CN114567772A - Method and system for measuring optical gating time characteristic of image intensifier - Google Patents
Method and system for measuring optical gating time characteristic of image intensifier Download PDFInfo
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Abstract
The invention provides a measuring method and a measuring system for optical gating time characteristics of an image intensifier, and mainly solves the problems that the conventional method for measuring the gating time of the image intensifier is complex in measuring process, complex in data processing and incapable of acquiring more comprehensive and accurate gating time of the image intensifier. The system and the method are based on an ultrashort laser pulse scanning method, a photoelectric detector is adopted to replace a rear-end CCD camera recording system, 2 laser pulses with fixed time intervals are output by single triggering of a laser, the 1 st light pulse is used as a triggering source to trigger a gated shutter pulse circuit of an image intensifier, and exposure image integral signals of the 2 nd laser pulse at different door opening moments of the image intensifier are obtained, so that the optical gating time characteristic of the image intensifier is obtained, and the system and the method have higher synchronous triggering time precision.
Description
Technical Field
The invention belongs to the field of high-speed photogrammetry, and particularly relates to a method and a system for measuring optical gating time characteristics of an image intensifier, which are applied to the measurement of time performance indexes of a calibration high-speed photography system and are suitable for the measurement of the optical gating time characteristics of the gating type image intensifier used by various high-speed photoelectric framing cameras.
Background
High-speed photography is a method for researching a high-speed motion process, and is one of important optical diagnosis means in the research fields of detonation physics, shock wave physics, accelerator physics, plasma physics experiments, ultrafast optical tomography imaging and the like. The common high-speed photography is an ultra-high speed photoelectric framing camera, which mainly comprises an imaging objective lens, a light splitting system, a gate-controlled image intensifier, an optical relay coupling, a CCD camera, a control circuit and the like. The gated image intensifier is a key device in the core, and mainly plays the roles of an optical shutter and image intensification. The speed of the optical shutter determines the speed of the image intensifier and also determines the exposure time of the image. The gating time of the image intensifier depends on the width of the loaded gating electric pulse, the rise time and the self response capability. Because the electric pulse establishes the temporal-spatial variation process of the electric field on the cathode, the output optical image also changes, so that the practical use is meaningful in measuring the variation curve of the output optical image intensity of the gating type image intensifier along with the gating time, namely the optical gating time characteristic curve, thereby obtaining the optical exposure time of the gating type image intensifier.
The method for measuring the gating time of the image intensifier comprises the following two methods, one method is an ultrashort laser pulse scanning method, the method continuously adjusts the time delay of a laser pulse and a gating high-voltage electric pulse reaching an image intensifying photoelectric cathode, output images of the laser pulse at different gating moments are collected through a CCD camera at the rear end, gating time sequence images are obtained, the gating time of the gating time sequence images can be interpreted, and an optical gating time characteristic curve can be given after the time sequence images are processed and analyzed; the other is to adopt a time-delay optical fiber array, an input array is formed by a group of optical fibers with equal length difference, under the irradiation of single ultra-short pulse laser, the optical fiber array outputs an equally-delayed laser point array, and the exposure time of the image intensifier is calculated by shooting the number of laser points output by the optical fiber array and the optical time delay between adjacent optical fibers at one time. However, in the two methods, the back end of the image is required to be acquired by using a CCD camera, the first method needs to carry out measurement for many times and needs to process, analyze and count time-series image data, the measurement process is complicated, and the data processing is complex; although the second method has few measurement times, only a single exposure time parameter can be given, an optical gating time characteristic curve cannot be given, the gating time characteristic cannot be known more comprehensively, and a more comprehensive and accurate optical gating time characteristic curve cannot be obtained.
Disclosure of Invention
The method aims to solve the problems that the existing method for measuring the gating time of the image intensifier is complex in measuring process, complex in data processing and incapable of obtaining the gating time of the image intensifier comprehensively and accurately. The invention provides a measuring method and a measuring system for optical gating time characteristics of an image intensifier. The system and the method are based on an ultrashort laser pulse scanning method, a photoelectric detector is adopted to replace a rear-end CCD camera recording system, the data processing and implementation process is simplified, and meanwhile, the accurate light output decay time characteristic of an image intensifier fluorescent screen can be obtained.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the method for measuring the optical gating time characteristic of the image intensifier provided by the invention comprises the following steps:
firstly, an ultrafast laser is triggered once to output 2 laser pulses with fixed time intervals, the 2 laser pulses are expanded and then divided into two paths, wherein one path is a transmission light pulse, and the other path is a reflection light pulse, the transmission light pulse of the 1 st laser pulse is a trigger source, and the reflection light pulse of the 2 nd laser pulse is used as an exposure light source of a gate image intensifier;
step two, the transmitted light pulse of the 1 st laser pulse is converted into an electric signal after homogenization treatment; the electric signal is divided into two paths, one electric signal is used for monitoring light intensity, and the other electric signal triggers a delay pulse generator; the electric pulse output by the delay pulse generator triggers the gated shutter pulse generator, and is used for providing cathode gating shutter pulse for the gated image intensifier so as to gate the gate by the cathode of the gated image intensifier;
after homogenization treatment, the reflected light pulse of the 2 nd laser pulse is incident to a photoelectric cathode of the gate image intensifier and converted into an electronic image; when the gated shutter pulse of the gated shutter pulse generator is loaded on the photocathode, the electronic image is enhanced by the gated shutter pulse and then received by a second photodetector arranged at the output end of the gated image enhancer;
and step three, obtaining output waveforms of the second photoelectric detector under different delays by adjusting the delay step length of the delay pulse generator, counting the amplitude of the output waveforms under the delay time sequence, and obtaining a relation curve between the signal output amplitude and the delay time, so as to obtain the optical gating time characteristic of the image intensifier.
Further, in step three, the delay pulse generator adjusts the step size of the delay every time to be 20 ps.
The invention provides a system for measuring optical gating time characteristics of an image intensifier, which comprises a pulse generator, an ultrafast laser, a beam expander, a semi-reflecting and semi-transmitting mirror, a first diffuse scattering glass sheet, a gated image intensifier, a second diffuse scattering glass sheet, a first photoelectric detector, a second photoelectric detector, a power divider, an oscilloscope, a delayed pulse generator, a gated shutter pulse generator and a second photoelectric detector, wherein the pulse generator is connected with the pulse generator; the pulse generator is connected with the ultrafast laser and used for triggering the ultrafast laser to output laser pulses; the beam expander and the semi-reflective and semi-transparent mirror are sequentially arranged on a laser pulse light path output by the ultrafast laser, and laser pulses are expanded by the beam expander and then are incident to the semi-reflective and semi-transparent mirror to be divided into two paths of laser pulses, wherein one path of laser pulses is transmission laser pulses, and the other path of laser pulses is reflection laser pulses; the first diffuse scattering glass sheet and the first photoelectric detector are sequentially arranged in a light path of the transmission laser pulse, and the laser pulse on the transmission light path is subjected to homogenization treatment by the first diffuse scattering glass sheet and then enters the first photoelectric detector; the first photoelectric detector converts the homogenized optical signal into an electric signal, the input end of the power divider is connected with the first photoelectric detector, the output end of the power divider is respectively connected with the delay pulse generator and the oscilloscope, the power divider divides the electric signal output by the first photoelectric detector into two paths, one path of the electric signal is input into the oscilloscope for light intensity monitoring, and the other path of the electric signal triggers the delay pulse generator; the time delay pulse generator is connected with the gate-controlled shutter pulse generator, and the electric pulse output by the time delay pulse generator triggers the gate-controlled shutter pulse generator and is used for providing cathode door opening pulse for the gate-controlled image intensifier; the second diffuse scattering glass sheet and the gate control image intensifier are sequentially arranged in a light path of the reflected laser pulse, and the laser pulse on the reflected light path is subjected to homogenization treatment by the second diffuse scattering glass sheet and then is incident to a photoelectric cathode of the gate control image intensifier to be converted into an electronic image; and the electronic image is received by a second photodetector arranged at the output end of the gated image intensifier, is converted into an electric signal, and the electric signal is input into an oscilloscope for display.
Furthermore, a BBO frequency doubling crystal is arranged between the ultrafast laser and the beam expander and used for changing the wavelength of the laser pulse.
Furthermore, the pulse width of the ultrafast laser is less than 1ns, the trigger jitter is less than 50ps, the time interval of 2 laser pulses is more than 200ns, and the time interval jitter is better than 10ps
Further, the trigger jitter and delay accuracy of the delay pulse generator and the pulse generator is less than 20 ps.
Further, the second photodetector is a photo-electric tube or a photo-multiplier tube detector.
Further, the first photodetector is an ultrafast photodetector, specifically, a photoelectric tube.
Compared with the prior art, the invention has the following beneficial effects:
1. the method and the system for measuring the optical gating time characteristic of the image intensifier replace a back-end CCD camera by a photoelectric detector and record the integral intensity of an exposure image signal under different gating times so as to obtain the optical gating time characteristic of the image intensifier. The method simplifies data processing and implementation processes, and simultaneously can obtain the light output decay time characteristic of the rear fluorescent screen of the image intensifier.
2. The system adopts a double-pulse laser with stable output time interval under single trigger, uses the 1 st laser pulse as the trigger source of the gated shutter pulse generator, provides gated shutter pulse for the gated image intensifier, enables the photocathode to open the door, obtains the exposure image signals of the 2 nd pulse under different gating time, and improves the synchronous trigger precision.
Drawings
FIG. 1 is a schematic diagram of a system for measuring optical gating time characteristics of an image intensifier according to the present invention;
FIG. 2 is a schematic diagram of the output signals of the photomultiplier tube when the door control image intensifier opens the door according to the embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating the output signals of the photomultiplier tube when the image intensifier is closed according to the embodiment of the present invention;
FIG. 4 is a diagram illustrating an optical gating time characteristic curve of the measured ultrafast gated image intensifier in an embodiment of the present invention.
Reference numerals: the device comprises a pulse generator 1, an ultrafast laser 2, a frequency doubling crystal 3-BBO, a beam expander 4, a half-reflecting and half-transmitting mirror 5, a first diffuse scattering glass sheet 6, a gate-controlled image intensifier 7, a second diffuse scattering glass sheet 8, a first photoelectric detector 9, a power divider 10, an oscilloscope 11, a time delay pulse generator 12, a gate-controlled shutter pulse generator 13 and a second photoelectric detector 14.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention and are not intended to limit the scope of the present invention.
The invention provides a measuring method and a measuring system for optical gating time characteristics of an image intensifier. The method is based on an ultrashort laser pulse scanning method, the photoelectric detector is adopted at the rear end of the image enhancement to replace a traditional CCD camera, and light intensity signals output by the image enhancement device at different door opening moments are recorded, so that the optical gating time characteristic of the image enhancement device is given, the optical exposure time of the image enhancement can be judged, and meanwhile, the luminescent attenuation time characteristic of a fluorescent screen at the rear end of the image enhancement device can also be obtained. The system and the method have wide application prospect in the field of development of gating type image intensifiers and measurement of optical gating time characteristics and exposure time of ultrahigh-speed photoelectric framing cameras.
The method of the invention utilizes a laser to trigger and output 2 laser pulses at a time, uses the 1 st laser pulse as a trigger source to open the door of the photocathode of the image intensifier, obtains the exposure image of the 2 nd laser pulse, triggers a delay pulse generator 12 by the 1 st laser pulse, further triggers a gated shutter pulse generator 13, loads a gated shutter pulse for the photocathode of the gated image intensifier 7, and opens the door of the photocathode. The shutter pulse loaded on the photocathode and the 2 nd laser pulse are synchronized by adjusting the time delay of the time delay pulse generator 12, and the gated image signal output and recording under different time delays are realized. And (4) counting a relation curve of the amplitude of the photoelectric detection output signal at the rear end of the image intensifier along with the set delay of the pulse delay generator, thereby giving the optical gating time characteristic of the image intensifier. Specifically, the method for measuring the optical gating time characteristic of the image intensifier provided by the invention comprises the following steps:
firstly, an ultrafast laser 2 triggers and outputs 2 laser pulses with fixed time intervals once, the 2 laser pulses are expanded and then divided into two paths, one path is a transmission light pulse, the other path is a reflection light pulse, wherein the transmission light pulse of the 1 st laser pulse is a trigger source, and the reflection light pulse of the 2 nd laser pulse is used as an exposure light source of a gate image intensifier 7;
step two, the transmitted light pulse of the 1 st laser pulse is converted into an electric signal after homogenization treatment; the electric signal is divided into two paths, one is used for monitoring the light intensity, and the other electric signal triggers the delay pulse generator 12; the electric pulse output by the delay pulse generator 12 triggers the gated shutter pulse generator 13, which is used for providing cathode gated shutter pulse for the gated image intensifier 7, so that the cathode of the gated image intensifier 7 is gated to open the door;
after the reflected light pulse of the 2 nd laser pulse is homogenized, the reflected light pulse is incident to a photoelectric cathode of a gate image intensifier 7 and is converted into an electronic image; when the gated shutter pulse of the gated shutter pulse generator 13 is applied to the photocathode, an electronic image is gated and enhanced, and the electronic image is received by the second photodetector 14 provided at the output of the gated image enhancer 7 and converted into an electrical signal;
and step three, obtaining the output waveform of the electrical signal of the second photoelectric detector 14 under different delays by adjusting the delay step length of the delay pulse generator 12, and counting the amplitude of the output waveform under the delay time sequence, thereby obtaining a relation curve between the signal output amplitude and the delay time and obtaining the optical gating time characteristic of the gated image intensifier 7.
As shown in fig. 1, the present invention further provides a system for measuring an optical gating time characteristic of an image intensifier for implementing the method, where the system includes a pulse generator 1, an ultrafast laser 2, a BBO frequency doubling crystal 3, a beam expander 4, a half-reflecting and half-transmitting mirror 5, a first diffuse scattering glass sheet 6, a gated image intensifier 7, a second diffuse scattering glass sheet 8, a first photodetector 9, a second photodetector 14, a power divider 10, an oscilloscope 11, a delayed pulse generator 12, and a gated shutter pulse generator 13.
The system adopts an ultrafast laser 2 as a light source, and a pulse generator 1 is connected with the ultrafast laser 2 and used for triggering the ultrafast laser 2 to output laser pulses; BBO doubling crystal 3, beam expander 4, half reflection semi-transparent mirror 5 set gradually on the laser pulse optical path of ultrafast laser 2 output, and laser pulse passes through BBO doubling crystal 3 and changes the wavelength to incide to half reflection semi-transparent mirror 5 after expanding the beam through beam expander 4 and divide into two way laser pulse, be transmission laser pulse all the way, be reflection laser pulse all the way.
The first diffuse scattering glass sheet 6 and the first photoelectric detector 9 are sequentially arranged in a light path of the transmission laser pulse, and the laser pulse on the transmission light path is subjected to homogenization treatment by the first diffuse scattering glass sheet 6 and then enters the first photoelectric detector 9; the first photoelectric detector 9 converts the homogenized optical signal into an electrical signal, the input end of the power divider 10 is connected with the first photoelectric detector 9, the output end of the power divider is respectively connected with the delay pulse generator 12 and the oscilloscope 11, and the power divider is used for dividing the electrical signal output by the first photoelectric detector 9 into two paths, one electrical signal is input into the oscilloscope 11 and used for monitoring the intensity of the laser pulse, and the other electrical signal triggers the delay pulse generator 12; the delay pulse generator 12 is connected with the gated shutter pulse generator 13, and the electric pulse output by the delay pulse generator 12 triggers the gated shutter pulse generator 13 to provide a cathode door opening pulse for the gated image intensifier 7. The second diffuse scattering glass sheet 8 and the gate control image intensifier 7 are sequentially arranged in a light path of the reflected laser pulse, the output end of the gate control image intensifier 7 collects and outputs optical signals by adopting a second photoelectric detector 14, and the optical signals on the whole screen surface of the image intensifier can be collected by the second photoelectric detector 14 at the rear end. Laser pulses on the reflection light path are homogenized by a second diffuse scattering glass sheet 8 and then are uniformly incident to a photoelectric cathode of a gate image intensifier 7 to be converted into an electronic image; when the gating shutter pulse is loaded on the photocathode, the electronic image is gated and enhanced, and is shot on the fluorescent screen to form an optical image, and optical image signals on the whole fluorescent screen are collected by the second photoelectric detector 14 to form an electric signal which is recorded by a data acquisition instrument or an oscilloscope 11.
In the system, a pulse generator 1 provides a trigger signal, a single-trigger ultrafast laser 2 outputs 2 laser pulses with a fixed time interval, the 1 st laser pulse is used as a trigger source to trigger a delay pulse generator 12, and the delay pulse generator 12 outputs a signal to trigger a gated high-voltage shutter pulse circuit to enable a cathode of a gated image intensifier 7 to gate the gate, so that an exposure image of the 2 nd laser pulse is acquired. Specifically, 2 laser pulses output by single trigger are expanded and then divided into two paths, after the two paths of laser pulse beams are homogenized, one path of laser pulse beams is input to a first photoelectric detector 9 to be collected to form an electric signal, the electric signal is divided into two paths by a power divider, one path of laser pulse beams is used for monitoring light intensity, the other path of laser pulse beams is used for triggering a time delay generator 12, and a gate control image intensifier shutter pulse generator 13 is further triggered; the other path of laser pulse is uniformly irradiated on a photocathode of the gate control image intensifier 7, and after the gate control image intensifier 7 is output by a shutter pulse generator 13 and is subjected to pulse gating, the 2 nd laser pulse image reaching the photocathode is collected. The output end of the gated image intensifier 7 is connected with a second photodetector 14, and the second photodetector 14 collects the optical signal waveform from the whole output surface of the fluorescent screen.
The second photodetector 14 is arranged at the rear end of the gated image intensifier 7, and can be a photoelectric tube or a photomultiplier tube, and the time response is in ns magnitude, so that no specific requirement is made, and the requirements of actual tests are determined. The first photodetector 9 is used to monitor the laser pulse intensity, and is in particular an ultrafast photodetector, for example a photocell, with a time response of less than 1 ns.
The wavelength of the ultrafast laser 2 is 532nm, or the laser with the wavelength can be generated by frequency doubling, the pulse width is less than 1ns, the trigger jitter is less than 50ps, the ultrafast laser has an external trigger function, and the parameters are determined according to actual measurement requirements. The trigger jitter and delay accuracy of pulse generator 1 and delay pulse generator 12 is better than 50 ps. Oscilloscope 11 is a multichannel high bandwidth data acquisition system or oscilloscope 11, and is used for recording the amplitude of the photoelectric detection output signal.
In the embodiment of the invention, a mode of triggering a laser once and simultaneously generating 2 laser pulses with stable time intervals is adopted, the 1 st light pulse is used as a triggering source to trigger a gated shutter pulse circuit of an image intensifier, and the image intensifier is opened to shoot an image of the 2 nd laser pulse. The time interval of two laser pulses is designed to be 1us in the example. The ultrafast laser 2 is an Anyang laser with a pulse width of 400fs, the output wavelength is 1080nm, and the repetition frequency is 0.025 MHz-5 MHz. The ultrafast laser 2 is triggered by a pulse generator 1, outputs laser pulses of about 540nm after passing through a BBO frequency doubling crystal 3, expands the beams through a beam expander 4, then is divided into 2 beams through a semi-reflecting and semi-transmitting lens 5, one beam is homogenized by a second diffuse scattering glass sheet 8 and then irradiates on a cathode of the ultrafast gating image intensifier, the cathode is uniformly irradiated, and the other beam enters a first photoelectric detector 9 through a first diffuse scattering glass sheet 6. The electrical signal output by the first photodetector 9 is divided into two paths by the power divider 10, one path is directly input into one channel of the oscilloscope 11 for monitoring light intensity, the other path is used for triggering the delay pulse generator 12, and the electrical pulse output by the delay pulse generator 12 triggers the high-voltage gated shutter pulse circuit of the ultrafast gated image intensifier 7 to provide cathode door opening pulse for the image intensifier. The output end of the image gating enhancer 7 collects an optical signal by a second photodetector 14 and inputs the optical signal into another channel of the oscilloscope 11 for recording. Testing of this scheme trigger jitter shows that the overall system trigger jitter is about 25 ps.
The delay setting of the pulse generator 1 can be roughly given by calculating the travel time generated by the optical signal and the electrical signal through each path, so that the second laser pulse and the high-voltage gated shutter pulse triggered and output by the first laser pulse synchronously reach the photocathode of the image intensifier, then the delay step length of the delay pulse generator 12 is finely adjusted, the output signal of the second photoelectric detector 14 is gradually increased from the minimum to the minimum, then is gradually reduced, the waveform of the output signal of the second photoelectric detector 14 under each time delay is recorded, the amplitude of the waveform under the time delay sequence is counted, and the optical gating time characteristic curve can be drawn. The output signals of the photomultiplier tube under the incidence of the laser pulses arriving at different times in the door opening period by the gate control image intensifier 7 are shown in fig. 2, and the signals obtained under the incidence of the laser pulses when the cathode of the image intensifier is closed are shown in fig. 3; the optical gating time characteristic curve of the measured ultrafast gated image intensifier 7 under the driving of the shutter electric pulse with the half width of 1ns is shown in fig. 4. In the embodiment, the delay pulse generator 12 is designed to adjust the delay step size at each time to be 20 ps.
Claims (8)
1. A method for measuring optical gating time characteristics of an image intensifier is characterized by comprising the following steps:
firstly, an ultrafast laser (2) is triggered once to output 2 laser pulses with fixed time intervals, the 2 laser pulses are expanded and then divided into two paths, one path is a transmission light pulse, the other path is a reflection light pulse, wherein the transmission light pulse of the 1 st laser pulse is a trigger source, and the reflection light pulse of the 2 nd laser pulse is used as an exposure light source of a gate control image intensifier (7);
step two, the transmitted light pulse of the 1 st laser pulse is converted into an electric signal after homogenization treatment; the electric signal is divided into two paths, one electric signal is used for monitoring the light intensity, and the other electric signal triggers a delay pulse generator (12); the electric pulse output by the delay pulse generator (12) triggers a gated shutter pulse generator (13) which is used for providing cathode gated shutter pulse for the gated image intensifier (7) so as to open the cathode gate of the gated image intensifier (7);
after the reflected light pulse of the 2 nd laser pulse is subjected to homogenization treatment, the reflected light pulse is incident to a photoelectric cathode of a gate control image intensifier (7) and is converted into an electronic image; when the gated shutter pulse of the gated shutter pulse generator (13) is applied to the photocathode, the electronic image is enhanced by the gated shutter pulse and is subsequently received by a second photodetector (14) arranged at the output of the gated image enhancer (7);
and thirdly, obtaining the output waveform of the second photoelectric detector (14) under different delays by adjusting the delay step length of the delay pulse generator (12), counting the amplitude of the output waveform under the delay time sequence, and obtaining a relation curve between the signal output amplitude and the delay time, thereby obtaining the optical gating time characteristic of the image intensifier.
2. The method for measuring optical gating time characteristics of an image intensifier as claimed in claim 1, wherein: in the third step, the delay pulse generator (12) adjusts the step size of the delay every time to be 20 ps.
3. A system for measuring optical gating time characteristics of an image intensifier, comprising: the system comprises a pulse generator (1), an ultrafast laser (2), a beam expander (4), a half-reflecting and half-transmitting mirror (5), a first diffuse scattering glass sheet (6), a gate control image intensifier (7), a second diffuse scattering glass sheet (8), a first photoelectric detector (9), a second photoelectric detector (14), a power divider (10), an oscilloscope (11), a time delay pulse generator (12) and a gate control shutter pulse generator (13);
the pulse generator (1) is connected with the ultrafast laser (2) and is used for triggering the ultrafast laser (2) to output laser pulses; the beam expander (4) and the semi-reflecting and semi-transmitting lens (5) are sequentially arranged on a laser pulse light path output by the ultrafast laser (2), the laser pulse is expanded by the beam expander (4) and then enters the semi-reflecting and semi-transmitting lens (5) to be divided into two paths of laser pulses, one path of laser pulse is transmission laser pulse, and the other path of laser pulse is reflection laser pulse;
the first diffuse scattering glass sheet (6) and the first photoelectric detector (9) are sequentially arranged in a light path of the transmission laser pulse, and the laser pulse on the transmission light path is subjected to homogenization treatment by the first diffuse scattering glass sheet (6) and then is incident to the first photoelectric detector (9); the first photoelectric detector (9) converts the homogenized optical signal into an electrical signal, the input end of the power divider (10) is connected with the first photoelectric detector (9), the output end of the power divider is respectively connected with the delay pulse generator (12) and the oscilloscope (11), the power divider (10) divides the electrical signal output by the first photoelectric detector (9) into two paths, one electrical signal is input into the oscilloscope (11) for light intensity monitoring, and the other electrical signal triggers the delay pulse generator (12); the delay pulse generator (12) is connected with the gate-controlled shutter pulse generator (13), and the electric pulse output by the delay pulse generator (12) triggers the gate-controlled shutter pulse generator (13) and is used for providing a cathode opening pulse for the gate-controlled image intensifier (7);
the second diffuse scattering glass sheet (8) and the gate-controlled image intensifier (7) are sequentially arranged in a light path for reflecting laser pulses, and the laser pulses on the reflected light path are homogenized by the second diffuse scattering glass sheet (8) and then are incident to a photoelectric cathode of the gate-controlled image intensifier (7) to be converted into an electronic image; the electronic image is received by a second photodetector (14) arranged at the output end of the gated image intensifier (7) and converted into an electric signal, and the electric signal is input into an oscilloscope (11) for display.
4. The system for measuring optical gating time characteristics of an image intensifier as claimed in claim 3, wherein: and a BBO frequency doubling crystal (3) is arranged between the ultrafast laser (2) and the beam expander (4) and is used for changing the wavelength of laser pulses.
5. The system for measuring optical gating time characteristics of an image intensifier as claimed in claim 3, wherein: the pulse width of the ultrafast laser (2) is less than 1ns, the trigger jitter is less than 50ps, the time interval of 2 laser pulses is more than 200ns, and the time interval jitter is better than 10 ps.
6. The system for measuring optical gating time characteristics of an image intensifier as claimed in claim 3, wherein: the trigger jitter and delay precision of the delay pulse generator (12) and the pulse generator (1) are less than 20 ps.
7. The system for measuring optical gating time characteristics of an image intensifier as claimed in claim 3, wherein: the second photodetector (14) is a photoelectric tube or photomultiplier detector.
8. The system for measuring optical gating time characteristics of an image intensifier as claimed in claim 3, wherein: the first photoelectric detector (9) is an ultrafast photoelectric detector, in particular a photoelectric tube.
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| CN202210168100.XA CN114567772B (en) | 2022-02-23 | 2022-02-23 | Measuring method and measuring system for optical gating time characteristics of image intensifier |
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| CN115184945A (en) * | 2022-08-08 | 2022-10-14 | 西北核技术研究所 | Signal restoration method for measuring pulse laser based on array detection method |
| CN115452726A (en) * | 2022-09-04 | 2022-12-09 | 南京理工大学 | System and method for measuring temperature-dependent elastic constant of sheet material based on Lamb resonance mode |
| CN115469115A (en) * | 2022-11-14 | 2022-12-13 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Fluorescence detection method and device |
| CN116600211A (en) * | 2023-06-09 | 2023-08-15 | 苏州洞悉科技有限公司 | Imaging system |
| CN118311007A (en) * | 2024-06-11 | 2024-07-09 | 中国工程物理研究院激光聚变研究中心 | X-ray image offline reading system and method based on time-sharing and repetition frequency method |
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| CN115184945A (en) * | 2022-08-08 | 2022-10-14 | 西北核技术研究所 | Signal restoration method for measuring pulse laser based on array detection method |
| CN115452726A (en) * | 2022-09-04 | 2022-12-09 | 南京理工大学 | System and method for measuring temperature-dependent elastic constant of sheet material based on Lamb resonance mode |
| CN115452726B (en) * | 2022-09-04 | 2024-05-17 | 南京理工大学 | System and method for measuring temperature-dependent elastic constants of sheet materials based on Lamb resonance mode |
| CN115469115A (en) * | 2022-11-14 | 2022-12-13 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Fluorescence detection method and device |
| CN115469115B (en) * | 2022-11-14 | 2023-01-31 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Fluorescence detection method and device |
| CN116600211A (en) * | 2023-06-09 | 2023-08-15 | 苏州洞悉科技有限公司 | Imaging system |
| CN116600211B (en) * | 2023-06-09 | 2024-01-02 | 苏州洞悉科技有限公司 | Imaging system |
| CN118311007A (en) * | 2024-06-11 | 2024-07-09 | 中国工程物理研究院激光聚变研究中心 | X-ray image offline reading system and method based on time-sharing and repetition frequency method |
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