apparatus for measuring distribution temperature by using optical fiber and method of correction temperature thereof

The present invention relates to a device for measuring the distribution temperature of optical fiber, comprising: an optical circulator for outputting light, which is emitted from a light source, to an output terminal, and outputting scattered light coming reversely from the output terminal to a detection terminal; an optical switch for connecting the output terminal to either a first connection terminal or a second connection terminal; sensing optical fiber connected to the first connection terminal and the second connection terminal to extend; a temperature maintaining chamber configured to maintain some regions of the sensing optical fiber at temperature corresponding to a control signal; a filter part for filtering the scattered light outputted from the detection terminal into Rayleigh scattered light, Stokes Raman scattered light and anti-Stokes Raman scattered light and outputting the same separately; a first to a third light detector for detecting and outputting Rayleigh scattered light, Stokes Raman scattered light and anti-Stokes Raman scattered light, which are outputted from the filter part; and a processing unit for controlling the temperature maintaining chamber to be maintained at set reference temperature in a temperature correction mode, calculating the perturbation value of the scattered light and an attenuation coefficient depending on distance using a first to a third signal, which are received from the first to the third light detector by controlling the optical switch to be connected to the first connection terminal, and a fourth to a sixth signal, which are received from the first to the third light detector by controlling the optical switch to be connected to the second connection terminal, and calculating the temperature by reflecting a correction signal, which is generated by correcting the perturbation value and the attenuation coefficient of signals measured by the second light detector and the third light detector, on a signal scattered from the sensing optical fiber and reversely received in a temperature measurement mode. Therefore, provided are a device for measuring the distribution temperature of optical fiber and a temperature correcting method, wherein precision in temperature measurement can be improved. 본 발명은 분포형 광섬유 온도 측정장치에 관한 것으로서, 광원에서 출사되는 광을 출력단으로 출력하고, 출력단에서 역으로 입사되는 산란광을 검출단으로 출력하는 광써큘레이터와, 출력단을 제1접속단과 제2접속단 중 어느 하나로 접속시키는 광스위치와, 제1접속단과 제2접속단과 접속되어 연장된 센싱 광섬유와, 센싱광섬유의 일부영역을 제어신호에 대응되는 온도로 유지시킬 수 있도록 된 온도유지 챔버와,