| 摘要 |
A portable speed measurement apparatus for determining and displaying speed characteristics of a body passing through a target zone includes radiant energy beam generation units disposed in a first housing, the emitted beams of radiant energy defining a target zone therebetween, and radiant energy sensing units disposed in a second housing, the radiant energy sensing units operably generating an output electrical signal upon perception of pre-determined radiant energy characteristics. The first and second housings are configured and are sufficiently portable so that detection and speed measurement of a body moving through the target zone may be accomplished in any desired plane.
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