Low false-alarm dual-Gm-APD detector photon counting laser radar

A technology of photon counting and laser radar, which is applied in the direction of instruments, measuring devices, radio wave measuring systems, etc., can solve problems such as being easily triggered by noise, generating false alarms, and affecting normal work

Inactive Publication Date: 2015-12-09
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention is to solve the problem that the existing Gm-APD detectors are easily triggered by noise, thereby gen

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  • Low false-alarm dual-Gm-APD detector photon counting laser radar

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specific Embodiment approach 1

[0014] Specific implementation mode one: refer to figure 1 Specifically illustrate this embodiment, the low false alarm dual Gm-APD detector photon counting lidar described in this embodiment includes a signal processing circuit, a laser 2, a transmitting optical system 3, a receiving optical system 4, a narrow-band filter 5, Spectroscope 6, No. 1 Gm-APD single photon detector 7 and No. 2 Gm-APD single photon detector 8;

[0015] The signal processing circuit comprises a timing module 1 and an 'and' judgment gate 9;

[0016] The output end of the timing module 1 is connected to the input end of the laser 2, the laser 2 emits a laser pulse signal, and the transmitting optical system 3 collimates and emits the received laser pulse signal; the receiving optical system 4 receives the signal, and the signal received by the receiving optical system 4 The signal enters the spectroscope 6 through the narrow-band filter 5, and the spectroscope 6 divides the incident signal into two pa...

specific Embodiment approach 2

[0017] Specific embodiment 2: This embodiment is a further description of the low false alarm dual Gm-APD detector photon counting lidar described in specific embodiment 1. In this embodiment, the timing module 1 is realized by a TDC-GP2 time measurement chip .

[0018] TDC-GP2 time measurement chip is a high-precision time interval measurement chip, which has the characteristics of high precision, small size and low price, and is suitable for low-cost industrial applications. The TDC-GP2 time measurement chip is mainly composed of a pulse generator, a data processing unit, a time-to-digital converter, a temperature measurement unit, a clock control unit, a configuration register and an SPI interface connected to a microcontroller. In practical applications, because the power consumption of the TDC-GP2 time measurement chip is very low, the input / output voltage (working voltage) is 1.8-5.5V, and the core voltage is 1.8-3.6V, so it can be powered by batteries, which is convenie...

specific Embodiment approach 3

[0019] Specific embodiment 3: This embodiment is a further description of the low false alarm dual Gm-APD detector photon counting lidar described in specific embodiment 2. In this embodiment, the timing module 1 also includes a phase-locked circuit and a calibration circuit .

[0020] Since the transmission time of the gate circuit in the TDC-GP2 time measurement chip is greatly affected by temperature and power supply voltage, a phase-lock circuit and a calibration circuit are designed inside the chip to reduce the influence of temperature and power supply voltage on the transmission time of the gate circuit.

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Abstract

The invention discloses a low false-alarm dual-Gm-APD detector photon counting laser radar, and relates to the technical field of laser radars. The invention solves a problem that a conventional Gm-APD detector is liable to be triggered by noises to generate false alarm and affect the normal operation. A light splitter can enable an echo laser signal to be divided into two signals, wherein each signal is detected by one Gm-APD single-photon detector. An AND judgment gate compares the triggering time of the two Gm-APD single-photon detectors in real time. If the two Gm-APD single-photon detectors are triggered at the same moment, the AND judgment gate outputs '1', a timing module stops working, noises do not have temporal correlation, and the two Gm-APD single-photon detectors cannot be triggered at the same time. The AND judgment gate outputs '0', the timing module does not make any operation, thereby inhibiting the noises, and generating no false alarm. The laser radar is suitable for laser radar range finding and laser imaging.

Description

technical field [0001] The invention relates to the technical field of laser radar, in particular to a technology for effectively reducing the false alarm probability of photon counting laser radar. Background technique [0002] Photon counting lidar uses Gm-APD (Geiger mode avalanche photodiode) single-photon detector, which greatly increases the response sensitivity of the system, which is 2-3 orders of magnitude higher than the sensitivity of traditional lidar systems, so it becomes a weak signal Probe for new hope. But it is precisely because of the extremely high response sensitivity of the Gm-APD detector that it is easily triggered by noise while responding to the signal, resulting in false alarms, which greatly affects the normal operation of the Gm-APD. Therefore, the Gm-APD The application of the APD detection system under the background noise of the sun during the day has become a technical difficulty. Contents of the invention [0003] The invention aims to s...

Claims

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Application Information

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IPC IPC(8): G01S17/89G01S17/08
CPCG01S17/89G01S17/08
Inventor 张子静赵远张勇靳辰飞苏建忠吕华
Owner HARBIN INST OF TECH
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