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Fiber Optic Sensing Applications Based on Optical Propagation Mode Time Delay Measurement
Author(s)
Yupapin, P. P.
Piengbangyang, S.
Date Issued
March 1, 2001
Type
Article
Abstract
This paper presents the study of the feasibility of using a linearly polarized, highly coherent source, ie HeNe laser with wavelength of 632.8 nm, to produce the optical mode delay time in an optical fiber for the use of sensing applications. Results obtained have shown that the propagation mode delay time measurement in term of optical path difference of 50 µm was achieved respect to the external applied force of 5 N, on the sensing fiber. Other sensing applications such as displacement and bending sensors were also investigated, where the change in optical path difference in term of output detected mode shift of 70 µm was recorded associating with the sensing displacement. The limitation of this measurement due to the sensing fiber bending radius of 2 mm was noted.
Citation
Scienceasia, 27(1), 35-40, 2001