Transmission/reflection-type hybrid extrinsic Fabry-Perot interferometric optical fiber sensors

Sang-Hoon Kim; Jung-Ju Lee

doi:10.1117/12.472635

27 June 2002 Transmission/reflection-type hybrid extrinsic Fabry-Perot interferometric optical fiber sensors

Sang-Hoon Kim, Jung-Ju Lee

Proceedings Volume 4694, Smart Structures and Materials 2002: Smart Sensor Technology and Measurement Systems; (2002) https://doi.org/10.1117/12.472635
Event: SPIE's 9th Annual International Symposium on Smart Structures and Materials, 2002, San Diego, California, United States

Abstract

Most interferometric optical fiber sensors, including the extrinsic Fabry-Perot interferometric (EFPI) sensor, measure strain or temperature with only interferometric fringes. Thus the measurement direction such as tension/compression of strain or increase/decrease of temperature is difficult to be distinguished. The EFPI optical fiber sensor has been constructed with the transmission-type structure to compensate this disadvantage. In the transmission-type EFPI (TEFPI) optical fiber sensor, the additional signal level variation in the fringe signal presents the measurement direction information. However, the TEFPI optical fiber sensor has low visibility of the interferometric fringes, and requires somewhat sophisticated signal processing to distinguish the measurement direction changes. In this study, the hybrid extrinsic Fabry-Perot interferometric optical fiber sensor is presented, from which the transmission-type and reflection-type sensor signals can be simultaneously acquired. To detect peaks and valleys in the interferometric fringes, the reflection-type signal with relatively higher visibility is processed. The measurement direction is determined by the linear combination of the transmission-type and reflection-type signals, which presents the signal level variation with minimum fringe amplitude. Because the hybrid sensor uses the separated signals containing measurement quantity and direction information, its signal processing is more robust than one of the TEFPI sensor.

Citation Download Citation

Sang-Hoon Kim and Jung-Ju Lee "Transmission/reflection-type hybrid extrinsic Fabry-Perot interferometric optical fiber sensors", Proc. SPIE 4694, Smart Structures and Materials 2002: Smart Sensor Technology and Measurement Systems, (27 June 2002); https://doi.org/10.1117/12.472635

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