Measurement of Temperature and Relative Humidity with Polymer Optical Fiber Sensors Based on the Induced Stress-Optic Effect
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...
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-03-01
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| Series: | Sensors |
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| Online Access: | http://www.mdpi.com/1424-8220/18/3/916 |
| _version_ | 1818013880392089600 |
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| author | Arnaldo Leal-Junior Anselmo Frizera-Neto Carlos Marques Maria José Pontes |
| author_facet | Arnaldo Leal-Junior Anselmo Frizera-Neto Carlos Marques Maria José Pontes |
| author_sort | Arnaldo Leal-Junior |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-14T06:38:45Z |
| format | Article |
| id | doaj.art-d7818aedbd334cc7aa78308d27b5b5c9 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-14T06:38:45Z |
| publishDate | 2018-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-d7818aedbd334cc7aa78308d27b5b5c92022-12-22T02:07:24ZengMDPI AGSensors1424-82202018-03-0118391610.3390/s18030916s18030916Measurement of Temperature and Relative Humidity with Polymer Optical Fiber Sensors Based on the Induced Stress-Optic EffectArnaldo Leal-Junior0Anselmo Frizera-Neto1Carlos Marques2Maria José Pontes3Graduate Program of Electrical Engineering of Federal University of Espirito Santo, 29075-910 Vitória, BrazilGraduate Program of Electrical Engineering of Federal University of Espirito Santo, 29075-910 Vitória, BrazilInstituto de Telecomunicações, Campos Universitário de Santiago, 3810-193 Aveiro, PortugalGraduate Program of Electrical Engineering of Federal University of Espirito Santo, 29075-910 Vitória, BrazilThis 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.http://www.mdpi.com/1424-8220/18/3/916polymer optical fibertemperature sensorrelative humidity sensorstress-optic effect |
| spellingShingle | Arnaldo Leal-Junior Anselmo Frizera-Neto Carlos Marques Maria José Pontes Measurement of Temperature and Relative Humidity with Polymer Optical Fiber Sensors Based on the Induced Stress-Optic Effect Sensors polymer optical fiber temperature sensor relative humidity sensor stress-optic effect |
| title | Measurement of Temperature and Relative Humidity with Polymer Optical Fiber Sensors Based on the Induced Stress-Optic Effect |
| title_full | Measurement of Temperature and Relative Humidity with Polymer Optical Fiber Sensors Based on the Induced Stress-Optic Effect |
| title_fullStr | Measurement of Temperature and Relative Humidity with Polymer Optical Fiber Sensors Based on the Induced Stress-Optic Effect |
| title_full_unstemmed | Measurement of Temperature and Relative Humidity with Polymer Optical Fiber Sensors Based on the Induced Stress-Optic Effect |
| title_short | Measurement of Temperature and Relative Humidity with Polymer Optical Fiber Sensors Based on the Induced Stress-Optic Effect |
| title_sort | measurement of temperature and relative humidity with polymer optical fiber sensors based on the induced stress optic effect |
| topic | polymer optical fiber temperature sensor relative humidity sensor stress-optic effect |
| url | http://www.mdpi.com/1424-8220/18/3/916 |
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