# The Principles of Astronomical Telescope Design (Astrophysics and Space Science Library)

## Jingquan Cheng

Language: English

Pages: 634

ISBN: 0387887903

Format: PDF / Kindle (mobi) / ePub

This book presents a complete summary of the author's twenty five years of experience in telescope design. It provides a general introduction to every aspect of telescope design. It also discusses the theory behind telescope design in depth, which makes it a good reference book for professionals. It covers Radio, Infrared, Optical, X-Ray and Gamma-Ray wavelengths. Originally published in Chinese.

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And 2 represent the parameters of the primary and secondary mirrors respectively. If no Subscript, the parameters are those for the system. The formula for the system focal length is: 1 1 1 d ¼ þ À f f1 f2 f1 Á f2 (1:70) where d is the distance between the primary and secondary. If m is the magnification of the secondary mirror, then f ¼ mf1 . The aberration formulas for a general dual reflector optical system are (Wilson, 1968): y 4 1 SI ¼ ðÀf& þ LxÞ 4 y 3 f sp1 1 ðÀf& þ LxÞup1 SII ¼ ½Àdx.

Zd Þ À 2rxd À e2 xd (1:101) C ¼ x20 þ y20 þ z20 À 2rx0 À e2 x0 Algebraic method used in ray tracing is generally less effective than geometrical method. Using geometrical method to find the intersection point between a ray and a spherical surface, two triangles are formed. One is the triangle EOP, where E is the ray starting point, O is the center of the spherical surface, and P is the intersection point between the ray and the surface, and the other is a triangle OPD, where D is a point in the.

Two axes, which support the telescope weight, change direction with respective to the gravity. The mounting is sturdiest and simplest. The reduction of weight and cost is significant. For telescope design, bending and torsion are the worst among deformations, while compression and shear introduce no pointing errors. The compression stiffness is also much larger than the bending stiffness, so that the compression and shear effects are generally small. For this reason, heavy and large radio.

These trusses intersect each other on one plane within the central block to avoid any unwanted moments applied on the tube central block. The other ends of these trusses support the primary mirror cell and secondary mirror top ring. With this design, when the tube is in vertical direction, the primary and secondary mirrors shift along the axis. There is no pointing error introduced. When the tube is in horizon direction, the top and bottom truss members do not Fig. 3.14. (a) Conventional and (b).

Brief History of Optical Telescopes 3 magnification or magnification factor is the ratio between the angle subtended by the output image and the angle subtended by the input object. Kepler telescopes usually have larger magnification than Galileo ones. Large telescopes are often used to form a direct image, for example, an image on a detector. For these large telescopes, another parameter, resolution, is used instead of the magnification. Resolution is the ability to separate two closely.