摘要
为解决传统信号检测装置精度低、信噪比低的问题,研制了一种基于锁相放大原理的微弱信号检测装置。本装置是以超低功耗单片机MSP430为处理器,结合锁相放大原理实现的微弱信号监测装置,该装置包含加法器、纯电阻衰减网络、微弱信号检测电路及单片机控制显示和AD采样。本装置能将微弱信号从强噪声中检测出来,并通过液晶显示实时采样的幅值,且误差最高能达到1%以下,所能检测到的弱信号幅度能达到20mV以下,误差基本能达到要求指标。
In order to solve the problems of low precision and low signal-to-noise ratio of traditional signal detection devices,a weak signal detection device based on phase-locked amplification principle is developed.This device is a weak signal monitoring device based on the ultra-low power single chip MSP430 and the principle of lock-in amplif ication.The device includes adder,pure resistance attenuation network,weak signal detection circuit,MCU control display and AD sampling.The device can detect weak signal from strong noise,and real-time sample amplitude through LCD display.The maximum error can be less than 1%.The detected weak signal amplitude can be less than 20 mV,and the error can basically meet the requirements.
出处
《中国仪器仪表》
2019年第9期62-66,共5页
China Instrumentation
基金
陕西教育厅专项科研计划(18jk0966)
关键词
微弱信号
强噪声
MSP430
提取
锁相放大
Weak signal
Strong noise
MSP430
Extraction
Phase-locked amplification
