Surveying target with high intensity discharge lamp

Details Surveying target with high intensity discharge lamp Surveying target with high intensity discharge lamp

1987-06-23

1989-09-19

Cuchlinski, Jr., William A.

Geometrical instruments

Straight-line light ray type

Rod or target

362109, G01C 1506

Patent

active

048668494

ABSTRACT:
A surveying target having a housing with one open side, encloses a high intensity gas discharge flash tube. A light absorbing surface in the housing bounding the back and sides of said flash tube prevents reflection of light, thereby maintaining a relatively discrete outline. A light transparent cover member on said open side for passing light from said high intensity gas discharge tube toward an observer. A transmitter and receiver, and including resettable code devices are provided for limiting responsive operation only to transmitters transmitting a preassigned code and a corresponding receiver for detecting said preassigned code. A light transparent cover member filters light from said lamp of a predetermined wave length. A surveying system using an optical instrument for binocular visioned observers is also disclosed.

REFERENCES:
patent: 2488541 (1949-11-01), Holme
patent: 2969594 (1961-01-01), Palmer
patent: 3678590 (1972-07-01), Hayward
patent: 3790277 (1974-02-01), Hogan
patent: 3857639 (1974-12-01), Mason
patent: 4470675 (1984-09-01), DiGianfilippo et al.
patent: 4494870 (1985-01-01), Hentschel et al.

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