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Title: 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}
}