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Sensors 2010, 10(7), 6582-6593; doi:10.3390/s100706582
Article

Error Analysis and Measurement Uncertainty for a Fiber Grating Strain-Temperature Sensor

1
 and
2,*
1 Department of Physics, National Chung Cheng University, 168 University Road, Chia-Yi 62102, Taiwan 2 Department of Construction Engineering, National Yunlin University of Science and Technology, 123 Section 3 University Road, Douliou 64002, Taiwan
* Author to whom correspondence should be addressed.
Received: 20 April 2010 / Revised: 17 June 2010 / Accepted: 2 July 2010 / Published: 9 July 2010
(This article belongs to the Section Chemical Sensors)
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Abstract

A fiber grating sensor capable of distinguishing between temperature and strain, using a reference and a dual-wavelength fiber Bragg grating, is presented. Error analysis and measurement uncertainty for this sensor are studied theoretically and experimentally. The measured root mean squared errors for temperature T and strain ε were estimated to be 0.13 °C and 6 με, respectively. The maximum errors for temperature and strain were calculated as 0.00155 T + 2.90 × 106 ε and 3.59 × 105 ε + 0.01887 T, respectively. Using the estimation of expanded uncertainty at 95% confidence level with a coverage factor of k = 2.205, temperature and strain measurement uncertainties were evaluated as 2.60 °C and 32.05 με, respectively. For the first time, to our knowledge, we have demonstrated the feasibility of estimating the measurement uncertainty for simultaneous strain-temperature sensing with such a fiber grating sensor.
Keywords: fiber Bragg grating; sensor; strain; temperature; error analysis; measurement uncertainty fiber Bragg grating; sensor; strain; temperature; error analysis; measurement uncertainty
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Tang, J.-L.; Wang, J.-N. Error Analysis and Measurement Uncertainty for a Fiber Grating Strain-Temperature Sensor. Sensors 2010, 10, 6582-6593.

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