| 锁定放大技术在ACFM检测电路设计中的应用 |
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| 引用本文： | 杨耀,任尚坤,李忠基.锁定放大技术在ACFM检测电路设计中的应用[J].仪表技术与传感器,2011(2). |
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| 作者姓名： | 杨耀 任尚坤 李忠基 |
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| 作者单位： | 南昌航空大学无损检测技术教育部重点试验室,江西南昌,330063 |
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| 基金项目： | 江西省教育基金，教育部无损检测重点实验室基金，国家自然科学基金资助项目 |
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| 摘 要： | 扰动磁场检测信号是微弱信号且总是不可避免地含有噪声和干扰信号.利用锁定放大技术设计一扰动磁场检测电路,包括去2.5 V直流电路、放大滤波电路、移相电路、电压型开关式乘法器.该设计电路实现了对扰动磁场微弱信号的测量与消噪处理.试验表明,利用锁定放大技术设计优化ACFM检测电路是一种有效的方法.
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| 关 键 词： | 锁定放大技术 交流电磁场 微弱信号检测 |
Application of Lock-in Amplifier in Alternating Current Field Measurement |
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| YANG Yao,REN Shang-kun,LI Zhong-ji.Application of Lock-in Amplifier in Alternating Current Field Measurement[J].Instrument Technique and Sensor,2011(2). |
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| Authors: | YANG Yao REN Shang-kun LI Zhong-ji |
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| Affiliation: | YANG Yao,REN Shang-kun,LI Zhong-ji(Key Lab of Nondestructive Testing(Ministry of Education),Nanchang Hangkong University,Nanchang 330063,China) |
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| Abstract: | In ACFM,the detection signal is the weak signal and always inevitably includes the noise and the unwanted signal.This paper used the lock-in amplifier technology,designed a magnetic disturbance detection circuit including eliminate 2.5 V DC circuit,amplifying and filtering circuit,phase-shifting circuit and the switching voltage multiplier.This design circuit enables performed the measurement and do-nosing for weak magnetic signal of ACFM.The experiment indicated that the use of lock-in amplifier technology... |
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| Keywords: | lock-in amplifier technique alternating current field measurement weak signal detection |
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