The average temperature sensitivity coefficient of fiber Bragg gratings(FBG) η and the wavelength drift with temperature Δλc were tested from 20-260 ℃ respectively.

Analysis on influence of clad materials on temperature sensitivity of fiber bragg grating;

The analysis of the experimental results shows that the desirable thickness of metallic protective layer can be obtained by this method,and the temperature sensitivity is improved too.

In order to explore the temperature sensitivity of fiber bragg grating(FBG) in smart metal structure,the stress and strain of FBG under temperature variation must be analyzed.

These restrictive con d itions can be taken as practical design criteria for avoiding reactor instabilit y and temperature sensitivity in multitubular packed-bed reactors.

Based on the Kirchhoff law, according to the relationships between various technical parameters and main specifications (limited temperature measurement sensitivity, temperature measurement accuracy, temperature measurement range), an optimal working wavelength of the practical real time temperature measurement system using laser diode and LiTaO 3 pyroelectric detector is proposed.