Our R&D team are working to develop an interrogator to read out the pointwise temperature and strain FBG (Fiber Bragg Grating) optical sensors. The interrogation unit sends light down the optical fibre and accurately measures the wavelengths of the light reflected back from each of the FBGs.

There are two common structure for interrogating  multiple sensors with different Bragg wavelengths along a single fiber:

  1. The first method employ a broadband source and a CCD sensing device. This structure benefits fast measurement of FBGs but have limited accuracy.
  2. The second method utilize a tunable laser source and a single photodetector as a sensing device. This structure make it possible to measure with high accuracy over longer distances of fiber optic.

NCS Innovations have a good research in both of these structures.