ASTR633 Astrophysical Techniques Course slides Chapter 2: Telescopes
Build the largest telescope you can! reflectors refractors doubling time ~ 50 yr
Huygens-Fresnel principle
Huygens-Fresnel principle wikipedia!
Airy Function k = 2 π / λ
Reflectors vs Refractors Refractors have wavelength-dependent focus (chromatic aberration). Reflectors do not. Refractors need bubble-free volumes. Reflectors only need bubble-free surfaces. Refractors must be supported at the edge ! weakest point. Reflectors can be supported over the entire back. Refractors require large tubes. Reflectors allow for more compact designs. ! All OIR scientific telescopes are reflectors.
Newtonian No correction for curved primary => aberrations wikipedia!
Cassegrain Ritchey-Chretien has a hyperbolic (not parabolic) primary wikipedia!
Gregorian wikipedia!
UH 2.2m Equatorial Mount and Coudé Focus 88-inch Reflector Figure 6.3: Layout of the 2.2-m telescope dome El. 13,824 Observing Platform Control Room Coudé Room Aluminizing Tank coudé = elbow http://www.ifa.hawaii.edu/88inch/manuals/user.pdf
CFHT —> MSE?
Subaru Alt-Az Mount and Nasymth Focus
Arecibo Spherical Reflector
Two mirror system plate scale = θ /y ≈ (y/f)/y = 1/f
IRTF Secondary Mirror f/38
Pan-STARRS Secondary Mirror f/4.4
LSST Optical Design
LSST Optical Design
Gemini IR Optimized Telescope 50g Ag http://www.gemini.edu/project/announcements/press/2004-12.html
GBT = Green Bank Telescope (aka Great Big Thing) 100m f/0.6, λ = 3mm - 30cm Largest steerable structure in the world O ff -axis paraboloid Active surface
Inteferometry —> structural rigidity on long baselines
Chandra Optics
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