How is quality factor calculated?
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hello
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the q factor of the pmut can be determined by the real part of the impedance frequency spectrum, which is defined as q = fr/δf, where the resonance frequency fr is the frequency at which the real part of the impedance reaches its maximum, δf is the width of the peak at its half height, so-called 3 db bandwidth. figure 24.24 shows the real part of the impedance frequency spectrum of the pmut as shown in fig. 24.23. the measurement data was fitted using the lorentz function. the fitted parameters fr and δf were used to estimate the q value. the estimated q value is about 110.
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