Distributed fiber optic temperature sensor based on time domain transmission
Patent 5035511 Issued on July 30, 1991. Estimated Expiration Date: 
April 10, 2010. 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.
April 10, 2010. 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.Patent ReferencesPlural frequency oscillator employing multiple fiber-optic delay line Pyrometer system using separated spectral components from a heat source Wavelength dependent, tunable, optical time delay system for electrical signals Distributed temperature sensor with optical-fiber sensing element Multiple point remote temperature sensing System for remote sensing of a physical parameter Patent #: 4916643 InventorApplicationNo. 507325 filed on 04/10/1990US Classes:374/124, With scanning or temperature distribution display250/227.12, Optical delay line374/131, With radiation conducting element374/137Temperature distribution or profileExaminersPrimary: Cuchlinski, William A. Jr.Assistant: Gutierrez, Diego Attorney, Agent or FirmForeign Patent References
International ClassG01K 011/00AbstractAn apparatus and method for sensing temperature of a surface comprises a plurality of time domain intensity transmission networks. Each network comprises pairs of fiber optic power dividers which are connected to each other by bridges. One power divider in each pair is connected in a series by delay lines that form an output bus for propagating a light pulse supplied to an initial power divider in the output bus. This produces a train of light pulses which are returned to a light detector by a receiving bus which interconnects the power dividers at the opposite end of each bridge. Each power divider is in thermal contact with the surface whose temperature is to be measured and the intensity of the train of light pulses is changed in accordance with changes in the temperature of the surface.Other References
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