By Virendra N. Mahajan

ISBN-10: 0819405361

ISBN-13: 9780819405364

This ebook offers a transparent, concise, and constant exposition of what aberrations are, how they come up in optical imaging platforms, and the way they have an effect on the standard of pictures shaped by means of them. The emphasis of the publication is on actual perception, challenge fixing, and numerical effects, and the textual content is meant for engineers and scientists who've a necessity and a hope for a deeper and higher realizing of aberrations and Read more...

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Example text

1-15), a, is the radius of the exit pupil ErP,. It is evident from Eqs. (1-14) that, because of a shift in the position of the aperture stop, an aberration of a certain order in pupil coordinates introduces aberrations of all lower orders as well. For example, a term in spherical aberration not only gives spherical aberration, but introduces coma, astigmatism, field curvature, and distortion as well. From Eq. (1 -14a), we note that the peak spherical aberration of a system is independent of the position of its aperture stop.

As a reminder, we add that aa = -aS'/(R + S') ad = - 1/2R(R + S') 2 and Ad = aeh' Za where a = 2 cm is the radius of the mirror. The field curvature as an aberration disappears when the image is observed on a spherical surface of radius of curvature -5 cm for the concave mirror and 5 cm for the convex mirror, located at the image plane. When the object is located at infinity, this surface is concentric with the mirror. Table 4-1. Gaussian and aberration parameters for a spherical mirror of radius a imaging an object lying at a finite distance from it.

As we will discuss in Chapter 6, a paraboloidal mirror forms an aberration-free image of a point object only when it lies on its axis at an infinite distance from it. In order to utilize the simplicity of fabrication of a spherical mirror, we need a way to compensate its spherical aberration. An optical system consisting of a spherical mirror and a transparent plate of nonuniform thickness placed at its center of curvature to compensate for its spherical aberration is called a Schmidt camera. The plate is appropriately called the Schmidt plate.