By Daniel Malacara
The aim of this 3rd variation is to collect in one ebook descriptions of all assessments conducted within the optical store which are appropriate to optical parts and structures. This booklet is meant for the professional in addition to the non-specialist engaged in optical store trying out. there's at present loads of examine being performed in optical engineering. Making this new version very well timed.
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Extra resources for Optical Shop Testing
4. Radius of curvature increment per fringe for several values of the power ratio r=D of the spherical surface being tested with newton fringes. 14. Schematic arrangement showing the method of measuring aspheric surfaces with a spherical test plate using Newton fringes. 3. FIZEAU INTERFEROMETER 17 Instead of directly measuring the fringe positions with a microscope, a photograph can be taken, and then the fringe positions can be measured with more conventional procedures. If the reference surface is spherical and the surface under test is aspherical (hyperboloid or paraboloid), the ideal fringe patterns will be those of a Twyman– Green interferometer for spherical aberration as described in Chapter 2.
Materials for the Optical Flats The optical flats are generally made of glass, fused silica, or more recently developed zero expansion materials such as CerVit and ULE glass. Small optical flats of less than 5 cm in diameter can be made of glass; they reach homogeneous temperature conditions reasonably quickly after some handling. It is preferable to make optical flats of larger sizes from fused silica or zero expansion materials. 3 gives relevant information regarding the materials commonly used for making optical flats.
In this situation concentric circular Haidinger fringes will be seen on the cardboard surrounding the hole. If the plate is free from the wedge, the center of the Haidinger fringe system coincides with the center of the hole. If the plate has a wedge, the center of the Haidinger fringe system is displaced with respect to the center of the hole. An approximate formula relating this displacement to the wedge angle of the wedged glass plate is as follows: d¼ 2N 2 r 2 a t ð1:28Þ where d ¼ displacement of the Haidinger fringe system, a ¼ wedge angle of the plate, t ¼ thickness of the glass plate, N ¼ refractive index of the glass plate, r ¼ distance of the point source from the glass plate.
Optical Shop Testing by Daniel Malacara