Analysis of angle measurement uncertainty for wMPS

2010 ◽  
Author(s):  
Lei Geng ◽  
Jigui Zhu ◽  
Xueyou Yang ◽  
Zhi Xiong
Keyword(s):  
Measurement Uncertainty ◽  
Angle Measurement

scholarly journals Angle measurement uncertainty statistical distribution of pulsed laser quadrant photodetector

2017 ◽  
Vol 66 (1) ◽  
pp. 012901
Author(s):  
Zhang Wei ◽  
Zhang He ◽  
Chen Yong ◽  
Zhang Xiang-Jin ◽  
Xu Xiao-Bin
Keyword(s):  
Measurement Uncertainty ◽  
Pulsed Laser ◽  
Angle Measurement ◽  
Statistical Distribution ◽  
Quadrant Photodetector

National primary standard machine of Shore D hardness scale for metals and Leeb hardness scales

2020 ◽  
pp. 6-10
Author(s):  
A.E. Aslanyan ◽  
E.G. Aslanyan ◽  
S.M. Gavrilkin ◽  
A.S. Doynikov ◽  
A.N. Shchipunov
Keyword(s):  
Measurement Uncertainty ◽  
Primary Standard ◽  
Metrological Characteristics ◽  
National Primary Standard ◽  
Hardness Scale ◽  
Leeb Hardness

The article presents the results of studies to improve the National primary standard machine for hardness of metals on the shore D scale GET 161-2001, which were performed in FSUE “VNIIFTRI” from 2016 to 2018 in accordance with the technical task of Rosstandart.The improvement was carried out in order to ensure the uniformity of hardness measurements on the Leeb scales. The created new parts of the primary standard machine, which are settings for reproducing hardness numbers on the Leeb scales, are considered. Metrological characteristics of the upgraded and adopted National primary standard machine (GET 161-2019) were investigated, the budget of measurement uncertainty was calculated for reproducing hardness numbers on the Leeb scales.

One-shot Multi-angle Measurement Device for Evaluating the Sparkle Impression

2020 ◽  
Vol 2020 (5) ◽  
pp. 60401-1-60401-8
Author(s):  
Shuhei Watanabe
Keyword(s):  
Spatial Frequency ◽  
Product Design ◽  
Angle Measurement ◽  
Observation Angle ◽  
Light Sources ◽  
Quantification Method ◽  
Material Appearance ◽  
Subjective Score ◽  
Measurement Devices ◽  
Rotation Stage

The quantification of material appearance is important in product design. In particular, the sparkle impression of metallic paint used mainly for automobiles varies with the observation angle. Although several evaluation methods and multi-angle measurement devices have been proposed for the impression, it is necessary to add more light sources or cameras to the devices to increase the number of evaluation angles. The present study constructed a device that evaluates the multi-angle sparkle impression in one shot and developed a method for quantifying the impression. The device comprises a line spectral camera, light source, and motorized rotation stage. The quantification method is based on spatial frequency characteristics. It was confirmed that the evaluation value obtained from the image recorded by the constructed device correlates closely with a subjective score. Furthermore, the evaluation value is significantly correlated with that obtained using a commercially available evaluation device.

Selected Problems of Measurement Uncertainty — Part 2

2008 ◽  
Vol 11 (-1) ◽  
pp. 265-276
Author(s):  
Sylwester Kłysz ◽  
Janusz Lisiecki
Keyword(s):  
Measurement Uncertainty

Selected Problems of Measurement Uncertainty — Part 1

2008 ◽  
Vol 11 (-1) ◽  
pp. 253-264
Author(s):  
Sylwester Kłysz ◽  
Janusz Lisiecki
Keyword(s):  
Measurement Uncertainty

Automated dihedral angle measurement in liquid phase sintered alloys

2004 ◽  
Vol 95 (1) ◽  
pp. 3-7 ◽  
Author(s):  
P. Chhillar ◽  
S. Sangal ◽  
A. Upadhyaya
Keyword(s):  
Liquid Phase ◽  
Dihedral Angle ◽  
Angle Measurement ◽  
Sintered Alloys

Investigation of the Accuracy of Reference Instruments for Measuring Vertical Angles by Reference Method of Their Calibration

2020 ◽  
pp. 3-14
Author(s):  
O. M. Samoylenko ◽  
O. V. Adamenko ◽  
B. P. Kukareka
Keyword(s):  
Horizontal Plane ◽  
Opposite Sign ◽  
Reference Method ◽  
Angle Measurement ◽  
Measurement Standard ◽  
Vertical Angle ◽  
Measurement Standards ◽  
Measurement Results ◽  
Electronic Measurement ◽  
Systematic Biases

Reference method for simultaneous calibration of the three and more measurement standards for vertical angle measurement is developed. This method can to use for obtaining the systematic biases of the vertical angles measurements for each of the measuring standards relative of the horizontal plain was averaged from measurement results in time their calibration or comparison. For realization of the reference method was developed the autocollimationel electronic measurement standard for the automatization measurement of the vertical angles SeaLineZero_Standard™ (SLZ_S™). Summary standard deviation (k=1) of the vertical angle measurement relative the horizontal plane, from the results of their calibration by reference method, is not more 0,07ʺ…0,15ʺ. This result was obtained without the use the systematic biases, for each measurement standards, as measurements corrections (with opposite sign). The measuring standards, that were developed and researched, are necessary for obtaining the systematic biases of the vertical angle measurement for total stations and theodolites, that have the normed standard error 0,5ʺ and 1ʺ, when these instruments are calibrating.

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