Feeble light signal conversion method and circuit design used in crop spectrum information inspection

Crop spectrum information inspection instrument is very important in the research of information agriculture and digital farming technique. This paper studies the method and principle of crop spectrum information conversion, estimates and analyzes the measurement error and brings forward the method for decreasing the measurement error. Based on the principle of spectrum information inspection and the characteristic of crop spectrum information, and according to the essential requirement of exactly sampling valid crop spectrum information, a feeble light signal conversion circuit, and related software and hardware system were designed, which effectively resolve the key problem and principal difficulty in crop spectrum information inspection instrument. Field test result indicates that the signal conversion system can accurately sample the feeble signal to fit the complicated field environment and satisfy the requirement of crop spectrum information inspection. The system has very good precision, linearity and stability.