摘要
在多元红外探测器的测试过程中,传统方法往往通过分析仪采集并配合人工读数的方式来实现数据获取。分析仪与前置放大器、气源及工装夹具各自独立工作,采集的数据需要再次编辑且效率低下。为了实现精确的自动化工程测试,并同时实现气源与工装夹具等控制一体化,将丹麦B&K公司的PULSE多分析仪作为采集端,并利用VBA程序对采集控制软件进行了二次开发,从而实现了自动测试。分析了系统建立过程中的放大器噪声源,拟合了噪声系数与源阻抗之间的关系,并阐明了实现低噪声放大这一目标的关键是探测器和前置放大器的最佳源阻抗匹配。另外还将放大器的第一级设计成多通道并行,并在后级放大与第一级之间使用切换开关来保持通道的一致性。通过软硬件的结合最终实现了对探测器进行实时、多通道快速傅里叶变换(Fast Fourier Transform,FFT)分析的自动化测试。
In the test process of multi-element infrared detector,the traditional method usually uses the way of analyzer collection and manual reading to achieve the data acquisition.The analyzer,preamplifier,gas source and fixture work independently,and the collected data need to be edited again with low efficiency.In order to achieve accurate automated engineering test and the control integration of the gas source and fixture at the same time,the PULSE multi-analyzer of Denmark B&K company is used as the acquisition terminal,and the acquisition and control software is re-developed by using VBA program.In this way mentioned above,the automated test is achieved.In this paper,the noise source of amplifier in the process of system establishment is analyzed,and the relationship between noise coefficient and source impedance is fitted.It is illustrated that the key to achieve low noise amplification is the optimal source impedance match between the detector and the preamplifier.In addition,the first stage of the amplifier is designed to be multi-channel parallel,and the switch is used between the second stage and the first stage to maintain the consistency of the channels.Finally,through the combination of the software and the hardware,the automated test of real-time and multi-channel fast Fourier transform analysis of the detector is realized.
作者
刘建伟
邢艳蕾
姚广乐
LIU Jian-wei;XING Yan-lei;YAO Guang-le(The Eleventh Research Institute of China Electronics Technology Group Corporation,Beijing 100015,China)
出处
《红外》
CAS
2020年第7期5-10,共6页
Infrared
