双频干涉型光纤传感技术

Dual Frequency Interferometric Fiber-Optic Sensing Technology

光纤传感器以光波为载体、光纤为媒介实现对被测信息的感知和传输,具有抗电磁干扰、信号传输距离远、现场无需供电等优点,在国防和民用诸多领域得到了广泛应用。提出了一种新型光纤传感技术——双频干涉型光纤传感技术,该技术结合了干涉型光纤传感器与波长调制型光纤传感器的优点,不仅分辨率高,而且易于解调和复用。围绕超短腔双频光纤激光器制作、对外界敏感特性、换能机制、传感器复用技术等方面展开研究,并特别介绍了双频干涉型光纤声波/超声波传感器及其在生物光声成像等方面的应用。

Fiber-optic sensor converts measurands into a change in amplitude,phase,wavelength or polarization of light in optical fiber.It has advantages of small size,light weight,immune to electromagnetic interference,remote sensing capability,and has been widely used in civil engineering,aerospace,oil &gas,electric power,and so on.We designed a new type of fiber-optic sensor named dual frequency interferometric fiber-optic sensor,which integrates the advantages of interferometric sensor and wavelength-encoded sensor.It not only provides high resolution,but also can be easily demodulated and multiplexed.Our research focuses on the fabrication of ultra-short dual frequency fiber grating laser,its response to external perturbations,the transducer design,the sensor multiplexing,and etc.Furthermore,we will introduce the dual frequency interferometric acoustoultrasonic sensors and their applications in biological photoacoustic imaging,etc.