Quantitative visualization of large variation phase objects

This paper describes a technique by which a large variation phase object may be visualized in an image having an irradiance which is directly proportional to the object phase. An image of the phase object derivative is formed in a coherent optical system and recorded on photographic film. This photograph is used as the input to a second coherent optical system, in which the image is an integral of the input. No limitations are imposed on the maximum object phase, only on its maximum slope. Experimental techniques for implementation of this system are discussed and results shown.

Holographic subtraction

A holographic technique by which two dissimilar optical fields can be subtracted to yield only their difference is presented. The principle underlying this technique is that of optical interference between a holographically reconstructed field and a direct real-time one. Experimental verification is presented for the three cases of image-plane, fourier-transform, and Fresnel side-band holograms. Also considered is the application of this concept to change detection between photographic transparencies of some scene taken at different times.

Histopathology of hypotrichosis in calves

The histopathology of the skin in hypotrichosis has been studied for a Jersey calf and comparisons made with normal skin. Other abnormalities of the hair follicle have been described in a Hereford mutant.

Application of hologram techniques for particle size analysis

The basic principles of applying hologram techniques to the problem of particle size determination have received considerable attention over the past year. In this paper the basic principles of the use of the Fraunhofer (far field) hologram are described for both the recording of the hologram and the reconstruction of the particle distribution. Factors affecting the sample volume depth and particle size range are discussed. Typical results are shown.