| US 7,512,292 B2 | ||
| Multi-core strain compensated optical fiber temperature sensor | ||
| Trevor MacDougall, Simsbury, Conn. (US); Edward Dowd, Madison, Conn. (US); and Domino Taverner, Delray Beach, Fla. (US) | ||
| Assigned to Weatherford/Lamb, Inc., Houston, Tex. (US) | ||
| Filed on Sep. 12, 2006, as Appl. No. 11/531,145. | ||
| Prior Publication US 2008/0063337 A1, Mar. 13, 2008 | ||
| Int. Cl. G02B 6/00 (2006.01); G02B 6/22 (2006.01); G02B 6/34 (2006.01) | ||
| U.S. Cl. 385—12 [385/24; 385/37; 385/126] | 8 Claims |
| 1. A system for sensing temperature in a wellbore, comprising:
a temperature sensor disposed in the wellbore, wherein the temperature sensor comprises first and second Bragg gratings disposed
respectively in first and second cores within a unitary structure and has a characteristic such that the Bragg gratings provide
different responses to temperature; and
signal processing equipment configured to analyze the signals to determine a temperature measurement, wherein the temperature
measurement is compensated for strain at the sensor based on similar strain effects on both the first and second signals.
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