Analysis, compensation, and correction of temperature effects on FBG strain sensors

T. C. Haber; S. Ferguson; D. Guthrie; T. W. Graver; B. J. Soller; Alexis Mendez

doi:10.1117/12.2018772

29 May 2013 Analysis, compensation, and correction of temperature effects on FBG strain sensors

T. C. Haber, S. Ferguson, D. Guthrie, T. W. Graver, B. J. Soller, Alexis Mendez

Proceedings Volume 8722, Fiber Optic Sensors and Applications X; 872206 (2013) https://doi.org/10.1117/12.2018772
Event: SPIE Defense, Security, and Sensing, 2013, Baltimore, Maryland, United States

Abstract

One of the most common fiber optic sensor (FOS) types used are fiber Bragg gratings (FBG), and the most frequently measured parameter is strain. Hence, FBG strain sensors are one of the most prevalent FOS devices in use today in structural sensing and monitoring in civil engineering, aerospace, marine, oil and gas, composites and smart structure applications. However, since FBGs are simultaneously sensitive to both temperature and strain, it becomes essential to utilize sensors that are either fully temperature insensitive or, alternatively, properly temperature compensated to avoid erroneous measurements. In this paper, we introduce the concept of measured “total strain”, which is inherent and unique to optical strain sensors. We review and analyze the temperature and strain sensitivities of FBG strain sensors and decompose the total measured strain into thermal and non-thermal components. We explore the differences between substrate CTE and System Thermal Response Coefficients, which govern the type and quality of thermal strain decomposition analysis. Finally, we present specific guidelines to achieve proper temperature-insensitive strain measurements by combining adequate installation, sensor packaging and data correction techniques.

Citation Download Citation

T. C. Haber, S. Ferguson, D. Guthrie, T. W. Graver, B. J. Soller, and Alexis Mendez "Analysis, compensation, and correction of temperature effects on FBG strain sensors", Proc. SPIE 8722, Fiber Optic Sensors and Applications X, 872206 (29 May 2013); https://doi.org/10.1117/12.2018772

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