Depth-of-focus reduction for digital in-line holography of particle fields

Authors

Weidong Yang, Michigan Technological University
A. B. Kostinski, Michigan Technological UniversityFollow
Raymond Shaw, Michigan Technological UniversityFollow

Document Type

Article

Publication Date

6-1-2005

Abstract

Poor axial precision caused, in part, by large depth of focus (ꞇ) has been a vexing problem in extraction of particle position from digital in-line holograms. A simple method is proposed to combat this depth-of-focus difficulty. The method is based on decoupling of size and position information. With d , ∆, and λ being particle diameter, CCD pixel size, and the wavelength, respectively, our main theoretical result is the reduction of ꞇ from ꞇ ~ d² / λ to ꞇ ~ ∆² / λ for particles of known size. This result is confirmed in laboratory experiments with holograms of calibrated glass spheres.

Publisher's Statement

© 2005 Optical Society of America. Publisher’s version of record: https://doi.org/10.1364/OL.30.001303

Publication Title

Optics Letters

Recommended Citation

Yang, W., Kostinski, A. B., & Shaw, R. (2005). Depth-of-focus reduction for digital in-line holography of particle fields. Optics Letters, 30(11), 1303-1305. http://doi.org/10.1364/OL.30.001303
Retrieved from: https://digitalcommons.mtu.edu/physics-fp/226