Study of frequency-modulated fiber optic sensor used in smart structures

Changchun Li; Fei Luo; Baoqi Tao; Junbiao Xia; Song Wu

doi:10.1117/12.212629

23 June 1995 Study of frequency-modulated fiber optic sensor used in smart structures

Changchun Li, Fei Luo, Baoqi Tao, Junbiao Xia, Song Wu

Proceedings Volume 2545, Interferometry VII: Applications; (1995) https://doi.org/10.1117/12.212629
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

In order to advance the safety of some important structures that will be required to perform under increasingly stringent conditions, it will be necessary to use materials that are lighter weight, have superior strength, and have the ability to change such parameters as shape, degree of stiffness, and electrical and mechanical properties as needed. These future materials had been named 'smart' material. It is important to measure strain within the materials. A fiber optic sensor may be used to support the necessary sensing functions of these 'smart' materials and has several compelling advantages with respect to electrical alternatives, which are tolerant to corrosion, resisted to disturvance of electric and magnetic, easily to be embedded into composites. Unless the (pi) /2 nonreciprocal phase bias and the phase shifting become a problem, interferometers using single mode fibers as optical propagation paths will be superior. It is well known that the oscillating frequency of coupled cavity semiconductor laser can be modulated by induced current. In this paper we studied the coherent frequency modulated heterodyne interferometer, (used to overcome the problem of (pi) /2 nonreciprocal phase bias, and the phase shifting problem without help of active control by ceramics), and the measuring of strain of smart structures when embedded into materials. The maximum defection range is limited by the coherent length and the dependence of the semiconductor laser.

Citation Download Citation

Changchun Li, Fei Luo, Baoqi Tao, Junbiao Xia, and Song Wu "Study of frequency-modulated fiber optic sensor used in smart structures", Proc. SPIE 2545, Interferometry VII: Applications, (23 June 1995); https://doi.org/10.1117/12.212629

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