Dual-wavelength four-channel laser radar system for detecting cloud fine structure

The invention discloses a dual-wavelength four-channel laser radar system for detecting a cloud fine structure. The dual-wavelength four-channel laser radar system comprises a laser expanding and transmitting unit, a receiving optical unit, a subsequent beam splitting unit and a signal detection acquisition display and main control unit. The laser expanding and transmitting unit comprises a laser transmitter, a laser transmitter power supply, a first light guide reflecting mirror mounted at the front end of the laser transmitter, a laser beam expander, a light-focusing reflecting mirror and a laser light guide barrel; the receiving optical unit consists of a receiving telescope, a small hole diaphragm, a converging lens and a receiving light guide barrel; the subsequent beam splitting unit comprises a beam splitting mirror set, a second light guide reflecting mirror and a polarization detection prism; the signal detection acquisition display and main control unit consists of a first photomultiplier tube, a second photomultiplier tube, a third photomultiplier tube, an avalanche diode, a four-channel A/D (Analog to Digital) acquisition card, a main control computer and a matched power supply. The dual-wavelength four-channel laser radar system has the characteristics of large SNR (Signal to Noise Ratio), long detection distance and short one-time detection time and realizes full-automatic unmanned continuous detection day and night.