| 摘要 |
<p>A method of an apparatus for measuring or determining the movement characteristics of an object uses the detection of changes in beams. A set of beams F1 - B1, F2 - B2, F3 - B3 is disposed in the movement path of the object; at relative angles to each other; and at acute angles to the intended direction of the object. The number of changes in the beams or durations between changes in the beams are recorded. The relative times, durations or differences in relative times, at which different beams of the set are changed are measured. The resulting measurements are associated with the relevant movement characteristics of the object.</p> |
