Laser holography

WG Gorman, FA Carroll. Aerosol particle-size determination using laser holography. Pharm Technol 17 34-37, 1993. 

A visualization study of fuel atomization using a pulsed laser holography/photography technique indicates that basic spray formation processes are the same for both a coal-derived synthetic fuel (SRC-II) and comparable petroleum fuels (No. 2 and No. 6 grade). Measurements were made on both pressure swirl and air assisted atomizers in a cold spray facility having well controlled fuel temperature. Quality of the sprays formed with SRC-II was between that of the No. 2 and No. 6 fuel sprays and was consistent with measured fuel viscosity. Sauter mean droplet diameter (SMD) was found to correlate with fuel viscosity, atomization pressure, and fuel flow rate. For all three fuels, a smaller SMD could be obtained with the air assisted than with the pressure swirl atomizer. 

Pulsed laser holography and photography provide a powerful technique for the instantaneous visualization of spray processes. 

Which of these techniques are most likely, in my estimation, to be applicable to ceramic matrix composites Ultrasonics or acoustic emission evaluation techniques are adaptable for high temperatures if high temperature coupling materials can be used. The other techniques do not appear to be immediately applicable, even to monolithic ceramics. Laser holography has been shown to be useful in determining displacements and deflections in turbine airfoils.28 For experimental laboratory setups, the use of such equipment is relatively direct but the most likely drawback for in-service conditions is the size and placement of lasers and detectors compared to the available space and design. Some creative engineering will be required here in order to utilize these kinds of techniques. 

R. J. Pryputniewicz, Laser Holography, Worcester Polytechnic Institute, MA, January 1979. 

LiNbOj Piezoelectric electrooptic Optical memory displays acoustic devices wave guides lasers holography... 

F. Mayinger and A. Chavez, Measurement of Direct Contact Condensation of Pure Saturated Vapor on an Injection Spray by Applying Pulsed Laser Holography, Int. J. Heat Mass Trans., 35, pp. 691-702,1992. 

Sydney, 10-14th Oct.1988, Vol.2, Paper 3, pp.l3. 012 LASER HOLOGRAPHY FOR INSPECTION OF TYRE... 

Laser Associates Ltd, Paynes Lane, Warwickshire, UK Laser Holography Inc., 1130 Channel Drive, Santa Barbara, CA 93130, USA Laser Lines Ltd, Beaument Close, Banbury, Oxon. 0X16 7TQ, UK, (01295) 67755... 

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