scholarly journals Application of Measurement Signal Reduction to Improve Measurement Accuracy

2018 ◽  
Vol 7 (4.36) ◽  
pp. 1035
Author(s):  
Rustem R. Ziyatdinov ◽  
Leisan R. Zakirova
Keyword(s):  
Measuring Channel ◽  
Operational Amplifiers ◽  
Degree Of Polarization ◽  
Measured Signal ◽  
Random Component ◽  
Temperature Drift ◽  
Measuring Device ◽  
Improve Measurement ◽  
Accuracy Of Measurements ◽  
Causes Of Errors

Most modern technical tasks require high precision measurements. To do this, it is necessary to analyze the causes of errors and take measures to reduce their influence on the accuracy of measurements. The causes of errors are very diverse and cannot always be identified. However, some systematic components of the measurement error can be described and calculated mathematically. In this case, the task of reducing the signal at the output of a measuring device to the form it would have when using an “ideal” device is reduced to calculating a certain linear operator which product to the measured signal allows obtaining the minimum systematic error. In this paper, the application of the reduction method is given by the example of a measuring instrument for the degree of polarization of light radiation which comprises three measuring channels for measuring the intensity of linearly polarized radiation. Each channel is built with the use of three operational amplifiers. The main errors of a measuring channel that can be described and determined are the errors of the operational amplifiers associated with the bias voltages and temperature drift. In real measuring systems there are much larger of such components. However, the use of computer equipment for modeling systems and processes, as well as measurements, removes all restrictions on the possibilities of processing the obtained data in a software way. With the help of computer technology it is possible to reduce the influence of perturbing effects and systematic errors, and also to eliminate gross errors. The random component of an error can be reduced by increasing the number of measurements and carrying out statistical data processing.   

scholarly journals Simulation of the analogue interface for remote measurements

2019 ◽  
pp. 39-47
Author(s):  
L. V. Kuzmych ◽  
D. P. Ornatskyi ◽  
V. P. Kvasnikov
Keyword(s):  
Classical Method ◽  
Measuring Channel ◽  
Influential Factors ◽  
Strain Gauges ◽  
Remote Measurement ◽  
Random Component ◽  
Correlated Noise ◽  
Structural Scheme ◽  
Accuracy Of Measurements ◽  
Remote Measurements

This work is aimed at finding possibilities for increasing the accuracy of measurements and interfering analog interfaces for remote measurements using resistive strain gauges by introducing a new structural scheme, which is shown on the Fig. 1. It shows us the Schematic of the electrical functional analog interface for remote measurement using multiplexer and resistive strain gauges, which contains a measuring chain, a transmitter, the input of which is connected to a DC source through an analog demultiplexer, and the outputs of the measuring chain through the analog multiplexer are connected to the measuring amplifier, and a two-channel analog-digital converter with simultaneous sampling. The measuring chain is made in the form of three resistive current dividers, where one divider is formed by a resistive strain gauge and adjusting resistor, and two others – exemplary resistors.By introducing a new structural scheme, it will be possible to increase the accuracy of measurements and impedance of analog interfaces for remote measurements using resistive strain gauges. In this case, unlike the classical method of model measures, this method is distinguished by the «indistinguishability» of the measuring line, which makes it possible to compensate for a greater number of influential factors, in particular, the correlated noise of operational amplifiers and noise caused by the presence of the overall ground loop, the resistance of analogue switches and lines of communication.At the Fig. 2 we can see the electric model of the measuring channel in the software Elektronic Workbench.From the analysis of the simulation results it was found that the random additive component of the error would dominate. Since in the simulation of the only random component of the error there is a quantization error, the use of the differential method of measuring the output voltage will significantly improve the metrological characteristics.

Half division two-dimensional method for simple sinusoidal quantities parameters accurate measurement

2021 ◽  
pp. 16-21
Author(s):  
Kirill Yu. Solomentsev ◽  
Vyacheslav I. Lachin ◽  
Aleksandr E. Pasenchuk
Keyword(s):  
Measuring Instruments ◽  
Measured Signal ◽  
Two Dimensional ◽  
Measuring Device ◽  
New Approach ◽  
Precision Measuring ◽  
Useful Signal ◽  
Midpoint Method ◽  
Order Of Magnitude ◽  
Current Measuring

Several variants of half division two-dimensional method are proposed, which is the basis of a fundamentally new approach for constructing measuring instruments for sinusoidal or periodic electrical quantities. These measuring instruments are used in the diagnosis of electric power facilities. The most general variant, called midpoint method, is considered. The proposed midpoint method allows you to measure much smaller than using widespread methods, alternating currents or voltages, especially when changing the amplitude of the measured signal in very wide ranges, by 1–2 orders of magnitude. It is shown that using the midpoint method it is possible to suppress sinusoidal or periodic interference in the measuring path, in particular, to measure small alternating current when sinusoidal or periodic interference is 1–2 orders of magnitude higher than the useful signal. Based on the results of comparative tests, it was found that the current measuring device implementing the midpoint method is an order of magnitude more sensitive than the currently used high-precision measuring instruments.

scholarly journals Computer-Integrated Device for Acidity Measurement Monitoring in Greenhouse Conditions with Compensation of Destabilizing Factors

2020 ◽  
Vol 19 (4) ◽  
pp. 243-253
Author(s):  
Ivan S. Laktionov ◽  
Oleksandr V. Vovna ◽  
Maryna M. Kabanets ◽  
Iryna A. Getman ◽  
Oksana V. Zolotarova
Keyword(s):  
Experimental Studies ◽  
Effect Of Temperature ◽  
Synthesis Methods ◽  
Random Component ◽  
Monitoring And Control ◽  
Measuring Device ◽  
Measurement Monitoring ◽  
Cloud Computing Service ◽  
Computerized Monitoring ◽  
Integrated Device

The purpose of the article is to improve procedures of computerized monitoring and control of technological processes of growing greenhouse crops by substantiating methods of improving the accuracy of computer-integrated devices for measuring irrigation solution acidity. The article solves the topical scientific and applied problem of determining the conversion characteristics of computerized acidity monitoring systems with integral and differential assessment of their metrological parameters. Theoretical and experimental studies were obtained based on structural-algorithmic synthesis methods for information-measuring systems; methods of mathematical planning of experiments; regression analysis of experimental data and the concept of uncertainty. The computerized acidity meter was implemented on the basis of an ion-selective pH electrode, Arduino microprocessor platform, and ThingSpeak cloud computing service. The relative total boundary uncertainty of acidity measurement is not more than ±1.1 %. Methods of compensating of the random component of uncertainty based on the median filtering algorithm and additional uncertainty from the destabilizing effect of temperature were introduced when implementing the measuring device. Promising areas of priority research to improve the efficiency of the developed computerized acidity meter were justified. The developed device can be used in the complex automation of greenhouse cultivation processes. The developed and implemented measuring tool can be used when planning agricultural operations in greenhouse conditions.

Calibration of ultrasound tester delay time by cutting a wooden beam

2020 ◽  
Vol 110 ◽  
pp. 131-139
Author(s):  
Zbigniew Karwat
Keyword(s):  
Time Delay ◽  
Ultrasonic Wave ◽  
Independent Method ◽  
Measured Signal ◽  
Test Results ◽  
Measuring Device ◽  
Reliable Test ◽  
Metal Disc ◽  
Standard Calibration ◽  
Signal Time

Obtaining precise and reliable test results requires specific tools on one hand, and at the same time, reliability of the results should not be questioned. One of the necessary steps to achieve this goal is the calibration of the measuring device before the test. This article describes an experiment involving calibration of the device by an independent method called cutting beam calibration carried out on the ultrasonic material tester UMT 01. The standard calibration of this device is carried out by using a dedicated metal disc as a template. Calibration of the tester consisted of determining the time delay of the measured signal. The obtained results were used to prepare charts and to determine of signal time delay, called correction, which also allowed determining the velocity of ultrasonic wave in the tested material in three ways. The experiment was conducted on samples of three species of wood: Norway spruce, Scots pine and sycamore. The velocity of ultrasonic wave from research was compared with literature data.

scholarly journals COMPARISON OF ULTRASONIC PULSE VELOCITY TEST RESULTS WITH AND WITHOUT USING TRANSDUCER STABILIZER

2020 ◽  
Vol 25 (1) ◽  
pp. 12
Author(s):  
Fajar Surya Herlambang ◽  
Evin Yudhi Setyono
Keyword(s):  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Test Results ◽  
Data Collection Process ◽  
Improve Measurement ◽  
Accuracy Of Measurements ◽  
Measurement Results ◽  
Test Position ◽  
The Stability

Some research on the Ultrasonic Pulse Velocity (UPV) test has not covered much about the problems encountered during the data collection process. Based on experience using UPV test equipment, it is known that instability occurs in reading the test results. This is caused by the inability of the operator, in maintaining the stability of the transducer both in its position and pressure, especially in the measurement with the overhead position. Therefore, in this study a tool was made to make the transducer stable in the test position. Comparison of measurement results shows that, the uncertainty of wave velocity measurement decreases from the range of 4% -17% to 0.2% -0.4%. Meanwhile, the uncertainty of measurement of wave travel time decreased from the range of 0.8% -14% to 0.1% -0.4%. This can be interpreted that, the level of accuracy of measurements using a transducer stabilizer is 99.6% -99.9%. Thus, the use of transducer stabilizers is believed to be able to improve measurement accuracy.

Grey Dynamic Filtering in the Non-Diffracting Beam Triangulation Measurement

2013 ◽  
Vol 278-280 ◽  
pp. 753-756
Author(s):  
Jian Ning Yang ◽  
Qian Qian Wang ◽  
Zhou Qing
Keyword(s):  
Measurement System ◽  
Measurement Accuracy ◽  
Low Frequency ◽  
Speckle Noise ◽  
Grey System Theory ◽  
Second Step ◽  
Measured Signal ◽  
Grey System ◽  
Improve Measurement ◽  
Dynamic Filtering

To solve the problem of speckle noise, CCD photoelectric noise and background light noise in non-diffracting beam triangulation and improve measurement accuracy and resolution, we use gray dynamic filtering theory. In the non-diffraction beam triangulation measurement system, the measured signal is reconstructed at the maximum peak of the spots by implementing the dynamic GM genetic filtering methods based on the grey system theory. There are only four main steps of modeling. The first step is to update the system dynamically and continuously. The second step is to effectively obtain low frequency trend component,The third step is solving the problem of the low rate of complex multi-measurement.The last is solve the problem of the limit of unsuitable online measurement. This method of triangulation measurement based on the non-diffracting beam have higher measurement accuracy and higher resolution over the traditional laser triangulation measurement system.

scholarly journals Proposed Use of Monte Carlo Simulated Images to Evaluate the Accuracy of Measurements on X-Ray Computed Tomography

2018 ◽  
Vol 18 (6) ◽  
pp. 251-255
Author(s):  
Tomasz Kowaluk ◽  
Maciej Maciak ◽  
Adam Woźniak ◽  
Piotr Tulik ◽  
Natalia Golnik
Keyword(s):  
Computed Tomography ◽  
Monte Carlo ◽  
Data Processing ◽  
Measurement Accuracy ◽  
X Ray ◽  
Improve Measurement ◽  
Accuracy Of Measurements ◽  
X Ray Computed ◽  
The Impact ◽  
Simulated Images

Abstract X-ray computed tomography (CT) is increasingly recognized as a promising measuring technique for dimensional metrology. Various methods are being developed to improve measurement accuracy. Tests of new methods for such applications include accuracy evaluation with the use of calibrated workpieces; however, the internal algorithms of image acquisition and data processing might influence the experimental error, and then also the comparison of methods at different CTs. The accuracy of the results of tomographic measurements is influenced by many factors, one of which is the setting of the threshold value. The article presents the results of an attempt to use Monte Carlo simulated images to estimate deviations to determine threshold values to improve measurement accuracy and additionally, to estimate the impact of data processing. The differences of the results obtained from the simulated images were up to 4 % larger than those from tomographic images. It was caused by degradation of the image contrast by scattered radiation.

Sign in / Sign up

Export Citation Format

Share Document