基于SCBSS信号处理技术的SMS多参量光纤传感系统

Multi-parameters SMS optical fiber sensing by employing SCBSS signal processing technique

基于单通道盲信号分离技术(Single Channel Blind Source Separation,SCBSS)及单模-多模-单模(Single-mode-Multimode-Single-mode,SMS)光纤结构的模间干涉理论,提出了一种多参量光纤传感技术,实现了振动与应力、振动与温度的同时测量。在振动与应力同时测量时,振动频率误差为0.17 Hz,分离出的应力信号与实验操作吻合。在振动与线性降温、自然升温同时测量实验中,振动频率误差均在0.60Hz以内。线性降温时,温度误差在7.13%以内;自然升温时,温度误差在8.03%以内。该方法结构简单,成本低廉,精度高,可推广用于其他光纤传感系统,实现多参量同时测量。

The technique was presented to simultaneously measure the vibration and strain, vibration and temperature with the Single-mode-Multimode-Single-mode （SMS） fiber structure by employing a kind of digital signal processing technique of Single Channel Blind Source Separation （SCBSS）. In the simultaneous measurements of the vibration and stress, the measurement error of vibration frequency was only about 0.17 Hz and the load time of the stress was exactly same as the operation. In the simultaneous measurement of the vibration and temperature, the error of the vibration frequency was less than 0.60 Hz, and the temperature error were less than 7.13% and 8.03% for linear cooling and natural warming,respectively. The SMS optical fiber sensing can measure multi-parameters easily with low cost and high accuracy by employing the SCBSS, which can be used in other optical fiber sensing systems to obtain multi-parameters.