发明名称 |
Systems and processing algorithms for ultrasound time-of-flight digitizer systems |
摘要 |
A method and corresponding system for tracking variations in distance D calculated from time-of-flight measurements of a sequence of pulses of a pressure wave oscillation from a transmitter to a receiver identifies a state of synchronous operation by obtaining at least two time-of-flight measurements derived from successive pressure wave pulse which satisfy given synchronicity criteria. Successive time-of-flight measurements are then monitored to identify a shifted time-of-flight measurement which varies by at least half of the wave period from a predicted time-of-flight value calculated from a number of preceding time-of-flight measurements. A shift factor is then identified corresponding to an integer multiple of the wave period by which the shifted time-of-flight measurement must be corrected to obtain a corrected time-of-flight measurement falling within half of the wave period from the predicted time-of-flight value. The distance D calculated from the shifted time-of-flight measurement is then corrected by the product of the shift factor and the pressure wave wavelength.
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申请公布号 |
US6265676(B1) |
申请公布日期 |
2001.07.24 |
申请号 |
US19980150251 |
申请日期 |
1998.09.10 |
申请人 |
ELECTRONICS FOR IMAGING, INC. |
发明人 |
ZLOTER ZAHI;SHENHOLZ GIDEON;SERBER RON |
分类号 |
G01S7/52;G01S7/526;G01S11/14;G01S15/10;G01S15/87;G06F3/033;G06F3/043;(IPC1-7):G08C21/00 |
主分类号 |
G01S7/52 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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