A coaxial aerosol lidar system with eye-safe wavelengths
An eye-safe, lidar technology, used in radio wave measurement systems, re-radiation of electromagnetic waves, instruments, etc., can solve problems such as unsafe crowds, harmful eye safety, and short detection distances, and improve spatial resolution accuracy. , The effect of reducing the light trigger delay and minimizing the blind area
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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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