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Proceedings Paper

A fiber-optic CT using a reflection type Sagnac coil and a time-delayed sampling demodulation
Author(s): Hyoung Jun Park; Hyun-Jin Kim; Yo Han Cho; Minho Song
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Paper Abstract

We propose a fiber-optic interferometric CT that uses a time-delayed sampling signal processing to extract the current-induced phase information. The interference signal of the reflection type Sagnac sensor coil is sampled with a carefully adjusted time delay. And the phase is extracted by using an arctangent demodulation. The accuracy comparison between the proposed and a lock-in amplifier demodulation showed the feasibility of the proposed technique. Also the outputs from a flint glass sensor coil and a standard fiber sensor coil were compared in the same condition, proving the low birefringence of the flint glass shows the better performance. The phase measurement accuracy of the proposed demodulation technique was about 8.09 mrad.

Paper Details

Date Published: 5 October 2009
PDF: 4 pages
Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 750338 (5 October 2009); doi: 10.1117/12.835303
Show Author Affiliations
Hyoung Jun Park, Chonbuk National Univ. (Korea, Republic of)
Hyun-Jin Kim, Chonbuk National Univ. (Korea, Republic of)
Yo Han Cho, Chonbuk National Univ. (Korea, Republic of)
Minho Song, Chonbuk National Univ. (Korea, Republic of)


Published in SPIE Proceedings Vol. 7503:
20th International Conference on Optical Fibre Sensors
Julian D. C. Jones, Editor(s)

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