Physical quantity measurement apparatus and instrument therefor

Optics: measuring and testing – By polarized light examination

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356345, 356349, 356351, 73862624, H04N 584, G03B 1500

Patent

active

056754159

ABSTRACT:
A physical quantity measuring apparatus in which the measurement range of the physical quantity such as displacement, pressure or the like can be widened. Laser beams different in wavelength are radiated through an optical fiber onto a diaphragm and the light reflected on the diaphragm and the light reflected on a reference face opposite to the diaphragm are returned to the optical fiber so that the distance between the reference face and the diaphragm which is transformed, and hence a pressure difference, is measured by a light interference method. The quantity of displacement of the diaphragm is measured optically by using laser beams different in wavelength from each other so that it is possible to make the measurement accuracy high and to effect measurement in a wide range with respect to a physical quantity such as displacement, pressure, or the like, without being influenced by a change in characteristic of the optical fiber.

REFERENCES:
patent: 4902888 (1990-02-01), Kondo
patent: 4958929 (1990-09-01), Kondo
patent: 5101664 (1992-04-01), Hockaday et al.
patent: 5288995 (1994-02-01), Strachan

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