Abstract
This chapter introduces the method of digital in-line holography (DIH) for the purpose of characterizing aerosol particles through their images. The central advantage of imaging particle with DIH compared to conventional imaging, for example, microscopy, is that images of particles at different positions may be brought into focus without repeating the hologram measurement. Useful information such as the number of particles and the particle size and shape can be obtained without the need to collect or otherwise trap particles. We examine the theoretical foundation of DIH, explain how images are generated from a hologram, and consider several limitations that are imposed by hardware.
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