LabVIEW application for computer simulation of the conversion technique of dual-slope analog-to-digital converter

Odon, A.; Krawiecki, Zbigniew

doi:10.1016/j.measurement.2011.05.009

Cited by 11 publications

(8 citation statements)

References 2 publications

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“…The fact of reaching by the plate the established temperature was proven by the lowered amplitude of temperature fluctuations of each point of plate below the value set by the highest and lowest value of chamber temperature recorded in the course of work. It should be remembered that the measurement made with the use of a thermal imaging camera, like the measurement made with the use of another device, is fraught with uncertainty [3,4]. The presented works were long-lasting.…”

Section: Discussionmentioning

confidence: 97%

Thermal imaging observations of the surface of a gauge block

Dziarski

2019

ITM Web Conf.

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This paper proposes a method for determining the time at which the temperature of surface of a gauge block will be established. The relationship between the temperature of a gauge block, its length and the value of uncertainty of measurement when calibrating using this block was explained. Attention was paid to problems resulting from the applied measurement method. Particular attention was paid to thermal imaging observations of the lateral surface of a gauge block PrefaceThe gauge blocks are rectangular length standards. Most often they are made of tool steel. The dimensions of a gauge block are subject to change as a result of the change in the value of its temperature. A change in the temperature of a gauge block may be caused, among others, by a change in ambient temperature or by a touch of hand. The actual length of the gauge block can be expressed by equation (1).where l s -the length of gauge block at the reference temperature t o = 20 °C given in the calibration certificate, δl D -change in the length of gauge block since the last calibration due to drift, δl -measured difference in the length of both gauge blocks, δl Ccorrection for non-linearity and inaccuracy of the comparator setting, L -nominal length of gauge block, α '-mean value of the thermal expansion coefficient of both gauge blocks, δl t -temperature difference of gauge blocks, δ α -difference of the thermal expansion coefficients of both gauge blocks, Δt'deviation of the mean temperature of gauge block and a plate calibrated from the ambient temperature, δl v -correction for the non-centricity of contact with the measuring surfaces of gauge block.While analysing the above equation one can notice the effect of temperature of gauge blocks on the determined difference in length between the gauge block and calibrated plate and the uncertainty of the difference measured. For this reason, in order to measure the difference between the length of gauge block and the calibrated plate, the temperature of calibrated plate should be equalized with the temperature of gauge block. The aim of the research conducted was to determine the time in which the temperature of lateral surface of gauge block is established.2 Methodology of conducted worksIn the works conducted, essential is the selection of method by which the temperature of lateral surface of the gauge block was recorded. In order to obtain a reliable distribution of temperature on the lateral surface of gauge blocked, a large number of measuring sensors should be placed. This would increase the thermal capacity of the entire system (calibrated plate and measuring sensors). Consequently, the time in which the temperature of plate with sensors placed would have reached the ambient temperature would differ from the time in which the plate without the sensors would have reached the ambient temperature. Impossibility to obtain appropriate thermal connections between the surface of gauge block and the surface of sensor should also be mentioned. In order to protect the plate from damage caused by the ef...

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Section: Discussionmentioning

confidence: 97%

Thermal imaging observations of the surface of a gauge block

Dziarski

2019

ITM Web Conf.

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“…[4,5] According to the accepted assumptions, this system should perform functions similar to the DCS system, but due to the program limitations it was impossible to complete all functions. The designed system was divided into the basic layers in which the following devices were assigned: • TIA Portal V13 software to the engineering layer; • two PLCs S7-1200 to the process layer; • the HMI KTP 700 Basic panel to the operator layer; • SCALANCE XB005 interface providing communication between all devices using Ethernet to the communication layer; • embedded in the controller digital and analog inputs and outputs, the accuracy of which has been determined while maintaining certain guidelines to the input and output layer [7][8][9]. Fig.…”

Section: Plc and Hmi Panel In A Distributed Control Systemmentioning

confidence: 99%

Distributed control system DCS using a PLC controller

2019

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The article presents The unconventional use of PLC controllers in a distributed control system DCS were presented in this article. The functionality, requirements and the costs of installation and operation of commercial DCS systems and those built on the basis of PLC logic controllers were analyzed. The features, the architecture and the structure of DCS systems based on PLC controllers have been described in details. The particular attention was paid to the allocation of the individual system components to the appropriate layers contained in their structure.

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“…Due to the dimensions of casings, the surfaces considered are small (of the order of square micrometres). Performing a measurement with a smaller error causes that the final measurement error of the entire measurement system is smaller [1,2]. The question is justified: will your thermal imaging camera allow obtaining a thermogram with a geometric resolution to sufficiently accurately determine the reliable temperature of the surface observed?…”

Section: Prefacementioning

confidence: 99%

Selection of the size of field of view in thermal imaging observations of small areas

2019

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The paper explains the effect of matrix resolution on the field of view of a single detector. The dependency of the field of view of a single detector as a function of distance between the lens of thermal imaging camera and the surface observed is shown. It was proposed how to select the lens of thermal imaging camera so that the obtained thermogram it would be able to achieve such a geometric resolution that would allow for sufficiently accurate mapping of temperature distribution on the surface observed.

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LabVIEW application for computer simulation of the conversion technique of dual-slope analog-to-digital converter

Cited by 11 publications

References 2 publications

Thermal imaging observations of the surface of a gauge block

Thermal imaging observations of the surface of a gauge block

Distributed control system DCS using a PLC controller

Selection of the size of field of view in thermal imaging observations of small areas

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