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Updated: Oct 20, 2025

Nanostructured Ag-zeolite Composites as Luminescence-based Humidity Sensors
Published on: November 15, 2016
Fluorescent lamp tungsten filament thermionic emission gun as a novel humidity optical sensor
Hossein Torabi-Monfared1, Leila Sherafat1, Mohammad Mahdi Doroodmand2
1Department of Chemistry, College of Sciences, Shiraz University, Shiraz, Iran.
Abstract:
Detecting humidity have been remained a continuing concern within some important areas such as structural health, food processing, industrial as well as agricultural products. In this study, a novel humidity optical sensor is introduced based on the thermionic emission of tungsten filament using the fluorescent lamp set-up. Estimated blue compliant using a charged coupling device camera in optical image of the tungsten filament was confirmed as an appropriate detection system for relative humidity (RH) sensing. The fabricated optical sensor has wide linear range (2.0-98% RH), improved detection limit (< 5.0% RH), acceptable saturated limit (> 99.0% RH), improved percentage of relative standard deviation (4.18%, n = 2), adequate hysteresis (< 4.0% RH) and a shorter rise time (< 5.0 s), respectively. The mechanism behind this detection system is based on the interaction between H2O and tungsten filament during formation of W[Formula: see text].x [Formula: see text]O (x = 1-2) in terms of some spectroscopic obtained evidences as well as Fourier transform infrared and X-ray diffraction spectrometries.
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