Wide-range lock-in amplifier

Title: Wide-range lock-in amplifier

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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:

McNeilly, David R ^[1]

Maryville, TN

Issue Date:: 1985-01-01

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/

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                    McNeilly, David R. Wide-range lock-in amplifier.  United States: N. p., 1985. 
        Web.

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                    McNeilly, David R. Wide-range lock-in amplifier.  United States.

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                    McNeilly, David R. Tue .  
        "Wide-range lock-in amplifier".  United States.  https://www.osti.gov/servlets/purl/865599.

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@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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