Design of Precipitation Particle Measuring System Based on Linear CCD

The raindrop spectrum detection technology based on optical principle is of great significance for the observation of precipitation phenomenon and the calibration of radar. In view of this background, the paper proposes a method of precipitation particle measuring system based on linear CCD. The system drives the CCD by the FPGA at high speed, which makes CCD can perfectly match the parallel light source to form the particle detection space, from which it can collect particle pixel information. Then the data processing part with FPGA as the core compares and compresses the collected data to obtain the accurate grayscale image information of the particles. Finally, the system transmits grayscale images to the PC in real time and at high speed by using Gigabit Ethernet. For the purpose of verifying the feasibility and accuracy of the system, two experiments were carried out respectively using steel balls of different diameters and dripping water to simulate the raindrop particles. By comparing and analyzing the experimental data, the results show that the system can basically restore the grayscale images of two simulated particles with good accuracy and consistency. The conclusion can be drawn that the measuring system can basically meet the measuring requirements of optical raindrop spectrum measuring instrument of high-speed, accurate and non-contact.