Optical fiber sensors for measurement strain and vibration

Bretislav Mikel; Radek Helan; Zdenek Buchta; Milan Holík; Michal Jelinek; Ondrej Cip

doi:10.1117/12.2070480

6 January 2015 Optical fiber sensors for measurement strain and vibration

Bretislav Mikel, Radek Helan, Zdenek Buchta, Milan Holík, Michal Jelinek, Ondrej Cip

Proceedings Volume 9450, Photonics, Devices, and Systems VI; 94500G (2015) https://doi.org/10.1117/12.2070480
Event: Photonics Prague 2014, 2014, Prague, Czech Republic

Abstract

We present optical fiber sensors to measurement strain and vibration. The sensors are based on fiber Bragg gratings (FBG). We prepared construction of strain sensors with respect to its implementation on the outer surface of concrete structures and with compensation of potential temperature drifts. These sensors are projected with look forward to maximal elongation and strength which can be applied to the sensor. Each sensor contains two optical fibers with FBGs. One FBG is glued into the sensor in points of fixation which are in the line with mounting holes. This FBG is prestressed to half of measurement range, than the stretching and pressing can be measured simultaneously by one FBG. The second FBG is placed inside the sensor without fixation to measure temperature drifts. The sensor can be used to structure health monitoring. The sensors to measurement vibration are based on tilted fiber Bragg grating (TFBG) with fiber taper. The sensor uses the TFBG as a cladding modes reflector and fiber taper as a bend-sensitive recoupling member. The lower cladding modes (ghost), reflected from TFBG, is recoupled back into the fiber core via tapered fiber section. We focused on optimization of TFBG tilt angle to reach maximum reflection of the ghost and taper parameters. In this article we present complete set-up, optical and mechanical parameters of both types of sensors.

Citation Download Citation

Bretislav Mikel, Radek Helan, Zdenek Buchta, Milan Holík, Michal Jelinek, and Ondrej Cip "Optical fiber sensors for measurement strain and vibration", Proc. SPIE 9450, Photonics, Devices, and Systems VI, 94500G (6 January 2015); https://doi.org/10.1117/12.2070480

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