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Device and method for determining the particle size distribution and of the total concentration of particles in a sample gas stream
Device and method for determining the particle size distribution and of the total concentration of particles in a sample gas stream
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机译:用于确定样品气流中的粒度分布和总颗粒浓度的装置和方法
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摘要
Light source (24) intensity can be controlled. An Independent claim is included for the corresponding method of measurement. Dispersed light is evaluated to determine the particle numbers. Illumination with light of differing intensity is used to measure differing bands of particle size. Preferred Features: Two or more sources are included, of differing intensity. The gas flow is illuminated with a succession of controlled (28) pulses of alternating intensity. A single, variable-intensity source can be employed, controlled to similar effect. The source produces white light. Laser(s) are employed. Short pulses of high intensity are alternated with lower intensity light, respective durations being 1 and 2 seconds. In external operation wavelength is 670-680 nm, in moisture-sensing operation it is 320-780 nm. A dryer is connected in the recycle line, following the measurement cell.
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