By Raymond N. Wilson
This quantity is anxious primarily with the fashionable advancements in reflecting telescope optics. within the final 20 years, sleek expertise has revolutionized not just production and attempt tactics but in addition the entire zone of caliber specification with the creation of lively keep watch over into the functioning telescope. different matters lined listed below are alignment of telescope optics, atmospheric optics, together with adaptive optics, reflecting coatings and ancillary apparatus (adapters and baffles). even if an self reliant paintings, Vol. II is seriously cross-referenced with Vol. I. it really is richly illustrated and provides, including Vol. I, the main entire record of references to be had; it may additionally consequently be considered as a resource book.
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Extra info for Reflecting Telescope Optics II: Manufacture, Testing, Alignment, Modern Techniques
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48J. 49J. He considers very large mirrors with a thickness in agreement with an axial support density under gravity to give an acceptable sag between supports. 18) where 8r is the relative density, v the Poisson ratio, 9 the acceleration due to gravity and E Young's modulus. 94 and can usually be set c:::' 1. 2 Grinding, polishing and figuring technology 27 for a given material. 20) Lemaitre then considers the stressed polishing situation for mirror thicknesses t giving a reasonable support density.
As would be expected, the coma 0:31 and astigmatism 0:22 terms are completely dominant. :31 10 ~ (corna) '[ N 1: Q) E Q) I 1il a. 0 <\2 , ,I, , 11 d 10 Off Axis Distance pp(m) Fig. 24. 7m, TO = 40m). Best fitting sphere assumed. 39]) The plate bending theory is based on Eqs. 17) for thin plates. The desired deflection expressed by Eq. 21) may be produced by a combination of bending moments and shearing forces around the edge and uniform transverse loading. For the loading required, a more accurate theory for moderately thick plates was used.
Membrane polishing requires a special membrane for each mirror and had only been extensively used up to 1992 on the SOFIA mirror. Fine figuring at the very end is usually done with stiff sub-apert ure tools using pressure control. Such a final stage may require up to 200 hours , but this may be improved by a factor of 3. Typically, near the end, 5 min polishing time may be followed by 40 min cleaning and 1-2 h testing! The active optics relaxation of low spatial frequency terms, above all astigmatism, is a big help in retouching of high spatial frequency errors.