G - Physics – 01 – N
Patent
G - Physics
01
N
73/57
G01N 21/59 (2006.01) G01N 21/31 (2006.01)
Patent
CA 1080997
Title of the Invention INFRARED MOISTURE MEASURING APPARATUS Abstract of the Disclosure 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 trans- mittance 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 cir- cuit. The output from the detector is also applied a feed- back circuit regulating the temperature of the detector. -1-
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