PROBE USING BRAGG GRATING AND FABRY PEROT INTERFEROMETER, FIBER SENSOR SYSTEM AND SENSING METHOD THEREOF

摘要

the present invention is an optical fiber sensor in the measured water temperature and load all the strains derived by considering some the more accurate the strain has an effect that can be measured. To this end in particular, the Bragg grating 312 in a predetermined portion of the Bragg reflected light sikimyeo imbedded wavelength light which proceeds to the total reflection in the inside, the wavelength band of the Bragg wavelength light on the basis of the thermal energy into and out of a single optical fiber in a reversible change ( 300); And the Bragg grating is spaced apart a certain distance in a direction of (312) is provided on the optical fiber (300), Bragg grating (312) in order to induce the interference of transmitted light passing through the Bragg wavelength light with a Bragg grating 312 is reflected a mirror 314 for reflecting the transmitted light; and include, as part of the optical fiber spaced apart a predetermined distance to be measured Bragg gratings and Fabry, characterized in that the optical fiber has a bonding portion for measuring the strain of water 350 with an interference losses The fiber optic sensor probe is started.