Wide-range lock-in amplifier

Details Wide-range lock-in amplifier Wide-range lock-in amplifier

1982-12-07

1985-09-17

Miller, Stanley D.

Oscillators

Relaxation oscillators

328141, 328160, 328133, 328134, 331 2, H03D 306

Patent

active

045423466

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.

REFERENCES:
patent: 4200801 (1980-04-01), Schuresko
patent: 4426622 (1984-01-01), Rittenbach
E. H. Fisher, "Lock-In Amplifiers Obtain Measurements Even If There's More Noise Than Signal" Laser Focus, pp. 82-88, Nov. 1977.
D. Munroe, "The Heterodyning Lock-In Amplifier", Product Bulletin IAN-23, Ithaco, Inc., Mar. 1973.

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