空间扫描型光纤法布里-珀罗传感解调系统中CCD的光照度数学模型研究

Mathematical Model of Illumination of CCD in the Space Scanning Optical Fiber Fabry-Pérot Sensor Demodulation System

针对空间扫描型光纤法布里-珀罗(F-P)传感解调系统中CCD的光照度分布建立了数学模型,研究了不同帧扫描频率下CCD输出信号和信噪比。利用已设计的解调模块进行了CCD光照度分布的实验,实验结果表明,当帧扫描频率不同时,CCD各个像素输出信号电压的实验值与计算值的相对误差均小于2.5%,同一像素输出信号电压的实验值与计算值的相对误差变化数值均小于0.005,随实验所用CCD帧扫描频率变化,信噪比以184Hz为分界点以两种变化斜率改变,验证了数学分析模型的有效性。

A mathematical model of charge coupled device （CCD） illumination distribution for spatial scanning optical Fabry-P;rot （F-P） demodulation system is established, and a research on the output signal of CCD and its signal-tonoise ratio （SNR） is made. CCD illumination-distribution experiment is done using the designed demodulation module. And results show that the relative error between the experimental and calculated values of the CCD output voltage is less than 2.5 %, and the change of relative error from the same pixel is less than 0. 005 under different frame scan frequencies. The changing rate of SNR is different before and after 184 Hz with the change of frame scan frequency. Experiments are carried out to verify the validity of our established mathematical model.