Optics: measuring and testing – Material strain analysis – By light interference detector
Patent
1992-11-06
1994-10-25
Turner, Samuel A.
Optics: measuring and testing
Material strain analysis
By light interference detector
356345, 25022727, G01B 902
Patent
active
053594053
ABSTRACT:
A device and method are described for measuring changes association with a gap between a lead-in optical fiber and a lead-out optical fiber. A hybrid fiber optic sensor is created by inserting the lead-in and lead-out optical fibers into a small tube such that a gap is provided between the fibers. Laser pulses incident on the gap create two interfacial reflections that interfere with one another, thus providing a method of measuring changes in gap length in the same was as a typical Fabry-Perot type interferometer. Moreover, a reflection from the far end of the lead-out fiber gives gap information in the same way as typical intensity-based sensor. Together the two measurements overcome the limitations that occur when each technique is used separately, and are made possible by means of the above hybrid fiber optic sensor which contains both a Fabry-Perot interferometer portion and an intensity-based sensor portion.
REFERENCES:
patent: 5202939 (1993-04-01), Belleville et al.
patent: 5301001 (1994-04-01), Murphy et al.
A. Tomita, "Interferometric technique for measuring small gaps in single and multimode fiber connectors".
Bonham David B.
Chin Gay
Martin Marietta Corporation
Rashid Peter J.
Turner Samuel A.
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