Arrangement for measuring angles

Details Arrangement for measuring angles Arrangement for measuring angles

1977-12-12

1979-03-06

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534

Patent

active

041432681

ABSTRACT:
An arrangement for measuring angles, particularly for use in theodolites employs light electric detectors to carry out physical measurements. An index mark which is used in the measuring operation is arranged together with at least one reading position of a graduated circle in the object plane of an imaging system. The latter images the reading position of the graduated circle on to a first light electric detector and the index mark on to a second light electric detector. When two reading positions are used to obtain the reading value then the first reading position is imaged on to the second reading position which, together with the index mark, lies in the object plane of the imaging system. The common arrangement of the reading position and the index mark in the object plane of the imaging system eliminates any inaccuracies of the optical components and hence, accidental measuring errors. So it is possible to do without a very complicated light electrical evaluation system.

REFERENCES:
patent: 3458709 (1969-07-01), Beall
patent: 3562772 (1971-02-01), Erbe
patent: 4064435 (1977-12-01), Stebbins

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