Optical wave guide band edge sensor and method
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United States of America Patent
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Apr 18, 1989
Grant Date -
N/A
app pub date -
Aug 7, 1987
filing date -
Aug 7, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical wave guide sensor which comprises: a broad-band, radiant energy source; an optical wave guide, such as an optical fiber, rectangular slab or thin film, having a guiding interface and an inlet an outlet, the inlet receiving the radiant energy and the wave guide deformable from one part to another of the guide; and a spectral intensity detector at the wave guide outlet to measure the change in the wavelength of the energy critically reflected from the guiding interface on deformation of the wave guide. A method of measuring the deformation of an optical wave guide and/or a parameter causing such deformation, which method comprises: measuring the change in the mode band edge critical wavelength of the first, second or higher mode of the radiant energy throughput of the wave guide as a function of the deformation of the wave guide.
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