Micro pulse aerosol lidar

MPAL-Gen2scanninglaser radarWorking wavelength532 nm，The system hardware mainly consists of a laser emitting system, an optical receiving system3D scanning systemOptoelectronic conversion and data acquisition systemanddevicePower supply and communication systemWaiting for composition，The optical and electrical parts of the LiDAR are relatively independent to prevent mutual interferenceThe physical image of the LiDAR is shown belowAs shown.

Scanning micro pulse lidarIt has the characteristics of compact structure, three-dimensional scanning, eye safety, and all-weather detection, and can continuously and accurately detect the three-dimensional spatiotemporal distribution information of atmospheric aerosols, clouds, and boundary layers. This type of LiDAR mainly consists of three parts: optical transceiver module, mechanical scanning control module, and data acquisition module, using diode pumpingNd:YAGSolid state laser as light source, operating wavelength532 nm, can be in7 kHzEnergy emission at repetition rate60 μJPulse laser, laser passes through10Compression divergence angle of magnifying beam mirror***120 μradRetroreflector mirror（M1, M2）Adjust the angle to shoot into the atmosphere. The backscattered light generated by the interaction with various components in the atmosphere is200 mmCaliber Schmidt-Cassegrain telescope receiver, adjustable aperture at focal plane（PH）And the successor1 nmNarrowband interference filter（IF）After reducing background light interference, use a planar convex lens（L1, L2,focal lengthf= 30 mm）Focus on the photosensitive surface of the photon counting photomultiplier tube. After photoelectric conversion, the electrical signal is sent to peripheral devices for interconnection（PCI）Quantization, accumulation, and recording of bus type photon counting cards.

The scanning control unit adopts a dual rotation axis design, and the radar output beam can be in azimuth angle0°***360°, pitch angle 0°***180The continuous variation of the ° interval enables this type of LiDAR to have regular time capability-Height display(Time Height Indicator, THI)Increase distance beyond continuous observation mode-height(Range Height Indicator, RHI), Plane-position(Plane Position Indicator, PPI)Scanning mode enables real-time and flexible acquisition of three-dimensional spatiotemporal distribution information of surrounding atmospheric aerosols and clouds according to demand.

outside1. Technical parameters of scanning laser radar