阅读说明：本技术 电压传感器及电压检测方法 (Voltage sensor and voltage detection method ) 是由 林剑涛 刘耀 李宗祥 于 2021-08-27 设计创作，主要内容包括：本发明实施例公开一种电压传感器及电压检测方法。在一具体实施方式中,该电压传感器包括：包括光源装置、第一光纤光栅、压电装置、光电探测器和数据处理器；所述第一光纤光栅的至少部分内包层为聚二甲基硅氧烷膜,所述聚二甲基硅氧烷膜与所述压电装置固定连接；所述光源装置,用于输出设定波长的窄带光至所述第一光纤光栅；所述压电装置,用于在待检测的电压信号的作用下产生拉伸所述聚二甲基硅氧烷膜的形变,以改变所述聚二甲基硅氧烷膜的折射率,从而改变所述第一光纤光栅的中心波长；所述数据处理器,用于根据所述光电探测器感测的经所述第一光纤光栅滤波后的所述窄带光的光强及预存的光强与电压值的对应关系,确定所述电压信号的电压值。(The embodiment of the invention discloses a voltage sensor and a voltage detection method. In one embodiment, the voltage sensor comprises: the device comprises a light source device, a first fiber bragg grating, a piezoelectric device, a photoelectric detector and a data processor; at least part of the inner cladding of the first fiber bragg grating is a polydimethylsiloxane film, and the polydimethylsiloxane film is fixedly connected with the piezoelectric device; the light source device is used for outputting narrow-band light with set wavelength to the first fiber grating; the piezoelectric device is used for stretching the polydimethylsiloxane membrane to deform under the action of a voltage signal to be detected so as to change the refractive index of the polydimethylsiloxane membrane and further change the central wavelength of the first fiber bragg grating; and the data processor is used for determining the voltage value of the voltage signal according to the light intensity of the narrow-band light which is sensed by the photoelectric detector and filtered by the first fiber bragg grating and the corresponding relation between the pre-stored light intensity and the voltage value.)

1. A voltage sensor is characterized by comprising a light source device, a first fiber bragg grating, a piezoelectric device, a photoelectric detector and a data processor; at least part of the inner cladding of the first fiber bragg grating is a polydimethylsiloxane film, and the polydimethylsiloxane film is fixedly connected with the piezoelectric device;

the light source device is used for outputting narrow-band light with set wavelength to the first fiber grating;

the piezoelectric device is used for stretching the polydimethylsiloxane membrane to deform under the action of a voltage signal to be detected so as to change the refractive index of the polydimethylsiloxane membrane and further change the central wavelength of the first fiber bragg grating;

and the data processor is used for determining the voltage value of the voltage signal according to the light intensity of the narrow-band light which is sensed by the photoelectric detector and filtered by the first fiber bragg grating and the corresponding relation between the pre-stored light intensity and the voltage value.

2. The voltage sensor of claim 1, wherein the first fiber grating is a long-period fiber grating.

3. The voltage sensor of claim 1, wherein the piezoelectric device is a piezoelectric ceramic.

4. The voltage sensor of claim 1, wherein the light source device comprises a broadband light source, an isolator, a circulator, and a second fiber grating;

the broadband light source is used for outputting broadband light;

the second fiber grating is used for reflecting the broadband light which sequentially passes through the isolator and the circulator into narrow-band light with set wavelength, and outputting the narrow-band light to the first fiber grating through the circulator.

5. The voltage sensor of claim 4, wherein the second fiber grating is a short-period fiber grating.

6. The voltage sensor of claim 1, wherein the thickness of the polydimethylsiloxane membrane ranges from 50 μ ι η to 100 μ ι η.

7. The voltage sensor according to claim 1, wherein the polydimethylsiloxane membrane has a length along the axial direction of the first fiber grating in a range of 5mm to 10 mm.

8. The voltage sensor according to claim 1, further comprising a storage device storing a look-up table containing the correspondence of the light intensity to the voltage value.

9. A voltage detection method based on the voltage sensor according to any one of claims 1 to 8, comprising:

outputting narrow-band light with a set wavelength by using the light source device;

connecting a voltage signal to be detected to the piezoelectric device, so that the piezoelectric device stretches the polydimethylsiloxane membrane to deform under the action of the voltage signal to be detected, so as to change the refractive index of the polydimethylsiloxane membrane, and further change the central wavelength of the first fiber bragg grating;

and determining the voltage value of the voltage signal by using the data processor according to the light intensity of the narrow-band light filtered by the first fiber bragg grating sensed by the photoelectric detector and the corresponding relation between the pre-stored light intensity and the voltage value.

10. The method of claim 9, wherein prior to said coupling the voltage signal to be detected to the piezoelectric device, the method further comprises:

when the light source device is used for outputting narrow-band light with set wavelength, a plurality of voltage signals with known voltage values are respectively connected to the piezoelectric device, and the light intensity of the narrow-band light which is sensed by the photoelectric detector and filtered by the first fiber bragg grating is recorded when a voltage signal with a known voltage value is connected each time, so that the corresponding relation between the light intensity and the voltage value is obtained and stored.

Technical Field

The invention relates to the technical field of voltage sensing. And more particularly, to a voltage sensor and a voltage detection method.

Background

At present, a voltage sensor is composed of circuit components, and the circuit components are easy to damage and influence testing under the conditions of strong electromagnetic interference and high voltage.

Disclosure of Invention

The present invention is directed to a voltage sensor and a voltage detecting method for solving at least one of the problems of the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention provides a voltage sensor in a first aspect, which comprises a light source device, a first fiber grating, a piezoelectric device, a photoelectric detector and a data processor, wherein the first fiber grating is arranged on the light source device; at least part of the inner cladding of the first fiber bragg grating is a polydimethylsiloxane film, and the polydimethylsiloxane film is fixedly connected with the piezoelectric device;

the light source device is used for outputting narrow-band light with set wavelength to the first fiber grating;

the piezoelectric device is used for stretching the polydimethylsiloxane membrane to deform under the action of a voltage signal to be detected so as to change the refractive index of the polydimethylsiloxane membrane and further change the central wavelength of the first fiber bragg grating;

and the data processor is used for determining the voltage value of the voltage signal according to the light intensity of the narrow-band light which is sensed by the photoelectric detector and filtered by the first fiber bragg grating and the corresponding relation between the pre-stored light intensity and the voltage value.

Optionally, the first fiber grating is a long-period fiber grating.

Optionally, the piezoelectric device is a piezoelectric ceramic.

Optionally, the light source device includes a broadband light source, an isolator, a circulator and a second fiber grating;

the broadband light source is used for outputting broadband light;

the second fiber grating is used for reflecting the broadband light which sequentially passes through the isolator and the circulator into narrow-band light with set wavelength, and outputting the narrow-band light to the first fiber grating through the circulator.

Optionally, the second fiber grating is a short-period fiber grating.

Optionally, the thickness of the polydimethylsiloxane membrane ranges from 50 μm to 100 μm.

Optionally, the length of the polydimethylsiloxane membrane along the axial direction of the first fiber grating ranges from 5mm to 10 mm.

Optionally, the voltage sensor further comprises a storage device storing a lookup table containing the correspondence between the light intensity and the voltage value.

A second aspect of the present invention provides a voltage detection method, including:

outputting narrow-band light with a set wavelength by using the light source device;

connecting a voltage signal to be detected to the piezoelectric device, so that the piezoelectric device stretches the polydimethylsiloxane membrane to deform under the action of the voltage signal to be detected, so as to change the refractive index of the polydimethylsiloxane membrane, and further change the central wavelength of the first fiber bragg grating;

and determining the voltage value of the voltage signal by using the data processor according to the light intensity of the narrow-band light filtered by the first fiber bragg grating sensed by the photoelectric detector and the corresponding relation between the pre-stored light intensity and the voltage value.

Optionally, before the connecting the voltage signal to be detected to the piezoelectric device, the method further includes:

when the light source device is used for outputting narrow-band light with set wavelength, a plurality of voltage signals with known voltage values are respectively connected to the piezoelectric device, and the light intensity of the narrow-band light which is sensed by the photoelectric detector and filtered by the first fiber bragg grating is recorded when a voltage signal with a known voltage value is connected each time, so that the corresponding relation between the light intensity and the voltage value is obtained and stored.

The invention has the following beneficial effects:

the invention combines the dimethyl silicone polymer film and the optical fiber sensing technology, adjusts the stretching degree of the dimethyl silicone polymer film by controlling the voltage at two ends of the dimethyl silicone polymer film, thereby changing the light intensity of the light wave passing through the optical fiber grating, realizing the optical fiber sensing design of intensity modulation type, having the advantages of low cost, high sensitivity, strong reliability and the like, and realizing the detection of direct current and alternating current micro-voltage.

Drawings

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

FIG. 1 shows a voltage sensor architecture diagram of one embodiment of the present invention.

Fig. 2 shows a waveform variation of light waves according to an embodiment of the present invention.

FIG. 3 shows a flow diagram of a voltage detection method of an embodiment of the invention.

Detailed Description

In order to more clearly illustrate the present invention, the present invention will be further described with reference to the following examples and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.

In the following, the terms "first", "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless otherwise specified.

In the embodiments of the present invention, words such as "exemplary" or "for example" are used to mean serving as examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "e.g.," an embodiment of the present invention is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

The fiber grating sensor is a full-optical transmission sensor, and changes the grid through the changes of conditions such as external temperature, strain, tension and the like, so that the central wavelength is changed, and the external change value is obtained through measuring the change quantity of the central wavelength. The fiber grating sensor belongs to a wavelength modulation type nonlinear optical fiber sensor, and detects by measuring the wavelength change of reflected light through the wavelength of a modulation incident beam to be measured.

Piezoelectric ceramics are a commonly used piezoelectric device. Piezoelectric ceramics are artificially synthesized multi-body piezoelectric materials, which are composed of numerous fine electric domains. The electric domains are small areas of spontaneous polarization in fact, the directions of the spontaneous polarization are completely randomly arranged, and the polarization effects of the electric domains are mutually counteracted without the action of an external electric field, so that the piezoelectric effect is avoided; the piezoelectric effect is only achieved after the polarization treatment. Under the action of a certain temperature and a strong electric field (such as a 20-30 KV/cm direct current electric field), the spontaneous polarization direction of the internal electric domain tends to the direction of a dry electric field, and the piezoelectric ceramic after polarization treatment has a certain polarization strength. After the external electric field is removed, the spontaneous polarization of each electric domain is oriented to a certain extent according to the original direction of the external electric field, and strong residual polarization intensity still exists in the spontaneous polarization of each electric domain, so that bound charges (one end is positive charge, and the other end is negative charge) appear at two polarized ends of the piezoelectric ceramic, and free charges can be adsorbed on the surface of the electrode of the piezoelectric ceramic under the action of the bound charges. These free charges are opposite in sign and equal in value to the bound charges in the piezoelectric ceramic.

When the piezoelectric ceramic is subjected to the action of external force parallel to the polarization direction to generate compression deformation, electric domains deflect, the distance between the internal positive bound charges and the internal negative bound charges becomes smaller, and the residual polarization strength also becomes smaller, so that a part of the originally adsorbed free charges is released to generate a discharge phenomenon. When the external force is removed, the piezoelectric ceramic is recovered, the distance between the internal positive and negative bound charges is increased, the polarization strength is also increased, and a part of free charges are adsorbed on the electrode to generate a charging phenomenon. The magnitude of the charge and discharge is proportional to the magnitude of the external force, and the phenomenon of converting mechanical energy into electrical energy is called the piezoelectric effect of piezoelectric ceramics. Similarly, piezoelectric ceramics also have an inverse piezoelectric effect, i.e., an effect of converting electrical energy into mechanical energy.

The piezoelectric ceramic has the characteristics of large piezoelectric constant and high sensitivity; the piezoelectric ceramic can be made into piezoelectric elements with various shapes according to different stress and deformation forms, the piezoelectric elements are commonly in a sheet shape and a tubular shape, and the polarization direction of the tubular piezoelectric element can be in an axial direction or a circular ring radial direction.

In view of the above, as shown in fig. 1, an embodiment of the present invention provides a voltage sensor 100, which includes a light source device 110, a first fiber grating 120, a piezoelectric device 130, a photodetector 140, and a data processor 150, as can be seen from the enlarged schematic diagram of the first fiber grating 120 in fig. 1, at least a portion of an inner cladding of the first fiber grating 120 is a polydimethylsiloxane film 121, and the polydimethylsiloxane film 121 is fixedly connected to the piezoelectric device 130;

the light source device 110 is configured to output narrow-band light with a set wavelength to the first fiber grating 120;

the piezoelectric device 130 is configured to stretch the polydimethylsiloxane film 121 under the action of a voltage signal to be detected to change the refractive index of the polydimethylsiloxane film 121, so as to change the central wavelength of the first fiber grating 120, where it should be noted that the change of the central wavelength causes a change of light intensity sensed by the photodetector 140.

The data processor 150 is configured to determine a voltage value of the voltage signal according to the light intensity of the narrow-band light filtered by the first fiber grating 120 and a corresponding relationship between a pre-stored light intensity and a voltage value, which are sensed by the photodetector 140.

In this embodiment, the set wavelength of the narrow-band light output from the light source device 110 is based on the initial center wavelength λ of the first fiber grating 120₀And (4) determining. Because if the wavelength lambda is set₁With the initial central wavelength lambda₀Much phase difference even if the center wavelength lambda exists₀Although the shift occurs, the center wavelength λ after the shift cannot occur due to a large wavelength difference between the two₀And is provided withFixed wavelength lambda₁Equality phenomena, i.e. λ₀＝λ₁Therefore, the photodetector 140 cannot detect the minimum light intensity, and the data processor 150 cannot obtain the detection voltage corresponding to the minimum light intensity.

To avoid this, in one particular example, a narrow band optical wavelength λ₁Is approximately equal to the initial center wavelength λ of the first fiber grating 120₀The numerical value of (c). Illustratively, the initial center wavelength λ is based on the first fiber grating 120₀Setting a λ corresponding to the initial value₀Narrow-band optical wavelengths lambda that are not too far apart₁The narrow band optical wavelength λ₁I.e., the set wavelength of the narrow-band light output by the light source device 110. In one specific example, the initial center wavelength λ of the first fiber grating 120₀Can be 150nm according to the central wavelength lambda₀Set wavelength λ of set narrow band light₁Can be selected between 150 +/-50 nm, and the bandwidth range of narrow-band light is 150 nm.

In the embodiment, the set wavelength output by the light source device is determined according to the central wavelength of the first fiber bragg grating, so that the light intensity change can be detected quickly and accurately, and the detection precision of voltage data obtained by detection is ensured.

Polydimethylsiloxane (PDMS) is an organic material, and a PDMS film formed by mixing a rectangular transparent PDMS stack sheet with a solution containing small black dye particles has the advantages of small elastic modulus and large deformation degree compared with a conventional inner cladding (such as a silicon dioxide film) of a fiber grating, and can ensure the accuracy and sensitivity of voltage detection.

In the embodiment of the present invention, as shown in fig. 1, a polydimethylsiloxane film (PDMS film) 121 is coated on the outer side of the first fiber grating 120, and when the PDMS film 121 deforms, the refractive index of the PDMS film changes, and different deformation degrees correspond to different refractive indexes, and the refractive index change of the PDMS film causes a central wavelength shift of the fiber grating, so as to further ensure accuracy and sensitivity of voltage detection.

In one possible implementation, the first fiber grating 120 is a long-period fiber grating.

The center wavelength of the first fiber grating 120 may be referred to as a threshold wavelength, e.g., a center wavelength λ₀The long-period fiber grating functions as a central wavelength lambda₀A transmission type band elimination filter of (1). The central wavelength change changes the intensity of the narrow band light filtered by the long period fiber grating.

For example, the filtering principle of the PDMS film-coated long-period fiber grating of this embodiment is as follows:

when the effect of the voltage signal who detects is in piezoelectric device 130, piezoelectric device 130 takes place deformation, make and then drive the polydimethylsiloxane membrane 121 together fixed, make PDMS membrane 121 take place tensile, because PDMS membrane 121 is as the surrounding layer of first fiber grating 120, when PDMS membrane 121 takes place deformation, PDMS membrane 121's transmissivity can grow, originally, the light wave that carries out the total emission propagation at fibre core 122 can reveal out and lead the intensity decay of light wave this moment, at this moment, just can detect the decay degree of light intensity through external photoelectric detector 140, and then according to the light intensity of narrow band light and the corresponding relation of the light intensity of prestoring and voltage value can calculate the situation of change of voltage. In one particular example, the present example can detect a voltage signal through a voltage test probe.

The above process combines the optical characteristics of the PDMS film and the optical fiber sensing technology to detect the voltage signal, can detect the change of the voltage signal in real time, can detect the ultra-low voltage, and has the characteristics of high detection speed, high detection precision and wide application range.

In one possible implementation, the thickness of the polydimethylsiloxane membrane ranges from 50 μm to 100 μm.

In a possible implementation manner, the length of the polydimethylsiloxane membrane along the axial direction of the first fiber grating 120 ranges from 5mm to 10 mm.

In a specific example, the long-period fiber grating is processed by first dissolving a portion of the inner cladding 124 of the coated core 122 (the core may be made of high-purity silicon with a high refractive index, and the core has a grating 123) of the long-period fiber grating with the coating removed by using a chemical etching solution, such as an HF acid solution, the dissolved length is controlled to be 5-10mm, and then the PDMS film 121 is coated on the exposed core after cleaning, wherein the thickness of the PDMS film 121 is 50-100 μm. The long-period fiber grating of the embodiment has the advantages of simple manufacturing process and lower manufacturing cost.

In one possible implementation, the piezoelectric device 130 is a piezoelectric ceramic. As shown in fig. 1, the piezoelectric device is externally connected with a piezoelectric test probe 160 at both ends, and voltage detection is performed by the piezoelectric test probe 160, so that the piezoelectric device 130 generates deformation, and the central wavelength of the first fiber grating is further changed. Furthermore, the embodiment of the invention can realize the detection of direct current and alternating micro-voltage by utilizing the electrical characteristics of the piezoelectric ceramics, and has stronger applicability.

As shown in fig. 1, the deformation generated by the piezoelectric ceramic is to stretch the PDMS film in the radial direction (i.e., diameter direction) of the first fiber grating 120, which may also be referred to as transverse stretching.

In one possible implementation, the light source device 110 includes a broadband light source 111, an isolator 112, a circulator 113, and a second fiber grating 114;

the broadband light source 111 is used for outputting broadband light; the broad spectrum light source 111 may be an LED light source in one example.

The second fiber grating 114 is configured to reflect the broadband light that sequentially passes through the isolator 112 and the circulator 113 into narrowband light with a set wavelength, and output the narrowband light to the first fiber grating 120 through the circulator 113, where the isolator 112 is configured to isolate the narrowband light reflected from the second fiber grating 114 in the optical path, so as to avoid the reflected light from entering the light source 111 and damaging the light source 111, and the circulator 113 is configured to change the optical path.

In one possible implementation, the second fiber grating 114 is a short-period fiber grating, and the short-period fiber grating belongs to a reflective band-pass filter.

Because it is difficult to directly manufacture the narrow-band light source, the embodiment of the invention uses the wide-spectrum light source 111, the isolator 112, the circulator 113 and the short-period fiber grating 114 to realize the narrow-band light source, thereby reducing the manufacturing difficulty and the manufacturing cost.

The embodiment adopts the optical path structure of the double fiber bragg gratings (namely the short-period fiber bragg grating and the long-period fiber bragg grating are combined and matched), the voltage change is detected by detecting the light intensity change, and compared with the fiber voltage sensor adopting other modulation principles such as phase, wavelength and polarization, the fiber voltage sensor has the advantages of lower signal demodulation cost and simpler structural design.

In one specific example, the broad spectrum light source 111 emits broadband light, the waveform diagram is shown in a diagram a in fig. 2, the broadband light reaches the short period fiber grating 114 through the isolator 112 and the circulator 113, and a beam with a wavelength λ is reflected back due to the coupling principle of the short period fiber grating 114₁The waveform of the narrow-band light is shown as a graph b in fig. 2; wavelength of λ₁The narrow-band light passes through the circulator 113 again to the long-period fiber grating 120, and the long-period fiber grating 120 has a filtering function and a central wavelength λ₀(corresponding to a central wavelength of λ)₀Transmission type band elimination filter) as shown in fig. 2 c, the hatched area indicates the magnitude of the light intensity of the light transmitted through the grating when the wavelength is λ₁The narrow-band light waveform and the central wavelength are lambda₀When the filtering waveform region is overlapped partially, the overlapped part is filtered, and the shadow part light wave smoothly passes through the long-period fiber grating and is detected by the photoelectric detector 140; when λ is shown as graph d in FIG. 2₁＝λ₀When the light intensity is detected, the overlapping area is maximized, and the detected light intensity is minimized; as shown in graph e of fig. 2, when the wavelength is λ₁The narrow-band light waveform and the central wavelength are lambda₀When the overlapping area of the filter waveform region is zero, the wavelength is λ₁The narrow-band light waves are all transmitted, and the detected light intensity is maximum.

In a possible implementation manner, the voltage sensor further includes a storage device storing a lookup table containing the correspondence between the light intensity and the voltage value. And calibrating a lookup table of the corresponding relation between the light intensity and the voltage value in advance. For example, a predetermined voltage value is applied from zero at a fixed interval of 0.1v, the light intensity corresponding to each voltage value within 5v is recorded and stored in a corresponding relationship lookup table of the light intensity and the voltage value; in use, the voltage value may be obtained, illustratively, by looking up a table directly from the sensed light intensity. The calibration parameters such as the voltage range and the distance are set according to the requirements such as the accuracy requirement of voltage detection, and the like, which is not limited in the present invention.

The embodiment combines the polydimethylsiloxane membrane and the optical fiber sensing technology, adjusts the stretching degree of the polydimethylsiloxane membrane by controlling the voltage at two ends of the polydimethylsiloxane membrane, thereby changing the light intensity of light waves passing through the fiber bragg grating, realizing the intensity-modulated optical fiber sensing design, having the advantages of low cost, high sensitivity, strong reliability and the like, and being capable of realizing the detection of direct current and alternating current micro-voltage.

The voltage sensor provided by the embodiment has the detection advantage of ultra-low voltage, and has great development potential in the technical fields of wearable equipment, medical electrocardio monitoring platforms, electrical detection equipment and the like.

Another embodiment of the present invention provides a voltage detecting method, where before voltage detection, a corresponding relationship between light intensity and voltage value needs to be calibrated in advance and stored in a lookup table of the corresponding relationship between light intensity and voltage value.

The method for calibrating the corresponding relation between the light intensity and the voltage value in advance comprises the following steps:

when the light source device is used for outputting narrow-band light with set wavelength, a plurality of voltage signals with known voltage values are respectively connected to the piezoelectric device, and the light intensity of the narrow-band light which is sensed by the photoelectric detector and filtered by the first fiber bragg grating is recorded when a voltage signal with a known voltage value is connected each time, so that the corresponding relation between the light intensity and the voltage value is obtained and stored. The wavelength of the narrow-band light output by the light source device is fixed, and the pre-calibration stage and the voltage detection stage are consistent, so that calibration is effective.

For example, a predetermined voltage value is applied from zero at a fixed interval of 0.1v, the light intensity corresponding to each voltage value within 5v is recorded and stored in a corresponding relationship lookup table of the light intensity and the voltage value; when the device is used, the voltage value can be obtained by looking up the table directly according to the sensed light intensity.

Calibration parameters such as a voltage range and a distance are set according to requirements such as a precision requirement of voltage detection, which is not limited in this embodiment.

As shown in fig. 3, the voltage detection method provided in this embodiment includes the following steps:

and S1, outputting narrow-band light with set wavelength by the light source device. The set wavelength is matched with the wavelength of the narrow-band light output by the light source device in the pre-calibration.

And S2, connecting a voltage signal to be detected to the piezoelectric device, so that the piezoelectric device generates deformation for stretching the polydimethylsiloxane film under the action of the voltage signal to be detected, and the refractive index of the polydimethylsiloxane film is changed, thereby changing the central wavelength of the first fiber bragg grating.

And S3, determining the voltage value of the voltage signal by using the data processor according to the light intensity of the narrow-band light which is sensed by the photoelectric detector and filtered by the first fiber bragg grating and the corresponding relation between the pre-stored light intensity and the voltage value.

The embodiment combines the polydimethylsiloxane membrane and the optical fiber sensing technology, adjusts the stretching degree of the polydimethylsiloxane membrane by controlling the voltage at two ends of the polydimethylsiloxane membrane, thereby changing the light intensity of light waves passing through the fiber bragg grating and realizing the intensity-modulated optical fiber sensing design.

The embodiment can be applied to the technical fields of wearable equipment, medical monitoring platforms, electrical detection equipment and the like.

It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations and modifications can be made on the basis of the above description, and all embodiments cannot be exhaustive, and all obvious variations and modifications belonging to the technical scheme of the present invention are within the protection scope of the present invention.