基于近红外双色探测器的信号采集系统设计  

Design of Signal Acquisition System Based on Near Infrared Two-color Detectors

作　　者：吴威[1] 韩顺利[1] 侯喜报[1] 刘磊[1] 项国庆[1] 

机构地区：[1]中国电子科技集团公司第四十一研究所,山东青岛266555

出　　处：《红外》2017年第6期1-7,共7页Infrared

基　　金：国家重点实验室基金项目(9140C120301150C12057)

摘　　要：针对近红外双色探测器在两种不同工作波段的光谱响应曲线及暗电流,设计了一种基于近红外双色探测器的信号采集系统及采集方法。该系统具有多种电流转电压档位、电压放大档位和滤波电路带宽档位,能够快速进行信号放大和带宽控制;同时通过数字/模拟转换器(D/A)为四级放大电路提供模拟调零信号,可有效消除由光学系统的杂散光和探测器自身的暗电流引起的噪声。该系统具有速率快、噪声低和分辨率高等特点。通过使用这种信号采集系统,光学系统的信噪比、动态范围、最小可测功率等指标参数都能得到提高。According to the spectral response curves and dark current of a near infrared two-dolor detector in two different operation wavebands, a signal acquisition system based on the near infrared two- color detector is designed. The system has many current-volt age conversion levels, voltage amplification levels and filter circuit bandwidth levels. It can amplify signals and control bandwidth quickly. Moreover, it provides zero analog signals for four amplify circuits via a Digital-to-Analog （D/A） convertor. This can effectively eliminate the noises caused by the stray light and the dark current of the detector itself.The system has the features of high speed, low noise and high resolution. By using this signal acquisition system, many parameters of the optical system, such as signal-to-noise ratio, dynamic range and minimum measurable power, can be improved.

关 键 词：近红外 双色探测器 信号采集 光谱响应 

分 类 号：TN215[电子电信—物理电子学]