Radiant energy – With infrared or thermal pattern recording – Thermal copying of documents
Patent
1975-10-14
1976-12-21
Dixon, Harold A.
Radiant energy
With infrared or thermal pattern recording
Thermal copying of documents
250359, G03C 900, G01M 2300
Patent
active
039990672
ABSTRACT:
A method of determining the pitch and eccentricity of the winding of a coil unit is provided. It specifically relates to nondestructively examining completely encased heating coils used to simulate the heat generated from fuel rods in reactor studies. The method comprises (1) the use of an x-ray transmission technique through the axial centerline of the coil unit after the winding of the coil unit has been completely encased, (2) the use of a radiation detection instrument to monitor the transmitted radiation, and (3) the use of recording instrumentation calibrated as a function of the distance between windings. A change in the pitch of the winding is detected by a general increase or decrease in the distance between recorded peaks of the transmitted radiation. Eccentricity is detected by a consistent variation in distance between peaks occuring in alternate pairs.
REFERENCES:
patent: 2465676 (1949-03-01), De Ment
patent: 2511853 (1950-06-01), Kaiser
patent: 3684888 (1972-08-01), Knuflemann
Carlson Dean E.
Deckelmann Louis M.
Dixon Harold A.
The United States of America as represented by the United States
Zachry David S.
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