Abstract
Due to oxygen being one of the indispensable and most active gases in nature, the detection technology of oxygen-related physical quantities (concentration, humidity, temperature) is a necessary research content in gas sensing. Meanwhile, fiber optic sensors have been widely used in gas detection due to their small size and high-performance advantages. However, designing a highly accurate, cross-sensitive, discriminative method for detecting multiple oxygen parameters is challenging. In this study, a technique based on fiber Bragg grating (FBG) string for simultaneous identification and detection of oxygen multiple parameters is proposed. This method combines three FBGs in series for fusion and cladding design. Not only does it solve the interference of temperature on FBG, but it also achieves accurate simultaneous detection of three parameters. The experimental results indicate that the oxygen concentration sensitivity is 0.714 pm/ppm in the 300 ppm to 1800 ppm range. Within the 25 % to 75 % range, the air humidity sensitivity is 31.4 pm/RH. It is simultaneously equipped with temperature detection capability, with a 10.1 pm/°C sensitivity. The relative detection error in 20 experimental data sets does not exceed 0.45 %. Meanwhile, the sensor has excellent reproducibility and durability and can be widely applied in oxygen detection.
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