Exhaust Emissions from In-Use General Aviation Aircraft (2016) / Chapter Skim
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70 PM Measurement Instruments The particle measurement instruments used during this research are listed in Table H-1 and include a MAAP (Model 5012, Thermo Scientific) , a CAPS-based particle extinction monitor (PMex)
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PM Measurement Instruments 71 The CAPS technique, similar in nature to cavity ring-down spectroscopy, relies on the use of a sample cell employing high reflectivity mirrors. In this particular application, square-wave modulated red light (~635 nm)
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72 Exhaust Emissions from In-Use General Aviation Aircraft spectro meter operates at 10 L/min, which greatly reduces particle sampling losses due to diffusion. Additionally, it operates at ambient pressure to eliminate any concern about evaporating volatile and semi-volatile particles.
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