In this paper, we propose a temperature/thermal sensor that contains a Rhodamine-B\nsensing membrane. We applied two different sensing methods, namely, fiber-optic pulse width\nmodulation (PWM) and an interdigitated capacitor (IDC)-based temperature sensor to measure\nthe temperature from 5 Ã?ÂC to 100 Ã?ÂC. To the best of our knowledge, the fiber-optic PWM-based\ntemperature sensor is reported for the first time in this study. The proposed fiber-optic PWM\ntemperature sensor has good sensing ability; its sensitivity is ~3.733 mV/Ã?ÂC. The designed\ntemperature-sensing system offers stable sensing responses over a wide dynamic range, good\nreproducibility properties with a relative standard deviation (RSD) of ~0.021, and the capacity\nfor a linear sensing response with a correlation coefficient of R2 ? 0.992 over a wide sensing range. In\nour study, we also developed an IDC temperature sensor that is based on the capacitance variation\nprinciple as the IDC sensing element is heated. We compared the performance of the proposed\ntemperature-sensing systems with different fiber-optic temperature sensors (which are based on\nthe fiber-optic wavelength shift method, the long grating fiber-optic Sagnac loop, and probe type\nfiber-optics) in terms of sensitivity, dynamic range, and linearity. We observed that the proposed\nsensing systems have better sensing performance than the above-mentioned sensing system.
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