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Proceedings Paper

An all-fiber vacuum sensor based on thermo-optics' effect in vanadium-doped fiber
Author(s): Ziga Matjasec; Denis Donlagic
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Paper Abstract

This paper introduces an all-optical, fiber-optics vacuum sensor, which takes advantage of the thermo-optic effect within vanadium-co-doped fiber. This sensor utilizes a 980 nm pump-diode and a short section of highly absorbing vanadiumco- doped fiber produced by the flash vaporization process. The 980 nm source operates in pulse mode therefore the vanadium-co-doped fiber is periodically heated and self-cooled. The 980 nm pump-light is fully absorbed within the codoped fiber’s core and relaxed as a heat, which changes the fiber’s core refractive index. The heat-transfer between the heated fiber and surrounding gas depends on the gas pressure. Further, the doped-fiber is inserted into a Fabry-Perot interferometer which forms, in combination with a DFB laser diode at 1550 nm, a high coherence interferometer for optical path-length measurement. The time constant and absolute modulated optical path of the step response can be directly correlated with the gas pressure. The time constant is independent of the pump-diode’s optical power, while the absolute modulated optical path also depends on the pump-diode’s output of optical power and should thus be compensated. The vacuum sensor allows for a remote and fully dielectric measurement of the gas pressure and can be used in various industrial applications.

Paper Details

Date Published: 15 May 2014
PDF: 6 pages
Proc. SPIE 9141, Optical Sensing and Detection III, 91411R (15 May 2014); doi: 10.1117/12.2053776
Show Author Affiliations
Ziga Matjasec, Univ. of Maribor (Slovenia)
Denis Donlagic, Univ. of Maribor (Slovenia)

Published in SPIE Proceedings Vol. 9141:
Optical Sensing and Detection III
Francis Berghmans; Anna G. Mignani; Piet De Moor, Editor(s)

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