The Lock-In Amplifier: Noise Reduction and Phase Sensitive Detection
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چکیده
To see how our Project Lock-In works, have a look at the Schematic I. You will find there the internal electronic components of the instrument and their interconnections. The most essential parts to make the Lock-In work as such, are a multiplier circuit and a low pass circuit, or integrator, which together form a “PhaseSensitive Detector", or PSD. For reasons you will immediately understand, a phase shifter is needed as well in the overall circuit.
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Stanford Research Systems phone: (408)744-9040 www.thinkSRS.com Lock-in amplifiers are used to detect and measure very small AC signalsall the way down to a few nanovolts. Accurate measurements may be made even when the small signal is obscured by noise sources many thousands of times larger. Lock-in amplifiers use a technique known as phase-sensitive detection to single out the component of t...
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