Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2008-06-17
2008-06-17
Luu, Thanh X (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C073S784000
Reexamination Certificate
active
07388190
ABSTRACT:
The invention provides a monitoring device mainly for sensing ground displacement, including the fiber Bragg grating sensored deflectometer and the signal interrogator/computer system. The device uses a segmented design that consists of a flexible tube (referred to as the flexible segment) and two rigid segments and thus referred to as the double hinged FBG segmented deflectometer (DH-FBG-SD). For field installation, multiple DH-FBG-SD units are connected together to form a string as it is inserted into a grouted-in-place inclinometer casing. The distortion of the inclinometer casing induced by ground movement causes relative rotation of the inserted DH-FBG-SD. All of the DH-FBG-SD units are connected to an FBG interrogator/computer system situated on ground surface. The FBG signals are recorded and analyzed by the interrogator/computer system.
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Shiang et al., “Optical Fiber Sensing Technology, and Introduction of Implanted optical Fiber Bend Meter and Test Application”, Proceedings of 1 2t Non-destructive Detection Technology Symposium (2004), pp. 273-279.
Yoshida, Y., Kashiwai, Y, Murakami, E., Ishida, S., and Hashiguchi, N.,2002, “Development of the monitoring system for slope deformations”, Proceedings, SPIE vol. 4694, pp. 296-302.
Ho Yen-Te
Huang An-Bin
Bucknam and Archer
Luu Thanh X
National Chiao Tung University
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