Wide-range lock-in amplifier
A lock-in amplifier is provided which allows detection of a signal buried in noise without preprocessing of the input signal. An analog signal multiplier is used to obtain a dc output which is the product of the signal being detected and a high-purity sine wave signal. A reference signal of a known selectable frequency is applied to a sine-wave generator to generate the sine wave of the same frequency. The sine wave is applied to a multiplier through a phase shift arrangement to allow the detection of both amplitude of the detected signal and the phases relative to the reference signal. The multiplier output is filtered by a low-pass filter to eliminate unwanted frequency components from the output signal.
- DOE Contract Number:
- W-7405-ENG-26
- Assignee:
- EDB-84-037442
- Application Number:
- ON: DE84005970
- OSTI ID:
- 5271324
- Country of Publication:
- United States
- Language:
- English
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