Device for the automatic measurement of tunnel sections

Details Device for the automatic measurement of tunnel sections Device for the automatic measurement of tunnel sections

1974-08-30

1976-04-13

Wilbur, Maynard R.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356141, 340 61, 356 4, G01C 300, G01C 308

Patent

active

039500969

ABSTRACT:
This invention relates to a device for the automatic measurement of tunnel sections with a gas-laser and optical means, comprising further an image analyzer which comprises a rotatable disc, an opto-electronic group with light sources, photocells, a photomultiplier and a counter, said image analyzer indicating a value which is proportional to the distance between the tunnel axis and the impact point of the laser beam on the tunnel wall.

REFERENCES:
patent: 2468042 (1949-04-01), Cranberg
patent: 2783450 (1957-02-01), Jackson
patent: 3147384 (1964-09-01), Fenton et al.
patent: 3705772 (1972-12-01), Andreas

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