Design of vibration sensor based on fiber Bragg grating

Abstract

Fiber grating is a kind of new type of fiber optic light source device which has been rapidly changing in the refractive index of the core in recent years. Especially, it can realize the high precision of the external parameters by means of the special structure design and the encapsulation technology [1, 2]. In this paper, a fiber grating vibration sensor which is suitable for vibration monitoring in key areas is designed based on the technical background of vibration monitoring system. The sensor uses a single beam structure and pastes the fiber Bragg grating (FBG) to measure the vibration wavelength on the surface. When the vibration is simply harmonic vibration, the Bragg reflection wavelength will change periodically, and the periodic variation of the wavelength curve can be measured by the fiber grating demodulator, then the correctness of the experimental results is verified. In this paper, through the analysis of the data measured by the demodulator, the MATLAB software is used to verify the data, and the different frequency domains, the modes, and the phase frequency curves are obtained. The measurement range is 0 Hz–100 Hz, and the natural frequency is 90.6 Hz.

Keywords

Vibration monitoring / fiber Bragg grating / vibration sensor / modal analysis / frequency domain

References

[1] Wu C., Zhang Y., Guan B. O.. Simultaneous measurement of temperature and hydrostatic pressure using Bragg gratings in standard and grapefruit microstructured fibers. IEEE Sensors Journal, 2011, 11(2): 489-492.

[2] Gao L., Zhu T., Deng M., Chiang K. S., Sun X. K., Dong X. P., . Long-period fiber grating within d-shaped fiber using magnetic fluid for magnetic-field detection. IEEE Photonics Journal, 2013, 4(6): 2095-2104.

[3] Su L., Elliott S. R.. All-fiber microcantilever sensor monitored by a low-cost fiber-to-tip structure with subnanometer resolution. Optics Letters, 2010, 35(8): 1212-1214.

[4] Lu P., Xu Y. P., Baset F., Bao X. Y., Bhardwaj R.. In-line fiber microcantilever vibration sensor. Applied Physics Letters, 2013, 103(21): 1.

[5] Guo T., Ivanov A., Chen C. K., Albert J.. Temperature-independent tilted fiber grating vibration sensor based on cladding-core recoupling. Optics Letters, 2008, 33(9): 1004-1006.

[6] Peng F., Yang J., Wu B., Yuan Y. G., Li X. L., Zhou A., . Compact fiber optic accelerometer. Chinese Optics Letters, 2012, 10(1): 35-37.

[7] Peng F., Yang J., Li X. L., Yuan Y. G., Wu B., Zhou A., . In-fiber integrated accelerometer. Optics Letters, 2011, 36(11): 2056-2058.

[8] Zhang Q., Zhu T., Hou Y. S., Chiang K. S.. All-fiber vibration sensor based on a Fabry–Perot interferometer and a microstructure beam. Journal of the Optical Society of America B-Optical Physics, 2013, 30(5): 1211-1215.

[9] Lin Q., Chen L. H., Li S., Wu X.. A high-resolution fiber optic accelerometer based on intracavity phase-generated carrier (PGC) modulation. Measurement Science and Technology, 2011, 22(22): 015303.

[10] Guo T., Shang L. B., Ran Y., Guan B. O., Albert J.. Fiber-optic vector vibroscope. Optics Letters, 2012, 37(13): 2703-2705.

[11] Zhang Q., Zhu T., Yin F., Chiang K. S.. Temperature-insensitive real-time inclinometer based on an etched fiber Bragg grating. IEEE Photonics Technology Letters, 2014, 26(10): 1049-1051.