Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2005-04-19
2005-04-19
Luu, Thanh X. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C374S161000
Reexamination Certificate
active
06881948
ABSTRACT:
A fiber optic cable forms a temperature sensor arranged along an object or space to monitor the temperature thereof and detect overheating or fire conditions. An end of the sensor is connected through an interface to a laser emitter and an optical receiver, which are further connected to a computer. The computer controls the laser emitter to emit a laser pulse into the sensor. The optical receiver receives the resulting reflection signal from the sensor, and provides a corresponding signal to the computer to be evaluated in connection with a nominal comparison signal. If any location of the sensor is subjected to an unacceptable temperature increase, the sensor's refractive characteristics are changed, to cause an additional reflection pulse in the reflection signal. By evaluating the amplitude and the return time of the additional reflection pulse, the temperature level and the location of the overheating condition are determined by the computer.
REFERENCES:
patent: 4655607 (1987-04-01), Kern et al.
patent: 4673299 (1987-06-01), Dakin
patent: 4730101 (1988-03-01), Mahon et al.
patent: 4767219 (1988-08-01), Bibby
patent: 5028146 (1991-07-01), Wada
patent: 5102232 (1992-04-01), Tanabe et al.
patent: 5178465 (1993-01-01), Amano et al.
patent: 5245401 (1993-09-01), Tache et al.
patent: 5272334 (1993-12-01), Sai
patent: 5302025 (1994-04-01), Kleinerman
patent: 5306088 (1994-04-01), Zoerner
patent: 5356220 (1994-10-01), Iida et al.
patent: 5467942 (1995-11-01), Abbas et al.
patent: 5765948 (1998-06-01), Sai
patent: 5821861 (1998-10-01), Hartog et al.
patent: 5825804 (1998-10-01), Sai
patent: 6511222 (2003-01-01), Bouamra
patent: 6547435 (2003-04-01), Grosswig et al.
patent: 20040140421 (2004-07-01), Dammann
patent: 0421967 (1991-04-01), None
U.S. Appl. No. 10/706,937, (Hans-Joachim Dammann); filed Nov. 14, 2003; 20 pages specification, claims, abstract, and 1 sheet of drawings.
Airbus Deutschland GmbH
Fasse W. F.
Fasse W. G.
Luu Thanh X.
Yam Stephen
LandOfFree
Method using an optical signal for detecting overheating and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method using an optical signal for detecting overheating and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method using an optical signal for detecting overheating and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3438552