Wide-range lock-in amplifier
- Maryville, TN
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.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- DOE Contract Number:
- W-7405-ENG-26
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 4542346
- OSTI ID:
- 865599
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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
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