Patent 5355423 Issued on October 11, 1994. Estimated Expiration Date: July 16, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
385/12, OPTICAL WAVEGUIDE SENSOR374/131, With radiation conducting element385/31, Input/output coupler385/51, Permanently fixed coupler385/78, Fiber end held in ferrule385/84Tube-type holding structure
A temperature probe includes a sensor material optically communicating with a waveguide, and a sheath having a sheath coefficient of thermal expansion substantially matched to a thermal expansion coefficient of the waveguide. The waveguide has first and second ends secured proximate corresponding sheath ends. In another aspect of the invention, waveguide ends are secured near the sheath ends, the sheath is bent at one or more locations so that it is noncylindrical, and a midsection of the waveguide is loosely held within the bent sheath. In still another aspect of the invention, a metallic tube with the sensor material disposed therein is secured to the waveguide by direct attachment to a metallic coating on the waveguide.
Other References
"Development of a High-Temperature Fiber-Optic Thermometer Probe Using Fluorescent Decay," by K. T. V. Grattan, A. W. Palmer, and Z. Zhang, May 1991
"Optical fibre Sensing Techniques for Wide Range Temperature Measurement," by K. T. V. Grattan, A. W. Palmer and F. A. S. Al-Ramadahan, presented at Conference TEMPMEKO '90, Helsinki, Finland, Sep. 1990 in Industry and Sciences, 17-19 Sep. 1990 Helsinki, Finland by Finnish Society of Automatic Control ISBN 951-96042-2-7, pp. 182-190, 1990
SPIE-The International Society for Optical Engineering, Fiber Optic Systems for Mobile Platforms IV, Sep. 18, 1990, San Jose Calif., vol. 1369, pp.87-95
R. W. Phillips and S. D. Tilstra, Design of a Fiber Optic Temperature Sensor for Aerospace Applications, Rosemount Inc., 1992 (month not available
July 16, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
