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DTIC ADA495860: Evaluation of Digital Optical Method To Determine P... |
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by Defense Technical Information Center |
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United States Environmental Protection Agency (USEPA) set |
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opacity standards for visual emissions from industrial |
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sources to protect ambient air quality. USEPA developed |
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Method 9, which is a reference method to describe how |
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plume opacity can be quantified by human observers during |
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daytime conditions. However, it would be beneficial to |
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determine plume opacity with digital still cameras (DSCs) |
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to provide graphical records of the plume and its |
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environment during visual emission evaluation and to be |
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able to determine plume opacity with DSCs during |
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nighttime conditions. Digital optical method (DOM) was |
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developed to quantify plume opacity from photographs that |
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were provided by a DSC during daytime. Past daytime field |
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campaigns have demonstrated that DOM provided opacity |
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readings that met Method 9 certification requirements. In |
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this paper, the principles and methodology of DOM to |
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quantify plume opacity during nighttime are described. |
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Also, results are described from a nighttime field |
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campaign that occurred at Springfield, IL. Opacity |
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readings provided by DOM were compared with the opacity |
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values obtained with the reference in-stack |
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transmissometer of the smoke generator. The average |
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opacity errors were 2.3-3.5% for contrast model of DOM |
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for all levels of plume opacity. The average opacity |
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errors were 2.0-7.6% for the transmission model of DOM |
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for plumes with opacity 0-50%. These results are |
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encouraging and indicate that DOM has the potential to |
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quantify plume opacity during nighttime. |
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Date Published: 2018-07-11 23:55:46 |
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Identifier: DTIC_ADA495860 |
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Item Size: 8475302 |
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Language: english |
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Media Type: texts |
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# Topics |
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DTIC Archive; Du, Ke; ILLINOIS UNIV A... |
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