星上定标系统探测器高精度信号处理电路的实现  

Realization of high precision signal processing circuit for spaceborne calibration detector

作　　者：李东景[1,2] 于平[1] 李先锋[1] 赵昶宇[1,2] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033 [2]中国科学院研究生院,北京100039

出　　处：《中国光学与应用光学》2009年第3期211-217,共7页Chinese Optics and Applied Optics Abstracts

摘　　要：针对星上定标系统对探测器信号处理的技术要求,采用高精度模数转换器件—VFC型A/D转换器AD650设计了一种从光电流转换为频率输出的高性能转换电路。以硅陷阱探测器为基础研制了标准探测器,介绍了标准探测器的组成及光学原理,说明了VFC型A/D转换电路的设计思想和实现方法。该电路利用积分原理,将输入电压(或电流)转换成频率输出,脉冲频率与输入电压(或电流)成比例,其精度高、线性度好,转换位数与速度可调,与CPU连线很少。对光谱辐亮度的探测实验表明,以此原理设计的电路其输出频率非线性误差为0.23%,非稳定性误差为0.020%/h,结果满足系统设计要求。By using a high-precision analog-to-digital conversion circuit, VFC-type A/D converter-AD650, a kind of high-performance conversion circuit was designed to convert a photocurrent signal to a frequency signal for the detector calibration in a spaceborne camera. The components and optic principles of the standard detectot based on a Si trap detector were described and the design of the VFC-A/D conversion circuit were introduced in detail. Based on the integral principle, the input voltage （or current） was inverted into the frequency output in proportion to the input voltage（ or current）, which was characterized not only by its high accuracy and good linearity but also by its fewer connection lines and adjustable conversion digits and velocities. The experiment results for the spectral radiance detection show that the nonlinear error and the stability error of the output frequency are less than 0. 23% and 0. 020%/h, respectively. These results meet the design requirements.

关 键 词：标准探测器 U/F转换 AD650 信号处理 

分 类 号：V423.6[航空宇航科学与技术—飞行器设计]