| 摘要 |
PROBLEM TO BE SOLVED: To provide an obstacle detecting device in which a mounting expenditure for a leakage transmission path or its maintenance expenditure is reduced by about 3/4 when the detecting device covers a detecting range of wide spacing in obstacles. SOLUTION: This detecting device comprises a transmittance side leakage cable 1, and a pair of receiving side transmittance paths 2a, 2b around the transmittance side leakage cable 1 and arranged at both sides in parallel with it; a transmittance part 4 arranged at the transmittance side leakage transmittance path end so as to transmit an electric wave dispersed in spectrum with a pseudo noise code; receiving portions 5a, 5b arranged at each of the pair of receiving side leakage transmittance path ends so as to receive delayed electric wave in response to a position on the receiving side leakage transmittance path; a delay time measuring part for detecting an obstacle, specifying its position and measuring its moving speed in response to the delay time of the received electric wave and a variation in time of an electrical power level; and a receiving level comparing part 3. COPYRIGHT: (C)2004,JPO
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