| 摘要 |
A position determining system in which a delay element has at least one driver transducer at at least one position and at least one receiver transducer at at least one other position, the transducers being arranged so that a traveling wave signal at the driver transducer travels along the delay element from the first said at least one position to said at least one other position so that a distance which is to be measured is traversed more than once. Certain embodiments accomplish such operation by providing a "folded" or U-shaped delay element, the driver and receiver being located on separate legs thereof so that the traveling wave traverses both legs of the delay element so that the distance which is to be measured is traversed twice, thereby increasing the resolution of the overall device. In another embodiment, for example, a pulse is triggered a plurality of times at at least one driver transducer means so that it traverses the distance from the at least one driver transducer means to at least one receiver transducer means a plurality of times.
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