Wide-range lock-in amplifier
Abstract
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.
- Inventors:
- Issue Date:
- OSTI Identifier:
- 5271324
- Application Number:
- ON: DE84005970
- Assignee:
- EDB-84-037442
- DOE Contract Number:
- W-7405-ENG-26
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING; LOCK-IN AMPLIFIERS; DESIGN; OSCILLATORS; SIGNAL-TO-NOISE RATIO; AMPLIFIERS; ELECTRONIC EQUIPMENT; EQUIPMENT; 420800* - Engineering- Electronic Circuits & Devices- (-1989)
Citation Formats
McNeilly, D.R. Wide-range lock-in amplifier. United States: N. p., 1984.
Web.
McNeilly, D.R. Wide-range lock-in amplifier. United States.
McNeilly, D.R. Sun .
"Wide-range lock-in amplifier". United States.
@article{osti_5271324,
title = {Wide-range lock-in amplifier},
author = {McNeilly, D.R.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1984},
month = {1}
}
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