included in the figure. A process may correspond to a method, a function, a procedure, a subroutine, a subprogram, etc.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

Optical frequency domain reflectometry, OFDR, is a high resolution fiber optic measurement technique developed gradually in the 1990's. Different from the optical time domain reflectometer OTDR which transmits a time domain pulse signal into the system, the OFDR transmits a frequency sweep optical signal into the system by utilizing a narrow-band laser and an acoustic optical modulator, and the detected signal is analyzed by a special algorithm through an optical heterodyne detection technology. The key technology of the OFDR system mainly includes a linear frequency-sweeping light source composed of a narrow-linewidth single longitudinal mode laser and an electro-optic modulator (usually an acousto-optic modulator), an MZ interferometer (including a light path composed of a coupler, a polarization controller and the like, the required light path is as short as possible), light path receiving (a balanced photoelectric detector), data acquisition and algorithm and the like.

Fig. 1 shows an architecture diagram of an OFDR-based icing monitoring device, which, as shown in fig. 1, comprises the following modules:

the light source module is used for generating tunable laser and outputting the tunable laser to the first light path module and the second light path module through the first coupler;

the light source module may be a tunable laser TLS, which may be a single longitudinal mode narrow linewidth tunable laser, and the tunable laser has a wide wavelength band tuning range from near ultraviolet to near infrared, and has a small size, a narrow linewidth, and high optical efficiency, as compared to other conventional solid-state lasers, where the size of the device itself may be greatly reduced. Of course, suitable types of lasers can be selected as needed, such as lasers based on current control techniques, temperature control techniques and mechanical control techniques, including SG-DBR (sampled grating DBR) and GCSR (assisted grating directional coupled back-sampled reflection) lasers, DFB (distributed feedback) and DBR (distributed bragg reflection) lasers, DFB (distributed feedback), ECL (external cavity laser) and VCSEL (vertical cavity surface emitting laser), etc.

The first optical path module is connected to the overhead cable through a circulator, and is used for receiving the optical signal generated by the light source module and outputting a test optical signal;

the overhead cable is preferably an overhead ground wire, and the interior of the cable contains optical fibers; the first optical path module can comprise a main interferometer, and when an input optical signal passes through the main interferometer, the input optical signal is subjected to frequency mixing on a detector to form a test signal; in the receiver part of the main interferometer, a frequency mixing type polarization grading receiving mode is adopted to eliminate the polarization fading phenomenon.

The second light path module is used for receiving the optical signal generated by the light source module and outputting a trigger optical signal;

the second optical path module may include an additional interferometer (or referred to as an auxiliary interferometer) that mixes on the photodetector to form a trigger signal, and the auxiliary interferometer is used to trigger the acquisition mode to eliminate the non-linearity of the frequency sweep of the light source.

Optionally, for example, the system triggers and collects the output signal of the main interferometer according to the sinusoidal signal output by the auxiliary interferometer, and meets the requirement of optical frequency interval sampling such as beat signal of the main interferometer, meanwhile, in order to meet the nyquist sampling theorem, the optical path difference of the auxiliary interferometer is at least four times of the optical fiber with the testing length,

the data acquisition module is used for carrying out data acquisition on the test optical signal according to the trigger optical signal;

the data acquisition module can be a data acquisition card, and performs equal optical frequency interval sampling on the test signal generated by the first optical path module according to a clock formed by the trigger signal generated by the second optical path module to eliminate the sweep frequency nonlinearity of the light source; the data acquisition card can acquire beat signals of the main interferometer according to TTL signals of the tunable laser and trigger signals of the auxiliary interferometer.

The data processing module is used for receiving the data acquired by the data acquisition module and processing the acquired data to obtain the icing thickness of the overhead cable;

the data processing module can be a PC (personal computer), a notebook computer, a tablet personal computer and the like, and can be used for performing cross-correlation processing and the like on the acquired data, drawing an overhead ground wire icing thickness variation graph and displaying the graph on a screen of a user, so that the user can visually see the icing condition and make a decision.

The light source module is further configured to output a TTL signal to the data acquisition module to control the data acquisition module to start and close, and may also control the data acquisition module to start and close in other manners, for example, the light source module may be manually controlled by a user on a PC side, or the data acquisition module may be started and stopped in a software manner.

The acquired data comprises a beat signal; the processing of the acquired data includes cross-correlation processing.

The data acquisition of the test optical signal according to the trigger optical signal comprises: and sampling the test optical signal at equal optical frequency intervals according to a clock formed by the trigger optical signal so as to eliminate the sweep frequency nonlinearity of the optical source.

The first optical path module comprises a main interferometer receiving part, and the main interferometer receiving part receives optical signals in a mixing type polarization grading receiving mode;

the second optical path module comprises an auxiliary interferometer, and the auxiliary interferometer is used for generating a trigger optical signal and triggering the data acquisition module so as to eliminate the sweep frequency nonlinearity of the light source.

Specifically, as shown in fig. 1, the first optical path module includes a circulator, a second coupler, a third coupler, a polarization beam splitter Prism (PBS), a first photodiode, and a second photodiode, wherein an input optical signal from the first coupler is output to the circulator and the third coupler after passing through the second coupler, respectively, a second end of the circulator is connected to an overhead cable, a third end of the circulator is connected to the third coupler, one end of the third coupler is connected to the PBS, the other end of the PBS is connected to both the first photodiode and the second photodiode, and the other ends of the first photodiode and the second photodiode are connected to the data acquisition module;

the second optical path module comprises a fourth coupler, a fifth coupler and a third photodiode, wherein an input optical signal from the first coupler is divided into two paths after passing through the fourth coupler, the two paths are respectively transmitted into the fifth coupler through different optical fibers, the other end of the fifth coupler is connected to the third photodiode, and the other end of the third photodiode is connected to the data acquisition module.

The processing steps of the data processing module comprise:

a mapping step of mapping the acquired data from an optical frequency domain to a distance domain by Fast Fourier Transform (FFT);

a reflection step, dividing the overhead cable optical fiber into n sections by using a sliding window in a distance domain, and mapping the distance domain information corresponding to each section of optical fiber from the distance domain to an optical frequency domain by fast inverse Fourier transform (IFFT);

and a demodulation step, in an optical frequency domain, demodulating the Rayleigh scattering spectrum peak offset before and after the stress change of the overhead cable corresponding to each section of optical fiber by using a cross-correlation algorithm, and calculating the stress variation of the overhead cable corresponding to each section of optical fiber according to the offset to obtain the ice coating data of the overhead cable so as to obtain the ice coating thickness of the overhead cable.

When the optical fiber (the optical fiber is arranged on the overhead line) is bent or stressed, the reflection (Rayleigh scattering) wavelength of the optical fiber per se changes, and the scheme monitors the stress condition borne by the optical fiber per se by utilizing the characteristic so as to determine the ice coating thickness data.

In fig. 1, the elliptical device is a coupler, the circular device is a circulator, an overhead ground wire is connected to the circulator, and the upper part of the optical path is a first optical path module which outputs a test signal to a data acquisition card; the lower part of the optical path is a second optical path module which outputs a trigger signal to the data acquisition card.

On the basis of the icing monitoring device shown in fig. 1, a user can remotely monitor icing data on a passive basis, and when the deicing operation is needed, the deicing operation is carried out, so that the deicing efficiency is greatly improved, the deicing cost is reduced, and a very good actual effect is achieved.

Fig. 2 is a schematic flow chart of an OFDR-based ice coating monitoring method according to another embodiment of the present invention, and as shown in fig. 2, the method includes the following steps:

a data acquisition step, under the same test condition, triggering and acquiring the test optical signal of the first optical path module according to the beat frequency signal of the trigger optical signal generated by the second optical path module to obtain reference data and test data, wherein the reference data and the test data are optical frequency domain signals;

the tunable laser needs to scan the front side and the rear side to determine the stress change condition of the overhead ground wire, the data acquisition process of the system after each scanning is completely the same, and the data acquisition card triggers and acquires the test signal of the main interferometer according to the beat frequency signal of the auxiliary interference;

a mapping step of mapping the reference data and the test data from an optical frequency domain to a distance domain by a Fast Fourier Transform (FFT);

wherein after the reference data and the test data are collected, the data processing software maps the data from the optical frequency domain (or time domain) to the distance domain (or frequency domain) by means of an FFT algorithm.

A reflection step, dividing the overhead cable optical fiber into n sections by using a sliding window in a distance domain, and mapping the distance domain information corresponding to each section of optical fiber from the distance domain to an optical frequency domain by fast inverse Fourier transform (IFFT);

the method comprises the steps of selecting distance domain information of a small section of overhead ground wire optical fiber in a distance domain by using a sliding window, and mapping the information of the distance domain to an optical frequency domain by an IFFT algorithm.

In the optical frequency domain, demodulating the Rayleigh scattering spectrum peak offset before and after the stress change of the overhead cable corresponding to each section of optical fiber by using a cross-correlation algorithm, and calculating the stress variation of the overhead cable corresponding to each section of optical fiber according to the offset so as to obtain the ice coating data of the overhead cable;

and finally, calculating the stress variation of the small section of overhead ground wire according to the peak offset.

The stress change of the overhead ground wire of each section on the optical fiber can be measured by repeating the process, and distributed optical fiber sensing is realized.

As can be seen from fig. 2, after the laser outputs a signal, reference data and test data of a time domain or a wavelength domain (optical frequency domain) are obtained through two scanning; obtaining reference data and test data of a frequency domain or a distance domain after fast Fourier transform, dividing the overhead ground wire optical fiber into a plurality of sections (for example, n sections) by using a sliding window, respectively processing data generated by each small section of optical fiber, summing squares of two obtained results after fast Fourier inverse transform, and obtaining stress change on the test overhead ground wire optical fiber through cross-correlation operation. And after repeated treatment, obtaining the ice coating condition data on the whole optical cable.

FIG. 3 shows a schematic diagram of a laser ice melting system according to another embodiment of the present invention. The laser ice melting system comprises the ice coating monitoring device, a feedback device, a laser self-aiming device, a laser control device and a laser; wherein the content of the first and second substances,

the feedback device is used for demodulating the monitoring data obtained by the icing monitoring device into icing thickness data and feeding the icing thickness data back to the laser control device;

the laser control device is used for controlling a laser to melt ice on the overhead cable according to the ice coating thickness data;

the laser self-aiming device is used for positioning and aiming the ice melting position on the overhead cable;

the laser is used for outputting laser and melting ice on the overhead cable.

The control of the laser to melt the ice on the overhead cable comprises controlling at least one of starting and stopping of the laser, the size of a laser beam, the moving speed of the laser beam and the output power of the laser.

In fig. 3, an OFDR system is an icing monitoring device of the scheme, firstly, the icing condition is detected by the icing monitoring device, when the icing thickness reaches a certain threshold, a laser self-aiming system is started, the ice melting position on an overhead cable is positioned and aimed, a laser is started to melt ice, in the ice melting process, the laser adjusts the ice melting speed of the laser according to the real-time icing feedback of the OFDR-based passive icing on-line monitoring system, so that the phenomena of fusing and the like of an overhead ground wire due to long-time laser irradiation can be avoided, and the moving speed, the spot size, the output power and the like of a laser beam are adjusted according to the real-time icing condition, so that the ice melting efficiency is improved. Generally speaking, the icing monitoring device can be located in a transformer substation, and an operator can observe icing data in real time through a display screen, so that the laser is controlled to melt ice.

The division of the modules in the above embodiments of the present invention is schematic, and only one logical function division is provided, and there may be another division manner in actual implementation, and in addition, each functional module in each embodiment of the present application may be integrated in one processor, may also exist alone physically, or may also be integrated in one module by two or more modules. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.

The electronic device of embodiments of the present invention exists in a variety of forms, including but not limited to:

(1) a mobile communication device: such devices are characterized by mobile communications capabilities and are primarily targeted at providing voice, data communications. Such terminals include: smart phones (e.g., iphones), multimedia phones, functional phones, and low-end phones, among others.

(2) Ultra mobile personal computer device: the equipment belongs to the category of personal computers, has calculation and processing functions and generally has the characteristic of mobile internet access. Such terminals include: PDA, MID, and UMPC devices, etc., such as ipads.

(3) A portable entertainment device: such devices can display and play multimedia content. This type of device comprises: audio, video players (e.g., ipods), handheld game consoles, electronic books, and smart toys and portable car navigation devices.

(4) A server: the device for providing computing service, the server comprises a processor 1010, a hard disk, a memory, a system bus and the like, the server is similar to a general computer architecture, but the server needs to provide highly reliable service, so the requirements on processing capability, stability, reliability, safety, expandability, manageability and the like are high.

(5) And other electronic devices with data interaction functions.

The above-described embodiments of the apparatus are merely illustrative, and the modules described as separate parts may or may not be physically separate, and the parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

Embodiments of the present invention provide a non-volatile computer-readable storage medium, where program instructions are stored, and when the program instructions are executed by an electronic device, the non-volatile computer-readable storage medium is configured to perform the panoramic video interaction method and steps in the foregoing method embodiments.

Embodiments of the present invention provide a computer program product, where the computer program product includes a computer program stored on a non-transitory computer readable storage medium, the computer program including program instructions, where the program instructions, when executed by an electronic device, cause the electronic device to perform the panoramic video interaction method in any of the above-mentioned method embodiments.

Each functional module in the embodiments of the present invention may be integrated into one processing unit, or each module may exist alone physically, or two or more modules are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) or an intelligent terminal device or a Processor (Processor) to execute some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

In the above embodiments provided by the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of modules is merely a division of logical functions, and an actual implementation may have another division, for example, a plurality of modules or components may be combined or integrated into another system, or some features may be omitted, or not executed.

Modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing detailed description, or equivalent changes may be made in some of the features of the embodiments. All equivalent structures made by using the contents of the specification and the attached drawings of the invention can be directly or indirectly applied to other related technical fields, and are also within the protection scope of the patent of the invention.