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CN-121113260-B - Laser detection circuit and laser warning equipment

CN121113260BCN 121113260 BCN121113260 BCN 121113260BCN-121113260-B

Abstract

The application discloses a laser detection circuit and laser warning equipment, and relates to the technical field of lasers. The circuit comprises an acquisition module, an amplifying module, a main detection module, an auxiliary detection module and an AND gate comparator, wherein the acquisition module is used for converting an optical signal into a pulse electric signal, the amplifying module is used for amplifying the pulse electric signal, the main detection module is used for outputting a positive pulse signal and delaying the positive pulse signal to obtain a delayed positive pulse signal when the voltage of the pulse electric signal is greater than or equal to a first reference voltage, the auxiliary detection module is used for outputting a negative pulse signal when the voltage of the pulse electric signal is greater than or equal to a second reference voltage, and the AND gate comparator is used for receiving the delayed positive pulse signal and the negative pulse signal and outputting a target pulse signal when the voltage of the delayed positive pulse signal and the delayed negative pulse signal are simultaneously high. Therefore, the method and the device can automatically remove the interference signals, improve the accuracy of laser warning and solve the problem of false warning caused by the interference signals.

Inventors

  • REN HUAJUN

Assignees

  • 西安雷擎光电科技有限公司

Dates

Publication Date
20260508
Application Date
20251014

Claims (10)

  1. 1. The laser detection circuit is characterized by comprising an acquisition module, an amplifying module, a main detection module, an auxiliary detection module and an AND gate comparator; the amplifying module is respectively connected with the acquisition module, the main detection module and the auxiliary detection module, and is used for receiving the optical signals, converting the optical signals into pulse electric signals and amplifying the pulse electric signals; The main detection module is used for outputting a positive pulse signal and delaying the positive pulse signal to obtain a delayed positive pulse signal when the voltage of the pulse electric signal is greater than or equal to a first reference voltage, and the auxiliary detection module is used for outputting a negative pulse signal when the voltage of the pulse electric signal is greater than or equal to a second reference voltage, wherein the first reference voltage is greater than the second reference voltage; the AND gate comparator is used for receiving the delay positive pulse signal and the negative pulse signal and outputting a target pulse signal when the delay positive pulse signal and the negative pulse signal are at high level at the same time.
  2. 2. The laser detection circuit of claim 1, wherein the main detection module comprises a comparison unit and a delay unit; the comparison unit is connected with the amplifying module and is used for outputting the positive pulse signal under the condition that the voltage of the pulse electric signal is greater than or equal to the first reference voltage; one end of the delay unit is connected with the comparison unit, the other end of the delay unit is connected with the first end of the AND gate comparator, and the delay unit is used for delaying the positive pulse signal and outputting the delayed positive pulse signal.
  3. 3. The laser detection circuit of claim 2, wherein the comparison unit comprises a first comparator, a first resistor, and a second resistor; One end of the first resistor is connected with an external power supply, and the other end of the first resistor is connected with the negative input end of the first comparator to form a first node; One end of the second resistor is grounded, and the other end of the second resistor is connected with the first node; the positive input end of the first comparator is connected with the amplifying module, and the output end of the first comparator is connected with the delay unit.
  4. 4. A laser detection circuit according to claim 3, wherein the delay element comprises at least two inverters in series.
  5. 5. The laser detection circuit of claim 1, wherein the secondary detection module comprises a second comparator, a third resistor, and a fourth resistor; one end of the third resistor is connected with an external power supply, and the other end of the third resistor is connected with the positive input end of the second comparator and forms a second node; one end of the fourth resistor is grounded, and the other end of the fourth resistor is connected with the second node; The negative input end of the second comparator is connected with the amplifying module, and the output end of the second comparator is connected with the second end of the AND gate comparator.
  6. 6. The laser detection circuit according to any one of claims 1 to 5, wherein the amplification module includes a first amplification unit and a second amplification unit; One end of the first amplifying unit is connected with the acquisition module, the other end of the first amplifying unit is connected with one end of the second amplifying unit, and the other end of the second amplifying unit is respectively connected with the main detection module and the auxiliary detection module.
  7. 7. The laser detection circuit of claim 6, wherein the first amplification unit comprises a first amplifier, a fifth resistor, a sixth resistor, a seventh resistor, a first capacitor, and a second capacitor; one end of the first capacitor is connected with the acquisition module, and the other end of the first capacitor is connected with the positive input end of the first amplifier and forms a third node; one end of the seventh resistor is grounded, and the other end of the seventh resistor is connected with the third node; One end of the fifth resistor is grounded, and the other end of the fifth resistor is connected with the negative input end of the first amplifier to form a fourth node; one end of the second capacitor is connected with the output end of the first amplifier to form a fifth node, and the other end of the second capacitor is connected with the second amplifying unit; One end of the sixth resistor is connected with the fourth node, and the other end of the sixth resistor is connected with the fifth node.
  8. 8. The laser detection circuit of claim 7, wherein the second amplification unit comprises a second amplifier, an eighth resistor, a ninth resistor, a tenth resistor, and a third capacitor; One end of the tenth resistor is grounded, and the other end of the tenth resistor is respectively connected with the other end of the second capacitor and the positive input end of the second amplifier; One end of the eighth resistor is grounded, and the other end of the eighth resistor is connected with the negative input end of the second amplifier to form a sixth node; One end of the third capacitor is connected with the output end of the second amplifier to form a seventh node, and the other end of the third capacitor is respectively connected with the main detection module and the auxiliary detection module; One end of the ninth resistor is connected with the sixth node, and the other end of the ninth resistor is connected with the seventh node.
  9. 9. The laser detection circuit of any one of claims 1 to 5, wherein the acquisition module comprises a first diode and an eleventh resistor; The cathode of the first diode is connected with an external power supply, the anode of the first diode is connected with one end of the eleventh resistor, and the other end of the eleventh resistor is grounded; The amplifying module is connected between the first diode and the eleventh resistor.
  10. 10. A laser warning device comprising the laser detection circuit of any one of claims 1 to 9, a signal processing module, and a warning module; The laser detection circuit is connected with the signal processing module and is used for collecting optical signals and converting the optical signals into target pulse signals; The signal processing module is used for processing and identifying the target pulse signal and sending an alarm instruction to the alarm module under the condition that the target pulse signal is determined to be a threat signal; The alarm module is connected with the signal processing module and used for alarming based on the alarm instruction.

Description

Laser detection circuit and laser warning equipment Technical Field The present application relates to the field of laser technologies, and in particular, to a laser detection circuit and a laser alarm device. Background The laser warning device is key equipment in the modern national defense and safety fields, and is characterized in that dangerous laser pulse signals are accurately identified. At present, the equipment generally adopts a photoelectric detector to convert an optical signal into an electric signal, the photoelectric detector performs signal amplification and threshold detection, and when the signal intensity exceeds a set threshold value, a pulse electric signal is output. However, the actual environment is full of a large amount of non-laser pulse light interference signals such as explosion flash, thunder and lightning, various lamplight and the like, and the interference signals are extremely easy to capture by a detection circuit, so that the equipment generates false alarm, and the reliability and the practicability of the equipment are seriously affected. In order to reduce false alarms, the prior art mainly relies on back-end processing software to identify and filter the pulse width of signals. The basis is that the laser pulses are very narrow, typically on the order of nanoseconds, while most flash interference signals are relatively wide, typically on the order of microseconds or milliseconds. Thus, by setting the pulse width threshold, the software can reject the wide pulse jammer. However, the method has a fundamental defect that when the signal intensity of the flash interference signal is weak and the amplified signal amplitude just exceeds the detection threshold value, the corresponding pulse width is also very narrow, so that the pulse width range of the laser possibly falls into the software criterion, and the laser signal is mistaken, so that false alarm is caused. Disclosure of Invention The application mainly aims to provide a laser detection circuit and laser warning equipment, so as to realize automatic rejection of interference signals, improve the accuracy of laser warning and solve the problem of false warning caused by the interference signals. In order to achieve the above purpose, the present application provides a laser detection circuit, which includes an acquisition module, an amplifying module, a main detection module, an auxiliary detection module, and an and gate comparator; the amplifying module is respectively connected with the acquisition module, the main detection module and the auxiliary detection module, and is used for receiving the optical signals, converting the optical signals into pulse electric signals and amplifying the pulse electric signals; The main detection module is used for outputting a positive pulse signal and delaying the positive pulse signal to obtain a delayed positive pulse signal when the voltage of the pulse electric signal is greater than or equal to a first reference voltage, and the auxiliary detection module is used for outputting a negative pulse signal when the voltage of the pulse electric signal is greater than or equal to a second reference voltage, wherein the first reference voltage is greater than the second reference voltage; the AND gate comparator is used for receiving the delay positive pulse signal and the negative pulse signal and outputting a target pulse signal when the delay positive pulse signal and the negative pulse signal are at high level at the same time. Optionally, the main detection module comprises a comparison unit and a delay unit, wherein the comparison unit is connected with the amplification module and is used for outputting the positive pulse signal when the voltage of the pulse electric signal is greater than or equal to the first reference voltage, one end of the delay unit is connected with the comparison unit, the other end of the delay unit is connected with the first end of the AND gate comparator, and the delay unit is used for delaying the positive pulse signal and outputting the delayed positive pulse signal. Optionally, the comparing unit comprises a first comparator, a first resistor and a second resistor, one end of the first resistor is connected with an external power supply, the other end of the first resistor is connected with the negative input end of the first comparator and forms a first node, one end of the second resistor is grounded, the other end of the second resistor is connected with the first node, the positive input end of the first comparator is connected with the amplifying module, and the output end of the first comparator is connected with the delay unit. Optionally, the delay unit comprises at least two inverters connected in series. Optionally, the auxiliary detection module comprises a second comparator, a third resistor and a fourth resistor, one end of the third resistor is connected with an external power supply, the other end of the third resistor is