Submillimeter laser measurement of water or filler content of sh

Details Submillimeter laser measurement of water or filler content of sh Submillimeter laser measurement of water or filler content of sh

1986-10-29

1988-11-15

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

With means to inspect passive solid objects

2503591, 250339, G01F 2300

Patent

active

047851856

ABSTRACT:
A method and apparatus for detecting the moisture or filler content of dielectric material is disclosed which utilizes a submillimeter laser source of radiation scanned across the face of the material. A plurality of detectors, placed on the side of the material opposite the laser, supplies the material transmittance information to a microcomputer for calculating the moisture or filler content of the material. When thin dielectric materials and/or continuous scanning are utilized the submillimeter laser is pumped by a single CW (continuous wave) CO.sub.2 laser and when thicker dielectrics are measured with discrete pulses the submillimeter laser is pumped by a single TEA (Transversely Excited Atmospheric) CO.sub.2 laser. Depending on the transmission properties of the environment in which the apparatus operates, either the submillimeter laser beam or the infrared pump laser beam can be transmitted through the medium surrounding the apparatus in order to minimize pre-measurement attenuation of the beam.

REFERENCES:
patent: 3597616 (1971-08-01), Brunton et al.
patent: 4450356 (1984-05-01), Murray et al.

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