A Single Ultrasonic Transducer Fast and Robust Short-Range Distance Measurement Method
Sprache des Vortragstitels:
IEEE International Ultrasonics Symposium 2019
Sprache des Tagungstitel:
Capacitive micromachined ultrasonic transducers (CMUTs) enable the design of small and low-cost proximity sensors for application areas such as embedded systems. Precise short-range distance measurements are achieved via time-of flight (TOF) estimation based on the transmission of frequency modulated signals and pulse compression on the received echo. In single CMUT transceiver designs, the lower limit of the detection range is constrained by the transmit pulse width and membrane ringing, resulting in a blanking zone where no echo signal can be detected. This contribution describes a low complexity method based on customized transmit pulses and partial ringing removal to reduce the minimum detectable range down to 3 cm, while maintaining high precision at larger distances of up to 30 cm.