Fabri lens

Wedge-form of polarized modulator or inclination of its optics to the optical axis. In this case there is a beam deflection from the optical axis and a "dancing" image appears when the Polaroid is rotated. This can result from imperfect focusing of a Fabri lens onto a photocathode, which has different spectral response at different locations. 

Fig. 11 Geometry of interferometers and basic components. 1 Mach-Zehnder d interaction distance of light and sensing region. 2 Young M microscope objective, / length of the sensing window, d distance between the parallel channels, L lens, Z distance between the CCD camera and the end face of the interferometer. 3 Fabry-Perot G parallel mirrors, d distance between mirrors or the medium filling the cavity, L lens...

The Fabry-Perot type used by Benard, which produces fringes of equal thickness, is shown schematically in Fig. 6. Monochromatic light from a source S is collimated by the lens L and is directed vertically onto the... 

Two screening studies have been done on the dielectric properties of an SiOC-Nextel 312 BN composites. In the first study in 1992 by Lockheed Missiles, a frequency range of 8 to 12 GHz was used and the properties were measured by either a Horn-Lens dielectrometer or a Fabry-Perot resonator system. All measurements were taken at room temperature. The composites were prepared from eight plies of AF-14 plain weave fabric. Four infiltration cycles were used for densification. The total porosity of the composites was about 11 %. The data generated for the Nextel 312 system are shown in Figure 20. Note that as an additional processing variable, two test specimens were heated in air (at 450°C and at 750°C) to remove any residual carbon. 

Many instruments designed to analyze spectral information, such as Fabry-Perot and Michelson interferometers, operate best in a collimated beam. Telescopes that produce such a beam are well-known for visual observations the Galilean and the astronomical telescope are examples. The first uses a convex objective lens and a concave eyepiece, while the latter a similar objective and an eyepiece of convex curvature. In either case, the focal points of both lenses must coincide. Implementations of both systems with mirrors and lenses are shown in Fig. 5.2.8. Afocal systems have the object as well as the image at infinity. The example shown... 

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