| 基于锁相放大技术的激光超声信号处理电路的设计 |
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| 引用本文： | 金宝印,Dante Dorantes,白茂森,孙凤鸣,李艳宁,陈治,胡小唐.基于锁相放大技术的激光超声信号处理电路的设计[J].传感器与微系统,2012,31(3):109-112. |
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| 作者姓名： | 金宝印 Dante Dorantes 白茂森 孙凤鸣 李艳宁 陈治 胡小唐 |
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| 作者单位： | 天津大学精密测试技术及仪器国家重点实验室,天津,300072 |
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| 摘 要： | 利用激光声表面波(SAW)技术对膜材料机械特性的测量(如杨氏模量、密度、厚度等)已得到了越来越广泛的应用。但激光激发激光检测声表面波(LG/LD-SAW)的频谱带宽较宽(达几百兆到GHz),一般的检测方法难以在如此高的带宽下对其进行检测。设计了一种基于锁相放大(LIA)原理的微弱信号处理电路,通过应用一特殊的去噪电路,能在很宽的频谱(GHz)范围检测微弱信号,并将其从噪声信号中提取出来。
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| 关 键 词： | 激光声表面波 锁相放大 微弱信号 |
Design of signal processing circuit of laser ultrasonic based on phase lock-in amplifier technology |
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| JIN Bao-yin
,
Dante Dorantes
,
BAI Mao-sen
,
SUN Feng-ming
,
LI Yan-ning
,
CHEN Zhi
,
HU Xiao-tang.Design of signal processing circuit of laser ultrasonic based on phase lock-in amplifier technology[J].Transducer and Microsystem Technology,2012,31(3):109-112. |
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| Authors: | JIN Bao-yin Dante Dorantes BAI Mao-sen SUN Feng-ming LI Yan-ning CHEN Zhi HU Xiao-tang |
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| Affiliation: | (State Key Laboratory of Precision Measuring Technology and Instruments,Tianjin University, Tianjin 300072,China) |
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| Abstract: | Laser surface acoustic wave(SAW) technology for measuring thin film mechanical properties such as Young’s modulus,density,thickness,and so on,has been widely used.However,due to wide spectrum bandwidth(up to several hundred MHz to GHz) of laser-generate and laser-detecting surface acoustic wave(LG/LD-SAW),general methods can not detect it in such a high bandwidth.A weak signal processing circuit based on lock-in amplifier(LIA) is proposed,and it achieves GHz detection of weak signals through using a special de-noising circuit and it can be extracted from noise signal. |
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| Keywords: | laser surface acoustic waves(LSAW) lock-in amplifier faint signal |
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