Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1995-12-22
1997-07-08
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25022719, 356345, G01J 902
Patent
active
056464010
ABSTRACT:
Fiber optic grating and etalon based fiber sensor systems are described that include an all solid state demodulation system with no moving parts. This demodulation system is based on using interference patterns generated by reflections from fiber gratings or etalons and measurements using an optical detector array. This demodulation system is applied to dual overlaid fiber optic gratings that have been written onto noncircularly symmetric birefringent optical fibers. These fiber grating based sensors may be used to measure transverse strain, longitudinal strain and temperature at a single location simultaneously and their nonsymmetric nature allows accurate placement and alignment of the strain sensing axes in materials.
REFERENCES:
patent: 4873989 (1989-10-01), Einzig
patent: 5218419 (1993-06-01), Lipson et al.
patent: 5380995 (1995-01-01), Udd et al.
patent: 5397891 (1995-03-01), Udd et al.
patent: 5399854 (1995-03-01), Dunphy et al.
patent: 5564832 (1996-10-01), Ball et al.
M.G. Xu et al., "Multiplexed Point and Stepwise Continuous Fibre Grating Based Sensors: Practical Sensor for Structure Monitoring?" Proc. SPIE, vol. 2294, pp. 69-80, 1994.
W.W. Morrey, "Distributed Fiber Grating Sensors" Proceeding of 7th OFS Conf., pp. 285-288, Sydney, Australia, Dec. 1990.
R.M. Measures et al, "Structurally Integrated Fiber Optic Strain Rosette", Proc. of SPIE, vol. 986, pp. 32-42, 1988.
E. Udd et al, "Application of the Sagnac Interferometer Based Strain Sensor for Earth Movement Detection System", Proc. of SPIE, vol. 2191, pp. 126-136, 1994.
M.G. Xu et al., "Discrimination between strain and temperature effects using dual wavelength fiber gratings", Elec. Letts, vol. 30, pp. 1085-1087, 1994.
Giles Alan L.
Westin Edward P.
LandOfFree
Fiber optic grating and etalon sensor systems does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fiber optic grating and etalon sensor systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fiber optic grating and etalon sensor systems will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2410079