an signal processing device of multi fiber bragg grating sensor using CDMA

摘要

PURPOSE: A device for processing a signal of a multi optic fiber bragg grating sensor using a code division multiplexing method is provided to make a constitution simple and make a price low by applying a CDMA(Code Division Multi Access) method using a light emitting diode as a light source, thereby separating a mixed signal being reflected in a multi sensor into an individual signal. CONSTITUTION: A pseudo random number bit generator(11) is provided for generating a bit signal of a pseudo random number. A light emitting diode(12) generates a light in accordance with the pseudo random number bit generated in the pseudo random number bit generator(11). A coupler(13) inputs an optical signal generated in the light emitting diode(12) in an optic fiber bragg grid sensor unit(14) and inputs the optical signal being reflected in the optic fiber bragg grid sensor unit(14) in an optic fiber bragg filter. The optic fiber bragg grid sensor unit(14) receives an optical signal through an optic fiber connected to the coupler(13). An optic fiber bragg grid filter unit(15) performs a filtering of the optical signal reflected in the optic fiber bragg grid sensor unit(14) and outputted through the coupler(13). A photodetector(16) converts the optical signal being outputted in the optic fiber bragg grid filter unit(15) into an electric signal. A delay(17) delays a pseudo random number signal outputted in the pseudo random number bit generator(11). A mixer(18) mixes signals being outputted in the delay(17) and the photodetector(16). An integrator(19) integrates a signal being outputted in the mixer(18).