Optical fiber fluorescent temperature sensor based on capillary glass tube encapsulation

Jianwei Huang; Ting Liu

doi:10.1117/12.2626399

20 January 2022 Optical fiber fluorescent temperature sensor based on capillary glass tube encapsulation

Jianwei Huang, Ting Liu

Proceedings Volume 12154, 13th International Photonics and OptoElectronics Meetings (POEM 2021); 1215408 (2022) https://doi.org/10.1117/12.2626399
Event: 13th International Photonics and OptoElectronics Meetings (POEM 2021), 2021, Wuhan, China

Abstract

As an important physical quantity, the temperature detection is necessary. Based on the demand for temperature detection in harsh environment, the optical fiber fluorescent temperature sensor has been developed. Most of the sensing probes were prepared by doping fluorescence substance into optical fiber or modifying them onto the optical fiber surfaces. However, the former requires expensive equipment, while the latter suffers from instability. Here, we propose a method of encapsulating the temperature-sensitive material of rhodamine B (RhB) in a capillary glass tube to prepare the sensing probe which only relies on extremely simple fabrication operation and cost-effective materials. The sensing probe is connected with the fiber-coupled laser and smartphone through a 2x1 fiber coupler, which are respectively used to excite and collect the fluorescent signal of RhB. The optimization of the capillary tube length, the tube wall thickness, and the immersion depth of light fiber show that these parameters have little influence on the performance of the sensor. By placing the sensing probe in the water bath, the temperature ranging from 30 °C to 70 °C. The sensor is proven to good sensitivity, stability and reusability.

Citation Download Citation

Jianwei Huang and Ting Liu "Optical fiber fluorescent temperature sensor based on capillary glass tube encapsulation", Proc. SPIE 12154, 13th International Photonics and OptoElectronics Meetings (POEM 2021), 1215408 (20 January 2022); https://doi.org/10.1117/12.2626399

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KEYWORDS

Luminescence

Optical fibers

Temperature sensors

Sensors

Temperature metrology

Capillaries

Rhodamine B

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