scholarly journals Исследование рефрактометром дифференциального типа влияния оптической плотности текущей жидкости на погрешность измерения показателя преломления

2020 ◽  
Vol 128 (9) ◽  
pp. 1303
Author(s):  
В.В. Давыдов ◽  
А.В. Мороз
Keyword(s):  
Refractive Index ◽  
Measurement Error ◽  
Optical Density ◽  
Measuring Error ◽  
Flowing Liquid ◽  
Flow Type ◽  
Differential Refractometer ◽  
Differential Flow ◽  
Compensation Technique ◽  
Shaped Glass

Factors that are affected the influence of the measurement error of the refractive index n in the flowing liquid (change in its optical density and temperature) are established. A during the using a differential flow type refractometer for measuring n flowing fliquid on the error in measuring the refractive index is additionally influenced by the scattering of radiation in the cell transducer and the wedge-shaped glass of the cell. New design of a differential refractometer for investigation of the optical density influence of the flowing liquid on the measurement error n is developped. New results confirming the influence of changes in the optical density of the flowing liquid on the measuring error of the refractive index n are recived. Compensation technique of the changes influence a optical density on the measurement error n is offered.

scholarly journals Condition monitoring of current media using a differential refractometer

2021 ◽  
Vol 2086 (1) ◽  
pp. 012135
Author(s):  
V I Svyatkina ◽  
V V Davydov ◽  
V Yu Rud
Keyword(s):  
Refractive Index ◽  
Laser Radiation ◽  
Condition Monitoring ◽  
Optical Density ◽  
New Method ◽  
Experimental Investigations ◽  
Refractive Index Measurement ◽  
Flowing Liquid ◽  
Index Measurement ◽  
Differential Flow

Abstract A new design of a differential flow refractometer has been developed to monitor the condition of flowing media in a pipeline. A new method of refractive index measurement has been implemented, taking into account the specifics of flowing and closed cuvette arrangement, as well as the angles of incidence of laser radiation on their walls. The effect of changes in the optical density in the flowing liquid on the refractive index measurement result is determined. The results of experimental investigations of different media are presented.

scholarly journals Lead-Wire-Resistance Compensation Technique Using a Single Zener Diode for Two-Wire Resistance Temperature Detectors (RTDs)

Sensors ◽  
2020 ◽  
Vol 20 (9) ◽  
pp. 2742
Author(s):  
Wei Li ◽  
Shusheng Xiong ◽  
Xiaojun Zhou
Keyword(s):  
Measurement Error ◽  
Measuring Error ◽  
Lead Wire ◽  
Remote Measurement ◽  
Zener Diode ◽  
Resistance Temperature Detector ◽  
Sensor Resistance ◽  
Temperature Detector ◽  
Compensation Technique ◽  
Wire Resistance

In remote measurement systems, the lead wire resistance of the resistance sensor will produce a large measurement error. In order to ensure the accuracy of remote measurement, a novel lead-wire-resistance compensation technique is proposed, which is suitable for a two-wire resistance temperature detector. By connecting a zener diode in parallel with the resistance temperature detector (RTD) and an interface circuit specially designed for it, the lead-wire-resistance value can be accurately measured by virtue of the constant voltage characteristic of the zener diode when reverse breakdown occurs, and compensation can thereby be made when calculating the resistance of RTD. Through simulation verification and practical circuit testing, when the sensor resistance is in 848–2120 Ω scope and the lead wire resistance is less than 50 Ω, the proposed technology can ensure the measuring error of the sensor resistance within ±1 Ω and the temperature measurement error within ±0.3 °C for RTDs performing 1000 Ω at 0 °C. Therefore, this method is able to accurately compensate the measurement error caused by the lead wire resistance in two-wire RTDsand is suitable for most applications.

scholarly journals On the need to control the state of the upper edge of the prism in a flow-through refractometer for measurements with an error less than 10−4

2021 ◽  
Vol 2086 (1) ◽  
pp. 012145
Author(s):  
F A Isakov ◽  
V V Davydov ◽  
V Yu Rud
Keyword(s):  
Thin Film ◽  
Refractive Index ◽  
Measurement Error ◽  
Technological Process ◽  
Experimental Studies ◽  
The State ◽  
Flowing Liquid ◽  
Upper Face ◽  
Flow Through ◽  
Negative Factors

Abstract The article substantiates the need to use a flow-through refractometer to control the state of a flowing liquid during scientific research, when automating a technological process, etc. The main negative factors that affect an increase in the measurement error of the refractive index n of a flowing liquid are determined. It was found that one of these factors is the formation of a thin film (plaque) on the upper face of the prism, which is in contact with the medium under study. The study of the influence of this film on the measurement error has been carried out. A method has been developed to eliminate plaque from the upper face of the prism during the operation of the refractometer. The results of experimental studies are presented.

scholarly journals The Analysis Of Accuracy Of Selected Methods Of Measuring The Thermal Resistance Of IGBTs

2015 ◽  
Vol 22 (3) ◽  
pp. 455-464 ◽  
Author(s):  
Krzysztof Górecki ◽  
Paweł Górecki
Keyword(s):  
Measurement Error ◽  
Thermal Resistance ◽  
Measurement Method ◽  
Bipolar Transistor ◽  
Operating Conditions ◽  
Measuring Error ◽  
Insulated Gate Bipolar Transistor ◽  
Theoretical Considerations

Abstract In the paper selected methods of measuring the thermal resistance of an IGBT (Insulated Gate Bipolar Transistor) are presented and the accuracy of these methods is analysed. The analysis of the measurement error is performed and operating conditions of the considered device, at which each measurement method assures the least measuring error, are pointed out. Theoretical considerations are illustrated with some results of measurements and calculations.

scholarly journals Новый метод измерения показателя преломления текущей жидкости

2021 ◽  
Vol 129 (7) ◽  
pp. 954
Author(s):  
В.В. Давыдов ◽  
А.В. Мороз ◽  
Д.И. Николаев
Keyword(s):  
Refractive Index ◽  
Laser Radiation ◽  
Vertical Section ◽  
Experimental Studies ◽  
New Method ◽  
Practical Implementation ◽  
Multiple Reflections ◽  
Optical Elements ◽  
Flowing Liquid ◽  
Flow Through

The necessity of developing a new method for measuring the refractive index of a liquid in a turbulent mode of its flow in a pipeline is substantiated. A new method for measuring the refractive index of a medium n is presented. For its practical implementation, a new design of a flow-through refractometer has been developed, which makes it possible to measure n in both laminar and turbulent fluid flow. A new design of the optical part of the refractometer is considered. A new way of placing it on the vertical section of the pipeline for measuring n is proposed. All this makes it possible to make insignificant the influence on the measurement result of n flowing liquid of errors associated with multiple reflections of laser radiation from optical elements, with the formation of voids or vortex flows in the pipeline and with temperature fluctuations. In the design of a refractometer with a new method for measuring n, there are no restrictions on determining the value of n of a flowing liquid, in contrast to the used industrial flow-through refractometers, the principle of which is based on the phenomenon of total internal reflection of laser radiation at the interface of two media. The results of experimental studies of various media are presented.

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