Abstract
In this paper, the application of a microsphere-based fiber-optic sensor with a 200 nm zinc oxide (ZnO) coating, deposited by the Atomic Layer Deposition (ALD) method, for temperature measurements between 100 and 300 °C, is presented. The main advantage of integrating a fiber-optic microsphere with a sensing device is the possibility of monitoring the integrity of the sensor head in real-time, which allows for higher accuracy during measurements. The study has demonstrated that ZnO ALD-coated microsphere-based sensors can be successfully used for temperature measurements. The sensitivity of the tested device was found to be 103.5 nW/°C when the sensor was coupled with a light source of 1300 nm central wavelength. The measured coefficient R2 of the sensor head was over 0.99, indicating a good fit of the theoretical linear model to the measured experimental data.
Highlights
Temperature is one of the most important parameters, measured in many different fields, such as science, medicine or industry [1,2,3,4,5]
The results presented were obtained according to the procedures described in Several series of measurements were carried out in order to test the device temperature sensing abilities
The sensor head was placed inside the temperature calibrator, while the range was increased with 10 ◦ C steps, between 100 and 300 ◦ C
Summary
Temperature is one of the most important parameters, measured in many different fields, such as science, medicine or industry [1,2,3,4,5]. One of the fields, where the temperature is strictly controlled is the food industry This is to ensure that the proper standards are preserved and to minimize the risks, such as bacteria growth and formation of toxins, while processing and storing the food [8,9]. Maintaining the right temperature helps to avoid food poisoning or its spoiling [10,11]. Another area, where those measurements are highly utilized are electrochemical batteries and energy storage cells, where temperature control is used to monitor device performance and stability during charging cycles, preserving its properties for as long as possible and estimating its lifetime [12,13]. Monitoring temperature is useful during plastic or metal production to ensure the quality of the products and workplace security [14,15,16]
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