Measuring plate thickness

Details Measuring plate thickness Measuring plate thickness

1977-11-29

1982-01-05

Smith, Alfred E.

Radiant energy

Calibration or standardization methods

250358R, G01D 1800, G01N 2300

Patent

active

043096069

ABSTRACT:
The thickness of a hot metal plate is measured during rolling by determining the absorption by the plate of gamma radiation transmitted through the plate, the gamma radiation having at least one characteristic energy. A measurement value of the intensity of the radiation after passage of the plate is provided by digitally counting pulses generated by a radiation detector. Essentially only pulses which belong to the photopeak of said at least one characteristic energy in the pulse spectrum obtained from the detector are counted. The counted number of pulses is corrected for dead time losses by using a live time counter.
Corrected mass absorption coefficients corresponding to partial thickness ranges within the total thickness range are calculated from the measured intensity of radiation passed through calibrating plates of differing thicknesses.

REFERENCES:
patent: 3046402 (1962-07-01), Cherry
patent: 3270205 (1966-08-01), Ladd et al.
patent: 3531643 (1970-09-01), Bretonniere et al.
patent: 3634688 (1972-01-01), Di Rocco
patent: 3757122 (1973-09-01), Bossen et al.
patent: 3814937 (1974-06-01), Lowes
patent: 3953736 (1976-04-01), Kubisiak et al.
patent: 4047029 (1977-09-01), Allport
patent: 4119846 (1978-10-01), Outhwaite et al.
B. V. Rybakow (Editor), Scintillation Method in Radiometry, 1961, AEC-tr-5259, pp. 245-247.

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