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An experiment was developed to relate the wavelength shifts resulting from temperature changes of fiber Bragg grating (FBGs) to the thermal expansion coefficients. The range of the temperature is set from -60 °C to 100 °C as the simulation of outer space temperature environment and the experiment results show that the primary wavelength shift of this sensor due to temperature changing is more precise with the secondary polynomial fitting than the theory relatively linear fitting. Consequently, the reason of the difference between the theoretic and the experiment calculation has been analyzed.

Investigation on Temperature Sensitivity of Fiber Bragg Grating Sensor under Global Temperature Variations Experience