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Fiber Optic Vibration Sensor Based on Fiber Laser

Author: WangHongJun
Tutor: GuanBaiOu
School: Dalian University of Technology
Course: Optical Engineering
Keywords: DBR fiber laser Polarization beat Vibration sensor
CLC: TP212
Type: Master's thesis
Year: 2009
Downloads: 381
Quote: 2
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Abstract


In recent years , with the rapid development of the field of aviation, aerospace, bridges , civil construction , the consequent mechanical vibration problem has become more complex, so the higher vibration sensor measurement accuracy , sensitivity and performance requirements , now commonly used electromagnetic class vibration sensors can not meet these requirements. Has become particularly important to the research and development of new higher-quality vibration sensors . In this paper, and the production of a new fiber - optic laser - based optical fiber vibration sensor , and test its response characteristics . The main contents are as follows: (1 ) After a brief introduction , the development of fiber lasers , classification and design principles of distributed Bragg reflector (DBR) fiber laser , the paper proposes a 193nm UV laser scanning to inscribe fiber Bragg grating (FBG) technology, the use of this technique to produce there are reports of the cavity length of the shortest of the DBR fiber laser , this laser a total length of only 14mm , and its output power can reach 2.66dBm . (2) first proposed the orthogonal polarization dual-band DBR fiber laser - based optical fiber vibration sensor , its working principle is the acceleration converted to fiber laser polarization beat frequency of changes , informed of the magnitude of the acceleration by monitoring the beat frequency signal . Derivation of the DBR fiber laser beat frequency relationship between changes in the amount of acceleration , given the sensitivity of the expression , and to discuss the impact sensor natural frequency and sensitivity factors . (3) the actual production of the two different parameters of the fiber laser vibration sensor, to test its response characteristic . We produced two fibers inherent frequency of the vibration sensor respectively, 129Hz , 131Hz , and sensitivity respectively, S = 194MHz / ( m / s ~~ 2 ) , 365MHz / (m / s 2) . The tests show that this new type of optical fiber vibration sensor with high acceleration response sensitivity , its sensitivity is much higher than the sensitivity of 1000mV / g commercial piezoelectric accelerometer .

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation components,parts > Transmitter ( converter),the sensor
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