Device to determine the coefficient of the hydric expansion of t

Details Device to determine the coefficient of the hydric expansion of t Device to determine the coefficient of the hydric expansion of t

1990-10-25

1992-08-04

Raevis, Robert

Measuring and testing

Instrument mechanism or transmission

Rate of change

738656, G01N 3336

Patent

active

051348918

ABSTRACT:
So as to determine the coefficient of hydric expansion .beta. of the elements of a composite structure, a sample of this structure is placed in a rigid cradle (10) so that one extremity of the sample is rigidly maintained and that the length variations of the sample are measured by a displacement transducer (12) borne by the cradle. The transducer (12) is preferably a linear differential transformer contact transducer and it is kept under constant humidity by injecting dry air through a flexible tube (60, 64) connected to its rear section. By placing the cradle (10) bearing the sample in a climatic chamber (40), whose humidity is made to vary at a constant temperature, and by at the same time measuring the weight of the sample, it is possible to determine the coefficient .beta..

REFERENCES:
patent: 3817109 (1974-06-01), Audet et al.
patent: 4750374 (1988-06-01), Goss
patent: 4848161 (1989-07-01), van der Kuur
Gardner, Instrumentation for Environmental Chambers, Electro-Technology, Sep. 1963.
F. E. Grace, et al.; "Environmental Dimensional Monitoring"; IBM Technical Disclosure Bulletin; vol. 9, No. 6, Nov. 1966 p. 689.
R. D. Sandison, et al.; "High-Temperature Dilatometer System for Measuring the Shrinkage Kinetics of a Liquid-Containing Ceramic System"; Rev. Sci. Instrum. vol. 50, No. 1 Jan. 1979; pp. 129 and 130.
C. R. Stroope, et al.; "Electronic Dilatomer"; N.T.I.S. Technical Notes; Jul. 1984, No. 7, Part H; p. 507.

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