| 摘要 |
PCT No. PCT/JP94/00429 Sec. 371 Date Jul. 3, 1996 Sec. 102(e) Date Jul. 30, 1996 PCT Filed Mar. 17, 1994 PCT Pub. No. WO95/21367 PCT Pub. Date Aug. 10, 1995An inspection apparatus is disclosed which is adapted to accurately detect an irradiated position on a target board which is irradiated with a beam, to thereby inspect deformation of a pipe such as a sewer or the like. A laser beam emitting unit (3) is arranged on one end side of a sewer (1). The laser beam emitting unit (3) is so adjusted that a laser beam (15) is impinged on a target board (11) of a target vehicle (9) traveling from the other end side of the pipe toward the laser beam emitting unit (3). The target board (11) is provided thereon with a plurality of phototransistors (13), whereby the irradiated position is detected depending on electric signals generated by the phototransistors.
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