Statistics – Applications
Scientific paper
Feb 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005spie.5634...49r&link_type=abstract
Advanced Sensor Systems and Applications II. Edited by Rao, Yun-Jiang; Kwon, Osuk Y.; Peng, Gang-Ding. Proceedings of the SPIE,
Statistics
Applications
1
Scientific paper
By using the edge-filtering approach, a low-cost strain sensor system with the long-period fiber grating (LPFG) written by high frequency CO2 laser pulses is demonstrated for the measurement of both static and dynamic strains. In this system, the wavelength-shift induced by the strain applied to the LPFG is interrogated by using a single-frequency DFB laser source. The intensity change due to the wavelength-shift is received by a photodetector. In addition, the intensity fluctuation due to instability of the fiber link is compensated by using a reference light source at 1310nm. In the static measurement, the result shows that the relationship between the electrical output of the sensor and the strain is very linear. The resolution of this sensing system is better than 10μɛ and the error is +/-10μɛ. Dynamic strain measurement over 5kHz is also demonstrated. This sensor system offers the advantages of low-cost and fast response.
Li Jing-Yi
Rao Yun-Jiang
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