Solid state infrared gauge

Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive

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Details

25033912, 2503581, 2503591, G01N 2135, G01N 2186

Patent

active

058215360

ABSTRACT:
A solid state moisture gauge is disclosed in which a quartz-halogen bulb is used with an acousto-optic tunable filter to launch light of specific desired wavelengths into a parallel plate cavity device which contains or is adjacent to material having a moisture content which is to be measured. The light exiting from the parallel plate device is detected, converted to a digital signal and then stored in a computer for later comparison to the detection of light exiting from the parallel plate device of a different wavelength.

REFERENCES:
patent: 3793524 (1974-02-01), Howarth
patent: 4733078 (1988-03-01), Sturm
patent: 5039855 (1991-08-01), Kemeny et al.
patent: 5049216 (1991-09-01), Shead et al.
patent: 5120961 (1992-06-01), Levin et al.
"Acousto-optic Tunable Filters Spectrally Modulate Light", by X. Wang, Laser Focus World, (May 1992).

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