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Electric field control for capacitive micromachined ultrasound transducers
Electric field control for capacitive micromachined ultrasound transducers
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机译:电容式微加工超声换能器的电场控制
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摘要
Alternating the polarity of the bias voltage in synchrony with the transmit period avoids dielectric and transformer polarization and allows the bias to be changed without generating a pressure artifact as the bias is changed. Alternating the bias polarity may also reduce the bandwidth requirements for square-law operation with low harmonic distortion, allowing more narrow band transmit excitation. Phase-inversion techniques for harmonic or other imaging may be used with a CMUT.
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