Microphonics elimination circuit

Details Microphonics elimination circuit Microphonics elimination circuit

1978-10-11

1980-09-23

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250338, G01J 100

Patent

active

042245214

ABSTRACT:
The effects of microphonic noise on the output of an array of commonly-mounted pyroelectric detectors are suppressed by contemporaneously adding the signal outputs from all of the detectors, determining the averaged signal, and separately subtracting the averaged signal from each detector output. The method cancels microphonic noise and reduces random noise with only a slight decrease in the signal-to-noise ratio.

REFERENCES:
patent: 3398285 (1968-08-01), Sachs
patent: 3453432 (1969-07-01), McHenry
patent: 3531802 (1970-09-01), Brown et al.
patent: 3732420 (1973-05-01), Brunnett
patent: 3787668 (1974-01-01), Currie et al.
patent: 3806729 (1974-04-01), Caywood
patent: 3916325 (1975-10-01), Lund
patent: 4039883 (1977-08-01), Thom
patent: 4060729 (1977-11-01), Byer et al.

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