Abstract:The low-frequency sensitivity of piezoelectric receivers usually is assumed to be represented accurately by the −3-dB cutoff frequency fco=(2πRiCi)−1, where Ri is the loading (e.g., amplifier) resistance and Ci is the total capacitance. For typical needle-type hydrophones such as used in medical ultrasound exposimetry, fco is less than 50 kHz. However, theoretical studies have shown that diffraction effects at the needle tip can cause a low-frequency rolloff in sensitivity at frequencies much higher than that … Show more
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