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, D R

Issue Date:: 1984-01-01

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)

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                    McNeilly, D R. Wide-range lock-in amplifier.  United States: N. p., 1984. 
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                    McNeilly, D R. Wide-range lock-in amplifier.  United States.

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                    McNeilly, D R. Sun .  
        "Wide-range lock-in amplifier".  United States.

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@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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