ABSTRACT
This chapter emphasizes methods for measuring drop size and spray pattern, it touches on measurement of some of these other characteristics of the spray. Though the size of droplets within a spray remains a critical characteristic of a spray, other parameters can be, and are, measured regularly. The problem of measuring the size of very small particles is encountered in many branches of engineering science, and many different methods have been employed with varying degrees of success. As the lifetime of small drops is extremely short, evaporation effect is very important in the measurement of fine sprays. While the basic method proved quite robust, a number of user-controlled settings and their management yielded inherent sensitivities in the measured results. In addition to interferometric techniques, single-particle counting can also be accomplished by measuring the absolute intensity of light scattered by particles traversing a single focused laser beam.
