Abstract
In this paper, we propose a temperature/thermal sensor that contains a Rhodamine-B sensing membrane. We applied two different sensing methods, namely, fiber-optic pulse width modulation (PWM) and an interdigitated capacitor (IDC)-based temperature sensor to measure the temperature from 5 °C to 100 °C. To the best of our knowledge, the fiber-optic PWM-based temperature sensor is reported for the first time in this study. The proposed fiber-optic PWM temperature sensor has good sensing ability; its sensitivity is ~3.733 mV/°C. The designed temperature-sensing system offers stable sensing responses over a wide dynamic range, good reproducibility properties with a relative standard deviation (RSD) of ~0.021, and the capacity for a linear sensing response with a correlation coefficient of R2 ≈ 0.992 over a wide sensing range. In our study, we also developed an IDC temperature sensor that is based on the capacitance variation principle as the IDC sensing element is heated. We compared the performance of the proposed temperature-sensing systems with different fiber-optic temperature sensors (which are based on the fiber-optic wavelength shift method, the long grating fiber-optic Sagnac loop, and probe type fiber-optics) in terms of sensitivity, dynamic range, and linearity. We observed that the proposed sensing systems have better sensing performance than the above-mentioned sensing system.
Highlights
Temperature sensors are useful devices in many areas of our lives
We proposed a side-polished fiber-optic temperature sensor that is based on the principle of fiber-optic pulse width modulation (PWM) [40,41,42] technique
The pulse width is proportional to the heat absorbed by the thermochromic-compound-based polymer waveguide, which corresponds to the absorption of the evanescent field into the wave guide
Summary
Temperature sensors are useful (even essential) devices in many areas of our lives. They are primarily used to measure and monitor the temperature driven by several environmental conditions. The operation principle of the sensor is based on optical Fabry-Perot interference and the bimetallic diaphragm effect Their proposed temperature sensor has some advantages, it has several disadvantages such as a complex fabrication procedure and a low dynamic range of 20–70 ̋ C. The temperature sensor offers good sensitivity and linearity, it has some disadvantages for example low dynamic range (26 ̋ C to 40 ̋ C) and difficulty of obtaining the resonance wavelength. The proposed temperature sensors have many advantages including low-cost, compactness, ease of fabrication, high sensitivity, highly stable response performance, wide dynamic range, fast response and recovery times, and ease of manufacture Offer we applied two different sensingthan principles proposed better sensing performance others.(i.e., fiber-optic PWM and capacitance variation) to prepare different types of temperature sensor to measure the temperature from
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