A Room Temperature Passive Wireless Hydrogen SAW Sensor
Date Issued
2009
Date
2009
Author(s)
Huang, Ya-Shan
Abstract
For an energy crisis, the clean fuel is gradually taken seriously. Hydrogen is an alternative energy source, and now hydrogen vehicles are not a reality but a product on the market. Hydrogen gas is colorless, tasteless and flammable. When concentrations of hydrogen are between 4% and 75%, hydrogen is subject to combustion and explosion risk. During the process of hydrogen gas storage and transportation, monitoring the condition of hydrogen gas is important for environmental protection and human safety. Besides, it is convenient to use a hydrogen sensor, especially the passive wireless hydrogen sensor. A passive device doesn’t need a battery, and the cost will be reduced greatly. Hence, the passive wireless hydrogen SAW sensor is developed for its convenience and low cost.n this thesis, an impedance-loaded SAW sensor is achieved by combining the SAW tag whose substrate is the 433MHz 128˚ YX-LiNbO3 and a resistive hydrogen sensor. First, the coupling-of-modes model is used to design the parameters of the SAW tag and predict the frequency response. Then, by employing the fast Fourier transform the signals in time domain can be obtained. The resistive hydrogen sensor whose sensing film is the Pt-coated ZnO nanorods has the advantages of high stability, repeatability and easy fabrication. Finally, the sensor is formed and measured to evaluate performances. The results show that this SAW sensor has good repeatability and high sensitivity, and its advantages are wireless transmission, passive mode and mini size.
Subjects
Surface acoustic wave
Wireless
Passive
Hydrogen sensor
Pt
ZnO nanorods
SDGs
Type
thesis
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