Measurement of gradient index profiles by Babinet fringe analysis.
A theory for determining one-dimensional ray deflections with the help of distorted Babinet fringes has been developed. An approach for investigating two-dimensional ray deflections has been presented. Applications of the techniques for the study of gradient index glass have been described.
The Formation of Fringes in a Babinet Compensator
Details are given of the appearance of the field of view when two wedges of doubly refracting material are placed in arbitrary azimuths between crossed polarizing devices. In general the field of view presents a complex pattern but simple fringe systems appear for suitable orientation of the wedges, one of which is the well-known Babinet fringe system. Theoretical relationships are derived for the intensity distribution in the general case and for the simple cases. Photographs show how the simple fringe systems are formed out of the complex cases. A use of the patterns for detecting if the wedges of a Babinet compensator are correctly mounted is mentioned.
Single drop mass transfer augmented by interfacial instability
Abstract A photographic technique was used to determine mass transfer rates from single drops immediately following formation. Measurements were made on a system expected to exhibit interfacial tension driven convection and comparisons are drawn to predictions for stable systems and to measurements in the presence of surfactant. Unusually high mass transfer coefficients are reported.