The Application of Lock-in Amplifier in Weak Signal Detection

Jia Tian Zhang; Gang Liu

doi:10.4028/www.scientific.net/AMR.403-408.2650

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 403-408The Application of Lock-in Amplifier in Weak...

The Application of Lock-in Amplifier in Weak Signal Detection

Abstract:

The paper introduces the lock-in amplifier, the basic concept of weak signal detection, and analyzes its application in weak electric signal detection.The results show that: lock-in amplifier has a very strong resistance to noise. Compared to band-pass filter, the output signal is not amplify input signal, but amplify the AC signal and turn it into DC signal.