阅读说明：本技术 转镜分幅相机时序诊断的光强时标探测器及其标定方法 (Light intensity time scale detector for time sequence diagnosis of rotating mirror framing camera and calibration method thereof ) 是由 杨振伟 金山 刘明涛 但加坤 文雪峰 向艳军 陈永涛 于 2021-03-04 设计创作，主要内容包括：本发明公开了转镜分幅相机时序诊断的光强时标探测器,包括：光探头,光探头的数量为两个,两个光探头均安装于转镜分幅相机的排透镜上方且分别对应不同的两幅照片,用于采集光强并测量安装位置对应的照片拍照时刻；光强探测器用于接收光探头采集到的光强信号；光电转换模块用于将光强探测器采集到的光强信号转换为电信号；时序检测系统包括示波器和采集控制模块,示波器用于接收光电转换模块转换的电信号并显示光强随时间变化的波形,采集控制模块用于采集示波器中的信号并处理,读出波形数据并分析时间。本发明还公开了上述光强时标探测器的标定方法。本发明可实现实验前拍照时序的快速调试,实验时拍照时刻的监测以及被拍摄物光强度变化诊断。(The invention discloses a light intensity time scale detector for time sequence diagnosis of a rotating mirror framing camera, which comprises: the optical probes are arranged above the row lens of the rotating mirror framing camera and respectively correspond to two different pictures and are used for acquiring light intensity and measuring the picture photographing time corresponding to the installation position; the light intensity detector is used for receiving the light intensity signal collected by the light probe; the photoelectric conversion module is used for converting the light intensity signal acquired by the light intensity detector into an electric signal; the time sequence detection system comprises an oscilloscope and an acquisition control module, wherein the oscilloscope is used for receiving the electric signals converted by the photoelectric conversion module and displaying the waveform of the light intensity along with the time change, and the acquisition control module is used for acquiring and processing the signals in the oscilloscope, reading waveform data and analyzing the time. The invention also discloses a calibration method of the light intensity time scale detector. The invention can realize the rapid debugging of the photographing time sequence before the experiment, the monitoring of the photographing time during the experiment and the diagnosis of the light intensity change of the photographed object.)

1. The diagnostic light intensity time scale detector of rotating mirror framing camera chronogenesis, its characterized in that includes:

the optical probes are arranged above the row of lenses of the rotating mirror framing camera and respectively correspond to two different pictures, and are used for acquiring light intensity and measuring the picture photographing time corresponding to the installation position;

the light intensity detector is used for receiving the light intensity signal collected by the light probe;

the photoelectric conversion module is used for converting the light intensity signal acquired by the light intensity detector into an electric signal;

the time sequence detection system comprises an oscilloscope and an acquisition control module, wherein the oscilloscope is used for receiving the electric signals converted by the photoelectric conversion module and displaying the waveform of the light intensity along with the time change, and the acquisition control module is used for acquiring and processing the signals in the oscilloscope, reading waveform data and analyzing the time.

2. The light intensity time scale detector for time sequence diagnosis of the rotating mirror framing camera according to claim 1, further comprising an illumination system having a pulse high voltage power supply and a xenon lamp connected to the pulse high voltage power supply, wherein the pulse high voltage power supply is used for generating a negative high voltage pulse signal to trigger the xenon lamp.

3. The light intensity time scale detector for time series diagnosis of a rotating mirror framing camera of claim 2, wherein the illumination system further comprises:

the high-voltage transmission cable is used for connecting the pulse high-voltage power supply with the xenon lamp;

the xenon lamp high-voltage power supply is used for charging high voltage for the xenon lamp;

and the time delay module is used for controlling the xenon lamp triggering time.

4. The light intensity time scale detector for time sequence diagnosis of the rotating mirror framing camera according to claim 2, wherein filters are arranged at the oscilloscope end of the time sequence detection system and between the pulse high-voltage power supply and the xenon lamp, and the filters are used for filtering electric signal interference generated by the high voltage of the detonating device and the high voltage of the xenon lamp.

5. The light intensity time scale detector for time series diagnosis of the rotating mirror framing camera of claim 1, wherein the two light probes are respectively installed at the first and last picture positions of the rotating mirror framing camera.

6. The light intensity time scale detector for time-series diagnosis of a rotating mirror framing camera of claim 1, wherein the photoelectric conversion module employs a silicon photomultiplier or a silicon avalanche diode.

7. The light intensity time scale detector for time sequence diagnosis of the rotating mirror framing camera according to claim 1, further comprising a condensing lens, a transmission optical fiber and a connecting flange, wherein the condensing lens is used for collecting the light intensity at the position of the light probe, the light intensity detector and the photoelectric conversion module are connected through the transmission optical fiber, the transmission optical fiber is used for transmitting the light signal collected by the light probe, and the connecting flange is used for connecting the inner optical fiber and the outer optical fiber of the light intensity detector.

8. The light intensity time scale calibration method for the time sequence diagnosis of the rotating mirror framing camera is characterized by comprising the following steps of:

step 1: after the system is built, performing state self-check on the system;

step 2: the method comprises the steps that a rotating mirror framing camera is started, when the rotating mirror framing camera reaches the rotation speed set by calculation, the rotating mirror framing camera triggers a delay synchronous machine after the delay of T0 through a fixed cable, the delay synchronous machine outputs two paths of signals, one path of signals triggers a detonating device, the detonating device can simultaneously output a synchronous trigger signal T1, and the other path of signals outputs a trigger illumination signal T2;

and step 3: the T1 signal triggers the light intensity time scale time sequence detection system after the transmission cable fixed time delay T3, and meanwhile, the light intensity time scale light probe enters the light intensity detector after the light intensity time scale light probe passes through the fixed cable time delay T4 from the inside of the rotating mirror framing camera;

and 4, step 4: the light intensity detector is converted into an electric signal after passing through the photoelectric conversion module, and then is recorded by the oscilloscope after being delayed by T5 through the fixed cable, and the oscilloscope can display the corresponding electric signal of light intensity change;

and 5: reading out the time difference T6 at the same amplitude of the light intensity time scale signal and the T2 signal through the waveform displayed by the oscilloscope;

step 6: calculating the photographing time of the first picture: Δ T1 ═ T6+ (T3-T4-T5);

and 7: if the probe is placed at the position of the last picture, the shooting time delta T2 of the last picture can be calculated, so that the shooting time interval of each picture can be calculated to be (delta T2-delta T1)/N, wherein N is the number of pictures shot by the rotating mirror framing camera;

and 8: and sequentially calculating the photographing time of each photo according to the calculated photographing time interval of each photo.

9. The method for calibrating the light intensity time scale for the time sequence diagnosis of the rotating mirror framing camera according to claim 8, wherein the self-checking of the state of the system in the step 1 comprises a light path part and a circuit part, wherein the main checking means of the light path part is to introduce red light to check whether a light path and a light probe are intact or not and whether the light intensity time scale meets the experimental requirements or not;

the circuit part adopts the optical probe to collect a standard optical signal, if the waveform time and the amplitude displayed in the oscilloscope are correct, the oscilloscope is considered to be normal, and when the oscilloscope is abnormal, the time and the amplitude do not correspond or the oscilloscope has no waveform.

Technical Field

The invention relates to the technical field of optical transient test, in particular to a light intensity time scale detector for time sequence diagnosis of a rotating mirror framing camera and a calibration method thereof.

Background

The high-speed framing photographic technology is an important experimental diagnosis technology for researching high-speed dynamic physical phenomena and has important application value in scientific research. The rotating mirror type framing high-speed photography technology is widely applied to multiple subject fields of explosion mechanics, fracture mechanics, impact dynamics and the like due to a series of advantages of high time resolution, high imaging space resolution, large film light receiving intensity range and the like, and is one of main means for researching microsecond/ten microsecond magnitude dynamic physical processes.

The rotating mirror type framing high-speed photography technology adopts the characteristic of a mechanical structure, the drift amount of the photographing time is large, so that the imaging time of each image needs to be determined by other methods, and the photographing time needs to be roughly adjusted before an experiment. The traditional determination method is a time standard detonator method, namely a detonator is placed in a photographing area, the image is shot and the explosion process of the detonator is synchronously recorded, the time for starting the action of the detonator is known, so that the imaging time of the first motion image of the time standard detonator can be determined, and the imaging time of each image can be determined by combining the frame interval of a rotary mirror type high-speed camera.

However, the time scale detonator method has some obvious disadvantages: firstly, the time precision is low, the time precision of the interpretation of the time scale detonator method is equivalent to the amplitude interval of high-speed photography, the uncertainty is large, and the requirement of a precise physical experiment cannot be met; secondly, the danger coefficient is high, the time scale detonator is detonated by a high-voltage electric signal, certain potential safety hazards exist, and a common laboratory does not have related safety guarantee conditions; thirdly, the economy is not enough, the price of the time scale detonator is expensive, and the time scale detonator is a consumable in the experiment, so the experiment cost is obviously improved; and fourthly, the debugging consumes much time, the false detonator is required to be combined with the negative plate to carry out coarse timing adjustment in the debugging process, the phase washing process wastes time and labor, and the experiment efficiency is low. Chinese patent publication No. CN 104793457 a discloses an invention patent application entitled "method for calibrating laser timing mark signals for high-speed photography of a rotating mirror type framing camera" on 22.7.2015, which uses a laser timing mark signal generator to trigger and modulate pulse signal light generated by laser to form pulse signals with any waveform intensity variation characteristics, thereby meeting different timing mark signal requirements of various calibration methods, and increasing the calibration accuracy of the timing mark signals from T to 0.1T by reading the initial and missing amplitudes of the pulse signals on a film and formula operation, and increasing the calibration accuracy by 10 times. However, the signal source of the laser time scale system is in a shot object field, namely an object space, and the laser time scale system cannot be reused at one time, and the terminal signal solution of the laser time scale system still uses the negative film, so that the acquisition effect is greatly influenced by the final effect of the negative film, and the accurate judgment of the signal is also large.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a light intensity time scale detector for time sequence diagnosis of a rotating mirror framing camera, which can realize quick debugging of a photographing time sequence before an experiment, monitoring of photographing time during the experiment and diagnosis of light intensity change of a photographed object.

The invention is realized by the following technical scheme:

a light intensity time scale detector for time sequence diagnosis of a rotating mirror framing camera comprises: the optical probes are arranged above the row of lenses of the rotating mirror framing camera and respectively correspond to two different pictures, and are used for acquiring light intensity and measuring the picture photographing time corresponding to the installation position; the light intensity detector is used for receiving the light intensity signal collected by the light probe; the photoelectric conversion module is used for converting the light intensity signal acquired by the light intensity detector into an electric signal; the time sequence detection system comprises an oscilloscope and an acquisition control module, wherein the oscilloscope is used for receiving the electric signals converted by the photoelectric conversion module and displaying the waveform of the light intensity along with the time change, and the acquisition control module is used for acquiring and processing the signals in the oscilloscope, reading waveform data and analyzing the time.

At present, when a rotating mirror type framing high-speed photography technology is used for researching a high-speed dynamic physical phenomenon, in the prior art, a laser time scale signal generator triggers and modulates pulse signal light generated by laser, so that a pulse signal with any waveform intensity change characteristic can be formed, the requirements of different time scale signals of various calibration methods are met, the calibration precision of the time scale signal is improved from T to 0.1T by reading the initial and missing amplitude of the pulse signal on a negative film and formula operation, and the calibration precision is improved by 10 times. However, the signal source of the laser time scale system in the prior art is the shot object field, namely the object space, which cannot be reused at one time, and the terminal signal solution of the laser time scale system still uses the negative film, so that the acquisition effect is greatly influenced by the final effect of the negative film, and the accurate signal judgment is also large. The optical probe is respectively arranged on the photos of the rotating mirror framing camera, the rotating mirror framing camera can shoot a plurality of photos together, the position of the negative film of each photo in the camera is fixed, but the time interval for shooting each photo can be set, so the optical probe can be randomly placed on any two photos for measuring the shooting time of any one photo, when the shutter of the rotating mirror framing camera is opened to start exposure, the optical probe acquires the light intensity when the scanning light of the prism of the self mechanical structure of the rotating mirror framing camera appears in the previous photo and the next photo, and finally the waveform of the light intensity changing along with the time is displayed on the terminal detection equipment through the light intensity time scale detector to analyze the molding time of the previous photo and the next photo of the rotating mirror framing camera, because the rotating speed of the rotating mirror framing camera is uniform in one rotating period, therefore, the imaging time of each image can be obtained by utilizing the linear difference value of the imaging time of the previous image and the imaging time of the next image; the technical scheme includes that the light intensity signal in the technical scheme is directly recorded by the oscilloscope and can be synchronously associated with a relevant overall time reference signal in an experiment, and the whole of the signal of the rotating mirror framing camera and an experiment test signal are accurately associated for the first time.

Compared with the laser time scale adopted in the prior art, the technical scheme has different signal sources: the signal source of the light intensity time scale detector in the technical scheme is the internal integrated image side of the rotating mirror framing camera, the light intensity time scale detector can be repeatedly utilized, the signal is stable and is not disturbed by the long-distance space light environment, the light intensity time scale detector can obtain effective and reliable signals as long as the rotating mirror framing camera can successfully shoot, and the accuracy of time sequence diagnosis of the rotating mirror framing camera is greatly improved; the laser time mark system is based on a space light path, the light intensity time mark detector is an all-fiber light path from a signal source, the complex adjustment required by the space light path is ingeniously avoided, only the tail end of an optical fiber needs to be inserted into a corresponding test hole, and the operation is simple and convenient; the terminal signal receiving of the laser time mark system still uses the negative film, the acquisition effect is greatly influenced by the final effect of the negative film, the accurate discrimination difficulty of the signal is also high, the light intensity time mark detector adopts a high-precision photoelectric converter to receive the light signal, a precise electrical signal is obtained, a high-precision oscilloscope is adopted for recording, the sensitivity is greatly improved, the signal is clear and reliable, the discrimination difficulty is greatly reduced, and the time can be observed accurately only after the negative film is washed out when a camera is debugged because a laser time mark receiving party is the negative film; the system takes the light intensity as a criterion, takes the peak value or the half-height-width median moment of a light intensity signal as a criterion, and increases the time sequence diagnosis precision from a microsecond magnitude to a tens of ns magnitude, which is improved by more than ten times compared with a laser time scale system.

The xenon lamp lighting system comprises a pulse high-voltage power supply and a xenon lamp connected with the pulse high-voltage power supply, wherein the pulse high-voltage power supply is used for generating a negative high-voltage pulse signal to trigger the xenon lamp; the lighting system further comprises: the high-voltage transmission cable is used for connecting the pulse high-voltage power supply with the xenon lamp; the xenon lamp high-voltage power supply is used for charging high voltage for the xenon lamp; and the time delay module is used for controlling the xenon lamp triggering time.

The high-voltage pulse power supply is used for providing a high-voltage pulse signal for a xenon lamp of the rotating mirror framing camera to enable the xenon lamp to start working, high-voltage electricity required by working is provided for the xenon lamp by utilizing the arranged high-voltage transmission cable, and the arranged delay module adopts an ns-level delay module and is used for controlling the triggering time of the xenon lamp.

Furthermore, filters are arranged at the oscilloscope end of the time sequence detection system and between the pulse high-voltage power supply and the xenon lamp, and the filters are used for filtering electric signal interference generated by the high voltage of the initiation device and the high voltage of the xenon lamp.

Furthermore, the optical probes are respectively arranged at the position of the first picture and the position of the last picture of the rotating mirror framing camera.

Because the rotating mirror framing camera can take a plurality of pictures, in order to measure the photographing time of each picture, the two optical probes are respectively arranged at the first picture and the last picture of the rotating mirror framing camera, so that the photographing time of each picture of the rotating mirror framing camera can be measured.

Further, the photoelectric conversion module adopts a silicon photomultiplier or a silicon avalanche diode.

Because the scheme collects the change of light intensity to time to analyze the photographing time of the rotating mirror framing camera, in actual use, the external illumination intensity can be different along with the requirements of physical devices, the brightness degree of the light source can be artificially adjusted, secondly, after the camera shutter is exposed due to different use environments, field layout, weather, different reflection effects of different metal materials and the like, the illumination intensity entering the camera is different, the illumination is extremely strong under certain conditions, and the condition that the illumination is extremely weak can also occur under certain conditions, and laboratory tests show that the detector made of the two materials of the silicon photomultiplier and the silicon avalanche diode can form good complementary action, therefore, the detector with different sensitivities made of two materials of the silicon photomultiplier and the silicon avalanche diode is selected, the photoelectric module can adopt a silicon photomultiplier corresponding to a signal with lower light intensity, and a silicon avalanche diode corresponding to a signal with a strong light intensity angle.

The light detector comprises a light source, a light probe, a light intensity detector, a photoelectric conversion module, a light signal transmission fiber and a connecting flange, wherein the light probe is used for collecting light intensity of the light probe, the light intensity detector and the photoelectric conversion module are connected through the transmission fiber, the transmission fiber is used for transmitting the light signal collected by the light probe, and the connecting flange is used for connecting the inner fiber and the outer fiber of the light intensity detector.

The light intensity time scale calibration method for the time sequence diagnosis of the rotating mirror framing camera comprises the following steps:

step 1: after the system is built, performing state self-check on the system;

step 2: the method comprises the steps that a rotating mirror framing camera is started, when the rotating mirror framing camera reaches the rotation speed set by calculation, the rotating mirror framing camera triggers a delay synchronous machine after the delay of T0 through a fixed cable, the delay synchronous machine outputs two paths of signals, one path of signals triggers a detonating device, the detonating device can simultaneously output a synchronous trigger signal T1, and the other path of signals outputs a trigger illumination signal T2;

and step 3: the T1 signal triggers the light intensity time scale time sequence detection system after the transmission cable fixed time delay T3, and meanwhile, the light intensity time scale light probe enters the light intensity detector after the light intensity time scale light probe passes through the fixed cable time delay T4 from the inside of the rotating mirror framing camera;

and 4, step 4: the light intensity detector is converted into an electric signal after passing through the photoelectric conversion module, and then is recorded by the oscilloscope after being delayed by T5 through the fixed cable, and the oscilloscope can display the corresponding electric signal of light intensity change;

and 5: reading out the time difference T6 at the same amplitude of the light intensity time scale signal and the T2 signal through the waveform displayed by the oscilloscope;

step 6: calculating the photographing time of the first picture: Δ T1 ═ T6+ (T3-T4-T5);

and 7: if the probe is placed at the position of the last picture, the shooting time delta T2 of the last picture can be calculated, so that the shooting time interval of each picture can be calculated to be (delta T2-delta T1)/N, wherein N is the number of pictures shot by the rotating mirror framing camera;

and 8: and sequentially calculating the photographing time of each photo according to the calculated photographing time interval of each photo.

Further, the state self-check of the system in the step 1 comprises a light path part and a circuit part, wherein the main checking means of the light path part is to introduce red light to check whether the light path and the optical probe are intact or not and whether the requirements of the experiment are met or not; the circuit part adopts the optical probe to collect a standard optical signal, if the waveform time and the amplitude displayed in the oscilloscope are correct, the oscilloscope is considered to be normal, and when the oscilloscope is abnormal, the time and the amplitude do not correspond or the oscilloscope has no waveform.

Compared with the prior art, the invention has the following advantages and beneficial effects:

1. the light intensity signal in the invention is directly recorded by the oscilloscope, can be synchronously associated with the relevant overall time reference signal in the experiment, the whole of the signal of the rotating mirror framing camera and the signal of the experiment test system are accurately associated for the first time, the light intensity signal taken in the rotating mirror framing camera is taken as a signal source, the signal source is stable and reliable, the problem of difficult debugging of a space light path is avoided by adopting an all-fiber light path, the system is simple and convenient to build, meanwhile, the original technology adopts a negative film for receiving, the scheme adopts a high-sensitivity photoelectric conversion device for high-precision receiving, obtains a precise electrical signal and adopts the high-precision oscilloscope for recording, and the test precision is high; the time precision can reach nanosecond level;

2. the instruments adopted by the light intensity time scale detector are all electronic equipment, can be adopted in a common laboratory, have high safety performance, are easy to popularize and use, have small electromagnetic interference influence in the environment, are not influenced by the external environment, can be repeatedly used, have good economy, can quickly test and give results in a time sequence debugging stage, and have high experimental efficiency;

3. compared with a laser time mark, the signal source of the light intensity time mark detector is different from the signal source of the laser time mark, the signal source of the light intensity time mark detector is the inner part of the rotating mirror framing camera, namely the image side, and can be repeatedly used, the signal is stable and is not disturbed by a long-distance space light environment, the light intensity time mark detector can obtain an effective and reliable signal as long as the rotating mirror framing camera can successfully shoot, and the accuracy of time sequence diagnosis of the rotating mirror framing camera is greatly improved;

4. compared with the laser time mark, the light path of the invention is different, the laser time mark system is based on the space light path, the light intensity time mark detector is the all-fiber light path from the signal source, the complicated adjustment required by the space light path is ingeniously avoided, only the tail end of the optical fiber is inserted into the corresponding test hole, and the operation is simple and convenient;

5. compared with a laser time mark, the receiving mode of the invention is different, the terminal signal receiving of the laser time mark system still uses a negative film, the acquisition effect is greatly influenced by the final effect of the negative film, the accurate discrimination difficulty of the signal is also large, the light intensity time mark detector adopts a high-precision photoelectric converter to receive the light signal, obtain a precise electrical signal, adopts a high-precision oscilloscope to record, the sensitivity is greatly improved, the signal is clear and reliable, and the interpretation difficulty is greatly reduced;

6. compared with a laser time scale, the system has different interpretation basis, the system takes the light intensity as a criterion, takes the peak value or the half-height-width median moment of a light intensity signal as a criterion, increases the time sequence diagnosis precision from a microsecond level to a dozen ns level, and improves the time sequence diagnosis precision by more than ten times compared with a laser time scale system.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a block diagram of a light intensity time scale detector system for time sequence diagnosis of a rotating mirror framing camera according to the present invention;

FIG. 2 is a system block diagram of the lighting system of the present invention;

FIG. 3 is a system block diagram of a light intensity time scale system of the present invention;

fig. 4 is a detection waveform diagram when the photoelectric conversion module employs the PM;

fig. 5 is a detection waveform diagram when the photoelectric conversion module employs an APD.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.

Example 1

As shown in fig. 1 and 3, the present invention includes: the optical probes are arranged above the row of lenses of the rotating mirror framing camera and respectively correspond to two different pictures, and are used for acquiring light intensity and measuring the picture photographing time corresponding to the installation position; the light intensity detector is used for receiving the light intensity signal collected by the light probe; the photoelectric conversion module is used for converting the light intensity signal acquired by the light intensity detector into an electric signal; the time sequence detection system comprises an oscilloscope and an acquisition control module, wherein the oscilloscope is used for receiving the electric signals converted by the photoelectric conversion module and displaying the waveform of the light intensity along with the time change, and the acquisition control module is used for acquiring and processing the signals in the oscilloscope, reading waveform data and analyzing the time. The rotating mirror framing camera of the embodiment is provided with a detonating device, and the detonating device is provided with a time delay synchronous machine. The optical probe of the embodiment is specifically installed between a bottom box and a row lens of the rotating mirror framing camera, and is fixed above the row lens. The optical probe, the light intensity detector and the photoelectric conversion module of the embodiment jointly form a light intensity time scale system.

Example 2

As shown in fig. 2, on the basis of embodiment 1, the xenon lamp lighting system further includes a pulse high-voltage power supply and a xenon lamp connected to the pulse high-voltage power supply, wherein the pulse high-voltage power supply is used for generating a negative high-voltage pulse signal to trigger the xenon lamp.

Example 3

On the basis of embodiment 2, the lighting system further includes: the high-voltage transmission cable is used for connecting the pulse high-voltage power supply with the xenon lamp; the xenon lamp high-voltage power supply is used for charging high voltage for the xenon lamp; and the time delay module is used for controlling the xenon lamp triggering time. The delay module is realized by adopting a high-precision (ns-level) delay chip.

Example 4

On the basis of embodiment 2 or embodiment 3, the oscilloscope end of the timing sequence detection system and the pulse high-voltage power supply and the xenon lamp of the present embodiment are both provided with a filter, and the filter is used for filtering out electric signal interference generated by the high voltage of the initiation device and the high voltage of the xenon lamp.

Example 5

On the basis of the embodiment 1, the two optical probes are respectively arranged at the position of the first picture and the position of the last picture of the rotating mirror framing camera.

Example 6

In addition to embodiment 1, the photoelectric conversion module employs a silicon photomultiplier or a silicon avalanche diode.

Example 7

On the basis of embodiment 1, the light intensity time scale system of this embodiment further includes a condensing lens, a transmission optical fiber, and a connection flange, where the condensing lens is used to collect the light intensity at the position of the light probe, the light intensity detector, and the photoelectric conversion module are connected by the transmission optical fiber, the transmission optical fiber is used to transmit the light signal collected by the light probe, and the connection flange is used to connect the inner and outer optical fibers of the light intensity detector. The condensing lens is arranged on the optical probe and is integrated with the optical probe in actual use.

Example 8

The light intensity time scale calibration method for the time sequence diagnosis of the rotating mirror framing camera comprises the following steps:

step 1: after the system is built, performing state self-check on the system;

step 2: the method comprises the steps that a rotating mirror framing camera is started, when the rotating mirror framing camera reaches the rotation speed set by calculation, the rotating mirror framing camera triggers a delay synchronous machine after the delay of T0 through a fixed cable, the delay synchronous machine outputs two paths of signals, one path of signals triggers a detonating device, the detonating device can simultaneously output a synchronous trigger signal T1, and the other path of signals outputs a trigger illumination signal T2;

and step 3: the T1 signal triggers the light intensity time scale time sequence detection system after the transmission cable fixed time delay T3, and meanwhile, the light intensity time scale light probe enters the light intensity detector after the light intensity time scale light probe passes through the fixed cable time delay T4 from the inside of the rotating mirror framing camera;

and 4, step 4: the light intensity detector is converted into an electric signal after passing through the photoelectric conversion module, and then is recorded by the oscilloscope after being delayed by T5 through the fixed cable, and the oscilloscope can display the corresponding electric signal of light intensity change;

and 5: reading out the time difference T6 at the same amplitude of the light intensity time scale signal and the T2 signal through the waveform displayed by the oscilloscope;

step 6: calculating the photographing time of the first picture: Δ T1 ═ T6+ (T3-T4-T5);

and 7: if the probe is placed at the position of the last picture, the shooting time delta T2 of the last picture can be calculated, so that the shooting time interval of each picture can be calculated to be (delta T2-delta T1)/N, wherein N is the number of pictures shot by the rotating mirror framing camera;

and 8: and sequentially calculating the photographing time of each photo according to the calculated photographing time interval of each photo. The T1 signal is used for triggering an oscilloscope of the time sequence detection system in the light intensity time scale, the photographing time is calculated in advance according to experimental requirements, photographing can be started from a few microseconds to dozens of microseconds after detonation, and the light intensity time scale detector acquires a waveform similar to a triangular wave and records the waveform on the oscilloscope during photographing.

The state self-inspection of the system in the step 1 comprises a light path part and a circuit part, wherein the light path part is mainly inspected by introducing red light to inspect whether a light path and an optical probe are intact or not and whether the test requirements are met or not; the circuit part adopts the optical probe to collect a standard optical signal, if the waveform time and the amplitude displayed in the oscilloscope are correct, the oscilloscope is considered to be normal, and when the oscilloscope is abnormal, the time and the amplitude do not correspond or the oscilloscope has no waveform. In step 2 of this embodiment, the set rotation speed is determined by the interval between the photographed frames of each photo required by the experiment, the interval time is different, and the rotation speed of the prism of the rotating mirror framing camera is different, and is usually set to 3000 rpm.

There are rotating mirror framing cameras of various specifications on the market, the number of the taken pictures is different, and 40 pictures are preferably taken when the embodiment is applied, but the embodiment is limited to taking 40 pictures and is not limited to adopting a rotating mirror camera with 40 measured pictures. The time of only measuring the first and the last frames can be limited during shooting, the time of any photo can be measured, and only in use, due to experimental requirements, most of the photos are placed at the first and the last frames. The embodiment can also be used for calibrating the interval of each photo frame of the rotating mirror camera when in application.

In the application of this embodiment, a detection waveform diagram when the photoelectric conversion module employs the PM is shown in fig. 4, and a detection waveform diagram when the photoelectric conversion module employs the APD is shown in fig. 5. The following functions can be realized through the waveform diagram in the embodiment: firstly, the curve of the change of the illumination intensity along with the time when the rotating mirror framing camera takes each picture can be seen through the oscillogram. Secondly, if the brightness of the picture is not uniform in the experiment, the time of the brightness non-uniformity and the illumination state of the xenon lamp can be rapidly judged through the oscillogram. And thirdly, if the negative film has no photo, the problem of failure of the illumination system or the camera can be quickly judged. And fourthly, the photographing time of the camera can be analyzed through the waveform.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.