CAJ | 학술논문

在基于微波电光调制的布里渊光时域反射分布式温度传感系统中，使用微波扫频会造成电光调制器输出的参考光功率波动，根据相干检测的原理，参考光功率的波动会影响到测得的后向布里渊散射信号的功率，将直接影响布里渊散射谱的测量精度，导致较大的温度测量误差。因此，提出一种根据电光调制器输出光功率反馈调节微波源功率，以稳定布里渊光时域反射系统参考光功率的方法。实验结果表明，该方法可以有效抑制电光调制器输出的一阶边波带峰值功率的波动，使系统的温度测量精度从6℃提高到了2℃。
재기우미파전광조제적포리연광시역반사분포식온도전감계통중，사용미파소빈회조성전광조제기수출적삼고광공솔파동，근거상간검측적원리，삼고광공솔적파동회영향도측득적후향포리연산사신호적공솔，장직접영향포리연산사보적측량정도，도치교대적온도측량오차。인차，제출일충근거전광조제기수출광공솔반궤조절미파원공솔，이은정포리연광시역반사계통삼고광공솔적방법。실험결과표명，해방법가이유효억제전광조제기수출적일계변파대봉치공솔적파동，사계통적온도측량정도종6℃제고도료2℃。
In the distributed temperature sensing system of Brillouin optical time domain reflectometer based on the electro-optical modulation, the power of reference light exported from the electro-optic modulator will fluctuate while using microwave sweeper. According to the principle of correlation detection, the fluctuations of reference light power will affect the power of Brillouin scattering light,and it will cause large error in temperature measurement. Therefore, a method that can adjust the microwave power based on the output light power feedback of electro-optic modulator has been proposed to keep the power of reference light of Brillouin optical time domain reflectometer stable. The experimental results show that the method can suppress the fluctuation of the first-order edge wave band peak power exported from the electro-optic modulator effectively, and the temperature measuring accuracy has been increased from 6℃to 2℃.