Optics: measuring and testing – By shade or color – With sequential comparison of sample and standard
Patent
1976-12-27
1979-10-23
McGraw, Vincent P.
Optics: measuring and testing
By shade or color
With sequential comparison of sample and standard
356425, 356419, 250238, 250339, G01J 346, G01J 348
Patent
active
041719182
ABSTRACT:
Apparatus for determining the content of moisture or other substance in a material by measuring its relative reflectance at two infrared wavelengths. A chopped radiation beam is produced by arranging a tuning fork such that an oscillating element alternatively moves first and second spaced optical bandpass filters having first and second passband wavelengths into position to intercept a beam of source radiation. The chopped beam is directed on the material being analyzed, and radiation reflected therefrom is applied to a radiation detector. The relative transmittances of the filters at their passband wavelengths are such that the radiation detector generates alternating pulses of equal amplitude for a material having a specified content of the substance. The tuning fork also includes a third filter of zero transmittance which periodically interrupts the beam of source radiation so that the detector provides a background signal which is used to correct the amplitudes of the alternating pulses. The alternating pulses are separated and applied to a ratio-determining circuit. The output from the detector is also applied a feedback circuit regulating the temperature of the detector.
REFERENCES:
patent: 3467475 (1969-09-01), Celio et al.
patent: 3661462 (1972-05-01), Natens
patent: 3793522 (1974-02-01), Coleby et al.
patent: 3853407 (1974-10-01), Dewey
patent: 3878107 (1975-04-01), Pembrook et al.
patent: 3936637 (1976-02-01), Reine et al.
patent: 4006358 (1977-02-01), Howarth
Bovernick Rodney B.
McGraw Vincent P.
Sentrol Systems Ltd.
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