Two optical pattern recognition methods for characterizing spherical and nonspherical aerosols and particulates are presented. The overall objective of size distribution determination in nearly real time under conditions of high particulate loading is specified. A holographic version of the commercially available wedge-ring detector is described to replace the classical matched filter and some of the possible benefits are enumerated. Computer simulations utilizing the classical matched filter and the holographic ring detector and experimental data collected for opaque spherical particles are included.
Martin S. Marshall,
Robert E. Benner,
"Sizing opaque spherical particles using classical matched filters and holographic ring detectors," Optical Engineering 31(5), (1 May 1992). http://dx.doi.org/10.1117/12.56161