Method and apparatus for investigating a sample under tension

Details Method and apparatus for investigating a sample under tension Method and apparatus for investigating a sample under tension

1985-12-23

1988-01-12

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250560, 73826, G01D 534

Patent

active

047193476

ABSTRACT:
A method for investigating a volume change of a sample under tension, with a sample being scanned by a first light beam and the light beam reflected from the sample being detected and further processed. The sample is then illuminated with at least one additional light beam of finite width, with the light beam being converted into a first voltage behind the sample, and a transverse pattern of different reflectivity is scanned by the first light beam longitudinally, and with the change in frequency, produced by stretching, in the reflected light intensity-modulated in this fashion being converted into a corresponding second voltage and the voltages are compared with one another, possibly after calibration.

REFERENCES:
patent: 2670650 (1954-03-01), Wilmotte
patent: 3592545 (1971-07-01), Paine
patent: 4031746 (1977-06-01), Furuta et al.
patent: 4269514 (1981-05-01), Vassberg

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