ScienceAsia 26 (2000) : 231-235 |doi: 10.2306/scienceasia1513-1874.2000.26.231

Optical Remote Measurement Using Loop-Mirror Sensing Fibers

PP Yupapin^a,* and P Raknoi^bb

ABSTRACT: The use of a fused-tapered single mode optical fiber known as loop-mirrors for remote measurement device was investigated. The optical field is input into a delivery fiber then traveling into the tapered region of the sensing device and evanescent into the air-glass boundary region which affects the optical coupling power. In applications, loop mirrors device was fabricated and connected to the one end of the sensor system, where the reflected coupling power was detected by using the optical time domain reflectometer (OTDR). The relationship between the change of the reflected output power may be related to the change of the surrounding environmental parameters. Results obtained have shown the relatively change between the reflected output power and the environmental or external surrounding environments which can be tested and detected. The constructed device characteristics have shown the feasibility of using incorporating with the remote measurement system.

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a Lightwave Technology Research Center, Department of Applied Physics, Faculty of Science, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand.
b Department of Meteorology, Ministry of Communications, Bangkok 10110, Thailand.


* Corresponding author, E-mail: Yupapin.Preecha@kmitl.ac.th

Received 7 May 1999, Accepted 15 Sep 2000