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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:
 [1]
  1. Maryville, TN
Issue Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
OSTI Identifier:
865599
Patent Number(s):
4542346
Assignee:
United States of America as represented by United States (Washington, DC)
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
wide-range; lock-in; amplifier; provided; allows; detection; signal; buried; noise; preprocessing; input; analog; multiplier; obtain; dc; output; product; detected; high-purity; sine; wave; reference; selectable; frequency; applied; sine-wave; generator; generate; phase; shift; arrangement; allow; amplitude; phases; relative; filtered; low-pass; filter; eliminate; unwanted; components; dc output; frequency components; phase shift; reference signal; output signal; input signal; analog signal; wave generator; sine wave; detected signal; pass filter; wave signal; frequency component; low-pass filter; lock-in amplifier; multiplier output; selectable frequency; allows detection; /327/331/

Citation Formats

McNeilly, David R. Wide-range lock-in amplifier. United States: N. p., 1985. Web.
McNeilly, David R. Wide-range lock-in amplifier. United States.
McNeilly, David R. Tue . "Wide-range lock-in amplifier". United States. https://www.osti.gov/servlets/purl/865599.
@article{osti_865599,
title = {Wide-range lock-in amplifier},
author = {McNeilly, David 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 = {1985},
month = {1}
}

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