| 微弱信号锁相检测的电路研究 |
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| 引用本文： | 杨行,杨嵩,刘艺.微弱信号锁相检测的电路研究[J].压电与声光,2015,37(3):529-532. |
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| 作者姓名： | 杨行 杨嵩 刘艺 |
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| 作者单位： | （1.电子科技大学 物理电子学院，四川 成都 610054；,2.中国电子科技集团公司第二十六研究所，重庆 400060） |
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| 摘 要： | 在利用红外光谱技术进行工业检测的系统中,有用信息通常是淹没在强噪声背景中的微弱信号,因此可采用微弱信号检测技术中的锁相放大器来实现有用信号的提取。该文阐述了微弱信号检测的基本原理,比较了不同参考波形的优劣。设计运用AD630作为相关乘法器的锁相放大器,实现了在强噪声环境中有效地提取信号。测试结果表明,该电路结构简单,线性度高,信噪比得到改善可达62dB。
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| 关 键 词： | 锁相放大器 AD630 微弱信号 光谱检测 |
Research on Weak Signal Detecting Circuit with Lock in Amplifier |
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| YANG Hang,YANG Song and LIU Yi.Research on Weak Signal Detecting Circuit with Lock in Amplifier[J].Piezoelectrics & Acoustooptics,2015,37(3):529-532. |
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| Authors: | YANG Hang YANG Song and LIU Yi |
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| Affiliation: | (1.School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China;,2. 26th Institute of China Electronics Technology Group Corporation, Chongqing 400060, China ) |
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| Abstract: | In near infrared spectroscopy for detection of industry systems, the useful information weak signal is often submerged in strong background noise. The lock in amplifier could be used by weak signal detection technology to achieve the extraction of useful signa1. Weak signal detection theory was described, and the outputs of the different reference signals were compared. A lock in amplifier was designed using the AD630 as associated multiplier to extract the useful information in strong background noise. The test results indicated that the circuit structure was simple with high linearity of outputs, and the SNRI value was 62 dB. |
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| Keywords: | lock in amplifier AD630 weak signal spectrum detection |
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