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Other Titles: Підвищення точності оптико-абсорбційного вимірювача концентрації вугільного пилу.
Improving the accuracy of optical absorption of coal dust concentration meter.
Authors: Р.И. Соломичев, R.I. Solomichev
А.В. Вовна, A.V. Vovna
А.А. Зори, А.А. Zori
Keywords: концентрация
measuring instrument
Issue Date: May-2015
Publisher: Донецький національний технічний університет
Citation: Наукові праці Донецького національного технічного університету. Серія: Обчислювальна техніка та автоматизація. Випуск 1 (28). - Красноармійськ, ДонНТУ, 2015.
Series/Report no.: Наукові праці Донецького національного технічного університету. Серія: Обчислювальна техніка та автоматизація. Випуск 1 (28). - Красноармійськ, ДонНТУ, 2015. - C. 171-180.;
Abstract: Проведенные лабораторные испытания макетного образца измерителя концентрации и дисперсности угольной пыли без температурной компенсации позволили установить существенный температурный дрейф его выходного напряжения в диапазоне изменения температуры от +16 до +40 °С. Усовершенствован способ компенсации температурного дрейфа нуля двулучевого измерителя концентрации и дисперсности угольной пыли, получена оценка его метрологических характеристик, подтверждающая существенное повышение точности измерений: для первого канала в 1.9, а для второго в 6.7 раза в диапазоне измерения концентрации от 0 до 3 г/м3.
Description: Existing aspiration samplers do not satisfy to modern standards and control requirements of coal mines haze in speed, accuracy and ability to measure automatically. In contrast to single-beam method in which it is impossible to assess the current dust aerosol dispersion, through the two-beam method determining the nature of radiation attenuation for a particular wavelength of a certain particle size causes obtaining experimental data for restoring the function of particle size distribution, as well as the determination of the suspended dust mass concentration. However, devoid of such deficiencies the optical absorption method for measuring the concentration of suspended dust particles has a significant temperature dependence of the LED emission intensity at a constant amplitude voltage that causes the dominant contribution to the dust measurement error, along with significant destabilizing factors such as sight glasses dustiness and humidity of mine air. The laboratory tests of the two-beam model sample coal dust concentration and dispersion meter were provided without zero temperature drift compensation. The experimentally obtained characteristics were investigated of the output voltage normalizing converters, the additional absolute error of dust concentration measurement caused by temperature drift was established, which make up for the first channel (the wavelength λ1 = 470 nm) ± 25 mg/m3; for the second channel (λ2 = 624 nm) ± 76.6 mg/m3 in the temperature range of +16 to +40 °C, which does not satisfy the set requirements for accuracy. In order to ensure the required accuracy temperature compensation method was improved, which was developed on the basis of a two-beam model sample of coal dust concentration and dispersion meter, which has significantly improved light-emitting diodes thermal instability compensation. To provide the LEDs thermal instability compensation we suggest to enter in the measuring instrument scheme the closed channel with additional temperature compensation, and for measuring instrument realization with extended functional capabilities – the dust dispersion determining, it is proposed to combine the open optical channel of two measuring cells with different wavelengths radiation in one. The additional absolute errors of dust concentration measurement was established in this case for the first channel were ± 13 mg/m3; for the second channel ± 11.3 mg/m3, respectively by 1.9 and 6.7 times less than the two-beam dust concentration measuring instrument without temperature compensation in the concentration measurement range from 0 to 3 g/m3.
ISSN: 2075-4272
Appears in Collections:Випуск 1(28)

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