Dual-Wavelength Reflection Digital Holographic Microscopy Applied to the Detection of Pores in Coal Samples

Abstract

The detection of pores in coal samples using the multi-wavelength phase imaging digital holography is discussed and compared to software unwrapping.

Phase imaging of cells by simultaneous dual-wavelength reflection digital holography

“…It is based on two overlapping Michelson interferometers (one for each wavelength), which enables us to adjust the location of the firstorder components produced by each wavelength in the Fourier space (see below). The idea is similar to the setups based on the modified Mach-Zehnder configuration used previously [17][18][19][20][21], and the setups based on Michelson interferometer [22][23][24][25][26]. He-Ne (λ 1 =633 nm) and diode-pumped solid-state (λ 2 =532 nm) lasers were used as coherent light sources.…”