Development Of Lidar Photoelectric Detection Modules And Application Program

The continuous development of the social sciences has promoted the improvement of human material culture,which has led to the deterioration of global environmental problems,and led researchers to begin research on atmospheric science.Lidar uses the signal scattered by the interaction of laser and atmospheric particles as the carrier of atmospheric parameters,and its high resolution and high dynamic range characteristics are widely used in atmospheric exploration.The echo detection system is an important part of lidar for atmospheric detection.Based on the PXI9846 acquisition card,this thesis develops a set of lidar photoelectric detection and application software system suitable for multi-channel atmospheric parameter acquisition for the current engineering application of laser radar system.The main works are as follows:1.According to the current signal detection principle and research status of lidar data acquisition,the signal detection requirements of the data acquisition system are analyzed in detail.Based on this design,the lidar echo detection and application software framework are constructed.2.For the preliminary processing of the lidar echo signal,it is divided into two parts:the signal conditioning module and the data acquisition module.The former converts the weak optical signal into an electrical signal provided to the data acquisition module,wherein the signal of the photoelectric conversion module is about 106～107,and the signal amplification module is about 103～105;the latter provides AD conversion to the computer for processing,which can realize multi-channel simultaneous parallel acquisition and the sampling rate per channel is up to 40MS/s without data loss.3.A set of proprietary application software was developed for the lidar photo-detection system,and the underlying driver of the PXI capture card hardware and the software control interface were designed and implemented.Different from the general lidar data acquisition system,this paper integrates the control of the laser into the control of the upper computer,liberates the laser control panel,and realizes the centralized control idea of the lidar system.The idea of establishing a lidar database was proposed and the formation of the lidar database was initially realized.After the early development and continuous testing and debugging,the prototype is applied to the actual system to achieve real-time and effective continuous observation of low-altitude atmosphere,and the system has been conducting atmospheric detection for several months without system abnormalities.Therefore,this paper has completed the established design tasks and has universal application value.