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Wybrane aspekty wzorcowania pirometrów i kamer termowizyjnych

Bakoń Tomasz, Roman Witkowski

Elektro Info

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2020

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nr 10

72--74

PL

W artykule przedstawiono praktyczne wskazówki dotyczące wzorcowania pirometrów i kamer termowizyjnych. Uwagi poprzedzone zostały krótkim wstępem teoretycznym dotyczącym podstaw działania termometrów radiacyjnych oraz podstawowymi informacjami o przyrządach pomiarowych do zdalnego pomiaru temperatury.

EN

This article presents practical guidelines for calibrating of pyrometers and infrared cameras. Remarks were preceded by short theoretical introduction regarding the basics of radiation thermometers and basic information about measuring instruments for remote temperature measurement.

2

The infrared transmittance model for in-situ monitoring of diamond on quartz deposition process

Kulesza S.

Optica Applicata

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2012

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Vol. 42, nr 3

533-543

EN

A model of the optical transmittance of a diamond/quartz/vacuum system in the infrared range is presented in the paper. The model relies on the attenuation of unpolarized light emitted by the substrate, the intensity of which is subsequently measured by the pyrometer at two close wavelengths. Changes in the film thickness give rise to the phase shift between the waves, which in turn influences the apparent temperature measured by the pyrometer. Periodic variation of the apparent temperature is therefore modeled in order to extract the changes in the film thickness and surface roughness. Another question discussed within the frame of the model is the true temperature estimation in the case of samples with the roughest surfaces.

3

Pyrometric method of temperature measurement with compensation for solar radiation

Madura H., Kastek M., Sosnowski T., Orżanowski T.

Metrology and Measurement Systems

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2010

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Vol. 17, nr 1

77-86

EN

Outdoor remote temperature measurements in the infrared range can be very inaccurate because of the influence of solar radiation reflected from a measured object. In case of strong directional reflection towards a measuring device, the error rate can easily reach hundreds per cent as the reflected signal adds to the thermal emission of an object. As a result, the measured temperature is much higher than the real one. Error rate depends mainly on the emissivity of an object and intensity of solar radiation. The position of the measuring device with reference to an object and the Sun is also important. The method of compensation of such undesirable influence of solar radiation will be presented. It is based on simultaneous measurements in two different spectral bands, short-wavelength and long-wavelength ones. The temperature of an object is derived from long-wavelength data only, whereas the short-wavelength band, the corrective one, is used to estimate the solar radiation level. Both bands were selected to achieve proportional changes of the output signal due to solar radiation. Knowing the relation between emissivity and solar radiation levels in both spectral bands, it is possible to reduce the measurement error several times.

4

Application of laser diodes and photodetectors on multiple-quantum wells at the hot-metal pyrometry

Sen'kov A. G., Firago V. A., Kononenko V. K., Christol P.

Pomiary Automatyka Kontrola

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2007

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R. 53, nr 9 bis

597--600

EN

In the paper, the method of relative spectroreflectometry at using the infrared photodetectors with a wide diapason of the spectral photosensitivity is suggested. Methodical errors at exponential and power dependencies of the emissivity of an object on the wavelength are analysed. Possible design of a pyrometer for measurements of temperature of hot metals is described and attractiveness of quantum-well laser diodes and superlattice photodetectors based on the GaSb compounds is discussed.

PL

W pracy zaproponowano metodę spektrofotometrii porównawczej z wykorzystaniem fotodetektorów podczerwieni o szerokim zakresie czułości spektralnej. Określono błędy systematyczne związane z wykładniczą i kątową zależnością od długości fali i współczynnika emisyjności obiektów. Przedstawiono jedną z możliwych konstrukcji pirometru do pomiaru rozgrzanych metali. Dyskutuje się również możliwość zastosowania diod laserowych o rozmiarach kwantowych oraz fotodetektorów zbudowanych w oparciu o złącza GaSb.

5

Możliwość zastosowania fotografii cyfrowej do pomiaru temperatury w metalurgii

Trejderowski T., Przyłucki R., Cymerman G.

Hutnik, Wiadomości Hutnicze

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2006

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Vol. 73, nr 3

115-121

PL

Niniejszy artykuł zawiera charakterystykę wybranych metod pomiaru temperatury, stosowanych obecnie w procesach metalurgicznych. Na ich tle zaprezentowano możliwość zastosowania do tego celu nowej metody z wykorzystaniem fotografii cyfrowej. jest to metoda nie stosowana dotąd na skalę przemysłową. W artykule przedstawiono najważniejsze aspekty techniczne zastosowania fotografii cyfrowej do pomiaru temperatur w przemyśle hutniczym. Artykuł opisuje wady i zalety stosowania fotopirometrii cyfrowej w pomiarach temperatur oraz analizę opłacalności wprowadzenia takiego rozwiązania w miejsce obecnie stosowanych.

EN

This article contains characteristic of selected methods of temperature measuring used at present in metallurgical processes. On this background a new method of using digital photography for his purpose has been presented. This method have not been used before in industrial scale. The paper presents most important technical facts of using digital photography for temperature measuring in metallurgical furnaces. Defects and advantages of using digital photopyrometry for temperature measuring are described and profitability of introducing this kind of solution instead of present applied is analysed.

6

Influence of sun radiation on results of non-contact temperature measurements in far infrared range

Madura H., Kołodziejczyk M.

Opto-Electronics Review

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2005

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Vol. 13, No. 3

253-257

EN

Non-contact measurements of an object temperature in IR range carried out in outdoor conditions can suffer from significant errors. An error of temperature measurement can be very high when sun radiation after reflection from an object propagates along optical axis of a measuring device (thermovision camera, pyrometer). Radiation beams reflected from an object and objectís radiation itself are added and a final value of temperature is higher. The paper presents results of theoretical estimations of errors of temperature measurement and their comparison with experimental results. Calculations and measurements were made for objects of various emissivities in a spectral range of 8-9 µm.