Axial-resolution in depth from focus digital holography

We use digital holography to quantify surface topography of rough objects in full-field. We calculate the variance of the intensity image as a focus metric over a set of reconstruction distances for each pixel, which results in a focus metric curve. The distance where the variance peaks is an estimate for the depth. First we analyze the lateral...

Digital holographic particle image velocimetry

This thesis contributes to the development of an instrument that can measure fluid flow velocity in a three-dimensional (3D) measurement domain by holographic imaging.

Holographic wavefield imaging for surface reconstruction and 3d tomography

Optical imaging is the imaging of objects with visible light. It is a tool often used for diagnostic purposes, such as in biomedical and material sciences. Digital holography is an optical imaging technique that captures and images the amplitude as well as the phase (the complex amplitude) of the lightwave. An advantage is that the complex...

Application of digital holography to filament size analysis

The potential of in-line digital holography to locate and measure the size and position of filaments, i.e. thin wire-like objects, distributed throughout a thick volume has been investigated. In this paper two approaches are introduced to study filaments of varying diameter. (1) It is shown analytically and experimentally that for a gradual...

Digital holographic particle image velocimetry: Eliminating a sign-ambiguity error and a bias error from the measured particle field displacement

Optimizing Fourier filtering for digital holographic particle image velocimetry

Lensless coherent imaging by sampling of the optical field with digital micromirror device

We have experimentally demonstrated a lensless coherent microscope based on direct registration of the complex optical field by sampling the pupil with a sequence of two-point interferometers formed by a digital micromirror device. Complete registration of the complex amplitude in the pupil of the imaging system, without any reference beam,...

Towards a single shot holographic diagnosis of Schistosomiasis haematobium

Large scale, highly sensitive and specific diagnostic tools are needed to eliminate the transmission of schistosomiasis. This report expands upon the novel approach from M. Hoeboer and P.M. Nijman. Their Smart Optical Diagnostic Of Schistosomiasis device (SODOS), combining the principles of flow cytometry and digital holography, was able to...

The Smart Optical Diagnostic of Schistosomiasis

Urinary schistosomiasis is with over 110 million infected people one of the most common parasitic infections worldwide, most commonly found in Sub-Saharan Africa. Urinary schistosomiasis is caused by the Schistosoma Haematobium (SH) parasite. The most common diagnostic method is manual microscopy, in which urine is manually examined to see...

Digital holography integrated with flow cytometry for detection of urinary schistosomiasis

Schistosomiasis is an intravascular infection with major public health consequences in developing countries. It is one of the major Neglected Tropical Diseases with more than 240 million people infected and 800 million people at risk in 2015, mostly in sub-Saharan Africa. It is caused by trematode parasites of the genus Schistosoma, in this...