Coherent Optics in Mapping

Abstract

Several potential applications of coherent optics in the field of topographic mapping have been identified.' This paper outlines the motivation for applying coherent optics to topographic mapping, presents some additional applications not included in Ref.

Applications of holography

“…When the hologram cannot be easily recorded, then some other intermediate technique has to be employed and then that intermediate record is converted into a hologram. One concept is to record on a single hologram the two stereo transparencies with the appropriate orientation ; such a holographic record has been called a holographic stereo model (Mikhail 1974). Figure 8(a) shows the method used for recording the holographic stereo model as an off-axis Fresnel hologram.…”

“…That is, the fringes are fringes of equal amplitude of vibration. Figure 23 (plate) shows in (a) an image of an acoustic transducer vibrating in its fundamental mode with an applied signal of 490 Hz (Monahan and Bromley 1968). If the amplitude of vibration is increased, then the number of fringes would be increased.…”

“…A straightforward but not entirely accurate way of looking at these fringes is that given by Monahan and Bromley (1968). If we consider a vibrating membrane that is vibrating in its fundamental mode, then fringes will be formed when 2d(cos 6+cos $)=n where JO is the zero-order Bessel function, D is the amplitude of vibration, and h is the wavelength.…”

Pixel displacement determination in cascaded images utilizing coherent light fringe patterns

“…The two major types of techniques used in this area are image-image correlation (7,8,9) and image-matched filter correlation (10,11,12,13,14). Gopfert (10) gives an extensive list of references in this area up to 1976.…”