A tilted long-period grating imprinted on a commercial plastic optical fiber for liquid level sensing

Haiyang Bao; Peng Xue; Bingcheng Wu; Jie Zheng

doi:10.1117/12.2572795

10 October 2020 A tilted long-period grating imprinted on a commercial plastic optical fiber for liquid level sensing

Haiyang Bao, Peng Xue, Bingcheng Wu, Jie Zheng

Proceedings Volume 11554, Advanced Sensor Systems and Applications X; 115540J (2020) https://doi.org/10.1117/12.2572795
Event: SPIE/COS Photonics Asia, 2020, Online Only

Abstract

In this paper, a corrugated surface tilted long period grating (LPG) is proposed for liquid-level sensing. The tilted LPGs are fabricated on commercial plastic optical fiber (POF) by a simple mechanical die-press-print method. The liquid-level sensing performances of the so-obtained non-tilted LPGs (with the tilted angle of 0°) and the tilted LPGs (with the tilted angle of 10-30°) are investigated, respectively. The results show that the tilted LPG exhibits a better sensing performance than that of the non-tilted LPG. When the LPG period is 300μm, the groove depth is 155μm, and the tilted angle is 20°, the highest sensitivity of 0.417dB/mm is obtained by measuring the liquid-level with the refractive index (RI) of 1.33. In addition, the influence of RI on the liquid-level sensing performance of the sensor is also studied. The results show that the sensitivity of sensor is increased as the RI of liquid increased from 1.33-1.43, and the highest sensitivity can reach to 0.454dB/mm when the RI of liquid is 1.43. The proposed sensor is a low-cost solution for liquid-level measurement and with the features of easy fabrication, high sensitivity, and continuous measurement.

Conference Presentation

Citation Download Citation

Haiyang Bao, Peng Xue, Bingcheng Wu, and Jie Zheng "A tilted long-period grating imprinted on a commercial plastic optical fiber for liquid level sensing", Proc. SPIE 11554, Advanced Sensor Systems and Applications X, 115540J (10 October 2020); https://doi.org/10.1117/12.2572795

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