宇航计测技术

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交流阻抗测量系统中交流小电流测量方法

焦海妮1;王斌1   

  1. 1、北京东方计量测试研究所,北京 100086
  • 出版日期:2013-12-15 发布日期:2013-12-15
  • 作者简介:海妮(1988-),女,硕士研究生,主要研究方向:航天器电源系统稳定性研究和电源系统负载输入阻抗测量。

Weak AC Current Measurement of AC Impedance Measurement System

JIAO Hai-ni1;WANG Bin1   

  1. 1、Beijing Orient Institute for Measurement & Test,Beijing 100086
  • Online:2013-12-15 Published:2013-12-15

摘要: 交流小电流测量是交流阻抗测量的关键技术之一。分析了交流小电流测量对交流阻抗测量的影响,提出采用数字相敏检波原理测量交流小电流的方法,利用互相关技术有效克服放大器噪声对交流小电流测量的影响,完成了交流阻抗测量的预期功能,达到了预期的效果。

关键词: 交流测量, 小电流, 阻抗, 相敏检波, 微弱信号检测

Abstract: AC weak current measurement is one of the key technologies in AC impedance measurement. Effect of the AC weak current measurement to AC impedance measurement is analyzed, the method of using Phase Sensitive Detector (PSD) to measure the AC weak current  is put forwarded, using cross-correlation technique the amplifier noise influence to AC current measurement  is conquered, the expected function of AC impedance measurement system is done and  the desired accuracy is achieved.

Key words: AC measurement, Micro current, Impedance, Phase sensitive detector, Weak-signal detective