title: Method of phase-Doppler anemometry free from the measurement-volume effect.
abstract: A novel method is developed to improve the accuracy of particle sizing in laser phase-Doppler anemometry (PDA). In this method the vector sum of refractive and reflective rays is taken into consideration in describing a dual-mechanism-scattering model caused by a nonuniformly illuminated PDA measurement volume. The constraint of the single-mechanism-scattering model in the conventional PDA is removed. As a result the error caused by the measurement-volume effect, which consists of a Gaussian-beam defect and a slit effect, can be eliminated. This new method can be easily implemented with minimal modification of the conventional PDA system. The results of simulation based on the generalized Lorenz-Mie theory show that the new method can provide a PDA system free from the measurement-volume effect.
authors.affiliation: Department of Mechanical Engineering, Hong Kong University of Science and Technology, Kowloon, Hong Kong.
authors.forename: H
authors.initials: H
authors.lastname: Qiu
authors.forename: C T
authors.initials: CT
authors.lastname: Hsu