Abstract
Laser holography offers an accurate means of measuring the size, concentration and velocity of fine particles suspended in gas streams and therefore has a novel potential use in studies of hot fuel gas cleaning methods. A theoretical analysis of holographic image resolution principles was carried out in order to apply the technique to examination of particles emanating from a coal gasifier. Laboratory bench tests using an in-line system show that fine particles down to 2 μm in a simulated off-gas line can be recorded for analysis. The effect of a hot gas environment on background noise and size resolution is also discussed. Some results of the hot gas tests are presented and compared with results obtained using a laboratory particle sizer on samples collected isokinetically. Size distributions measured holographically show good agreement with laboratory results.
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