Digital image holography

Popular methods for mutual diffusion measurements in fluid systems are the Taylor dispersion method and interferometric methods, such as Digital Image Holography [13, 14]. 

Self-diffusion coefficients were measured with the NMR spin-echo method and mutual diffusion coefficients by digital image holography. As can be seen from Figure 4.4-3, the diffusion coefficients show the whole bandwidth of diffusion coeffi-... 

Self-difFusion coefficients were measured with the NMR spin-echo method and mutual diffusion coefficients by digital image holography. As can be seen from Figure 4.4-3, the diffusion coefficients show the whole bandwidth of diffusion coefficient values, from 10 m s on the methanol-rich side, down to 10 on the [BMIM][PFg]-rich side. The concentration dependence of the diffusion coefficients on the methanol-rich side is extreme, and shows that special care and attention should be paid in the dimensioning of chemical processes with ionic Hquids. 

Diggers, R., ed. 2003. Encyclopedia of Optical Engineering. New York Dekker. This three-volume set provides comprehensive coverage of the topic including digital image enhancement, holography, radiometry, and lasers in medicine. 

Being intrinsically a 3D imaging technique, digital holography offers a great scope for solving... 

In digital holography, information capacity is mainly limited by two parameters (i) presence of speckle noise in the reconstruction images and (ii) size of CCD sensor. The influence of these two parameters on information capacity is discussed in the following subsections. 

Fig. 1 Intensity variation along the depth (z) of reconstructed volume near the in-focus position (z ,i ) of a particle (diameter = dp) image reconstructed using lensiess digital holography and digital holographic microscopy...

The velocity field of fluid flow can be obtained by using either particle tracking velocimetry (PTV) or particle image velocimetry (PIV) approach. The PTV approach is most suitable when the particle concentration in the fluid is low. The PIV approach is used when the particle concentration is high. It is primarily based on the cross correlation between images acquired at two different time instances. Because digital holography... 

OPTICAL INTERFEROMETRY comprises a range of techniques that use light waves to make extremely accurate measurements. For many years optical interferometry remained a laboratory technique. However, as a result of several recent innovations such as lasers, optical fibers, holography, and the use of digital computers for image processing, optical interferometiy has emerged as a very practical tool with many applications. 

---