Features of measuring the brightness of the screens

O. Kupko
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Abstract

The situation with the metrological assurance of brightness measurements in Ukraine is analyzed. The main regulatory documents for the characterization of lux meters are considered. It was noted, that the components of the uncertainty of brightness due to the difference in the spectral composition of radiation, during calibration and measurement, as well as uncertainties due to spatial heterogeneity of the screens, are not fully considered. The characteristic values of these uncertainties are calculated by the method of mathematical modeling, using generally accepted calculation methods. To calculate the spectral errors, the literature data on the spectra of CCFL and LED monitors were used, as well as the modeling of the spectra of blue, green and red radiation sources, using Gaussian distribution with varying widths. It is shown, that for а brightness meter calibrated by а type A source, the use of white screens for measuring the brightness will result in errors, less than 7%. It is shown, that when calibrating the brightness meter using the CCFL screen and then using the LED for the screen, the errors will be about 1%. Simple formulas are given to evaluate the effect of screen heterogeneity. For а refined assessment of the influence of spatial inhomogeneity, mathematical modeling was carried out — 3 types of brightness distribution, were used with decreasing radiation distribution density and two types of viewing area — а circle (imitation of brightness measurement, using а diaphragm) and а Gaussian distribution (imitation of brightness measurement with а lens) equal widths. It is shown, that for the field of sight in the form of а Gaussian distribution, the influence of the inhomogeneity of the distribution of screen illumination, when moving and changing the width of the field of sight is insignificant. Two approaches have been proposed for building the material base for metrological assurance of brightness measurements.
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测量屏幕亮度的功能
分析了乌克兰亮度测量的计量保证情况。考虑了用于表征照度计的主要监管文件。有人指出,在校准和测量过程中,由于辐射光谱组成的差异而导致的亮度不确定度的分量,以及由于屏幕的空间异质性而导致的不确定度,都没有得到充分考虑。这些不确定性的特征值是通过数学建模的方法,使用公认的计算方法来计算的。为了计算光谱误差,使用了关于CCFL和LED监视器光谱的文献数据,以及使用不同宽度的高斯分布对蓝色、绿色和红色辐射源的光谱进行建模。结果表明,对于用A型光源校准的亮度计,使用白色屏幕测量亮度会产生小于7%的误差。结果表明,当使用CCFL屏幕校准亮度计,然后使用LED进行屏幕校准时,误差约为1%。给出了评价屏幕异质性影响的简单公式。为了精确评估空间不均匀性的影响,进行了数学建模——3种类型的亮度分布,在辐射分布密度降低的情况下使用,并且两种类型的观看区域——а圆形(使用а光圈模拟亮度测量)和а高斯分布(使用а。结果表明,对于а高斯分布形式的视场,当移动和改变视场宽度时,屏幕照明分布的不均匀性的影响是微不足道的。提出了两种方法来建立亮度测量的计量保证材料基础。
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