Apparatus for measuring water content

Details Apparatus for measuring water content Apparatus for measuring water content

1987-05-18

1988-08-16

McGraw, Vincent P.

Optics: measuring and testing

By shade or color

With color transmitting filter

250339, 356419, 356445, G01J 351

Patent

active

047640189

ABSTRACT:
An apparatus for measuring the water content of an object to be measured comprises in combination a pair of optical filters for obtaining from the same source light a reference light having a wavelength not easily absorbed therein and a measuring light having a wavelength easily absorbable therein, an optical system for irradiating the object with the reference and measuring lights, an photoelectric converter for converting the reference and measuring lights to electrical signals, a temperature detector for detecting the temperature of the optical filters, a humidity detector for detecting the humidity of optical paths for the reference and measuring lights, extending from the optical system to the object, and a water content-measuring circuit for finding the quantity of water contained in the object on the basis of output signals produced from the photoelectric converter, temperature detector and humidity detector.

REFERENCES:
patent: 4687335 (1987-08-01), Zupanick et al.

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