Optical sensor

Details Optical sensor Optical sensor

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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