Model ID: 2129
SAW Gas Sensor
A surface acoustic wave (SAW) is an acoustic wave propagating along the surface of a solid material. Its amplitude decays rapidly, often exponentially, through the depth of the material.
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More services...SAWs are utilized in many kinds of electronic components, including filters, oscillators, and sensors. SAW devices typically apply electrodes to a piezoelectric material to convert an electric signal into a SAW, and then back again. The SAW response provides the information that the device is used to collect.
This model investigates the resonance frequencies of a SAW gas sensor. The sensor consists of an interdigitated transducer etched onto a piezoelectric substrate, covered with a thin film. The mass of the film increases as its material selectively adsorbs a chemical substance from the air. This causes a shift in resonance to a slightly lower frequency and thus information about the amount of species in the air.
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Close up plot of the total displacement. |
