Air-coupled ultrasonic time-of-flight measurement system using amplitude-modulated and phase inverted driving signal for accurate distance measurements

IEICE Electronics Express

Hiroyuki Tsuritani¹  Yoshitoshi Tsukamoto¹  Katsuhiro Sasaki¹  Satoshi Iwatsubo¹ 

[1] Central Research Institute, Toyama Industrial Technology Center

关键词: amplitude-modulated and phase-inverted signal;    sharp envelope;    time-of-flight;    zero-crossing time;    narrow-band transducer;    distance measurement;   

DOI  :  10.1587/elex.6.1516

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

References(7)Cited-By(2)This paper proposes an amplitude-modulated and phase-inverted (AMPI) ultrasonic driving signal for accurate distance measurements. Undesirable part of the ultrasonic wave was canceled using the phase-inverted wave and its active canceling effect was enhanced by the amplitude-modulation, so that a unique ultrasonic waveform having a sharp envelope could be generated even with a narrow-band transducer of frequency 40kHz (wavelength λ ≅ 9mm). The sharp envelope generated by the AMPI signal determined a zero-crossing time without any uncertainty. As a result, an accuracy better than 0.02mm was achieved in the range of 0.1 - 0.5m.

【 授权许可】

Unknown