Optical fiber type temperature distribution measuring apparatus

Details Optical fiber type temperature distribution measuring apparatus Optical fiber type temperature distribution measuring apparatus

1993-02-17

1994-03-08

Yasich, Daniel M.

Thermal measuring and testing

Temperature measurement

In spaced noncontact relationship to specimen

374161, 385 16, G01J 510, G01N 2165

Patent

active

052921964

ABSTRACT:
An optical switch (14) is disposed with in a measuring section (3) and connected to a base portion of an optical fiber (2). The optical switch (14) includes a pair of adjusting optical fibers (15, 16) having lengths different from each other by a half of a distance resolution, and the optical switch (14) is driven by a pulse driving circuit (4) in synchronism with a semiconductor laser (5) which emits a light pulse. When the optical switch (14) is driven, either one of the adjusting optical fibers (15, 16) is selectively connected to the optical fiber (2) so that two detection routes having different lengths are formed. The temperature distribution measurement values respectively for the two detection routes and having a phase displaced from each other corresponding to the half of the distance resolution are calculated in a high speed averaging processing unit (11), and then a temperature distribution value along the optical fiber (2) is calculated in a data processing unit (12). Furthermore, a constant temperature tank (17 ) is disposed near the measuring section (3) to accommodate a predetermined segment of the optical fiber, and the temperature of the optical fiber (2) is maintained constant for the predetermined segment.

REFERENCES:
patent: 4767219 (1988-08-01), Bibby
patent: 4823166 (1989-04-01), Hartog
patent: 4984884 (1991-01-01), Ryu et al.
patent: 5102232 (1992-04-01), Tanabe et al.
"Raman Scattering Light Utilized Distribution Type Temperature Sensor", Sensor Technology, vol. 9, No. 7, pp. 30-34, May 1989.

Affiliated with

Also associated with

Rating

Optical fiber type temperature distribution measuring apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical fiber type temperature distribution measuring apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical fiber type temperature distribution measuring apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-149812