Scheme of optical fiber temperature sensor employing deep-grooved process optimization

Abstract

To optimize the optical fiber temperature sensor employing the deep-grooved process, a novel scheme was proposed. Fabricated by the promising CO₂ laser irradiation system based on the two-dimensional scanning motorized stage with high precision, the novel deep-grooved optical fiber temperature sensor was obtained with its temperature sensitivity of the transmission attenuation −0.107 dB/°C, which was 18.086 times higher than the optical fiber sensor with the normal depth of grooves while other parameters remained unchanged. The principal research and experimental testing showed that the designed temperature sensor measurement unit had the ability of high sensitivity in transmission attenuation and insensitivity to the wavelength, which offers possible applications in engineering.

Keywords

OFTS / temperature sensitivity / transmission attenuation / deep-grooved process

References

[1] Fang X, Liao C, Wang D. Femtosecond laser fabricated fiber Bragg grating in microfiber for refractive index sensing. Optics Letters, 2010, 35(7): 1007-1009.

[2] Zhang B, Kahrizi M. High-temperature resistance fiber Bragg grating temperature sensor fabrication. IEEE Sensors Journal, 2007, 7(4): 586-591.

[3] Wang Y, Jin W, Wang D. Unique temperature sensing characteristics of CO₂-laser-notched long-period fiber gratings. Optics and Lasers in Engineering, 2009, 47(10): 1044-1048.

[4] Gan W, Wang Y. Study of isolated contact temperature monitoring system based on optical wireless sensing technology. Photonic Sensors, 2014, 4(2): 108-112.

[5] Chen X, Yu Y, Xu X, Huang Q, Ou Z, Wang J, . Temperature insensitive bending sensor based on in-line Mach-Zehnder interferometer. Photonic Sensors, 2014, 4(3): 193-197.

[6] Zhu J, Zhang A P, Xia T, He S. Fiber-optic high-temperature sensor based on thin-core fiber modal interferometer. IEEE Sensors Journal, 2010, 10(9): 1415-1418.

[7] Lin C, Wang L, Chern G. Corrugated long-period fiber gratings as strain, torsion, and bending Sensors. Journal of Lightwave Technology, 2001, 19(8): 1159-1168.

[8] Lin C, Li Q, Au A A, Jiang Y, Wu E, Lee H. Strain-induced thermally tuned long-period fiber gratings fabricated on a periodically corrugated. Journal of Lightwave Technology, 2004, 22(7): 1818-1827.

[9] Wang Y, Wang D N, Jin W, Rao Y, Peng G. Asymmetric long period fiber gratings fabricated by use of CO₂ laser to carve periodic grooves on the optical fiber. Applied Physics Letters, 2006, 89(15): 151105-1-151105-3.

[10] Liu Y, Zeng L, Lu Y, Liu S, Huang Z. Intensity-modulated bending sensors based on rare-earth-doped fibers. Acta Physica Sinica, 2011, 60(10): 372-376.

[11] Yu Y, Li X, Hong X, Deng Y, Song K, Geng Y, . Some features of photonic crystal fiber temperature sensor based on liquid ethanol filling. Optics Express, 2010, 18(15): 15383-15388.

[12] Vaziri M, Chen C. Optical-fiber strain sensors with asymmetric etched structures. Applied Optics, 1993, 32(31): 6399-6406.