A comparative study of digital image correlation, strain gauge, and extensometer for calibration of fiber Bragg grating sensors

Pashaie Rasoul, Mirzaei A.H., Vahedi M., Shokrieh M.M.

For Russian citation (Opticheskii Zhurnal):

Pashaie R., Mirzaei A.H., Vahedi M., Shokrieh M.M. A comparative study of digital image correlation, strain gauge, and extensometer for calibration of fiber Bragg grating sensors (Сравнительное исследование калибровки волоконных датчиков с брэгговской решеткой с помощью тензометрического датчика и экстензометра с использованием метода цифровой корреляции изображений) [in English] // Оптический журнал. 2026. Т. 93. № 1. С. 12–22. http://doi.org/10.17586/1023-5086-2026-93-01-12-22

For citation (Journal of Optical Technology):

Abstract:

Subject of study. A method for calibrating temperature sensors and stress sensors based on fiber Bragg grating sensors. Purpose of the work. Comparison of the efficiency of various sensor calibration methods, in particular hardware-based methods based on strain gauges with a sensitive element in the form of a metal foil, an extensometric device, and software-based methods based on the correlation of recorded digital images. Method. The strain calibration experiments were conducted on metallic and laminated carbon/epoxy specimens in four monotonic tensile tests. Additionally, the temperature calibration for fiber Bragg grating sensors was carried out using a controlled oven. Main results. The digital image correlation method showed greater deviation than the other methods, which could be due to the lower sensitivity of this method to such a range of strains in this special test. The results show remarkable conformity between fiber Bragg grating sensors and strain gauge data. The strain and temperature sensitivities of 0.85 pm/µe and 11.9 pm/degree are obtained for the used sensors, respectively. Practical significance. Calibration of fiber Bragg grating sensors, before installing and embedding into the structures, to temperature and strain using a reliable method has always been one of the concerns of active researchers in this field. This article has compared mechanical and optical methods in the same tests.

Keywords:

calibration, fiber Bragg grating, strain gauge, extensometer, digital image correlation method, strain, temperature

OCIS codes: 060.2370, 060.4370, 060.2300

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