U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Distributed fiber optic temperature sensor based on time domain transmission

Patent 5035511 Issued on July 30, 1991. Estimated Expiration Date: Icon_subject 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 References

Plural frequency oscillator employing multiple fiber-optic delay line
Patent #: 4297656
Issued on: 10/27/1981
Inventor: Pan

Pyrometer system using separated spectral components from a heat source
Patent #: 4326798
Issued on: 04/27/1982
Inventor: Kahn

Wavelength dependent, tunable, optical time delay system for electrical signals
Patent #: 4671604
Issued on: 06/09/1987
Inventor: Soref

Distributed temperature sensor with optical-fiber sensing element
Patent #: 4830513
Issued on: 05/16/1989
Inventor: Grego

Multiple point remote temperature sensing
Patent #: 4878226
Issued on: 10/31/1989
Inventor: McQuoid, et al.

System for remote sensing of a physical parameter Patent #: 4916643
Issued on: 04/10/1990
Inventor: Ziegler, et al.

Inventor

Application

No. 507325 filed on 04/10/1990

US Classes:

374/124, With scanning or temperature distribution display250/227.12, Optical delay line374/131, With radiation conducting element374/137Temperature distribution or profile

Examiners

Primary: Cuchlinski, William A. Jr.
Assistant: Gutierrez, Diego

Attorney, Agent or Firm

Foreign Patent References

  • 0076826 JP 06/11/1977
  • 0140031 JP 06/11/1989

International Class

G01K 011/00

Abstract

An 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

  • Spillman, Jr., W. B. and Lord, J. R., "Self-Referencing Multiplexing Technique for Fiber-Optic Intensity Sensors", J. of Lightwave Technology, vol. LT-5, pp. 865-869, 1987
  • Johnson, L. M. et al., "Integrated Optical Temperature Sensor," Appl. Phys. Lett., vol. 41, No. 2 (Jul. 1982)
  • Callahan, R. W., "Optical Delay Line Compressor," IBM Technical Disclosure Bulletin, vol. 14, No. 8 (Dec. 1971
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