Specimen testing apparatus

Details Specimen testing apparatus Specimen testing apparatus

1980-12-29

1982-10-19

Goldstein, Herbert

Thermal measuring and testing

Thermal testing of a nonthermal quantity

Expansion or contraction characteristics

374 46, 73805, G01N 2516

Patent

active

043547648

ABSTRACT:
A specimen testing apparatus is disclosed, including a sensing device for engaging a specimen mounted on a support, an electrical measuring system associated with the sensing device for producing an electrical signal that is a function of a variation in a physical characteristic of the specimen as determined by the sensing device, and an electromagnetic compensation system for applying a compensating force to the sensing device. In one operating condition (as, for example, when the thermal expansion properties of the specimen are being tested), the compensation system is operable to apply to the sensing device a force compensating for the weight of the sensing device, thereby to cause the sensing device to rest upon the specimen in a weightless force-free manner. Alternately, the compensation system may be operable to apply to the sensing device a supplemental force in the compressive stressing condition, as might be desired when penetration tests are to be conducted on the specimen.

REFERENCES:
patent: 3470732 (1969-10-01), Welhoelter et al.
patent: 3474658 (1969-10-01), Levy
patent: 3589167 (1971-06-01), Hill
patent: 4235114 (1980-11-01), Mohler

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