基于高频微波技术的分布式布里渊光纤温度传感器

Distributed Brillouin Optical Fiber Temperature Sensor Based on High Frequency Microwave Technology

提出了一种基于分布式布里渊光纤传感系统的温度快速测量方案。该方案基于外差相干检测原理,利用高速脉冲检波管对布里渊散射信号进行直接探测,从而缩短了测量时间;并结合累加平均与小波变换技术,减小了布里渊散射信号中的噪声,通过对去噪后的信号进行解调实现了长距离温度测量。实验结果表明,在24.8km的长度范围内,温度测量误差小于3℃,测量时间小于3s。

A scheme for fast temperature measurement based on distributed Brillouin optical fiber sensor is proposed.The Brillouin scattering signal is detected by the high speed pulse RF detector based on the principle of heterodyne coherent detection,with which the measuring time can be decreased.Moreover,the noise of the Brillouin scattering signal is decreased by combining cumulative average technology with wavelet transform technology.Thus the de-noised signal is demodulated for temperature measurement within large distance.The experimental results make it clear that a temperature measurement error of less than 3 ℃ and a measuring time of less than 3 s can be achieved at a distance of 24.8 km.