Optical waveguides – With optical coupler – Input/output coupler
Reexamination Certificate
2005-03-22
2008-09-02
Wong, Tina M (Department: 2874)
Optical waveguides
With optical coupler
Input/output coupler
C385S012000, C385S013000
Reexamination Certificate
active
07421162
ABSTRACT:
In accordance with one exemplary embodiment the invention provides a multi-parameter fiber optic sensing system with an aperiodic sapphire fiber grating as sensing element for simultaneous temperature, strain, NOx, CO, O2and H2gas detection. The exemplary sensing system includes an aperiodic fiber grating with an alternative refractive index modulation for such multi-function sensing and determination. Fabrication of such quasiperiodic grating structures can be made with point-by-point UV laser inscribing, diamond saw micromachining, and phase mask-based coating and chemical etching methods. In the exemplary embodiment, simultaneous detections on multi-parameter can be distributed, but not limited, in gas/steam turbine exhaust, in combustion and compressor, and in coal fired boilers etc. Advantageously, the mapping of multiple parameters such as temperature, strain, and gas using sapphire aperiodic gratings improves control and optimization of such systems directed to improve efficiency and output and reduce emissions.
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Deng Kung-Li Justin
Krok Michael Joseph
McCarthy Kevin Thomas
Taware Avinash Vinayak
Xia Hua
General Electric Company
Wong Tina M
Yoder Fletcher
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