Thermal measuring and testing – Thermal testing of a nonthermal quantity – Expansion or contraction characteristics
Patent
1984-04-23
1985-10-22
Frankfort, Charles
Thermal measuring and testing
Thermal testing of a nonthermal quantity
Expansion or contraction characteristics
336 30, 336136, G01N 2516
Patent
active
045485151
ABSTRACT:
Dilatometers are described which employ measuring heads having multiple linear variable differential transformer dilation sensors for concurrently measuring the thermal dilation of multiple specimens within a single conventional electric tube furnace. The sensors, which have their cores coupled to calibrating micrometers, are positioned in a closely separated cluster in which each sensor is parallel, abreast and adjacent to each other. Separate parallel pushrods, which abut separate specimens within a common tubular specimen holder, are attached to the axially mobile coil of each sensor at the point closest to the center of the cluster. The resulting close separation of the parallel pushrods and their specimens within a small diameter specimen holder permits the use of an energy efficient electric tube furnace having a small diameter oriface and facilitates uniform heating of the pushrods and specimens. The capacity of such dilatometers to handle large numbers of specimens in a short period, as is often required for production control purposes, can be further enhanced by employing two such measuring heads with their pushrods and specimen holders being inserted into opposite ends of the oriface of the tube furnace.
REFERENCES:
patent: 1489115 (1924-04-01), Chevenard
patent: 3680357 (1972-08-01), Clusener
patent: 3885416 (1975-05-01), Cooper
patent: 3919879 (1975-11-01), Betz
patent: 4351615 (1982-09-01), Rodrigues
Frankfort Charles
Levin Burton E.
Will Thomas B.
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