SAW gas sensor applying dispersion interdigital transducer
A technology of interdigital transducers and gas sensors, which is applied in the direction of analyzing fluids using sound waves/ultrasonic waves/infrasonic waves, and can solve problems such as poor stability, frequency jumps, and oscillator stop vibrations
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[0027] 1. Designed to receive IDTs. For example, the number of interdigital pairs of receiving interdigital transducers is 30 pairs, and the electrode width and electrode interval are equal to 2.4 μm. When the piezoelectric film is made of AlN piezoelectric material, the phase velocity of SAW is about 5280m / s. The width of an electrode plus the width of the interval between two electrodes is used as a SAW wavelength λ, such as figure 1 As shown, the center frequency f0=550MHz of the receiving interdigital transducer can be calculated, and its bandwidth is 18.3MHz.
[0028] 2. Design the middle reflection grid. The width of the metal strips of the middle reflection grid is equal to the width of the interval between the metal strips. The width of the two metal strips plus the width of the two intervals is used as a SAW wavelength λ, such as figure 1 As shown, the total length of the intermediate reflection grid is 100-150 SAW wavelengths, that is, the number of metal strips is ...
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