Pressure or strain sensitive optical fiber
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United States of America Patent
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-
Sep 13, 1988
Grant Date -
N/A
app pub date -
Oct 28, 1986
filing date -
Oct 28, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Pressure or strain sensitive optical fiber having a core, at least a portion of which has a predetermined refractive index for transmitting light therethrough, a cladding adjacent the core having a refractive index which is less than that of the core, and a concentric light transmissive layer adjacent the cladding having a refractive index which is greater than that of the cladding. The light transmissive layer has an internal diameter which is greater than the unperturbed mode boundary diameter of the core, such that all light passes through the core when the fiber is unperturbed. When the optical fiber is subjected to pressure forces in the form of stress or strain, light passes through the light transmissive layer in proportion to the amount of stress or strain acting upon the fiber. Also, pressor sensors and methods for measuring forces or pertubations utilizing such optical fiber.
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