Development of a calibration system for a laser-based particle analyzing system designed to measure nonspherical particles

Stefan R. Martin

doi:10.1117/12.279743

21 November 1997 Development of a calibration system for a laser-based particle analyzing system designed to measure nonspherical particles

Stefan R. Martin

Author Affiliations +

Proceedings Volume 3172, Optical Technology in Fluid, Thermal, and Combustion Flow III; (1997) https://doi.org/10.1117/12.279743
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

The application of a laser Doppler velocimeter to size measurements of non-spherical particles is discussed in terms of the light scattering properties of spherical particles. The necessary modifications to the probe volume shape and the receiver optics to enable reliable intensity measurements are described. Various approximations must be made to allow size measurements, and the particles should not be too irregular in shape. An exact knowledge of the refractive index of the material to be measured is not necessary, since the technique is sensitive to diffracted light. The development of a rapid and reliable calibration method relying on a combination of Mie-Lorenz and Fraunhofer diffraction theory is described. Finally, some experimental data obtained from cornstarch is compared with measurements of the same material taken from an electron micrograph. These data were in good agreement.

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Stefan R. Martin "Development of a calibration system for a laser-based particle analyzing system designed to measure nonspherical particles", Proc. SPIE 3172, Optical Technology in Fluid, Thermal, and Combustion Flow III, (21 November 1997); https://doi.org/10.1117/12.279743

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