Ren Zhongyao, Pan Wei, Yan Lianshan, et al. A simultaneous temperature and strain demodulation method in optical fiber sensors. [J]. (2):45-48(2010) DOI: 10.13756/j.gtxyj.2010.02.021.
A simultaneous temperature and strain demodulation method in optical fiber sensors
a method is analyzed to calculate the backscattering optical power and frequency shift by using the electric field amplitude and frequency of the microwave signals obtained by heterodyne detection.By using this method
the fairly high power microwave signals are integrated by numerical fitting and the backscattering optical power
frequency shift and the coefficient matrix changed with the temperature and strain are calculated by using the resulted DC and AC components.The numerical results show that the demodulation precisions of the temperature and strain are 1℃ and 100 με respectively
yet restrained by certain sampling frequencies.
关键词
光纤传感器布里渊散射外差检测温度与应变微波电光调制
Keywords
optical fiber sensorBrillouin scatteringheterodyne detectiontemperature and strainmicrowave electro-optic modulation