THE OBJECTIVE OF THIS EFFORT IS TO DEVELOP AND EXAMINE THE THEORETICAL BASIS FOR IN SITU PARTICLE SIZING WITH A LASER DOPPLER VELOCIMETER-LDV OPTICAL SYSTEM.

THE OBJECTIVE OF THIS EFFORT IS TO DEVELOP AND EXAMINE THE THEORETICAL BASIS FOR IN SITU PARTICLE SIZING WITH A LASER DOPPLER VELOCIMETER-LDV OPTICAL SYSTEM. THE INNOVATION OF THE PROPOSED APPROACH IS THE SIMULTANEOUS MEASUREMENT OF FOUR DIFFERENT LDV SIGNAL CHARACTERISTICS TO OBTAIN SIMULTANEOUSLY AND IN SITU, PARTICLE SIZE DISTRIBUTIONS, PARTICLE NUMBER DENSITIES AND PARTICLE VELOCITIES, FOR PARTICLES IN THE SIZE RANGE 0.25 TO 10 M. THE ANALYSIS WILL DEFINE WAYS TO IMPROVE A PARTICLE SIZING INTERFEROMETER(PSI) - WHICH USES THE LDV OPTICAL SYSTEM AND MAY USE ONE ORMORE BEAMS OF THE LDV - TO MEASURE ACCURATELY AND SIMULTANEOUSLY, PARTICLE SIZE DISTRIBUTIONS, NUMBER DENSITIES AND VELOCITIES. IMPROVEMENT OF THE PSI WILL FOCUSON SIMULTANEOUSLY DETERMINING PARTICLE SIZE USING FOUR INDEPENDENT, SYNCHORNIZED MEASUREMENTS OF THE LDV SIGNAL. COMPARISON OF THE RESULTING PARTICLE SIZE DISTRIBUTIONS FROMTHESE FOUR METHODS WILL ENABLE TIGHTER TOLERANCES TO BE SPECIFIED ON THE MEASURED SIZE DISTRIBUTIONS. THE ANALYSIS WILL ALSO BE UTILIZED TO: (1) DETERMINE MEASUREMENT VOLUME NORMALIZATION WEIGHTING FACTORS, (2) DETERMINE EFFECTS OF PARTICLE INDEX REFRACTION VARIATIONS, (3) DEVELOP A NEW INVERSION SCHEME WHICH WILL DEFINE ACTUAL SIZE DISTRIBUTIONSFROM MEASURED DISTRIBUTIONS, AND (4) IDENTIFY SIZE AND SCATTERING CROSS SECTION.