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Title of Journal: Appl Phys B

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Abbravation: Applied Physics B

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Springer-Verlag

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DOI

10.1016/0148-2963(85)90033-5

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1432-0649

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Midinfrared laserabsorption diagnostic for vapor

Authors: J M Porter J B Jeffries R K Hanson
Publish Date: 2009/07/25
Volume: 97, Issue: 1, Pages: 215-225
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Abstract

A novel threewavelength midinfrared laserbased absorption/extinction diagnostic has been developed for simultaneous measurement of temperature and vaporphase mole fraction in an evaporating hydrocarbon fuel aerosol vapor and liquid droplets The measurement technique was demonstrated for an ndecane aerosol with D 50∼3 μ m in steady and shockheated flows with a measurement bandwidth of 125 kHz Laser wavelengths were selected from FTIR measurements of the C–H stretching band of vapor and liquid ndecane near 34 μm 3000 cm −1 and from modeled light scattering from droplets Measurements were made for vapor mole fractions below 23 percent with errors less than 10 percent and simultaneous temperature measurements over the range 300 KT900 K were made with errors less than 3 percent The measurement technique is designed to provide accurate values of temperature and vapor mole fraction in evaporating polydispersed aerosols with small mean diameters D 5010 μ m where nearinfrared laserbased scattering corrections are prone to error

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