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Abstract
To detect toxic gases, a clad modified fiber optic sensor with nanocrystalline Al2O3 is proposed. The cladding of the fiber in the gas sensing region is made of as-prepared and annealed Al2O3 (500 °C & 1200 °C) samples. The sensitivity to poisonous gases such as acetone, isopropyl alcohol, and benzene at ambient temperature is studied using the phenomenon of the evanescent wave absorption. For various gas concentrations (0-50-100––500 ppm), the spectrum characteristics of the fiber optic gas sensor are investigated. The spectral peak intensity of the sensor varies linearly with the acetone concentration. For gas selectivity, the sensor’s properties with isopropyl alcohol and benzene gases are also investigated. Acetone (1200 °C) had a higher sensitivity than isopropyl alcohol and benzene among the three gas vapors. The sensor’s time response characteristics are also presented.
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