Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1989-02-21
1990-09-11
Noland, Tom
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
73655, 73778, 73847, 25022714, 34087029, G01L 124
Patent
active
049552384
ABSTRACT:
An optical sensor uses a torsion-mounted thin silicon paddle (1) with magnetically soft material on its back. A light beam falls on the front face and part of the beam is reflected to a photo-diode (4) whose output drives a current in a magnetizing coil (5). The magnetic field thus produced rotates the paddle out of the beam, which cuts off the light to the photo-diode. Thus the paddle oscillates with an amplitude which depends on the strain due to the torsion mounting. This modulates the light beam, and if they have different resonances several such sensors can share the same beam with a common read-out.
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Hale Peter G.
Jones Roger E.
Willson Jolyon P.
Noland Tom
STC PLC
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