Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1978-03-08
1981-04-28
Ruehl, Charles A.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
250225, 350407, G01B 1116
Patent
active
042638100
ABSTRACT:
A method and apparatus of measurement of angular deformation of a body, and in particular, a method and apparatus of load or force sensing are disclosed. Chief applications are found in electronic weighing and related devices. Deformation of a body in the form of angular deflection, or a deformation that can be transformed into angular deflection by mechanical or other means, changes the angle between the polarization axes of a pair of light polarizers, thus changing the intensity of light that is transmitted through the pair of polarizers. A photodetector converts the transmitted light into an electric signal. This signal contains information regarding the amount of deformation of the body and may be used in its analog form to operate a voltmeter to give a visual readout, or converted into a digital form for activating a visual digital display, or for inputing into a digital data processing device. A specially designed feedback-stabilized light source produces an output whose D.C. level stays constant regardless of variations in certain of the properties of the photodetectors and the light source.
REFERENCES:
patent: 3308303 (1967-03-01), Weichselbaum et al.
patent: 3596100 (1971-07-01), Hollick
patent: 3775617 (1973-11-01), Dubauskas
L. T. Lemke-IBM Technical Disclosure Bulletin-vol. 12, No. 5, Oct. 1969, p. 692.
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