This paper introduced a capacitive
micromachined ultrasound transducer based on Si-Si
bonding technology. The resonance frequency and the vibration mode were determined by theoretical
analysis and simulation, and the device was
fabricated by MEMS technology. The topography
measurement result from SEM shows that the cavity
has a high etching accuracy and the membrane thickness is of great uniformity. Besides, the
machining technology is simple and short in cycle,
which allows volume production. The frequency test
implemented by Polytec MSA-400 shows that the
resonance frequency is 932.8 kHz, which can meet
all the requirements. The designed CMUT will surely
have broad prospects in the application of longdistance
ultrasound imaging and testing.