Journal
OPTICAL FIBER TECHNOLOGY
Volume 45, Issue -, Pages 359-362Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.yofte.2018.08.017
Keywords
Optical fiber temperature sensor; TiO2 thin film; Smartphone
Funding
- National Natural Science Foundation of China (NSFC) [51775283, 51405240]
- National Natural Science Foundation of Jiangsu Province [BK20161559, BK20161562]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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A novel TiO2 thin film temperature sensor monitored by smartphone is proposed and demonstrated. The sensing head is constructed by titanium dioxide thin film deposited on the polished quartz fiber tip. A smartphone and a diffraction grating are employed as interrogation system. Fiber with 45 degrees polished tip connect the flashlight and the camera on the smartphone, and the diffraction grating spreads the transmission spectrum over the camera's pixels, allowing for repeatable measurements of shifts of the spectrum. Using this method, the reflection intensity of sensor can be measured by smartphone and then the surrounding temperature is monitored by the shift of the reflection spectrum. The experimental results show that the sensor exhibits a good linearity over a temperature range of -10 degrees C to 180 degrees C with the sensitivity of 0.4 6 pixel/degrees C. Consequently, the interrogation method can provide a low-cost, integrated and intelligent measurement platform for thin film fiber temperature sensor.
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