Share Email Print

Optical Engineering

Accuracy and performance analysis of digital levels
Author(s): Jonas Skeivalas; V. Giniotis
Format Member Price Non-Member Price
PDF $20.00 $25.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

Optical-electronic leveling devices using a staff with bar codes are discussed. The reading of the staff is taken along its longitudinal axis; the distance to the staff and its vertical position are determined by the readings of a translational transducer connected to the optical system during its focusing on the bars of the staff. The height is determined according to coded signals of the image of the bars transferred into an array of photoelectric cells in the instrument and processed by a microprocessor to the height values. Three main types of image processing are used in various types of digital levels: a correlation method, a geometric method, and a phase method. The correlation functions of measuring and reference codes in the electronic level are calculated in this paper, showing possible errors of height determination. The information obtained during the measurement shows the relationship between the information entropy received from different values of readings from the staff. A new digital level design is proposed, simplifying the design of the instrument and the staff as well. The principal correlation and error determination equations are given, and diagrams of the new design are included.

Paper Details

Date Published: 1 February 2005
PDF: 6 pages
Opt. Eng. 44(2) 027007 doi: 10.1117/1.1844533
Published in: Optical Engineering Volume 44, Issue 2
Show Author Affiliations
Jonas Skeivalas, Vilnius Univ. (Lithuania)
V. Giniotis, Vilnius Gediminas Technical Univ. (Lithuania)

© SPIE. Terms of Use
Back to Top