Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1977-04-19
1978-06-27
Smith, Alfred E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250340, G01J 100
Patent
active
040977439
ABSTRACT:
A moisture analyzer including a first optical system for receiving radiant energy from a source and producing therewith first and second radiant energy beams having a given band of wavelength readily absorbable by moisture and a second optical system for receiving energy from the source and producing therewith third and fourth radiant energy beams having a common band of wavelength less readily absorbable by moisture. An optical director system directs the first and third beams to a sample being analyzed and then to a photodetector and directs the second and fourth beams directly to the photodetector without contacting the sample. In response to the output of the photodetector, an output circuit produces an electrical signal dependent upon a relationship ##EQU1## WHERE V.sub.m is a signal value dependent upon the detected energy level of the first beam, V.sub.m' is a signal value dependent upon the detected energy level of the second beam, V.sub.r is a signal value dependent upon the detected energy level of the third beam and V.sub.r' is a signal value dependent upon the detected energy level of the fourth beam. The term Vr/Vm is a ratio of the different levels of energy absorbed by moisture from the first and third beams of different wavelength and therefore is a measurement of the moisture content in the sample. Conversely, the second and fourth beams that produce the signal V.sub.m' and V.sub.r' are not affected by moisture content of the sample. They are influenced, however, by any temperature induced optical transmission changes in exactly the same manner as are the first and third beams that produce the signals V.sub.r and V.sub.m. Thus, any inaccuracies that would result from such transmission changes are canceled from the moisture indicating output signal ##EQU2##
REFERENCES:
patent: 2772546 (1956-12-01), Barrows
patent: 3790796 (1974-02-01), Brunton et al.
patent: 3820099 (1974-06-01), Vogt
patent: 3828173 (1974-08-01), Knepler
Howell Janice A.
Moisture Systems Corp.
Smith Alfred E.
Toupal John E.
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