System Software Testing of Laser Tracker Leica AT401

Dvořáček, Filip

doi:10.14311/gi.13.6

Cited by 4 publications

(5 citation statements)

References 3 publications

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“…The Leica Absolute Tracker AT401 [ 22 ] is primarily designed for very precise engineering measurements. The accuracy of the angular measurement is characterized by the standard deviation σ φ = 0.15 mgon (resolution 0.02 mgon).…”

Section: Methodsmentioning

confidence: 99%

Suppression of Systematic Errors of Electronic Distance Meters for Measurement of Short Distances

Braun¹,

Štroner²,

Urban³

et al. 2015

Sensors

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In modern industrial geodesy, high demands are placed on the final accuracy, with expectations currently falling below 1 mm. The measurement methodology and surveying instruments used have to be adjusted to meet these stringent requirements, especially the total stations as the most often used instruments. A standard deviation of the measured distance is the accuracy parameter, commonly between 1 and 2 mm. This parameter is often discussed in conjunction with the determination of the real accuracy of measurements at very short distances (5–50 m) because it is generally known that this accuracy cannot be increased by simply repeating the measurement because a considerable part of the error is systematic. This article describes the detailed testing of electronic distance meters to determine the absolute size of their systematic errors, their stability over time, their repeatability and the real accuracy of their distance measurement. Twenty instruments (total stations) have been tested, and more than 60,000 distances in total were measured to determine the accuracy and precision parameters of the distance meters. Based on the experiments’ results, calibration procedures were designed, including a special correction function for each instrument, whose usage reduces the standard deviation of the measurement of distance by at least 50%.

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Section: Methodsmentioning

confidence: 99%

Suppression of Systematic Errors of Electronic Distance Meters for Measurement of Short Distances

Braun¹,

Štroner²,

Urban³

et al. 2015

Sensors

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“…Errors were discovered in the v. 2.0.0.5053 system software, and have even proved to be present in later versions [5]. No information concerning reported errors in firmware's descriptions has been observed.…”

Section: System Software (Firmware) Errorsmentioning

confidence: 99%

Laboratory Testing of Leica At401 Laser Tracker

Dvořáček

2016

Acta Polytech

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Abstract. This paper describes laboratory tests on a Leica AT401laser tracker. As the newer Leica AT402 model also uses the same firmware package, most of the results should also be valid for this device. First, we present the instrument's firmware errors and the software used for testing. The ASME B89.4.19-2006 standard for testing laser trackers is briefly presented. The warm-up effect of the instrument is inspected with respect to both angle measurement and distance measurement. The absolute distance meter (ADM) is compared with a laboratory interferometer on a 30-meter long rail and also on a bench with automated movement of the carriage of the reflector. A time series of measurements for determining the additive constant is evaluated. A simple test of the stability of the distance measurement in field conditions is introduced. Most of the tests were carried out at the Research Institute of Geodesy, Topography and Cartography (RIGTC) and at the Faculty of Civil Engineering (FCE) of the Czech Technical University in Prague (CTU).

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“…ATControl is a graphical application programmed in Matworks Matlab which enables complete raw data saving and adds many convenient functions for surveyors and metrologists. Furthermore, it enables to eliminate several important firmware errors of Leica AT40x trackers including the error wavelength and the late update of the refractive index of air [4]. However, to achieve the highest possible accuracy, the group refractive index of air was fixed during all tests held in laboratory conditions.…”

Section: Laser Tracker Leica At401mentioning

confidence: 99%

Precision Tests of Geodetic Centring Equipment

Dvořáček

2016

Geoinformatics FCE CTU

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The paper introduces testing procedures of several different geodetic centring devices performed mostly at the laboratory of the Research Institute of Geodesy, Topography and Cartography. Functional construction characteristics of a spherically mounted retroreflector Leica RRR 1.5’’, rotatable carriers Sokkia AP41 and Leica GZR3 and 12 different geodetic tribraches were examined. Further, a centring displacement instrument developed at the Czech Technical University in Prague, Faculty of Civil Engineering, Department of Special Geodesy, is evaluated in both laboratory and field conditions. For all tests, laser tracker Leica AT401 with a 5 μm standard uncertainty of absolute distance measurement, was employed.

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System Software Testing of Laser Tracker Leica AT401

Abstract: The

Cited by 4 publications

References 3 publications

Suppression of Systematic Errors of Electronic Distance Meters for Measurement of Short Distances

Suppression of Systematic Errors of Electronic Distance Meters for Measurement of Short Distances

Laboratory Testing of Leica At401 Laser Tracker

Precision Tests of Geodetic Centring Equipment

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