| 摘要 |
A motion sensor having an outer tubular member closed at both ends thereof and an inner tubular member, concentrically disposed within the outer tubular member, forming therein an inner chamber and with the outer tubular member forming an outer chamber surrounding the inner chamber, the inner tubular member being provided with one or more apertures in walls thereof allowing fluid flow between the inner and outer chambers. A liquid at least partially fills the inner and outer chambers providing a liquid interface therein. Operatively connected to at least one of the tubular members are devices for determining the position of the liquid interface of the liquid.
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