By Stephen Houlgate
This vintage advent to at least one of the main influential glossy thinkers, G.W.F. Hegel (1770-1831), has now been up to date and improved to make it much more accomplished.
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Extra info for An Introduction to Hegel: Freedom, Truth and History, 2 edition
A Fourier transform hologram (a) and its reconstructed true image (b) are shown in these photographs. Note that the dominant structure of the hologram is now linear rather than cireular as for the Fresnel hologram. Both images should be in foeus, but due to imperfeet aeoustic lens placement this is not so. 28 Chapter 2 OBJECT OBJECT WAVE (IMAGE OF OBJECTI REFERENCE WAVE Fig. 10. The focused-image hologram is made by imaging the object into the-recording plane as shown here. 5. Focused-Image Holograms This is one classification of holography that has not been discussed in detail.
Note that the hologram information is stored on a very small part of the aperture; namely the focused F. Hence we obtain only a weak image. 30 Chapter 2 REFERENCE STRUCTURE 5 2Ix 2·z 2) PRIMARY RECOROING SOURCE VIII) RECOROING PLANE Fig. 12. This drawing establishes the nomencIature for the recording step for our general analysis. We allow complete generality by considering the coherence of the source, and arbitrary illumination and reference structures. tion reflected from or transmitted by the illumination structure illuminates the object which, in turn, reflects radiation to the recording plane.
2. Fraunhofer Holograms A Fraunhofer hologram is defined as the interference pattern between two collinear radiation beams, where the pattern is recorded in the far field or Fraunhofer zone of the object generating one of the beams . Using our example of a spherical and plane beam, this means that the hologram Chapter 2 26 is made so far away from the center of curvature of the spherical beam that it appears plane over the extent of the hologram. The advantage of this type of hologram over the Fresnel hologram is that the twin image is so far away from the image we wish to photograph that it does not contribute much noise or interference.
An Introduction to Hegel: Freedom, Truth and History, 2 edition by Stephen Houlgate