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Coaxial aerosol laser radar system of human-eye safe wavelength

A technology of human eye safety and laser radar, which is applied in the direction of radio wave measurement system, electromagnetic wave re-radiation, instruments, etc., can solve the problems of unsafe crowds, harmful human eyes, short detection distance, etc., and improve the accuracy of spatial resolution , reduce the light trigger delay, minimize the effect of blind area

Active Publication Date: 2014-12-03
SHANDONG UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] 1. The detection distance is relatively short, and the pulse energy is at the uJ level, which is far inferior to the lidar developed in the early stage. The lidar with high energy is not safe for the crowd;
[0005] 2. In terms of laser wavelength, the iris of the human eye easily absorbs 1064nm laser, no matter how small the energy is, it is also harmful to human eye safety;
[0006] 3. For places where the aerosol concentration distribution is relatively dense, the penetration ability of 532nm is relatively weak, and the measurement distance is relatively short, while the laser energy of 1064nm is not safe for human eyes
[0007] 4. The longest wavelength band of the current laser radar is 1064nm, and the laser radar in the 1.5um band that is safe for human eyes to detect large particles has not yet been found

Method used

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  • Coaxial aerosol laser radar system of human-eye safe wavelength

Examples

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Effect test

Embodiment 1

[0049] Such as figure 1 shown.

[0050] A coaxial aerosol lidar system with eye-safe wavelengths, including a laser unit, a reflected laser acquisition unit, and a data acquisition unit;

[0051]The laser part includes a laser and a beam expander 2, and the laser light emitted by the laser 1 is translated by the beam expander 2 and a pair of mirrors 3 arranged in parallel, so that the outgoing direction of the translated laser is consistent with the reflection The laser collection unit is set coaxially; the parameters of the laser are 1) wavelength range: 1.4-1.8 μm; 2) single pulse energy: >10uJ; 3) pulse repetition frequency: 1-50kHz; the laser is an OPO laser, The reflected laser collection unit includes a telescope 5, a narrow-band interference filter 6 and a lens arranged in sequence along the reflected laser reflection direction; the lens is an aspheric lens 7;

[0052] Described data collection unit comprises InGaAs APD single-photon counting system 9, and described a...

Embodiment 2

[0069] A kind of coaxial aerosol lidar system of human eye safety wavelength as described in embodiment 1, its difference is that,

[0070] The data acquisition unit also includes a data acquisition card 10 and a computer 11; the data acquisition card 10 collects the laser data collected in the InGaAs APD single photon counting system 9 and transmits it to the computer 11;

[0071] The trigger signal of the InGaAs APD single photon counting system 9 and the data acquisition unit is directly derived from the trigger signal of the OPO laser;

[0072] The data acquisition card adopts MSP-800 series single-photon counting card, and the parameters of the counting card are as follows, channel mode: dual channel; measurement speed: 800MHz; gate pulse width: 1ns; slot type: PC slot.

Embodiment 3

[0074] A coaxial aerosol lidar system with a human eye-safe wavelength as described in Examples 1 and 2, the difference is that the InGaAs APD single-photon counting system uses a 1.25GHz sinusoidal gating to realize the InGaAs APD detector In Geiger mode.

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Abstract

The invention relates to a coaxial aerosol laser radar system of a human-eye safe wavelength. An OPO laser device is adopted and then parallel light beams are formed via beam expansion and collimation of a beam expander and then the parallel light beams are emitted into the atmosphere via reflectors. Backward scattered signals of the atmosphere are received by a telescope, and after stray light is restrained through a narrow-band interference filter, a lens is coupled to an optical fiber which then focuses optical signals in an InGaAs APD single-photon counting system and then data acquisition processing is carried out by a data acquisition card and data is stored and realized in a computer. At last, the computer carries out data signal processing and thus atmospherical aerosol parameters are obtained.

Description

technical field [0001] The invention relates to a coaxial aerosol laser radar system with a wavelength safe for human eyes, and belongs to the technical field of pulse laser radar. Background technique [0002] At present, the lidar system used to detect aerosols consists of a laser emitting unit (pulse laser, laser beam expansion and collimation), a laser receiving unit (telescope, interference filter), a signal detection unit, and a data acquisition and processing unit. The laser emitting unit sends a pulse signal into the atmosphere, receives the scattered signal through the telescope, detects it through the detection unit, and processes it through the data acquisition and processing unit to realize the atmospheric aerosol extinction ratio and other parameters. [0003] At present, general laser radars use laser wavelengths of 532nm or 1064nm to measure aerosols. Generally, laser radars have relatively large energy (0.1-1J) and long detection distances, but they cause cer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/88
CPCG01S7/4812G01S7/483G01S17/88G01S17/95
Inventor 刘兆军张飒飒夏金宝李永富丛振华刘杨门少杰冯超
Owner SHANDONG UNIV
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