Measurement of Temperature and Relative Humidity with Polymer Optical Fiber Sensors Based on the Induced Stress-Optic Effect
Year: 2018
Type: article
Abstract: This paper presents a system capable of measuring temperature and relative humidity with polymer optical fiber (POF) sensors. The sensors are based on variations of the Young's and shear moduli of the POF with variations in temperature and relative humidity. The system comprises two POFs, each with a predefined torsion stress that resulted in a variation in the fiber refractive index due to the stress-optic effect. Because there is a correlation between stress and material properties, the variation in temperature and humidity causes a variation in the fiber's stress, which leads to variations in the fiber refractive index. Only two photodiodes comprise the sensor interrogation, resulting in a simple and low-cost system capable of measuring humidity in the range of 5-97% and temperature in the range of 21-46 °C. The root mean squared errors (RMSEs) between the proposed sensors and the reference were 1.12 °C and 1.36% for the measurements of temperature and relative humidity, respectively. In addition, fiber etching resulted in a sensor with a 2 s response time for a relative humidity variation of 10%, which is one of the lowest recorded response times for intrinsic POF humidity sensors.
Source: Sensors
DOI: 10.3390/s18030916
Language: English
Topic: Advanced Fiber Optic Sensors
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $3,137
Funders: Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Ministério da Educação e Ciência, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Fundação de Amparo à Pesquisa e Inovação do Espírito Santo, Ministério da Educação, Fundação para a Ciência e a Tecnologia, European Regional Development Fund
Awards: G1142871124, G1383977967, G1418007952, G1574542946, G2202514700, G2297229173, G2359468071, G2673245850, G267965309, G271072166, G2823776494, G2855329553, G2885677095, G3079904149, G3850789590, G3881075001, G3959771991, Instituto de Telecomunicações, G5064425784, G517425411, G5258074927, G547185811, G5478454439, G5505475780, G5792089071, G5816084688, G6008321814, G6416105506, G7036833726, G7284187601, G7334081085, G73928385, Optical fiber sensors for applications in harsh and highly flammable environments, G7696339486, G7763239512, G7812667954, G8035700175, G929281750
OpenAlex ID: W2789462357