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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0940047 (1992-09-03) |
발명자 / 주소 |
|
인용정보 | 피인용 횟수 : 72 인용 특허 : 0 |
A beam system for traffic monitoring which comprises transmitters for two pairs of beams which constitute a start and a stop pair of beams which in use are spaced from each other by a known distance; receivers for each beam; electronic means connected to detect when reception of the beams by the rec
A beam system for monitoring vehicles which comprises a) a transmitter for a higher and a lower pair of beams, both beam pairs having a start beam and a stop beam, said start and said stop beams being spaced from each other by a known measuring distance, b) a receiver for each beam, c) electronic me
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