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Shadow Doppler technique for sizing particles of arbitrary shape

Authors :
Hardalupas, Y.
Hishida, K.
Maeda, M.
Morikita, H.
Taylor, A.M.K.P.
Whitelaw, J.H.
Source :
Applied Optics. Dec 20, 1994, Vol. 33 Issue 36, p8417, 10 p.
Publication Year :
1994

Abstract

The output from a linear diode array is used in a modified laser Doppler velocimeter to measure the size and shape of irregular particles. The sizing accuracy for transparent and opaque particles between 30 and 140 [[micro]meter] is better than 10%. The inaccuracy caused by trajectories that lay at angles of less than 24 [degrees] to the axis of the array was less than +5%, and a further inaccuracy of [+ or -]5% was caused by defocusing of the particle from the center of the velocimeter measuring volume by up to [+ or -]500 [[micro]meter] . The advantages of the shadow Doppler technique over other techniques for sizing irregular particles, such as amplitude systems with pointer volumes, are that the shadow Doppler technique records shape, the optical arrangement is more robust, less precise alignment is required, and the equipment can be constructed at low cost. Key words: Irregular particle sizing, laser Doppler velocimetry, particle imaging.

Details

ISSN :
1559128X
Volume :
33
Issue :
36
Database :
Gale General OneFile
Journal :
Applied Optics
Publication Type :
Academic Journal
Accession number :
edsgcl.16582071