Multi longitudinal mode beat frequency fiber laser displacement sensor based on substrate

Yu Tao; Guo Yu; Ni Yi

doi:10.3788/IRLA201948.0322001

A kind of optical fiber laser displacement sensor with multi longitudinal mode beat frequency was proposed and designed. The sensor could be realized by using the beat frequency signal between different modes in the resonator to monitor the small displacement of the object. The sensor used a strain sensing substrate structure to effectively protect the optical fiber and buffer the deformation caused by stretching and compression, and increase the sensitivity of the sensor. At the same time, the original multi longitudinal mode beat fiber laser was improved, which made the system get higher signal-to-noise ratio. The measuring principle of multi longitudinal mode beat sensor was described, and strain gage was designed and built. In the experiment, four different beat frequency signals were selected as sensing signals. The experimental data show that the frequency shift is basically linear in the range of 0 to 30 mm, and the highest linear fitting degree can reach 0.999 4, which is in agreement with the theoretical results. Because the precision of the stretching platform is limited, the measuring accuracy of the sensor is 110-3 mm. Repeated experiments show that the sensor has good stability.

Multi longitudinal mode beat frequency fiber laser displacement sensor based on substrate

1. School of Internet of Things Engineering,Jiangnan University,Wuxi 214122,China

Received Date: 2018-10-10

Rev Recd Date: 2018-11-25

Publish Date: 2019-03-25

Key words:

Abstract: A kind of optical fiber laser displacement sensor with multi longitudinal mode beat frequency was proposed and designed. The sensor could be realized by using the beat frequency signal between different modes in the resonator to monitor the small displacement of the object. The sensor used a strain sensing substrate structure to effectively protect the optical fiber and buffer the deformation caused by stretching and compression, and increase the sensitivity of the sensor. At the same time, the original multi longitudinal mode beat fiber laser was improved, which made the system get higher signal-to-noise ratio. The measuring principle of multi longitudinal mode beat sensor was described, and strain gage was designed and built. In the experiment, four different beat frequency signals were selected as sensing signals. The experimental data show that the frequency shift is basically linear in the range of 0 to 30 mm, and the highest linear fitting degree can reach 0.999 4, which is in agreement with the theoretical results. Because the precision of the stretching platform is limited, the measuring accuracy of the sensor is 110-3 mm. Repeated experiments show that the sensor has good stability.

HTML

Reference (14)

[1]	Kashyap R, Armitage J R, Wyatt R, et al. All-fibre narrowband reflection gratings at 1500 nm[J]. Electronics Letters, 1990, 26(11):730-732.
[2]	Meltz G, Morey W W, Glenn W H. Formation of Bragg gratings in optical fibers by a transverse holographic method[J]. Optics Letters, 1989, 14(15):823-825.
[3]	Ball G A, Meltz G, Morey W W. Polarimetric heterodyning Bragg-grating fiber-laser sensor[J]. Optics Letters, 1993, 18(22):1976.
[4]	Zhang Y, Chen X, Zhang J, et al. A low-cost FDM system for multi-longitudinal mode fiber laser sensor array[J]. IEEE Photonics Technology Letters, 2015, 27(20):2186-2189.
[5]	Qin Yixuan, Ni Yi, Yao Huixuan. Design of laser array based on REC technology[J]. Infrared and Laser Engineering, 2017, 46(10):1005002. (in Chinese)秦逸轩, 倪屹, 姚辉轩. 基于REC技术的激光器阵列传感系统设计[J]. 红外与激光工程, 2017, 46(10):1005002.
[6]	Zhang Jintao. Research and application of key technologies of fiber grating sensor reuse[D]. Hefei:Hefei University of Technology, 2015. (in Chinese)张金涛. 光纤光栅传感器复用关键技术的研究与应用[D]. 合肥:合肥工业大学, 2015.
[7]	Liu Shengchun. Research of fiber laser sensing technology based on beat frequency demodulation technology[D]. Nanjing:Nanjing University, 2011. (in Chinese)刘盛春. 基于拍频解调技术的光纤激光传感技术研究[D]. 南京:南京大学, 2011.
[8]	Gao L, Huang L, Chen L, et al. Study on fiber ring laser in sensing application with beat frequency demodulation[J]. Optics Laser Technology, 2013, 45(1):137-141.
[9]	Wu Jing, Wu Hanping, Huang Junbin, et al. Research progress in signal demodulation technology of fiber Bragg grating sensors[J]. Chinese Optics, 2014, 7(4):519-531. (in Chinese)吴晶, 吴晗平, 黄俊斌,等. 光纤光栅传感信号解调技术研究进展[J]. 中国光学, 2014, 7(4):519-531.
[10]	Xu Ning, Dai Ming. Design of distributed optical fiber sensor for temperature and pressure measurement[J]. Chinese Optics, 2015, 8(4):629-635. (in Chinese)徐宁, 戴明. 分布式光纤温度压力传感器设计[J]. 中国光学, 2015, 8(4):629-635.
[11]	Yu X, Dong X, Chen X, et al. Large-scale multi-longitudinal mode fiber laser sensor array with wavelength/frequency division multiplexing[J]. Journal of Lightwave Technology, 2017, 99:1-1.
[12]	Guo Yongxing, Xiong Li, Kong Jianyi, et al. Sliding type fiber Bragg grating displacement sensor[J]. Optics and Precision Engineering, 2017, 25(1):50-58. (in Chinese)郭永兴, 熊丽, 孔建益, 等. 滑动式光纤布拉格光栅位移传感器[J]. 光学精密工程, 2017, 25(1):50-58.
[13]	Liang Lili, Liu Mingsheng, Li Yan, et al. Study on strain and cross sensitivity of long period fiber grating temperature sensor[J]. Infrared and Laser Engineering, 2015, 44(3):1020-1023. (in Chinese)梁丽丽, 刘明生, 李燕,等. 长周期光纤光栅温度传感器应变交叉敏感的研究[J]. 红外与激光工程, 2015, 44(3):1020-1023.
[14]	Li Xiaobin, Song Jianzhong, Guo Yubin, et al. Optical code division multiple access technology and its applications[J]. Optics and Precision Engineering, 2002, 10(5):487-492. (in Chinese)李晓滨, 宋建中, 郭玉彬,等. 光CDMA技术及其应用[J]. 光学精密工程, 2002, 10(5):487-492.

Multi longitudinal mode beat frequency fiber laser displacement sensor based on substrate

doi: 10.3788/IRLA201948.0322001

Abstract

References

Proportional views

通讯作者: 陈斌, bchen63@163.com

Article Metrics

Related

Proportional views