Comparisons of the reference measuring instruments of surface parameters

Metrologia ◽  
2015 ◽  
Vol 52 (1A) ◽  
pp. 04012-04012
Author(s):  
Vladimir Kupko ◽  
Valeriy Lysenko
Keyword(s):  
Measuring Instruments ◽  
Reference Measuring ◽  
Surface Parameters

scholarly journals Determination of the Error in Transferring of Length Unit’s Size when Measuring the Nanoparticles’ Diameter Using an Analyzer of Particles’ Differential Electrical Mobility

2021 ◽  
Vol 12 (3) ◽  
pp. 194-201
Author(s):  
V. L. Solomakho ◽  
A. A. Bagdun
Keyword(s):  
Particle Size ◽  
Size Distribution Function ◽  
Measuring Instruments ◽  
Random Component ◽  
Electrical Mobility ◽  
Standard Samples ◽  
Reference Measuring ◽  
Condensation Particle Counter ◽  
Uniformity Of Measurements ◽  
Unit Of Length

The quality of nanomaterials and nanotechnologies is largely determined by the stability of the applied technologies, which, to a large extent, depend on the constancy of particle sizes. In this regard, metrological problems arise that are associated both with measuring the dimensions of the microstructure of aerosols, suspensions and powders, and with ensuring the uniformity of measurements when transferring a unit of a physical quantity from a standard to working measuring instruments. The purpose of this work was to determine and calculate the error in transferring the size of a unit of length when measuring the diameter of nanoparticles.An analyzer of differential electric mobility of particles was determined as a reference measuring instrument for which the calculation was made. It allows the separation of aerosol particles based on the dependence of their electrical mobility on the particle size. In combination with a condensation particle counter, it allows you to scan an aerosol and build a particle size distribution function. This measurement method is the most accurate in the field of measuring the diameters of particles in aerosols, therefore, the error in the transmission of particle size must be set as for a standard.The paper describes the physical principles of measurement by this method and presents an equation for determining the diameter of nanoparticles. Based on this equation, the sources of non-excluded systematic error were identified. Also, an experimental method was used to determine the random component of the measurement error of nanoparticles and to calculate the error in transferring the size of a unit of length when measuring the diameter of nanoparticles.The obtained results will be used for metrological support of standard samples of particle size, ensuring traceability of measurements of aerosol particle counters and for aerosol research.

scholarly journals The Manufacturing of Low Temperature Measuring Devices Using a PT-100 Sensor Based on ATmega328 Microcontroller

2020 ◽  
Vol 21 (1) ◽  
pp. 26
Author(s):  
Bhakti Hardian Yusuf ◽  
I Made Satriya Wibawa ◽  
I Ketut Putra
Keyword(s):  
Low Temperature ◽  
Coefficient Of Determination ◽  
Measuring Instruments ◽  
Measured Temperature ◽  
Measuring Instrument ◽  
Reference Measuring ◽  
Measuring Device ◽  
Temperature Measuring ◽  
Measurement Results ◽  
Reference Measuring Instrument

A low temperature measuring device has been successfully developed using a microcontroller-based PT-100 sensor ATmega328. The temperature is measured using a PT-100 sensor, as the main processor using the ATmega 328 microcontroller, and the measured temperature is displayed on a 2x16 LCD. The results of the calibration at a temperature of 77 - 300 K against the reference measuring instrument obtained that, the ratio of the measured temperature between the reference measuring instrument and the measuring instrument made was 0.9893 ± 3.69 K and the coefficient of determination R2 = 0.9987. This indicates that the measurement results of the measuring instruments made have an accuracy level of 98.93% and a precision of 99.87%. Keywords: Low temperature, PT-100 Sensor, ATmega328 Microcontroller, LCD 2x16

Total haemoglobin – a reference measuring system for improvement of standardisation

2020 ◽  
Vol 58 (8) ◽  
pp. 1314-1321
Author(s):  
Denis Grote-Koska ◽  
Rainer Klauke ◽  
Patricia Kaiser ◽  
Udo Kramer ◽  
Rainer Macdonald ◽  
...  
Keyword(s):  
Measurement Uncertainty ◽  
Measurement Range ◽  
Measuring System ◽  
Measuring Instruments ◽  
National Metrology Institute ◽  
Reference Measuring ◽  
Target Values ◽  
Method Optimization ◽  
Total Haemoglobin ◽  
Hb Concentration

AbstractBackgroundTotal haemoglobin (Hb) concentration in blood belongs to the most requested measurands, and the HiCN method (hemiglobincyanide) is accepted as a reference. Although the reaction principle is clearly characterised, measurement conditions and settings are not consistently defined, some of them influencing the results. An improvement of standardisation is the object.MethodsAfter method optimization, measurement results between different calibration laboratories (CL) were compared with each other and also with results of the National Metrology Institute of Germany (PTB), with target values of certified reference material, within the RELA scheme, and to >1500 results from routine laboratories.ResultsOverall deviations between three CLs were ≤0.5% (n = 24 samples) in a measurement range of 20 g/L to 300 g/L. A CV of 0.4% was determined in pooled blood (1 year long-term imprecision, 99.0%–101.1% recovery of the mean). For selected measurements (n = 4 samples) the PTB participated without significant differences to three CLs, and no significant differences were observed comparing CLs to certified values of reference materials. The expanded measurement uncertainty (probability 95%) was estimated as 1.1%.ConclusionsA reference measuring system, comprising measuring instruments and other devices, including reagents and supply, to generate reference measurement values for total Hb concentration of high accuracy and low measurement uncertainty is presented. Measurement parameters are investigated and defined. The reference measuring system is ready to offer service to EQA providers and to the IVD industry for certifying control materials or calibrators.

scholarly journals DESIGN AND DEVELOPMENT OF AIR MONITORING AND QUALITY CONTROL DEVICE USING ARDUINO UNO

2019 ◽  
Vol 1 (1) ◽  
pp. 8-11
Author(s):  
I wayan Sudiardana ◽  
Widodo .
Keyword(s):  
Descriptive Analysis ◽  
Control Device ◽  
Gas Content ◽  
Percentage Error ◽  
Measuring Instruments ◽  
Analysis Method ◽  
Monitoring And Control ◽  
Reference Measuring ◽  
Average Percentage ◽  
Average Percentage Error

LPG (Liquid Petroleum Gas) has been used in everyday life. But if there is leakage it will cause poisoning and explosion. Underlying this, the authors made research on monitoring and control of air quality. The purpose of this study is to make a device that can detect earlier leakage of LPG. This device can detect excess levels of carbon monoxide in the air. Even more, it can avoid the danger of fire and poisoning. The research method used descriptive analysis method and quantitative analysis method. Measurements and testing with accurate reference measuring instruments. Based on testing and analysis, the device can work well with an average percentage error of 1.92% for CO gasmeasurement and 3.1% for LPG gas measurement. Increasing gas content in each sensor is proportional of increasing in the sensor output voltage. Some of the factors that cause errors were the differences of sensor sensitivity and environmental conditions where the sample measured.

THE ENHANCEMENT OF METROLOGICAL SUPPORT THE COATING THICKNESS MEASUREMENTS

2020 ◽  
pp. 36-39
Author(s):  
S. S. Golubev ◽  
L. S. Babadzhanov ◽  
M. L. Babadzhanova ◽  
T. A. Koryushkina
Keyword(s):  
Metrological Support ◽  
Coating Thickness ◽  
Measurement Errors ◽  
Measuring Instruments ◽  
Reference Measuring ◽  
Uniformity Of Measurements ◽  
Foreign Production ◽  
Unit Of Length ◽  
Unity Of Measurements ◽  
Thickness Measurements

The article shows an improved hierarchy scheme in the field of coating thickness measurements, which was revised due to inclusion to Federal Information Fund for Ensuring the Uniformity of Measurements more than a hundred new types of Russian and foreign thickness gauges based on of different operating principles. The range of measurements has expanded and accuracy has been improved. It is shown that about 40 % of the approved types of thickness gauges are measuring instruments of foreign production. For responsible groups of materials (nickel on steel and nickel on bronze), only foreign coating thickness gauges are used. To improve the unity of measurements of the coatings thickness, it was necessary to expand the measurement ranges of the reference measuring standards and thickness gauges from 0 to 120 000 microns, as well as the introduction of new measuring standards borrowed from other hierarchy schemes. The article provides the necessary reference measuring standards and thickness gauges, methods for transmitting a unit of length, measuring ranges and measurement errors.

Correction of verification intervals of reference measuring instruments

1990 ◽  
Vol 33 (4) ◽  
pp. 296-299
Author(s):  
A. P. Blinov ◽  
S. F. Levin ◽  
A. P. Antipov ◽  
A. A. Kolyshkov ◽  
I. V. Sap'yanik
Keyword(s):  
Measuring Instruments ◽  
Reference Measuring

Soviet reference measuring instruments exhibited in London

1969 ◽  
Vol 12 (1) ◽  
pp. 144-145
Author(s):  
V. I. Pronenko ◽  
G. G. Petrosyan
Keyword(s):  
Measuring Instruments ◽  
Reference Measuring

Concept of a new PZT

1978 ◽  
Vol 48 ◽  
pp. 271-278
Author(s):  
Chr. Kühne
Keyword(s):  
Mirror System ◽  
Measuring Instruments

The PZT according to MARKOWITZ, undoubtedly one of the most accurate measuring instruments, has become an integral part of astronomy in the last years. Yet there are two reasons why I still tried to improve the MARKOWITZ basic idea.For the MARKOWITZ process the use of a lens objective is imperative. Because of the diameter limitations of the lens objectives the magnitude is reduced. Although a 65 cm PZT has been put into operation in Washington recently, the thermal difficulties encountered made it necessary to control the temperature actively. In addition, the 65 cm diameter of a lens equipped with 4 elements can be considered as the very limit, but not for a mirror system.In addition there are still more disadvantages using lens objectives. The useable field is restricted by astigmatism, reducing the range of declination. The transmission, especially in the blue wavelengths, decreases very rapidly with the thickness of lenses. For large multilens objectives the transmission is less than for a mirror system.

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