scholarly journals Calibration platform controller of the laser Doppler anemometer

2021 ◽  
Vol 2057 (1) ◽  
pp. 012092
Author(s):  
V G Glavnyi ◽  
V V Rakhmanov ◽  
S V Dvoynishnikov ◽  
S V Krotov ◽  
V G Meledin
Keyword(s):  
Rotation Speed ◽  
Laser Doppler Anemometer ◽  
Laser Doppler ◽  
Measurement Standard ◽  
Rotating Disc ◽  
Disk Rotation ◽  
Primary Measurement ◽  
Primary Measurement Standard ◽  
Air Flow Velocity ◽  
Primary Standards

Abstract Primary standards for the unit of air flow velocity often use a Laser Doppler Anemometer (LDA) as the primary measurement standard. A rotating disc with a fixed diameter is used to calibrate LDA. The paper proposes calibration platform based on the precision mechanics of HDD disk. A disk rotation controller has been developed for the platform. Deviations of the disk rotation speed do not exceed 0.01% RMS in the range of angular speeds of 600-4800 rpm.

State primary measurement standard of ultrasound power unit in water GET 169-2019

2020 ◽  
pp. 3-8
Author(s):  
Аlexander М. Еnyakov ◽  
Sergey I. Kuznetsov ◽  
Georgiy S. Lukin
Keyword(s):  
Power Unit ◽  
Radiation Effect ◽  
High Tech ◽  
Measuring Instruments ◽  
Measurement Standard ◽  
Primary Measurement ◽  
Accuracy Of Measurements ◽  
Special Measurement ◽  
Primary Measurement Standard ◽  
Ultrasound Power

Results of works on improvement of the state primary special measurement standard of ultrasound power unit in water GET 169-2005 are given. As a result of the inclusion of two new reference ultrasound power meters in the standard, the frequency and dynamic ranges of reproduction and transmission of the power unit to lower-level measuring instruments were expanded using absorbing targets for measuring the radiation effect of the ultrasonic wave and the absorbed ultrasonic energy. That is very important for metrological support of modern high-tech medical ultrasound equipment, including focused high-intensity ultrasound beams for the treatment of cancer. The automation of the measurement process used in the updated standard has reduced significantly the complexity of verification procedures increasing the accuracy of measurements.

scholarly journals Multiparametric reference materials for metrological support in the area of coating parameter control

2019 ◽  
Vol 14 (3-4) ◽  
pp. 9-15
Author(s):  
V. V. Kazantsev ◽  
A. S. Vasilyev
Keyword(s):  
Reference Materials ◽  
Metrological Support ◽  
Surface Density ◽  
The State ◽  
Measurement Standard ◽  
Measuring Surface ◽  
Primary Measurement ◽  
Primary Measurement Standard ◽  
Coating Parameter ◽  
Development Prospects

The present work analyses the state and development prospects of metrological support and standardization of in the field of measuring surface density, thickness and chemical composition of coatings. The main characteristics of the State Primary Measurement Standard GET 168-2015 and developed multiparameter reference materials are described.

scholarly journals Study on the process of droplet formation when liquid flows out of a capillary

2021 ◽  
Vol 939 (1) ◽  
pp. 012033
Author(s):  
A Lee ◽  
B Utepov ◽  
E Kan ◽  
O Kuychiev
Keyword(s):  
Rotation Speed ◽  
Air Flow ◽  
Rotation Frequency ◽  
Rotational Frequency ◽  
Theoretical Background ◽  
Air Velocity ◽  
Droplet Flow ◽  
Disk Rotation ◽  
Air Flow Velocity ◽  
Liquid Flows

Abstract This article presents the theoretical background for the justification of the parameters of the rotating sprayer. Theoretical studies show that an increase in the rotation frequency of the disk at a constant air flow velocity leads to a minimum median mass diameter of the droplets. Therefore, when justifying the diameter of the sprayed droplets, it is necessary to consider the combination of the disk rotation speed and the axial velocity of the air flow. To obtain high-quality air-droplet flow, the initial speed of the main droplets discharged from the periphery of the spray disc should be less than the air velocity and rotational frequency Pavlovskyi spray is recommended to be applied with in ω=60… 200 c1.

Development of the primary measurement standard for gaseous radon-222 activity

2012 ◽  
Vol 70 (9) ◽  
pp. 1934-1939 ◽  
Author(s):  
B.C. Kim ◽  
K.B. Lee ◽  
T.S. Park ◽  
J.M. Lee ◽  
S.H. Lee ◽  
...  
Keyword(s):  
Measurement Standard ◽  
Primary Measurement ◽  
Primary Measurement Standard
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