LABORATORY TESTING OF LEICA AT401 LASER TRACKER

<p>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).</p>

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The development of laser tracker capable of absolute distance measurement

The Proceedings of The Manufacturing & Machine Tool Conference ◽

10.1299/jsmemmt.2018.12.b24 ◽

2018 ◽

Vol 2018.12 (0) ◽

pp. B24

Author(s):

Makoto Yokei ◽

Winarno Agustinus ◽

Masaki Michihata ◽

Satoru Takahashi ◽

Kiyoshi Takamasu

Keyword(s):

Distance Measurement ◽

Laser Tracker ◽

Absolute Distance

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Precision Tests of Geodetic Centring Equipment

Geoinformatics FCE CTU ◽

10.14311/gi.15.2.1 ◽

2016 ◽

Vol 15 (2) ◽

pp. 5-14

Author(s):

Filip Dvořáček

Keyword(s):

Civil Engineering ◽

Standard Uncertainty ◽

Distance Measurement ◽

Field Conditions ◽

Laser Tracker ◽

Absolute Distance ◽

Testing Procedures ◽

Engineering Department ◽

Technical University ◽

Research Institute

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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Absolute distance measurement interferometry for alignment systems for advanced lithography tools

Journal of Vacuum Science & Technology B Microelectronics Processing and Phenomena ◽

10.1116/1.588623 ◽

1996 ◽

Vol 14 (6) ◽

pp. 3960 ◽

Cited By ~ 4

Author(s):

Thomas J. Dunn

Keyword(s):

Distance Measurement ◽

Absolute Distance

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Delayed Trilateral Teleoperation of a Mobile Robot

Mathematical Problems in Engineering ◽

10.1155/2017/6048365 ◽

2017 ◽

Vol 2017 ◽

pp. 1-12 ◽

Cited By ~ 2

Author(s):

D. Santiago ◽

E. Slawiñski ◽

V. Mut

Keyword(s):

Stability Analysis ◽

Mobile Robot ◽

Shared Environment ◽

Time Varying ◽

Control Parameters ◽

Simple Test ◽

Control Loop ◽

Teleoperation System ◽

Human Operators ◽

The Stability

This paper analyzes the stability of a trilateral teleoperation system of a mobile robot. This type of system is nonlinear, time-varying, and delayed and includes a master-slave kinematic dissimilarity. To close the control loop, three P+d controllers are used under a position master/slave velocity strategy. The stability analysis is based on Lyapunov-Krasovskii theory where a functional is proposed and analyzed to get conditions for the control parameters that assure a stable behavior, keeping the synchronism errors bounded. Finally, the theoretical result is verified in practice by means of a simple test, where two human operators both collaboratively and simultaneously drive a 3D simulator of a mobile robot to achieve an established task on a remote shared environment.

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All-fiber linear sampling device for absolute distance measurement

10.1109/icocn53177.2021.9563689 ◽

2021 ◽

Author(s):

Chunze Wang ◽

Jiaqi Wang ◽

Guanyu Liu ◽

Ziling Wu ◽

Youjian Song ◽

...

Keyword(s):

Distance Measurement ◽

Absolute Distance ◽

Sampling Device ◽

Linear Sampling

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SI-traceable absolute distance measurement over more than 800 meters with sub-nanometer interferometry by two-color inline refractivity compensation

Applied Physics Letters ◽

10.1063/1.5000569 ◽

2017 ◽

Vol 111 (19) ◽

pp. 191104 ◽

Cited By ~ 7

Author(s):

Karl Meiners-Hagen ◽

Tobias Meyer ◽

Jutta Mildner ◽

Florian Pollinger

Keyword(s):

Distance Measurement ◽

Absolute Distance

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Efficiency over thoroughness in laboratory testing decision-making in primary care: findings from a realist review

BJGP Open ◽

10.3399/bjgpopen20x101146 ◽

2020 ◽

pp. bjgpopen20X101146

Author(s):

Claire Duddy ◽

Geoff Wong

Keyword(s):

Primary Care ◽

Decision Making ◽

Laboratory Testing ◽

Laboratory Tests ◽

Secondary Data ◽

Realist Review ◽

Future Research ◽

Underlying Causes ◽

Important Means ◽

Test Ordering

Background: Existing research demonstrates significant variation in test-ordering practice, and growth in the use of laboratory tests in primary care. Reviews of interventions designed to change test-ordering practice report heterogeneity in design and effectiveness. Improving understanding of clinicians’ decision making in relation to laboratory testing is an important means of understanding practice patterns and developing theory-informed interventions. Aim: To develop explanations for the underlying causes of patterns of variation and increasing use of laboratory tests in primary care and make recommendations for future research and intervention design. Design and setting: Realist review of secondary data from primary care. Method: Diverse evidence including data from qualitative and quantitative studies was gathered via systematic and iterative searching processes. Data was synthesised according to realist principles to develop explanations accounting for clinicians’ decision-making in relation to laboratory tests. Results: 145 documents contributed data to the synthesis. Laboratory test ordering can fulfil many roles in primary care. Decisions about tests are incorporated into practice heuristics and tests are deployed as a tool to manage patient interactions. Ordering tests may be easier than not ordering tests in existing systems. Alongside high workloads and limited time to devote to decision-making, there is a common perception that laboratory tests are relatively inconsequential interventions. Clinicians prioritise efficiency over thoroughness in decision-making about laboratory tests. Conclusions: Interventions to change test-ordering practice can be understood as aiming to preserve efficiency or encourage thoroughness in decision-making. Intervention designs and evaluations should consider how testing decisions are made in real-world clinical practice.

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