PHOTOPROFILING AT DINORWIG POWER STATION.

被引：0

作者：

Waite, I.

Wendt, C.M.

机构：

来源：

| 1978年 / 42卷 / 02期

关键词：

PHOTOGRAPHY - TUNNELS AND TUNNELING - Construction;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The principle of photographing a thin band of light reflected from tunnel walls has been adapted for the project used for accurate determination of the cross-sections of hard-rock tunnel drives. A target board was designed and built consisting of two 600 multiplied by 800 mm sheets of plywood with a 6 mm gap between them; and sandwiched inside, a 1 kJ flash ring. As the ring is inside the board, a constricted band of light with reduced divergence is given out. The board is mounted on a quickset-level tripod, thus enabling the light strip to be set up in the desired position and plane. The basic equipment consists of a theodolite-mounted terrestrial camera and the target board.

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