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Measurement of the far-field parameters of lasers after atmospheric transmission plays an important role in accurately evaluating the atmospheric transmission characteristics of lasers and the overall performance of laser systems. The spot size formed by the laser after long-distance transmission can reach the meter scale, which cannot be measured by the traditional camera due to the limitation of field of view and resolution. In this paper, a measurement far-field laser system for large-size far-field lasers is designed by the detector array method. The following parts are mainly studied, first, the design of the acquisition circuit of the detector array, second, the development of FPGA for data acquisition and network data transmission, and third, the development of the host computer software to complete the remote control, receiving data, image restoration and parameter measurement work.
The acquisition circuit is based on InGaAs photodetectors, operational amplifiers and analog-to-digital converters to design hardware circuits; Xilinx's Artix-7 series xc7a50t chip as the core to complete the multi-channel parallel acquisition and network data transmission based on the W5300 network chip; the upper computer software is based on the MFC platform for the development of the software, and the proposed image restoration algorithm based on the predicted gradient. The upper computer software is developed based on MFC platform, and the image recovery algorithm based on predicted gradient is proposed. Experimental tests show that the hardware circuit works stably, the communication reliability is high, and the data acquisition and transmission frequency reach 100Hz according to the design requirements.
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