DFB fiber laser sensor for simultaneous measurement of acoustic and magnetic fields  

作　　者：Rui Ma Wentao Zhang Wenzhu Huang Fang Li 马瑞;张文涛;黄稳柱;李芳(State Key Laboratory of Transducer Technology, Institute of Semiconductors, Chinese Academy of Sciences;College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences)

机构地区：[1]State Key Laboratory of Transducer Technology, Institute of Semiconductors, Chinese Academy of Sciences Beijing 100083, China [2]College of Materials Science and Opto-Eleetronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China

出　　处：《Chinese Optics Letters》2018年第6期24-28,共5页中国光学快报（英文版）

基　　金：supported by the Key R&D Program of China(No.2017YFB0405503);the Youth Innovation Promotion Association of CAS(No.2016106)

摘　　要：A novel distributed feedback（DFB） fiber laser sensor, which can measure acoustic and magnetic fields simultaneously, is proposed. The magnetic field can be measured by detecting the change of resonant frequency of the fiber laser, and the acoustic pressure can be measured by detecting the phase shift of the fiber laser. Both of the signals can be simultaneously demodulated in the frequency domain without affecting each other. Experimental studies show that the acoustic pressure sensitivity of this sensor is about-130 d B（0 dB re 1 pm∕μPa） and the sensor has a good linearity with a magnetic field sensitivity of 0.57 Hz∕mT.A novel distributed feedback（DFB） fiber laser sensor, which can measure acoustic and magnetic fields simultaneously, is proposed. The magnetic field can be measured by detecting the change of resonant frequency of the fiber laser, and the acoustic pressure can be measured by detecting the phase shift of the fiber laser. Both of the signals can be simultaneously demodulated in the frequency domain without affecting each other. Experimental studies show that the acoustic pressure sensitivity of this sensor is about-130 d B（0 dB re 1 pm∕μPa） and the sensor has a good linearity with a magnetic field sensitivity of 0.57 Hz∕mT.

关 键 词：LENGTH DFB fiber laser sensor for simultaneous measurement of acoustic and magnetic fields 

分 类 号：TN248[电子电信—物理电子学] TP212[自动化与计算机技术—检测技术与自动化装置]