Lock-in amplifiers used to measure the amplitude of AC signals buried in noise

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Lock-in amplifiers are used to measure the amplitude and phase of repetitive AC signals buried in noise. They achieve this by acting as a narrow bandpass filter which removes unwanted noise while allowing through the signal which is to be measured. The AC frequency of the signal to be measured is used as a reference signal to set the passband region of the filter, and must be supplied to the lock-in amplifier along with the unknown signal.

Article from Boston Electronics Corporation

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