Automatic Angle Measurement in the Aga 700 Geodimeter–Principles and Accuracies

ISSN： 1752-2706

Source： Survey Review, Vol.23, Iss.180, 1976-04, pp. : 249-270

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Abstract

The AGA company claims that the Geodimeter 700 will measure angles automatically to 5 cc (2 seconds) of arc in the horizontal plane and to 25 cc (10 seconds) in the vertical. These very high resolutions are made possible through the use of modern photolithographic processes in conjunction with the well-established moiré fringe effect. Basically the system consists of optical/electrical transducers which receive the moiré fringe patterns and convert them into electronic wave form. Counting and interpolation of these waves is then followed by digitization into either sexagesimal or centesimal degrees, minutes and seconds, which are finally displayed on the neon readout. (The Geodat attachment will punch the data on paper or plastic tape if desired.)