An all-fiber vacuum sensor based on thermo-optics' effect in vanadium-doped fiber

Ziga Matjasec; Denis Donlagic

doi:10.1117/12.2053776

15 May 2014 An all-fiber vacuum sensor based on thermo-optics' effect in vanadium-doped fiber

Ziga Matjasec, Denis Donlagic

Proceedings Volume 9141, Optical Sensing and Detection III; 91411R (2014) https://doi.org/10.1117/12.2053776
Event: SPIE Photonics Europe, 2014, Brussels, Belgium

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.

Citation Download Citation

Ziga Matjasec and Denis Donlagic "An all-fiber vacuum sensor based on thermo-optics' effect in vanadium-doped fiber", Proc. SPIE 9141, Optical Sensing and Detection III, 91411R (15 May 2014); https://doi.org/10.1117/12.2053776

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available