lock-in amplifier

(redirected from Phase sensitive detector)
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lock-in amplifier

[′läk‚in ′am·plə‚fī·ər]
(electronics)
An amplifier that uses some form of automatic synchronization with an external reference signal to detect and measure very weak electromagnetic radiation at radio or optical wavelengths in the presence of very high noise levels.
References in periodicals archive ?
The dependency of output voltage on ferrous metal size was investigated, using ferrous test balls having diameter of 0.8 mm, 1.0 mm, and 1.2 mm at 50 kHz exciting frequency and 33 Hz LPF (low-pass filter) cutoff frequency after PSD (phase sensitive detector).