What physical quantities do fiber grating sensors mainly detect?

Fiber Bragg grating sensor is a kind of optical fiber sensor. The sensing process based on fiber grating is to obtain sensing information by modulating fiber Bragg wavelength by external physical parameters. It is a wavelength modulated optical fiber sensor. Fiber Bragg grating sensor can directly measure physical quantities such as temperature and strain.

Fiber Bragg grating sensors can be pasted on the surface of the structure or embedded in the structure in advance, and at the same time, the structure can be tested for health, impact, shape control and vibration reduction to monitor the defects of the structure.

The grating strain gauge independently developed by Shanghai Zi Shan Optoelectronic Technology Co., Ltd. has the advantages of high precision (generally 65,438+0 μ ε, small-scale strain measurement of 0.5με), high reliability, diverse installation methods and convenient use. It has been successfully applied to a landmark building in Zhongguancun, Beijing, laid on steel beams and buried in concrete to monitor the construction process of column steel beams.

Fiber Bragg grating sensor adopts wavelength modulation mode, and measures the change of measured parameters by detecting the drift of signal wavelength.