CN113049121A - Device and method for measuring pulse laser flash time - Google Patents
Device and method for measuring pulse laser flash time Download PDFInfo
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Abstract
The invention relates to a device and a method for measuring the flash time of a pulse laser, wherein the device comprises: the system comprises a receiving array, a detector array, an acquisition board and an upper computer; the receiving array comprises a plurality of laser light receiving heads, each laser light receiving head corresponds to one pulse laser, and the laser light receiving heads are arranged at the light outlet of the corresponding pulse lasers and used for receiving scattered light of laser light generated by the pulse lasers; the detector array comprises a plurality of photoelectric detectors, each photoelectric detector corresponds to one laser light receiving head, each laser light receiving head is connected to the corresponding photoelectric detector through a transmission optical fiber, and each photoelectric detector is connected to the acquisition board through a signal cable; the acquisition board is used for receiving and recording the flashing time of each pulse laser and transmitting the recording result to the upper computer. The invention can realize high-precision measurement of the flash time of a plurality of pulse lasers.
Description
Technical Field
The invention relates to the technical field of sensing measurement and ultrahigh-speed imaging, in particular to a device and a method for measuring the flash moment of a pulse laser.
Background
In an ultra-high speed imaging system, a pulse laser is a key device for providing imaging energy and ensuring imaging definition, the position and attitude information of a shot object at the current moment can be obtained by processing the image of the shot object in an imaging picture, the position and attitude information of the shot object at each point can be obtained by multi-point imaging shooting, and when the shooting information of each point is arranged according to a time sequence, the continuously-changed position and attitude information of the shot object can be obtained. The ultra-high speed imaging technology generally depends on a pulse laser as a light source of an imaging picture, and the imaging pictures of a plurality of point positions are associated by obtaining a plurality of pulse laser flash time, so that the requirement on the measurement accuracy of the pulse laser flash time is high, and the higher the timing resolution of the pulse laser flash time is, the better the timing resolution is.
At present, a known flash time measuring method generally adopts a distributed direct photoelectric detection measuring method, and when the method is applied to long-distance multi-measuring-point positions, factors such as distributed installation of photoelectric devices, transmission attenuation of electric signals on long lines, uncertainty of time delay duration of circuits, easiness in interference of cable long line transmission and the like have large influence, and particularly when a plurality of pulse lasers are arranged, the method cannot meet the measuring requirement of a complex environment.
Disclosure of Invention
The invention aims to overcome at least part of defects, and provides a device and a method for distributing, collecting and uniformly measuring flash time of a plurality of pulse lasers, so as to realize high-precision measurement of flash time of a pulse laser sequence and improve timing resolution.
In order to achieve the above object, the present invention provides an apparatus for measuring a flash timing of a pulsed laser, comprising: the system comprises a receiving array, a detector array, an acquisition board and an upper computer; wherein the content of the first and second substances,
the receiving array comprises a plurality of laser light-receiving heads, each laser light-receiving head corresponds to one pulse laser, and the laser light-receiving heads are arranged on one side of the light outlet of the corresponding pulse laser and used for receiving scattered light of laser light generated by the pulse laser;
the detector array comprises a plurality of photoelectric detectors, each photoelectric detector corresponds to one laser light-receiving head, each laser light-receiving head is respectively connected to the corresponding photoelectric detector through a transmission optical fiber, and each photoelectric detector is respectively connected to the acquisition board through a signal cable;
the acquisition board is used for receiving and recording the flashing time of each pulse laser and transmitting the recording result to the upper computer.
Preferably, the laser light receiving head comprises an arc-shaped receiving part, a connecting and fixing section and an optical fiber interface; wherein the content of the first and second substances,
the arc receives the piece and has a non-light tight arcwall face for receive light and assemble light extremely the middle part of fiber interface, fiber interface has hollow socket for connect corresponding transmission optical fiber's tip, connect the canned paragraph and be used for connecting the arc receive the piece with fiber interface to the fixed setting is corresponding pulse laser's light-emitting port department.
Preferably, the transmission fiber is a multimode fiber and has a diameter not less than 125 μm.
Preferably, the photodetector comprises a photodiode, the photodiode being in a reverse-biased state.
Preferably, the photodetector further includes a first amplifier, first to fourth resistors R1 to R4, and first to fifth capacitors C1 to C5; wherein the content of the first and second substances,
the P pole of the photodiode is connected with an analog ground AGND through a first resistor R1, and is connected with the positive input end IN + of the first amplifier through a third resistor R3, the PAD end of the photodiode is connected with an analog ground AGND, the N pole of the photodiode is connected with a positive input voltage through a fourth resistor R4, and is connected with the analog ground AGND through a third capacitor C3;
the negative input end IN-of the first amplifier is connected with an analog ground AGND through a second resistor R2;
the positive power supply end VCC of the first amplifier is connected with a positive input voltage, and is connected with an analog ground AGND through a first capacitor C1 and a second capacitor C2 which are connected in parallel, wherein the second capacitor C2 is an active capacitor, and the positive electrode of the second capacitor C2 is connected with the positive input voltage;
the negative power supply terminal VEE of the first amplifier is connected with a negative input voltage and is connected with an analog ground AGND through a fourth capacitor C4 and a fifth capacitor C5 which are connected in parallel, wherein the fifth capacitor C5 is an active capacitor, and the anode of the fifth capacitor is connected with the analog ground AGND;
the output OUT of the first amplifier is connected to the acquisition board by a corresponding signal cable.
Preferably, the acquisition board comprises an FPGA chip and a plurality of acquisition channels, and each acquisition channel corresponds to one signal cable;
the acquisition channel comprises a comparison voltage generation circuit and a differential comparison circuit; the comparison voltage generation circuit is used for providing comparison threshold voltage required by judgment and inputting the comparison threshold voltage into a negative input end of a differential comparator in the differential comparison circuit; the differential comparator circuit is used for collecting and judging whether signals are effective or not, the positive input end of the differential comparator is connected with a corresponding signal cable, and the output end of the differential comparator is connected to the FPGA chip; the FPGA chip is used for monitoring the signals output by the differential comparator and recording the number of the corresponding acquisition channel and the arrival time of the signals.
Preferably, the comparison voltage generating circuit includes a sliding rheostat, a second amplifier, a sixth resistor R6 and a seventh resistor R7;
one end of the slide rheostat is connected with a reference voltage VREF, one end of the slide rheostat is connected with a signal ground GND, and the slide end of the slide rheostat is connected with the positive input end of the second amplifier; the negative input end of the second amplifier is connected with a signal ground GND through a sixth resistor R6 and is connected with the output end through a seventh resistor R7; and the output end of the second amplifier is connected with the negative input end of a differential comparator in the differential comparison circuit.
Preferably, the differential comparison circuit comprises a bidirectional regulator tube D, a sixth capacitor C6, an eighth resistor R8, a ninth resistor R9 and a differential comparator;
the signal cable is connected with a signal ground GND through the bidirectional voltage regulator tube D, connected with the signal ground GND through a ninth resistor R9 and connected with the positive input end of the differential comparator through an eighth resistor R8 and a sixth capacitor C6.
Preferably, the comparison threshold voltage is set according to the oscilloscope detection amplitude voltage corresponding to the single pulse laser, and the comparison threshold voltage is not less than 2/3 of the oscilloscope detection amplitude voltage corresponding to the single pulse laser.
The invention also provides a method for measuring the flash time of the pulse laser, which is realized by adopting the device as described in any one of the above steps, and comprises the following steps:
s1, correspondingly arranging each laser light-receiving head of the receiving array at the light-emitting port of each pulse laser;
s2, measuring and recording the flash time of each pulse laser.
The technical scheme of the invention has the following advantages: the invention provides a device and a method for measuring the flash time of pulse laser, which adopts a plurality of laser light-receiving heads to respectively obtain scattered light when corresponding pulse lasers generate laser so as to transmit optical fiber long-line transmission signals, and finally realizes the flash time measurement of each pulse laser through photoelectric conversion and real-time acquisition. The invention collects and uniformly measures a plurality of pulse lasers in a distributed manner, has the advantages of high timing resolution, strong anti-interference, high precision, simple structure and low cost, and is particularly suitable for high-precision measurement of the imaging time of a multi-laser photographic system of the flight path of a high-speed flying object.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for measuring a flash time of a pulsed laser according to an embodiment of the present invention;
fig. 2 is a schematic view of a laser light receiving structure according to an embodiment of the invention;
FIG. 3 is a schematic circuit diagram of a photodetector in an embodiment of the invention;
FIG. 4 is a schematic circuit diagram of a comparison voltage generation circuit according to an embodiment of the present invention;
fig. 5 is a circuit schematic of a differential comparator circuit in an embodiment of the invention.
In the figure: 1: receiving an array; 2: a transmission fiber group; 3: a detector array; 4: a signal cable group; 5: collecting a plate; 6: a USB or Ethernet line; 7: an upper computer;
8: an arc-shaped receiving member; 9: connecting the fixed sections; 10: an optical fiber interface;
11: a photodiode; 12: a first amplifier; 13: a slide rheostat; 14: a second amplifier; 15: a differential comparator.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, an apparatus for measuring a flash time of a pulsed laser according to an embodiment of the present invention is suitable for a sequential flash time centralized measurement of a plurality of pulsed lasers, and includes a receiving array 1, a detector array 3, an acquisition board 5, and an upper computer 7. Specifically, wherein:
the receiving array 1 comprises a plurality of laser light receiving heads, and each laser light receiving head corresponds to one pulse laser. The pulsed lasers may be laid out in the ballistic direction as desired, and the receiving array 1 may take a rectangular or linear form. Each laser light-receiving head is arranged on one side of the light outlet of the corresponding pulse laser and is used for receiving scattered light of laser light generated by the corresponding pulse laser so as to detect the flash time of the pulse laser.
The detector array 3 includes a plurality of photodetectors, each of which corresponds to one of the laser light-receiving heads, and the number of photodetectors is the same as that of the laser light-receiving heads. Each laser light receiving head is connected to a corresponding photoelectric detector through a transmission optical fiber, the number of the transmission optical fibers is the same as that of the laser light receiving heads, each photoelectric detector is connected to the acquisition board 5 through a signal cable, and the number of the signal cables is the same as that of the photoelectric detectors. The transmission optical fiber is used for transmitting optical signals to the photoelectric detector, the transmission optical fiber group 2 is formed by a plurality of transmission optical fibers, the length of the transmission optical fiber can reach hundreds of meters, the signals are transmitted in a long distance in an optical mode through the transmission optical fiber, each pulse laser corresponds to one transmission optical fiber, the loss of the signals in a long-line transmission process can be reduced, the introduction of interference is avoided, and the detection precision is improved. The photodetector is used to convert the received optical signal into an electrical signal and transmit it to the acquisition board 5 for further processing. It should be noted that, in order to reduce the influence of the signal cables, the photodetectors should be disposed close to the collecting plate 5 to reduce the length of the signal cables, and each signal cable constitutes the signal cable group 4.
The acquisition board 5 is provided with a corresponding circuit for receiving and recording the flash time of each pulse laser and transmitting the recording result to the upper computer 7. Through the upper computer 7, the serial flash time data can be stored for a long time, the data are further processed, and the functions of parameter configuration, data return display and the like are realized. The acquisition board 5 and the upper computer 7 can be connected through a USB or Ethernet cable 6.
Preferably, as shown in fig. 2, each laser light receiving head in the receiving array 1 includes an arc-shaped receiving part 8, a connection fixing segment 9 and a fiber interface 10. The curved receiving member 8 has a light-transmitting curved surface for receiving light and converging the light to the middle of the optical fiber interface 10, that is, the converging focus of the curved surface is located at the middle of the optical fiber interface 10 and is flush with the end surface of the (inserted) transmission optical fiber. The curved receiving member 8 may employ a convex lens as in the prior art. The optical fiber interface 10 has a hollow socket for inserting and connecting the end of the corresponding transmission optical fiber, and the connection fixing section 9 is used for connecting the arc-shaped receiving part 8 and the optical fiber interface 10 and is fixedly arranged at the light outlet of the corresponding pulse laser. The connection securing section 9 may be provided with external connection threads for secure connection.
When the laser receiver is used, the laser light receiving head is fixed on a corresponding support through the connecting and fixing section 9, one end of the transmission optical fiber is inserted into the optical fiber interface 10, when external laser irradiates on the arc-shaped surface of the arc-shaped receiving part 8, the arc-shaped receiving part 8 converges scattered light of a corresponding pulse laser into the transmission optical fiber, so that the laser can be transmitted inside the transmission optical fiber, and the laser can be input into a corresponding photoelectric detector through the other end of the transmission optical fiber. Further, in order to improve the transmission efficiency and ensure the transmission precision, each transmission fiber in the transmission fiber group 2 adopts a multimode fiber, and the diameter of a single transmission fiber is not less than 125 μm.
Preferably, in the detector array 3, each of the photodetectors comprises a photodiode 11, and the photodiode 11 is in a reverse-biased state, i.e., in a high-speed conversion mode. Due to the fact that a reverse bias mode is adopted on the circuit, the photoelectric conversion rising time of the photodiode 11 can reach 1 nanosecond.
Further, as shown in fig. 3, the photodetector further includes a first amplifier 12, first to fourth resistors R1 to R4, and first to fifth capacitors C1 to C5. Specifically, wherein:
the P-pole of the photodiode 11 is connected to the analog ground AGND through the first resistor R1, the P-pole of the photodiode 11 is further connected to the positive input terminal IN + of the first amplifier 12 through the third resistor R3, the PAD terminal of the photodiode 11 is connected to the analog ground AGND, the N-pole of the photodiode 11 is connected to the positive input voltage + VS through the fourth resistor R4, and the N-pole of the photodiode 11 is further connected to the analog ground AGND through the third capacitor C3.
The negative input IN-of the first amplifier 12 is connected via a second resistor R2 to an analog ground AGND. The positive power supply terminal VCC of the first amplifier 12 is connected to the positive input voltage + VS, and is connected to the analog ground AGND through a first capacitor C1 and a second capacitor C2 connected in parallel, wherein the second capacitor C2 is an active capacitor, and the positive electrode of the second capacitor C2 is connected to the positive input voltage + VS. The negative supply terminal VEE of the first amplifier 12 is connected to the negative input voltage-VS, and is connected to the analog ground AGND through a fourth capacitor C4 and a fifth capacitor C5 connected in parallel, wherein the fifth capacitor C5 is an active capacitor, and the anode of the fifth capacitor C5 is connected to the analog ground AGND. The output OUT of the first amplifier 12 is connected to the acquisition board 5 by a corresponding signal cable.
Further, the photodiode 11 is in reverse bias of +12V dc voltage, that is, the positive input voltage + VS is +12V, the negative input voltage-VS is-12V, the resistance of the first resistor R1 is preferably 5.1k Ω, the resistance of the second resistor R2 is preferably 51 Ω, the resistance of the third resistor R3 is preferably 200 Ω, the resistance of the fourth resistor R4 is preferably 15k Ω, the capacitance of the first capacitor C1, the capacitance of the third capacitor C3 and the capacitance of the fourth capacitor C4 is preferably 0.1 μ F, the capacitance of the second capacitor C2 and the capacitance of the fifth capacitor C5 are preferably 22 μ F/25V, and the model of the first amplifier 12 can be selected as AD 844.
When laser is transmitted to a single photodetector through a transmission optical fiber, a photodiode 11 inside the photodetector receives a flash time signal and converts the light form signal into an electric signal, and the electric signal is amplified by a first amplifier 12 and then transmitted to the acquisition board 5 through a signal cable.
Preferably, the acquisition board 5 includes an FPGA chip and a plurality of acquisition channels, each acquisition channel corresponds to a signal cable, and the acquisition channels are configured to receive flash time signals of the corresponding pulse laser, determine whether the flash time signals are valid, and input the flash time signals into the FPGA chip for recording.
Each acquisition channel comprises a comparison voltage generation circuit and a differential comparison circuit, wherein the comparison voltage generation circuit is used for providing comparison threshold voltage required by judgment and inputting the comparison threshold voltage to the negative input end of a differential comparator 15 in the differential comparison circuit. The differential comparator circuit is used for collecting and judging whether the arriving signals are valid or not, the positive input end of the differential comparator 15 is connected with the corresponding signal cable, and the output end of the differential comparator 15 is connected with the FPGA chip. The FPGA chip is used to monitor the (valid) signal output by the output of the differential comparator 15, and record the number of the corresponding acquisition channel and the arrival time of the signal.
Further, as shown in fig. 4, in the acquisition channel, the comparison voltage generation circuit includes a sliding rheostat 13, a second amplifier 14, a sixth resistor R6 and a seventh resistor R7. One end of the sliding rheostat 13 is connected to the reference voltage VREF, the other end is connected to the signal ground GND, and the sliding end is connected to the positive input end of the second amplifier 14. The negative input of the second amplifier 14 is connected via a sixth resistor R6 to the signal ground GND and via a seventh resistor R7 to the output. The output of the second amplifier 14 is connected to the negative input of the differential comparator 15 of the differential comparator circuit, which outputs the comparison threshold voltage (i.e., signal SENSOR _ REF 0). Further, the reference voltage VREF is preferably 4V, the total resistance of the sliding rheostat 13 is preferably 10k Ω, the model of the second amplifier 14 is selected from SGM8522, the sixth resistor R6 is preferably not soldered, and the seventh resistor R7 is preferably 0R. By adjusting the sliding rheostat 13, the pull-up voltage into the second amplifier 14 is adjusted, thereby generating a comparison threshold voltage that is eventually transmitted to the negative input of the differential comparator 15 in fig. 5.
In particular, the comparison threshold voltage may be specifically set according to an oscilloscope probe amplitude voltage corresponding to a single pulse laser. When the static debugging is carried out, the amplitude voltage of the electric signal output by the corresponding photoelectric detector is obtained by the oscilloscope when the single pulse laser generates the laser, and the comparison threshold voltage is not less than 2/3 of the detection amplitude voltage of the oscilloscope corresponding to the single pulse laser. By using the comparison voltage generating circuit and the differential comparison circuit, valid/invalid signals can be screened quickly, and the deviation between the recorded flash time and the actual flash time is reduced.
Further, in the acquisition channel, the differential comparison circuit includes a bidirectional regulator D, a sixth capacitor C6, an eighth resistor R8, a ninth resistor R9, and a differential comparator 15. Fig. 5 shows a single differential comparison circuit, which is located at the front end of the acquisition board 5 and functions to convert the electrical signals transmitted by the signal cable into port signals that can be recognized by the acquisition board 5. As shown in fig. 5, a corresponding signal cable is connected to one of the sampling channels of the sampling board 5, the signal cable is connected to the signal ground GND through the bidirectional regulator D, connected to the signal ground GND through the ninth resistor R9, and connected to the positive input terminal of the differential comparator 15 through the eighth resistor R8 and the sixth capacitor C6. The output end of the second amplifier 14 is connected to the negative input end of the differential comparator 15 in the differential comparison circuit, and the comparison threshold voltage is used as a judgment basis, when the voltage value of the electrical signal generated by the photodetector corresponding to the signal cable is higher than the comparison threshold voltage, the signal generated by the photodetector is an effective signal, and the flash of the corresponding pulse laser is an effective flash. Furthermore, the model of the differential comparator 15 can be selected as ADCMP604, the bidirectional regulator D can be selected as not soldered, the resistance of the ninth resistor R9 is preferably 44.9 Ω, the resistance of the eighth resistor R8 is preferably 0 Ω, the sixth capacitor C6 is preferably not soldered, and the sixth capacitor C6 is provided for filtering and is not soldered in general.
The output end of the differential comparator 15 is connected to the FPGA chip, and the two output high and low signals (i.e., signals LVDS0_ P and LVDS0_ N) enter two pins of the FPGA chip, and the FPGA chip keeps monitoring states of the two pins, and records the number of the channel and the time when the signal reaches after receiving the high and low signals. The flash time intervals of a plurality of external pulse lasers can be obtained by determining the signal arrival conditions of all channels, and finally the flash time intervals can be transmitted to an upper computer 7 through a USB or Ethernet line 6 to display flash time data and states.
The FPGA chip is used as a signal acquisition processor and is embedded with a corresponding algorithm, and the algorithm comprises a channel level state monitoring algorithm and a channel trigger time judging algorithm. Each channel of the FPGA chip corresponds to the photoelectric detector at the front end one by one, and monitoring is carried out all the time, and the arrival time of effective signals is recorded. The principle of the channel level state monitoring algorithm is as follows: the high-low signal transmitted by the differential comparator 15 corresponds to two pins of the FPGA chip, and when the pin corresponds to the positive input end of the differential comparator 15 and is at a high level and the negative input end is at a low level, the corresponding channel is considered to be valid, and valid acquisition is performed. The principle of the channel trigger time judgment algorithm is as follows: the whole FPGA chip works under the high-precision time reference, each channel adopts a parallel acquisition mode, and when corresponding channels are effectively acquired, acquisition time corresponding to the channels is stored in the acquisition board 5 and uploaded to the upper computer 7, so that the function of recording flash time of each pulse laser is realized. By using a time frequency stability of 10-9The high-precision time reference ensures the precision of each recording moment and can meet the application requirement of flash detection on the ballistic target.
Preferably, the acquisition board 5 waits for an external trigger signal sent by the upper computer 7, and starts timing monitoring or real-time monitoring after receiving the external trigger signal.
The invention also provides a method for measuring the flash time of the pulse laser, which is realized by adopting the device for measuring the flash time of the pulse laser in any one of the above embodiments, and the method comprises the following steps:
s1, correspondingly arranging each laser light-receiving head of the receiving array at the light-emitting port of each pulse laser;
s2, measuring and recording the flash time of each pulse laser.
Preferably, step S1 further includes setting a comparison threshold voltage according to the oscilloscope detected amplitude voltage corresponding to the single pulse laser, where the comparison threshold voltage is not less than 2/3 of the oscilloscope detected amplitude voltage corresponding to the single pulse laser.
Further, step S2 includes that three signal acquisitions can be performed for each acquisition channel, so as to record the time information of the last three flashes of the corresponding pulse laser.
The light-emitting principle of the (high-power pump) pulse laser is that the Q-switched light is turned on first and then is switched on, and the Q-switched light is laser. The white light is generated during lighting, and the switch is turned on during Q-switching to release the laser to generate laser beam, so that the photoelectric detector usually detects two light pulses, and the time difference between the two light pulses is a fixed value. For the first white light pulse, the light pulse can be reduced by adding a light filter or an attenuation sheet and the like on the light path, but in the invention, the generation moments of the two light pulses can be collected and recorded by directly capturing three times of flash signals, and even if the light filter or the attenuation sheet is added, effective Q-switched laser beam signals can be collected. Meanwhile, the reason for leaving 1 more signal acquisition is redundancy backup. This approach may meet the requirements of flash detection applications on ballistic targets.
In summary, the invention provides a device and a method for measuring the flash time of a pulse laser, which can realize high-precision measurement of the multi-sequence flash time of the pulse laser, especially the flash time of the multi-pulse laser, the timing resolution can meet less than 100 nanoseconds, the timing length can reach 1 second, and the device and the method can be applied to flash detection on a ballistic target.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. An apparatus for measuring a pulse laser flash time, comprising:
the system comprises a receiving array, a detector array, an acquisition board and an upper computer; wherein the content of the first and second substances,
the receiving array comprises a plurality of laser light-receiving heads, each laser light-receiving head corresponds to one pulse laser, and the laser light-receiving heads are arranged on one side of the light outlet of the corresponding pulse laser and used for receiving scattered light of laser light generated by the pulse laser;
the detector array comprises a plurality of photoelectric detectors, each photoelectric detector corresponds to one laser light-receiving head, each laser light-receiving head is respectively connected to the corresponding photoelectric detector through a transmission optical fiber, and each photoelectric detector is respectively connected to the acquisition board through a signal cable;
the acquisition board is used for receiving and recording the flashing time of each pulse laser and transmitting the recording result to the upper computer.
2. The apparatus for measuring a flash time of a pulsed laser according to claim 1, characterized in that:
the laser light receiving head comprises an arc receiving piece, a connecting and fixing section and an optical fiber interface; wherein the content of the first and second substances,
the arc receives the piece and has a non-light tight arcwall face for receive light and assemble light extremely the middle part of fiber interface, fiber interface has hollow socket for connect corresponding transmission optical fiber's tip, connect the canned paragraph and be used for connecting the arc receive the piece with fiber interface to the fixed setting is corresponding pulse laser's light-emitting port department.
3. The apparatus for measuring a flash time of a pulsed laser according to claim 1, characterized in that:
the transmission optical fiber adopts a multimode optical fiber, and the diameter of the transmission optical fiber is not less than 125 mu m.
4. The apparatus for measuring a flash time of a pulsed laser according to claim 1, characterized in that:
the photodetector includes a photodiode, which is in a reverse-biased state.
5. The apparatus for measuring a flash time of a pulsed laser according to claim 4, wherein:
the photodetector further includes a first amplifier, first to fourth resistors R1 to R4, and first to fifth capacitors C1 to C5; wherein the content of the first and second substances,
the P pole of the photodiode is connected with an analog ground AGND through a first resistor R1, and is connected with the positive input end IN + of the first amplifier through a third resistor R3, the PAD end of the photodiode is connected with an analog ground AGND, the N pole of the photodiode is connected with a positive input voltage through a fourth resistor R4, and is connected with the analog ground AGND through a third capacitor C3;
the negative input end IN-of the first amplifier is connected with an analog ground AGND through a second resistor R2;
the positive power supply end VCC of the first amplifier is connected with a positive input voltage, and is connected with an analog ground AGND through a first capacitor C1 and a second capacitor C2 which are connected in parallel, wherein the second capacitor C2 is an active capacitor, and the positive electrode of the second capacitor C2 is connected with the positive input voltage;
the negative power supply terminal VEE of the first amplifier is connected with a negative input voltage and is connected with an analog ground AGND through a fourth capacitor C4 and a fifth capacitor C5 which are connected in parallel, wherein the fifth capacitor C5 is an active capacitor, and the anode of the fifth capacitor is connected with the analog ground AGND;
the output OUT of the first amplifier is connected to the acquisition board by a corresponding signal cable.
6. The apparatus for measuring a flash time of a pulsed laser according to claim 1, characterized in that:
the acquisition board comprises an FPGA chip and a plurality of acquisition channels, and each acquisition channel corresponds to one signal cable;
the acquisition channel comprises a comparison voltage generation circuit and a differential comparison circuit; the comparison voltage generation circuit is used for providing comparison threshold voltage required by judgment and inputting the comparison threshold voltage into a negative input end of a differential comparator in the differential comparison circuit; the differential comparator circuit is used for collecting and judging whether signals are effective or not, the positive input end of the differential comparator is connected with a corresponding signal cable, and the output end of the differential comparator is connected to the FPGA chip; the FPGA chip is used for monitoring the signals output by the differential comparator and recording the number of the corresponding acquisition channel and the arrival time of the signals.
7. The apparatus for measuring a flash time of a pulsed laser according to claim 6, wherein:
the comparison voltage generating circuit comprises a slide rheostat, a second amplifier, a sixth resistor R6 and a seventh resistor R7;
one end of the slide rheostat is connected with a reference voltage VREF, one end of the slide rheostat is connected with a signal ground GND, and the slide end of the slide rheostat is connected with the positive input end of the second amplifier; the negative input end of the second amplifier is connected with a signal ground GND through a sixth resistor R6 and is connected with the output end through a seventh resistor R7; and the output end of the second amplifier is connected with the negative input end of a differential comparator in the differential comparison circuit.
8. The apparatus for measuring a flash time of a pulsed laser according to claim 7, wherein:
the differential comparison circuit comprises a bidirectional voltage regulator tube D, a sixth capacitor C6, an eighth resistor R8, a ninth resistor R9 and a differential comparator;
the signal cable is connected with a signal ground GND through the bidirectional voltage regulator tube D, connected with the signal ground GND through a ninth resistor R9 and connected with the positive input end of the differential comparator through an eighth resistor R8 and a sixth capacitor C6.
9. The apparatus for measuring a flash time of a pulsed laser according to claim 6, wherein:
the comparison threshold voltage is set according to the oscilloscope detection amplitude voltage corresponding to the single pulse laser, and the comparison threshold voltage is not less than 2/3 of the oscilloscope detection amplitude voltage corresponding to the single pulse laser.
10. A method for measuring a pulsed laser flash time, characterized by: implemented with the apparatus of any one of claims 1-9, comprising the steps of:
s1, correspondingly arranging each laser light-receiving head of the receiving array at the light-emitting port of each pulse laser;
s2, measuring and recording the flash time of each pulse laser.
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