![]() The merit of the CMUT derives from having a very large electric field in the cavity of the capacitor, a field of the order of 10 8 V/m or higher results in an electro-mechanical coupling coefficient that competes with the best piezoelectric materials. Transduction is achieved electrostatically, in contrast with piezoelectric transducers. A CMUT consists of a flexible top plate suspended over a gap. Later, a simple underwater experiment showed the huge advantage in bandwidth over piezoelectric transducers and motivated the development of a sealed CMUT for immersion applications. ![]() The capacitive micromachined ultrasonic transducer (CMUT) started with an idea to make a better airborne ultrasound transducer operating in the MHz frequency range.
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