Patent ID: 6492636
Filing Date: 2002-12-10
Classification: G01B,G01D,G01J,G02B

Abstract:
A digital spatial and wavelength domain system for multiplexing fiber Bragg grating (FBG) sensors comprising:a plurality of optical fibers, each including a plurality of fiber Bragg gratings (FBG) therein, each FBG having selective center wavelength being variable in accordance with strain for reflecting or transmitting light at the corresponding center wavelength in accordance with the strain thereat; means for providing broad band light illumination for the FBGs; means for each optical fiber for carrying the light to a selected location; a wavelength dispersion device responsive to the light from each of the fibers for wavelength separating the light in each said fiber into the center wavelengths in accordance with the location of each fiber so that the selected location of each fiber and the wavelength separated light provides spatially independent signals for each FBG in each optical fiber.