A robust doppler ultrasonic 3D imaging system with MEMS microphone array and configurable processor
Ultrasonics Symposium(2011)
摘要
In ultrasonic imaging, the Doppler effect, which is caused by the movement of the target, causes a frequency shift on the reflected sound, and results in object detection failure. We have constructed an experimental system for ultrasonic imaging. By utilizing a log-step multicarrier signal as the transmitter wave, we succeeded in obtaining 3D imaging of a moving object. The system comprises of a number of MEMS sensors and an FPGA configured to capture signals from the sensors and store them in the memory device for sufficient duration. We show the imaging results using a log-step multicarrier signal as well as using a traditional log-swept chirp signal and a linear-step multicarrier signal. The results exemplify the possibility of Doppler 3D imaging using the system, and the validity of log-step multicarrier signals.
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关键词
doppler effect,acoustic signal processing,microphone arrays,microsensors,ultrasonic imaging,ultrasonic reflection,ultrasonic transmission,mems microphone array,mems sensors,frequency shift,linear-step multicarrier signal,log-step multicarrier signal,log-swept chirp signal,robust doppler ultrasonic 3d imaging system,sound,reflection,transmitter wave,field programmable gate arrays,sensors,image sensors
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