Optical Fiber Sensing System

AtGrating offers DOFS (Distributed Optical Fiber Sensing) and FBGS (Fiber Bragg Grating Sensing), which are both belong to optical fiber sensing system. 

FBGS is an optical fiber sensing technology based on the wavelength information of reflected light, and its sensing unit is fiber grating. Therefore, the physical quantity tested depends not only on the FBG interrogator, but also on the FBG. It is a short-distance fixed-point measurement (single-point or multi-point), even if it is called quasi-distributed or serial multi-point fiber gragg grating sensing, it is still point measurement, and the corresponding physical quantity can only be detected at the point where the fiber grating is engraved.

Different from FBGS, the common DOFS is a fiber sensing technology of fbg fiber optic sensor based on a variety of scattered light intensity, frequency, and phase information in the fiber, and the sensing unit is an optical fiber. In addition to relying on optical fibers, the physical quantities tested are more dependent on modulation and demodulation equipment and algorithms. The measured physical parameters are mostly the average value of physical parameters at the any section of fiber optic sensor (for example, average temperature in the range of every 1 meter on a 10-kilometer optical fiber)