Four-quadrant detector signal acquisition conditioning circuit

Abstract

The invention relates to the technical field of laser detection, and provides a four-quadrant detector signal acquisition conditioning circuit, which is used for high repetition frequency narrow pulse width laser spot position detection, and comprises a multi-channel integrated amplification circuit, a pulse detection and holding circuit, an analog-to-digital conversion circuit, a high-speed addition and comparison circuit and a control circuit, wherein the multi-channel integrated amplification circuit is connected with the pulse detection and holding circuit; the pulse detection and holding circuit is respectively connected with the analog-to-digital conversion circuit, the high-speed addition and comparison circuit and the control circuit; the analog-to-digital conversion circuit and the high-speed addition and comparison circuit are respectively connected with the control circuit; wherein the passband bandwidths of the multi-channel integrated amplification circuit, the pulse detection and holding circuit, the analog-to-digital conversion circuit, the high-speed addition and comparison circuit and the control circuit are all greater than the bandwidth of the laser pulse signal, so that the waveform of the laser narrow pulse width signal is not distorted in the transmission process.

Description

Technical Field

[0001] The present application relates to the field of laser detection technology, and in particular to a four-quadrant detector signal acquisition and conditioning circuit. Background Art

[0002] Laser spot position detection technology has received extensive attention in modern technology and scientific research, and plays an important role in laser guidance, free space communication, precision measurement, optical tweezers and other fields. The selection of a suitable photoelectric position detector is the basis for achieving wide-range, real-time and accurate measurement of the laser spot position. Commonly used photoelectric position detectors are mainly: position sensitive detectors PSD (Position Sensitive Detector), charge coupled devices CCD (Charge Couple Device) and four-quadrant detectors 4-QD (Quadrant Detector) three categories. Compared with PSD and CCD detectors, the four-quadrant detector has the advantages of high position resolution, short response time, wide wavelength response, etc., and is suitable for high repetition frequency and high-precision laser spot position measurement.

[0003] When using a four-quadrant detector to detect the position of a high-repetition-rate (above kHz) and narrow-pulse-width (tens of ns) laser, the charge generated by each channel of the four-quadrant detector is output as four narrow-pulse-width voltage signals of the same frequency after passing through the back-end transimpedance amplifier circuit. How to achieve synchronous and accurate collection and conditioning of the four narrow-pulse-width electrical signals is an urgent problem to be solved in order to achieve real-time and high-precision detection of the high-repetition-rate, narrow-pulse-width laser spot position. Summary of the invention

[0004] Some embodiments of the present application provide a four-quadrant detector signal acquisition and conditioning circuit for high repetition rate narrow pulse width laser spot position detection, including:

[0005] A multi-channel integrated amplifier circuit, a pulse detection and holding circuit, an analog-to-digital conversion circuit, a high-speed addition and comparison circuit, and a control circuit; wherein the multi-channel integrated amplifier circuit is connected to the pulse detection and holding circuit; the pulse detection and holding circuit is respectively connected to the analog-to-digital conversion circuit, the high-speed addition and comparison circuit, and the control circuit; the analog-to-digital conversion circuit and the high-speed addition and comparison circuit are respectively connected to the control circuit;

[0006] The multi-channel integrated amplifier circuit is configured to amplify multi-channel input signals;

[0007] The pulse detection and holding circuit is configured to perform pulse detection on an input signal and to perform high-speed transient holding on the input signal based on a control signal of the control circuit;

[0008] The analog-to-digital conversion circuit is configured to perform analog-to-digital conversion on the received high-speed transient hold signal and transmit the converted digital signal to the control circuit;

[0009] The high-speed addition and comparison circuit is configured to accumulate the pulse signal of the pulse detection and holding circuit and output an interrupt signal to the control circuit;

[0010] The control circuit is configured to control the pulse detection and holding circuit to perform high-speed transient holding based on the interrupt signal;

[0011] Among them, the passband bandwidth of the multi-channel integrated amplifier circuit, the pulse detection and holding circuit, the analog-to-digital conversion circuit, the high-speed addition and comparison circuit and the control circuit are all greater than the laser pulse signal bandwidth, so that the waveform of the laser narrow pulse width signal is not distorted during transmission.

[0012] In some embodiments, it also includes: a four-quadrant detector, which includes four transimpedance amplifiers arranged in four quadrant areas, and the four transimpedance amplifiers convert the generated charge into voltage signals and input them into the input interface of the multi-channel integrated amplifier circuit respectively.

[0013] In some embodiments, the four input terminals of the pulse detection and holding circuit are respectively connected to the four output terminals of the multi-channel integrated amplifier circuit, and the pulse detection and holding circuit has a control pin. In response to the high level of the control pin, the pulse detection and holding circuit output follows the input signal in real time. In response to the low level of the control pin, the pulse detection and holding circuit outputs a high-speed transient holding signal for the input signal.

[0014] In some embodiments, the four input terminals of the high-speed addition and comparison circuit are respectively connected to the four output terminals of the pulse detection and holding circuit, and are configured to accumulate and sum the voltage signals input from the four input terminals, and compare the accumulated voltage with a threshold voltage. When the accumulated voltage is greater than the threshold voltage, an interrupt signal is output.

[0015] In some embodiments, the control circuit is configured to control the control pin to be low level in response to an interrupt signal of the high-speed addition and comparison circuit, so that the pulse detection and holding circuit outputs a high-speed transient holding signal for the input signal.

[0016] In some embodiments, the four input terminals of the analog-to-digital conversion circuit are respectively connected to the four output terminals of the pulse detection and holding circuit, and the analog-to-digital conversion circuit has a start pin. The analog-to-digital conversion circuit is configured to respond to the high level of the start pin. The analog-to-digital conversion circuit extracts the high-speed transient holding signal of the pulse detection and holding circuit and performs analog-to-digital conversion.

[0017] In some embodiments, the analog-to-digital conversion circuit also has a switch pin, and the analog-to-digital conversion circuit is configured to respond to a switch signal of the switch pin, and the control circuit reads the analog-to-digital converted data signal from the analog-to-digital conversion circuit, and the data signal is used to calculate the spot position.

[0018] In some embodiments, the control circuit is connected to the high-speed addition and comparison circuit via a digital-to-analog conversion chip, and the control circuit provides the threshold voltage to the high-speed addition and comparison circuit via the digital-to-analog conversion chip.

[0019] In some embodiments, the high-speed addition and comparison circuit includes a first integrated operational amplifier chip, a second integrated operational amplifier chip, a comparator chip, and a level conversion chip connected in sequence.

[0020] In some embodiments, the pulse detection and holding circuit includes four parallel-connected follower and hold chips, whose input ends are respectively connected to four output ends of the multi-channel integrated amplifier circuit.

[0021] Compared with the related art, the above solution of the embodiment of the present application has at least the following beneficial effects:

[0022] The present application provides a four-quadrant detector signal acquisition and conditioning circuit for high repetition rate narrow pulse width laser spot position detection, which solves the technical problem of synchronous and accurate acquisition and conditioning of four-way high repetition rate and narrow pulse width electrical signals output by the four-quadrant detector after the charge of each channel passes through the back-end transimpedance amplifier circuit when using the four-quadrant detector to detect the position of high repetition rate (above kHz) and narrow pulse width (tens of ns level) lasers. Compared with the multi-channel high-speed data acquisition circuit solution, the present application has the advantages of simple circuit principle and low implementation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0024] Figure 1 A schematic diagram of the circuit structure of a four-quadrant detector signal acquisition and conditioning circuit provided in some embodiments of the present application;

[0025] Figure 2 A schematic diagram of the circuit structure of a high-speed addition and comparison circuit provided in some embodiments of the present application;

[0026] Figure 3Images of experimental detection results provided for some embodiments of the present application.

[0027] Description of reference numerals:

[0028] Four-quadrant detector 100, multi-channel integrated amplifier circuit 20, pulse detection and holding circuit 30, analog-to-digital conversion circuit 40, high-speed addition and comparison circuit 50, control circuit 60, first integrated operational amplifier chip 51, second integrated operational amplifier chip 52, comparator chip 53, level conversion chip 54. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0030] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0031] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0032] It should be understood that although the terms first, second, third, etc. may be used to describe in the embodiments of the present application, these should not be limited to these terms. These terms are only used to distinguish. For example, without departing from the scope of the embodiments of the present application, the first may also be referred to as the second, and similarly, the second may also be referred to as the first.

[0033] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such product or device. In the absence of more restrictions, the elements defined by the sentence "comprises a" do not exclude the presence of other identical elements in the product or device including the elements.

[0034] The present application is described in detail below with reference to the accompanying drawings.

[0035] like Figure 1 As shown, some embodiments of the present application provide a four-quadrant detector signal acquisition and conditioning circuit for high repetition rate narrow pulse width laser spot position detection, the four-quadrant detector signal acquisition and conditioning circuit comprising: a multi-channel integrated amplifier circuit 20, a pulse detection and holding circuit 30, an analog-to-digital conversion circuit 40, a high-speed addition and comparison circuit 50 and a control circuit 60; wherein the multi-channel integrated amplifier circuit 20 is connected to the pulse detection and holding circuit 30; the pulse detection and holding circuit 30 is respectively connected to the analog-to-digital conversion circuit 40, the high-speed addition and comparison circuit 50 and the control circuit 60; the analog-to-digital conversion circuit 40 and the high-speed addition and comparison circuit 50 are respectively connected to the control circuit 60; the multi-channel integrated amplifier circuit 20 is configured to amplify a multi-channel input signal; the pulse detection and holding circuit 30 is configured to perform pulse detection on the input signal The analog-to-digital conversion circuit 40 is configured to perform analog-to-digital conversion on the received high-speed transient holding signal, and transmit the converted digital signal to the control circuit 60; the high-speed addition and comparison circuit 50 is configured to accumulate the pulse signal of the pulse detection and holding circuit 30 and output an interrupt signal to the control circuit 60; the control circuit 60 is configured to control the pulse detection and holding circuit 30 to perform high-speed transient holding based on the interrupt signal; wherein the passband bandwidth of the multi-channel integrated amplifier circuit 20, the pulse detection and holding circuit 30, the analog-to-digital conversion circuit 40, the high-speed addition and comparison circuit 50 and the control circuit 60 are all greater than the laser pulse signal bandwidth, so that the waveform of the laser narrow pulse width signal is not distorted during the transmission process.

[0036] In some embodiments, Figure 1 As shown, the four-quadrant detector signal acquisition and conditioning circuit also includes a four-quadrant detector 100, and the four-quadrant detector 100 includes four transimpedance amplifiers arranged in four quadrant areas, for example, transimpedance amplifier A, transimpedance amplifier B, transimpedance amplifier C, and transimpedance amplifier D respectively correspond to collecting signals in four quadrant areas, and the four transimpedance amplifiers convert the generated charge into voltage signals and input them into the input interfaces of the multi-channel integrated amplifier circuit 20 respectively.

[0037] In the four-quadrant detector signal acquisition and conditioning circuit, the four-way transimpedance amplifier circuit integrated inside the four-quadrant detector 100 converts the charge generated by the laser signal detected in each quadrant into a voltage signal, and then further amplifies each signal through the multi-channel integrated amplifier circuit 20; the amplified pulse signal passes through the pulse detection and holding circuit 30 and the high-speed addition and comparison circuit 50 respectively, and the control circuit 60 controls the DA chip to output a corresponding slightly lower voltage value as the negative terminal threshold voltage of the high-speed addition and comparison circuit 50 according to the voltage value after the four-way signal is accumulated; when the detection When the accumulated voltage value of the four-way detection signal exceeds the threshold, the pulse signal output by the high-speed addition and comparison circuit 50 enters the control circuit 60 as an interrupt signal. After the control circuit 60 responds to the interrupt, the four-way pulse signal is maintained through the pulse detection and holding circuit 30, and at the same time, the multi-channel analog-to-digital conversion circuit 40 starts to collect and convert the pulse peak holding signal voltage value at the front end; when the control circuit 60 detects that the analog-to-digital conversion circuit 40 has completed the conversion, the control pulse detection and holding circuit 30 is controlled to discharge the stored charge and start to maintain and extract the peak value of the next pulse signal. The control circuit 60 realizes real-time detection of the high repetition rate and narrow pulse width laser spot position based on the read output values ​​of the four-way signal of the analog-to-digital conversion circuit 40 and the spot position detection algorithm.

[0038] The circuit structure of the present application solves the technical problem of synchronously and accurately collecting and conditioning the four-channel high-repetition-rate and narrow-pulse-width electrical signals output by the four-quadrant detector after the charges of each channel of the four-quadrant detector pass through the back-end transimpedance amplifier circuit when the four-quadrant detector is used to detect the position of a high-repetition-rate (above kHz) and narrow-pulse-width (tens of ns) laser. Compared with the multi-channel high-speed data acquisition circuit solution, the present application has the advantages of simple circuit principle and low implementation cost.

[0039] In some embodiments, the four input terminals of the pulse detection and holding circuit 30 are respectively connected to the four output terminals of the multi-channel integrated amplifier circuit 20, and the pulse detection and holding circuit 30 has a control pin. In response to the high level of the control pin, the pulse detection and holding circuit 30 outputs a real-time follow-up input signal, and in response to the low level of the control pin, the pulse detection and holding circuit 30 outputs a high-speed transient holding signal for the input signal. In some embodiments, the four input terminals of the high-speed addition and comparison circuit 50 are respectively connected to the four output terminals of the pulse detection and holding circuit 30, and are configured to accumulate and sum the voltage signals input from the four input terminals, and compare the accumulated and summed voltage with the threshold voltage, and output an interrupt signal when the accumulated and summed voltage is greater than the threshold voltage. In some embodiments, the control circuit 60 is configured to control the control pin to be low level in response to the interrupt signal of the high-speed addition and comparison circuit 50, so that the pulse detection and holding circuit 30 outputs a high-speed transient holding signal for the input signal.

[0040] like Figure 1 As shown, when the high repetition rate, narrow pulse width laser is incident on the four-quadrant detector 100 after beam splitting, attenuation and focusing, the transimpedance amplifier circuit integrated inside the four-quadrant detector 100 converts the charge generated in each quadrant into a voltage signal; the multi-channel integrated amplifier circuit 20 can use the AD8004 four-way integrated operational amplifier chip of ADI Company, connect the four-way pulse voltage signals at the back end of the four-quadrant detector 100 to the four-way input channels Vin1-Vin4 of AD8004 for synchronous amplification and conditioning, and then output the four-way output signals Vout1-Vout4 of AD8004 to the pulse detection and holding circuit 30 and the high-speed addition and comparison circuit 50 respectively.

[0041] In some embodiments, the pulse detection and holding circuit 30 includes four parallel-connected follower and holding chips, whose input terminals are respectively connected to the four output terminals of the multi-channel integrated amplifier circuit 20 .

[0042] Specifically, Figure 1 As shown, in the pulse detection and holding circuit 30, four OP615 chips of TI can be selected to achieve the following and holding of the four pulse voltage signals output by the AD8004 chip in the multi-channel integrated amplifier circuit 20, and the four output signals of the AD8004 chip are respectively connected to the 10 pins (S / H In+) of the four OP615 chips, and the 2 pins (Emitter) of each OP615 chip are respectively connected to the input VIN- pin of the first AD8001 chip in the high-speed addition and comparison circuit 50. The GPIO pin of the DSP chip in the control circuit 60 is connected to pin 7 (control pin HoldControl) of the OP615 chip. When the high-speed addition and comparison circuit 50 does not generate a trigger interrupt to the DSP chip, the GPIO of the DSP chip corresponding to the pin 7 (control pin Hold Control) of the OP615 chip is configured to a high level by default, and the output of the OP615 chip follows the input signal in real time; when the high-speed addition and comparison circuit generates a trigger interrupt to the DSP chip, the GPIO of the DSP chip corresponding to the pin 7 (control pin Hold Control) of the OP615 chip is configured to a low level, and the output end of the OP615 chip realizes high-speed transient hold of the input signal.

[0043] In some embodiments, Figure 2 As shown, the high-speed addition and comparison circuit 50 includes a first integrated operational amplifier chip 51, a second integrated operational amplifier chip 52, a comparator chip 53 and a level conversion chip 54 which are connected in sequence.

[0044] In the high-speed addition and comparison circuit 50, a first integrated operational amplifier chip 51 is first selected, such as the AD8001 integrated operational amplifier chip of ADI Company, to realize the accumulation and summation of the four output signals VOut1-VOut4 of AD8004, and then the output VOut of the first AD8001 chip is connected to the input VIN of the second AD8001 chip of ADI Company to realize the buffering and following of the accumulated signal; then the output VOUT of the second AD8001 chip is connected to the comparator chip 53, such as the high-speed comparator chip MAX9691, and the 2nd pin (IN+) of the MAX9691, and the 3rd pin (IN-) of the MAX9691 is connected to the DA0 pin of the digital-to-analog conversion chip DAC7724 in the control circuit 60; the output 5th pin of the comparator chip MAX9691 is connected to the DA0 pin of the digital-to-analog conversion chip DAC7724 in the control circuit 60; the output 5th pin of the comparator chip MAX9691 is connected to the DA0 pin of the digital-to-analog conversion chip DAC7724 in the control circuit 60. The 6 pins (Q) and 10 pins (Q) are connected to the level conversion chip 54, such as the 3 pin of the MC100ELT25 chip. The 2 pins (D) and 7 pin (Q) of the MC100ELT25 chip are connected to the XINT1 external interrupt pin of the control circuit DSP chip.

[0045] In some embodiments, the four input terminals of the analog-to-digital conversion circuit 40 are respectively connected to the four output terminals of the pulse detection and holding circuit 30, and the analog-to-digital conversion circuit 40 has a start pin. The analog-to-digital conversion circuit 40 is configured to respond to the high level of the start pin. The analog-to-digital conversion circuit 40 extracts the high-speed transient holding signal of the pulse detection and holding circuit 30 and performs analog-to-digital conversion.

[0046] In some embodiments, the analog-to-digital conversion circuit 40 also has a switch pin, and the analog-to-digital conversion circuit 40 is configured to respond to a switch signal of the switch pin, and the control circuit 60 reads the analog-to-digital converted data signal from the analog-to-digital conversion circuit 40, and the data signal is used to calculate the spot position.

[0047] like Figure 1 As shown, in the analog-to-digital conversion circuit 40, the multi-channel 16-bit digital-to-analog conversion chip AD7606 of ADI Company can be selected to realize the conversion of 4-way voltage analog signals into digital signals for data reading and spot position calculation of the DSP chip in the back-end control circuit 60. Among them, the V1, V2, V3, and V4 input channel pins of the AD7606 chip are respectively connected to the 2 pins (Emitter) of the four OP615 chips, the CONVST pin (start pin) is connected to the GPIO pin of the DSP chip, and the BUSY pin (switch pin) is connected to the XINT2 pin of the DSP chip.

[0048] In some embodiments, the control circuit 60 is connected to the high-speed addition and comparison circuit 50 through a digital-to-analog conversion chip, and the control circuit 60 provides the threshold voltage to the high-speed addition and comparison circuit 50 through the digital-to-analog conversion chip.

[0049] like Figure 1 As shown, in the control circuit 60, the TMS320F28335 microcontroller of TI can be selected to realize the main process control of the entire signal conditioning circuit. According to the voltage value after the accumulation of the four-way signal in the multi-channel integrated amplifier circuit 20, the DSP microprocessor controls the DA digital-to-analog conversion chip DAC7724 through the XINTF interface to output a corresponding slightly lower voltage value as the negative threshold voltage of the high-speed comparator MAX9691 in the high-speed addition and comparison circuit 50. The GPIO corresponding to the DSP chip connected to the 7th pin of the OP615 chip (control pin Hold Control) is configured as a high level by default, and the output of the OP615 chip follows the input signal in real time; when the high-speed addition and comparison circuit 50 generates a trigger interrupt to the DSP chip, the GPIO corresponding to the DSP chip connected to the 7th pin of the OP615 chip (control pin Hold Control) is configured as a low level, and the output end of the OP615 chip realizes high-speed transient hold of the input signal. Then the GPIO of the DSP chip corresponding to the CONVST pin of the AD7606 chip connected to the analog-to-digital conversion circuit is configured to a high level, and the AD7606 chip starts analog-to-digital conversion. When the XINT2 interrupt of the DSP chip connected to the BUSY pin of the AD7606 chip is triggered, it indicates that the analog-to-digital conversion of the AD7606 chip has been completed. The DSP chip reads the data value of the current output channel of the AD7606 chip and completes the collection of the output values ​​of each signal after the current laser pulse passes through the four-quadrant detector for subsequent spot position solution processing.

[0050] Experiments have shown that Figure 3 As shown, the four-quadrant detector signal acquisition and conditioning circuit of the present application is adopted, the yellow waveform of channel 1 is the narrow pulse width voltage signal output by the back-end transimpedance amplifier circuit after the narrow pulse width laser is incident on the four-quadrant detector 100; the green waveform of channel 2 is the voltage signal maintained by the narrow pulse width signal after passing through the pulse detection and holding circuit 3. It can be seen from the images obtained by the experiment that the pulse peak value extraction and maintenance of the narrow pulse width laser signal can be realized through the four-quadrant detector signal acquisition and conditioning circuit in the present application, so as to facilitate the synchronous acquisition of the control circuit 60, thereby achieving the purpose of synchronous and accurate acquisition and conditioning.

[0051] The present application provides a four-quadrant detector signal acquisition and conditioning circuit for high repetition rate narrow pulse width laser spot position detection, which solves the technical problem of synchronous and accurate acquisition and conditioning of four-way high repetition rate and narrow pulse width electrical signals output by the four-quadrant detector after the charge of each channel passes through the back-end transimpedance amplifier circuit when using the four-quadrant detector to detect the position of high repetition rate (above kHz) and narrow pulse width (tens of ns level) lasers. Compared with the multi-channel high-speed data acquisition circuit solution, the present application has the advantages of simple circuit principle and low implementation cost.

[0052] Finally, it should be noted that: each embodiment in this specification is described by way of example, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other. For the system or device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0053] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A four-quadrant detector signal acquisition and conditioning circuit for high repetition rate narrow pulse width laser spot position detection, characterized in that ,include: A multi-channel integrated amplifier circuit, a pulse detection and holding circuit, an analog-to-digital conversion circuit, a high-speed addition and comparison circuit, and a control circuit; wherein the multi-channel integrated amplifier circuit is connected to the pulse detection and holding circuit; the pulse detection and holding circuit is respectively connected to the analog-to-digital conversion circuit, the high-speed addition and comparison circuit, and the control circuit; the analog-to-digital conversion circuit and the high-speed addition and comparison circuit are respectively connected to the control circuit; The multi-channel integrated amplifier circuit is configured to amplify multi-channel input signals; The pulse detection and holding circuit is configured to perform pulse detection on an input signal and to perform high-speed transient holding on the input signal based on a control signal of the control circuit; The analog-to-digital conversion circuit is configured to perform analog-to-digital conversion on the received high-speed transient hold signal and transmit the converted digital signal to the control circuit; The high-speed addition and comparison circuit is configured to accumulate the pulse signal of the pulse detection and holding circuit and output an interrupt signal to the control circuit; The control circuit is configured to control the pulse detection and holding circuit to perform high-speed transient holding based on the interrupt signal; Among them, the passband bandwidth of the multi-channel integrated amplifier circuit, the pulse detection and holding circuit, the analog-to-digital conversion circuit, the high-speed addition and comparison circuit and the control circuit are all greater than the laser pulse signal bandwidth, so that the waveform of the laser narrow pulse width signal is not distorted during transmission.

2. The four-quadrant detector signal acquisition and conditioning circuit according to claim 1 is characterized in that , also includes: a four-quadrant detector, the four-quadrant detector includes four transimpedance amplifiers arranged in four quadrant areas, the four transimpedance amplifiers convert the generated charge into voltage signals and input them into the input interfaces of the multi-channel integrated amplifier circuit respectively.

3. The four-quadrant detector signal acquisition and conditioning circuit according to claim 1 is characterized in that , The four input terminals of the pulse detection and holding circuit are respectively connected to the four output terminals of the multi-channel integrated amplifier circuit. The pulse detection and holding circuit has a control pin. In response to the high level of the control pin, the pulse detection and holding circuit output follows the input signal in real time. In response to the low level of the control pin, the pulse detection and holding circuit outputs a high-speed transient holding signal for the input signal.

4. The four-quadrant detector signal acquisition and conditioning circuit according to claim 3 is characterized in that The four input terminals of the high-speed addition and comparison circuit are respectively connected to the four output terminals of the pulse detection and holding circuit, and are configured to accumulate and sum the voltage signals input from the four input terminals, and compare the accumulated voltage with a threshold voltage. When the accumulated voltage is greater than the threshold voltage, an interrupt signal is output.

5. The four-quadrant detector signal acquisition and conditioning circuit according to claim 4 is characterized in that The control circuit is configured to control the control pin to be at a low level in response to an interrupt signal of the high-speed addition and comparison circuit, so that the pulse detection and holding circuit outputs a high-speed transient holding signal for the input signal.

6. The four-quadrant detector signal acquisition and conditioning circuit according to claim 5, characterized in that The four input terminals of the analog-to-digital conversion circuit are respectively connected to the four output terminals of the pulse detection and holding circuit, and the analog-to-digital conversion circuit has a start pin. The analog-to-digital conversion circuit is configured to respond to the high level of the start pin. The analog-to-digital conversion circuit extracts the high-speed transient holding signal of the pulse detection and holding circuit and performs analog-to-digital conversion.

7. The four-quadrant detector signal acquisition and conditioning circuit according to claim 6 is characterized in that The analog-to-digital conversion circuit also has a switch pin, and the analog-to-digital conversion circuit is configured to respond to a switch signal of the switch pin. The control circuit reads an analog-to-digital converted data signal from the analog-to-digital conversion circuit, and the data signal is used to calculate the light spot position.

8. The four-quadrant detector signal acquisition and conditioning circuit according to claim 4 is characterized in that The control circuit is connected to the high-speed addition and comparison circuit through a digital-to-analog conversion chip, and the control circuit provides the threshold voltage to the high-speed addition and comparison circuit through the digital-to-analog conversion chip.

9. The four-quadrant detector signal acquisition and conditioning circuit according to claim 4, characterized in that The high-speed addition and comparison circuit includes a first integrated operational amplifier chip, a second integrated operational amplifier chip, a comparator chip and a level conversion chip connected in sequence.

10. The four-quadrant detector signal acquisition and conditioning circuit according to claim 3, characterized in that The pulse detection and holding circuit includes four parallel-connected follower and holding chips, whose input ends are respectively connected to the four output ends of the multi-channel integrated amplifier circuit.

Images