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Proceedings Paper

Development of laser-welded thin wall stainless steel pipe
Author(s): Hiroshi Asada; Shoji Inoue; Toshiro Yamada
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Paper Abstract

Curved micro-tunneling using small conduit pipes with diameters of 1m or less is recently applied in many construction sites. We have come up with a new position sensing system to pinpoint the head of the first pipe even when it cannot be seen directly from the base position. It differs from the traditional method of using the collimated laser beam, in that a diode laser with a large divergence is used as the point source of light. The direction of the point source of light is detected by using an objective lens and CCD camera. To apply this method to the position detection of the first pipe, the structure of the sensing unit and its detection accuracy were examined and the following result were obtained. (1) The structure using a polarized beam splitter can suppress error led by rotating the sensing unit. (2) Through simulation and some field test, 20 seconds or less detection accuracy of direction angle was achieved.

Paper Details

Date Published: 14 January 2000
PDF: 8 pages
Proc. SPIE 3887, High-Power Lasers in Civil Engineering and Architecture, (14 January 2000); doi: 10.1117/12.375197
Show Author Affiliations
Hiroshi Asada, Nisshin Steel Co., Ltd. (Japan)
Shoji Inoue, Nisshin Steel Co., Ltd. (Japan)
Toshiro Yamada, Nisshin Steel Co., Ltd. (Japan)

Published in SPIE Proceedings Vol. 3887:
High-Power Lasers in Civil Engineering and Architecture
Sadao Nakai; Lloyd A. Hackel; Wayne C. Solomon, Editor(s)

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