发明名称 |
ACCELEROMETERS |
摘要 |
<p>A method for closed loop operation of a capacitive accelerometer comprising: a proof mass; first and second sets of both fixed and moveable capacitive electrode fingers, interdigitated with each other; the method comprising: applying PWM drive signals to the fixed fingers; sensing displacement of the proof mass and changing the mark:space ratio of the PWM drive signals, to provide a restoring force on the proof mass that balances the inertial force of the applied acceleration and maintains the proof mass at a null position; detecting when the mark:space ratio for the null position is beyond a predetermined upper or lower threshold; and further modulating the PWM drive signals by extending or reducing x pulses in every y cycles, where x>l and y>l, to provide an average mark:space ratio beyond the upper or lower threshold without further increasing or decreasing the mark length of the other pulses.</p> |
申请公布号 |
WO2015140537(A1) |
申请公布日期 |
2015.09.24 |
申请号 |
WO2015GB50778 |
申请日期 |
2015.03.17 |
申请人 |
ATLANTIC INERTIAL SYSTEMS LIMITED |
发明人 |
TOWNSEND, KEVIN;DURSTON, MICHAEL TERRENCE |
分类号 |
G01P15/125;G01P15/08;G01P15/13;G01P21/00 |
主分类号 |
G01P15/125 |
代理机构 |
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代理人 |
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地址 |
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