Opacity Monitor Quarterly report - Iowa Department of Natural 2025

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Opacity Monitoring Systems (COMS) involve the installation of monitoring equipment which accumulates data on a pre-determined time schedule in a stack or duct. Many of the principles of stack testing also apply to continuous monitoring systems.
Opacity is measured directly by the contrast ratio formula. A visual representation of this formula would be a paint, coating, or paper sample of color that is measured against both a true black and true white sample background, and quantified ing to the CIE Y (luminance or brightness) value system.
Smoke and smoke opacity meters are instruments measuring the optical properties of diesel exhaust. These instruments have been designed to quantify the visible black smoke emission utilizing such physical phenomena as the extinction of a light beam by scattering and absorption.
It measures the amount of light, which is lost in crossing the stack, relative to the baseline measured when no PM is present. A clear stack with no PM has zero per cent opacity and a completely obscured beam has an opacity of 100 per cent. In practice, most modern processes have opacity values well below 10 per cent.
Smoke opacity meters calculate the optical properties of diesel smoke with an indirect method of calculating diesel particulate emissions. The fraction of light lost in passing the stack is measured by opacity, which is a measure of light attenuation.
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