EARTHTIME NEEDS AND PATHS FORWARD IN HIGH PRECISION-HIGH ACCURACY ARGON GEOCHRONOLOGY

2016 ◽  
Author(s):  
Matthew T. Heizler ◽  
Keyword(s):  
High Precision ◽  
High Accuracy

Experience and results obtained at the ESRF with high-precision air bearing motion systems

2011 ◽  
Vol 1 (MEDSI-6) ◽  
Author(s):  
P. Marion ◽  
L. Ducotte ◽  
M. Nicola ◽  
H. P. van der Kleij ◽  
L. Eybert ◽  
...  
Keyword(s):  
High Precision ◽  
High Accuracy ◽  
Air Bearing ◽  
Air Bearings ◽  
Positioning Accuracy ◽  
Point Of Interest ◽  
Air Film

In high-accuracy motion stages, the positioning accuracy at the point of interest is strongly influenced by guiding errors: for translation motions, straightness errors and angular errors (pitch, yaw and roll); for rotation motions, axial, radial and tilt errors. When air bearings are used for guiding, the air film averages out local irregularities of bearings surfaces, which helps reduce guiding errors considerably. Some results obtained with air bearing precision systems designed and manufactured by specialized companies and tested at ESRF are described below.

The Construction Basis of High-Precision Optical Range Finder GD-j1(l)

2018 ◽  
Vol 931 ◽  
pp. 681-686
Author(s):  
Hovsep S. Petrosyan ◽  
Yegisabeth H. Hayrapetyan ◽  
Hovnan A. Hunanyan
Keyword(s):  
High Precision ◽  
Linear Measurement ◽  
High Accuracy ◽  
Compensation Method ◽  
Interference Method ◽  
Modulation Method ◽  
Range Finder ◽  
Optical Range ◽  
Linear Measurements ◽  
Measurement Devices

The methods of construction of high-precision rangefinder on the modulation method, which will complement the means of linear measurements on the interference method, are considered. The linearly compensation method, which leads to the possibility of implementing range finders with an error of mφ=0.01 mm, is proposed as the basic constructions of extremely high accuracy linear measurement devices.

High‐Precision, High‐Accuracy Oxygen Isotope Measurements of Zircon Reference Materials with the SHRIMP‐SI

2019 ◽  
Vol 44 (1) ◽  
pp. 85-102 ◽  
Author(s):  
Janaína N. Ávila ◽  
Trevor R. Ireland ◽  
Peter Holden ◽  
Peter Lanc ◽  
Andrew Latimore ◽  
...  
Keyword(s):  
Oxygen Isotope ◽  
High Precision ◽  
Reference Materials ◽  
High Accuracy ◽  
Isotope Measurements

scholarly journals The Large-Field Bright-Star High-Precision CCD Photometer of BAO

1995 ◽  
Vol 167 ◽  
pp. 325-326
Author(s):  
Shiyang Jiang
Keyword(s):  
High Precision ◽  
Single Channel ◽  
High Accuracy ◽  
Bright Star ◽  
Large Field ◽  
Comparison Star ◽  
General Description ◽  
High Quantum Efficiency ◽  
Stellar Photometry ◽  
Long Time

Time-series high-accuracy photometry is very important for research in stellar variability. For a long time photometry made by a photomultiplier was the only instrument for high precision stellar photometry. To overcome the atmospheric variation and instrumental problems, we must choose at least one stable star as a comparison star and move the telescope quickly between the targets. So the real efficiency is very low and one only can do it on photometric nights. To overcome this limitation, since 1989 we began to cooperate with the team of the STEPHI network. We used the Chevreton four-channel photometer which can observe the variable, two comparison stars and a chosen sky background simultaneously. The multi-channel photometer is much better than normal single channel photometer as we can see from the several STEPHI results. Now the very high quantum efficiency CCD becomes more and more popular, so we are trying to change to use CCDs. Here we give some general description of a large field high accuracy bright star CCD photometer being prepared for the Beijing Astronomical Observatory (BAO).

Development of a Multi-Function Virtual Instrument Based on a Constant Current Source

2013 ◽  
Vol 385-386 ◽  
pp. 492-495
Author(s):  
Dong Bing Dai ◽  
Ya Jun Wang ◽  
Ye Ping Sun ◽  
Zheng Guang Liu
Keyword(s):  
Data Acquisition ◽  
High Precision ◽  
High Power ◽  
Virtual Instrument ◽  
Current Source ◽  
High Accuracy ◽  
Constant Current ◽  
Constant Current Source ◽  
Data Acquisition Card ◽  
Further Development

Virtual instrument is a result of the computer combined with some instrument hardware, working for the instrumentation applications, it is one trend of the instrumentation development .This paper presents a design of a high-power and high-precision constant current source, studied three different electrical testing technologies based on constant current source and propose the principle of integrated the three electrical test technologies on a virtual instrument platform. A multi-function virtual instrument system based on LabView language, USB data acquisition card and a constant current source has been developed. This system has a high accuracy, high integration and a thecapability of further development etc..

High-precision and high-accuracy rovibrational spectroscopy of molecular ions

2013 ◽  
Vol 139 (16) ◽  
pp. 164201 ◽  
Author(s):  
James N. Hodges ◽  
Adam J. Perry ◽  
Paul A. Jenkins ◽  
Brian M. Siller ◽  
Benjamin J. McCall
Keyword(s):  
High Precision ◽  
High Accuracy ◽  
Molecular Ions ◽  
Rovibrational Spectroscopy

Multi-Sensor Data Fusion Based on ADS-B and MLAT in Approach

2014 ◽  
Vol 602-605 ◽  
pp. 2491-2494
Author(s):  
Yu Lu ◽  
Rong Shun Huang ◽  
Zi Li Xu
Keyword(s):  
Data Fusion ◽  
High Precision ◽  
Traffic Control ◽  
Kalman Filters ◽  
Tracking System ◽  
High Accuracy ◽  
Experimental Results ◽  
Sensor Data ◽  
Multi Sensor Data Fusion ◽  
Fusion Framework

ADS-B (Automatic Dependent Surveillance - Broadcast) and MLAT (Multilateration) are the main surveillance techniques for ATC (Air Traffic Control), and will play an important role in the future's tracking system. The fusion between ADS-B and MLAT is able to achieve more accurate tracking. In views of the data characters of these two techniques, this paper designs a concrete fusion framework with multi-levels based on federal Kalman filters to fuse ADS-B and MLAT in approach. Under this framework, both ADS-B and MLAT data are processed intensively to achieve high accuracy. Experimental results based on simulation and practical data illustrate the algorithm can achieve high precision.

Evaluation of Measurement Uncertainty for High Precision Gear Involute Profile Measuring System

2010 ◽  
Vol 97-101 ◽  
pp. 4265-4270
Author(s):  
Yong Ma ◽  
Kuo Wang ◽  
Ke Hong Li ◽  
Li Ding Wang
Keyword(s):  
Control System ◽  
Measurement Uncertainty ◽  
High Precision ◽  
Optical System ◽  
High Accuracy ◽  
Measuring System ◽  
Electronic Control ◽  
Mechanical Parts ◽  
Electronic Control System ◽  
Inspection Process

This paper is concerned with an effective way to evaluate the measurement uncertainty for high precision gear involute profile measuring system in the gear testing centre Mahr891E which was improved both in numerical-electronic control system and mechanical parts . Optical system was used during the inspection process in this paper. The precision of involute profile measuring system in this gear testing centre was known to be available to test gear with high accuracy grade.

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