Fiber with multiple overlapping gratings
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United States of America Patent
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-
May 6, 1997
Issued Date -
N/A
app pub date -
Jan 10, 1995
filing date -
Oct 20, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Two or more overlapping fiber gratings are formed in a section of optical fiber to sense environmental effects that can vary the spacing between the lines of the grating to vary the center frequency of the spectral envelope, either reflected or passed thereby. The fiber gratings if properly oriented can respond to strain applied thereto in x, y, and z directions and temperature so that a three axis sensor can be formed at a short length of optical fiber and be calibrated for temperature. The multiple optical gratings are formed by sensitizing an optical fiber to light and then using two or more light interference patterns to form the gratings.
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