Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Specified electrical sensor or system
Patent
1982-07-22
1983-12-06
Ruehl, Charles A.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Specified electrical sensor or system
73DIG4, 128774, 280DIG13, G01B 716
Patent
active
044185774
ABSTRACT:
This process involves detecting piezo-electric potentials which are characteristic of a mechanical strain exerted on a long rigid member made of organic material. For this purpose, the potentials at two points spaced apart on this member are measured by means of two operational amplifiers CI.sub.1 and CI.sub.2 in order to obtain a signal which is characteristic of the stress rather than of its derivative and these signals are processed by means of analog operators OA.sub.1, OA.sub.2, OA.sub.3 in order to identify the bending .DELTA. F and torsional T stresses which are then compared with reference values RT, RF in order, for example, to trigger a signal. This process can be used for opening a safety ski binding.
REFERENCES:
patent: 3640130 (1972-02-01), Spescha et al.
patent: 4033183 (1977-07-01), List et al.
patent: 4235243 (1980-11-01), Saha
Bazhenov-"Piezoelectric Properties of Wood", Consultants Bureau, N.Y., 1961, pp. 23-24.
Lakes et al.-"Device for Determining Bone Properties", Medical Instrumentation-vol. 12, No. 2, 1978, pp. 106-109.
Saha et al.-"Non-Invasive Techniques Using the Piezoelectric Effect", IEEE Transactions-vol. BMF-24, No. 6, Nov. 1977, pp. 508-512.
Arieh Simon
Courvoisier Guy
Prost Jean-Louis
Battelle (Memorial Institute)
Dubno Herbert
Ross Karl F.
Ruehl Charles A.
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