Accuracy evaluation of a hetero-core splice fiber optic sensor

Y. Tani; H. Sasaki; Y. Kubota; K. Watanabe

doi:10.1117/12.622650

24 September 2005 Accuracy evaluation of a hetero-core splice fiber optic sensor

Y. Tani, H. Sasaki, Y. Kubota, K. Watanabe

Proceedings Volume 5952, Optical Fibers: Applications; 59520L (2005) https://doi.org/10.1117/12.622650
Event: Congress on Optics and Optoelectronics, 2005, Warsaw, Poland

Abstract

A Hetero-Core Splice Fiber Optic Sensor has a very simple structure in which a short-length, different core-size fiber is inserted in a single-mode-fiber network line with a low transmission loss for the wavelength of 1.31μm. In this study, a displacement sensor has been newly developed using a hetero-core spliced fiber optic element in a form of simple module structure and has been evaluated in terms of the accuracy as an OTDR(Optical Time Domain Reflectometer)-based measurement, for the purpose of the full-scale environmental monitoring. The developed sensor module is designed to have a coverage sensitive to a relatively large displacement in the range 0-5mm, for which a simple displacement-macrobending conversion mechanism has been adopted. A nickel alloy Invar with an extremely low linear expansion coefficient is used for the main parts of the module. Displacement is given to the module with a highly accurate micrometer of a minimum resolution of 0.5μm. The sensitivity showed a tendency proportional to the insertion length of hetero-core portion in the range from 1 to 2mm. The experiment promisingly showed sufficient reproducibility in the sensing operation with the accuracy less than 0.1% to the full span displacement of 5mm. Additionally, a pressure gauge using a hetero-core spliced fiber optic element has been newly developed in a form of module structure by applying the developed displacement sensor. The pressure gauge is designed to measure the change in length of a bellows due to pressurized air. The experiment achieved the measurement accuracy 0.3%[%FS] with highly showing the capability of all-light wave-based liquid level monitoring as a first demonstration based on a single mode fiber transmission concept, which could be very useful for environmental preservation.

Citation Download Citation

Y. Tani, H. Sasaki, Y. Kubota, and K. Watanabe "Accuracy evaluation of a hetero-core splice fiber optic sensor", Proc. SPIE 5952, Optical Fibers: Applications, 59520L (24 September 2005); https://doi.org/10.1117/12.622650

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