Radiant energy – Invisible radiant energy responsive electric signalling – With means to inspect passive solid objects
Patent
1987-07-28
1988-07-05
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
With means to inspect passive solid objects
250339, 2503591, G01N 2139
Patent
active
047556781
ABSTRACT:
A system for detecting simultaneously the moisture content and basis weight of paper is disclosed utilizing a submillimeter laser source of radiation of two different wavelengths which is subsequently scanned across the face of the paper. A plurality of detectors placed on the side of the paper opposite the laser supplies the transmittance information for each of the wavelengths to a microcomputer which in turn calculates the moisture content and the basis weight of the material. The two different wavelengths of submillimeter radiation are produced by either a pair of submillimeter lasers pumped by a continuous wave CO.sub.2 laser or by a single submillimeter laser pumped by a waveguide type continuous wave CO.sub.2 laser whose output is controlled by a piezoelectric crystal tuned resonator in order to provide the required two separate wavelengths alternating in time which are output in the single beam of the submillimeter laser.
REFERENCES:
patent: 3551678 (1970-12-01), Mitchell
patent: 3806730 (1974-04-01), Tirkkonen et al.
patent: 4427889 (1984-01-01), Muller
Boulay et al, "Paper Sheet Moisture Measurements in the Far Infrared", Eighth International Conf. on Infrared and Millimeter Waves", Dec. 1983.
Boulay Russell
Drouin Bernard
Gagnon Richard
Izatt Jerald R.
Fields Carolyn E.
The University of Alabama
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