Central Wavelength Interrogation Method of Ultra-Short FBG by Dual-Wavelength Laser

Kai, 李凯 Li; Jingtao, 辛璟焘 Xin; Fei, 骆飞 Luo; Xiaoping, 娄小平 Lou; Lianqing, 祝连庆 Zhu

doi:10.3788/lop55.030602

Cited by 1 publication

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“…Fiber Bragg grating (FBG) sensors have been widely used for rapid temperature detection due to their unique advantages of the high sensitivity, electromagnetic immunity, and suitability for embedment. But the fabrication of the FBG requires the complex and expensive equipment, and the sensing length is quite long, typically up to 10 mm, which leads to the relatively low spatial resolution [12], limiting their practical applications [13][14][15]. Optic-fiber Fabry-Perot interferometer (FPI) sensors can overcome these shortcomings, which can be fabricated with a very short length to provide better spatial resolution and can also be used to measure temperatures with short response time [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Fast-Response Fiber-Optic FPI Temperature Sensing System Based on Modulated Grating Y-Branch Tunable Laser

Cheung,

Jing,

Liu

et al. 2023

Photonic Sens

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In this paper, a cost-effective and miniaturized instrument is proposed, which is based on a tunable modulated grating Y-branch (MG-Y) laser for rapid temperature measurement using a Fabry-Perot interferometer (FPI) sensor. The FPI sensor with a 1 463-µm cavity length is a short segment of a capillary tube sandwiched by two sections of single-mode fibers (SMFs). This system has a broad tunable range (1 527 nm–1 567 nm) with a wavelength interval of 8 pm and a tuning rate of 100 Hz. Temperature sensing experiments are carried out to investigate the performance of the system by demodulating the absolute cavity length of the FPI sensor using a cross-correlation algorithm. Experimental results show that the sensor can reach the response time as short as 94 ms with the sensitivity of 802 pm/°C. Benefiting from the homemade and integrated essential electrical circuits, the entire system has the small size, low cost, and practical application potential to be used in the harsh environment for rapid temperature measurement.

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