Optical Telescope TechnologyScientific and Technical Information Division, National Aeronautics and Space Administration, 1970 - 783 էջ Design optics and technology for large spaceborne astronomical telescopes. |
From inside the book
Արդյունքներ 100–ի 1-ից 5-ը:
Էջ 28
... temperature typically of the order of 700 ° Kelvin . Frank Low looked at this general area to try to measure this point - like object at 20 microns . Instead , next to the point - object , he found a nebula that is only a factor of 10 ...
... temperature typically of the order of 700 ° Kelvin . Frank Low looked at this general area to try to measure this point - like object at 20 microns . Instead , next to the point - object , he found a nebula that is only a factor of 10 ...
Էջ 31
... temperature ; hence , the investigator has to be working in the general area of 1 ° or 2 ° Kelvin . It is essential that detectors and the cyrogenic problem be worked on jointly . Some of the numerology of this problem is shown in ...
... temperature ; hence , the investigator has to be working in the general area of 1 ° or 2 ° Kelvin . It is essential that detectors and the cyrogenic problem be worked on jointly . Some of the numerology of this problem is shown in ...
Էջ 32
... temperature telescope with an emissivity of 1 , this would be the limiting case . With a reasonable number like a 1 - percent emissivity , this curve is raised by a factor of 10 , which would move the solid curve into the middle . This ...
... temperature telescope with an emissivity of 1 , this would be the limiting case . With a reasonable number like a 1 - percent emissivity , this curve is raised by a factor of 10 , which would move the solid curve into the middle . This ...
Էջ 48
... temperature of the structure is plotted in figure 15. The scale along the bottom is the beta angle . Beta zero means the spacecraft is pointing its opti- cal axis in the anti - sun direction and , con- versely , beta 180 degrees would ...
... temperature of the structure is plotted in figure 15. The scale along the bottom is the beta angle . Beta zero means the spacecraft is pointing its opti- cal axis in the anti - sun direction and , con- versely , beta 180 degrees would ...
Էջ 49
... TEMPERATURE ( ° F ) WEPTAT Zhe +40 SUN +30 B = 20 ° 20 0 C WEP PHOTO oldong on MULTIPLIER TUBES SAO SUN B = 160 ° SAO UVICON CAMERAS 10 20 NEGATIVE POWER FLIP LINE NEGATIVE POWER REGION POSITIVE POWER REGION REGION 30 20 40 60 80 100 ...
... TEMPERATURE ( ° F ) WEPTAT Zhe +40 SUN +30 B = 20 ° 20 0 C WEP PHOTO oldong on MULTIPLIER TUBES SAO SUN B = 160 ° SAO UVICON CAMERAS 10 20 NEGATIVE POWER FLIP LINE NEGATIVE POWER REGION POSITIVE POWER REGION REGION 30 20 40 60 80 100 ...
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Common terms and phrases
alignment analysis angstroms applied arc second array astronomical axis beam beryllium calibration Cer-Vit chamber collimator command configuration curve dark current detector developed diameter dynamic electron elements energy environment equipment experiment package facility film filter flux frequency function gimbal heat pipes inches infrared input instrument irradiance Kitt Peak layer lens light load material measurements ment microns mission mode module mounted nanoamperes Observatory obtained operation optical orbit Orbiting Astronomical Observatory p-n junction percent performance photocathode plate Plumbicon primary mirror problem protons pumps radiation ratio reflectance resolution scanning SEC camera tube SEC target secondary mirror sensor shown in figure signal simulation solar space telescope spacecraft spectral stability star trackers stresses structure surface tape techniques temperature thermal thickness tion torque transmission ultraviolet vacuum vehicle vibration vidicon voltage wavelength
Սիրված հատվածներ
Էջ 261 - Evaluation of Multipoint Interaction in the Design of a Thin Diffraction-Limited Active Mirror.
Էջ 589 - ... A low energy electron beam scans the surface of the silicon depositing charge such that the p-regions exposed to the beam are brought to cathode potential. Thus pn junctions are reverse biased by the beam. During the time that the electron beam is not on an element, the reverse bias voltage across the pn junction decreases as the result of transfer of charge across the junction. This charge arises from either internal generation of free carriers in the material or by photoexcited carriers in...
Էջ 187 - It is the purpose of this discussion to point out some of the possibilities of teaching shop processes in this manner. As Mr. Hesse indicated, "Shop Processes" is an extensive subject and its teaching must be regarded as a continuous project.
Էջ viii - Application of finite element techniques to the design and manufacture of astronomical mirrors...
Էջ 621 - Laboratory for Astrophysics and Space Research of the Enrico Fermi Institute for Nuclear Studies at the University of Chicago — one of the first such university centers in the country. Here, in the sub-basement, in a concrete-shielded counting laboratory, scientists measure radioactivity of meteorites and "space dust" scraped from space flight capsules.
Էջ 296 - Cowper, GR: The Shear Coefficient in Timoshenko's Beam Theory.
Էջ 326 - March 1967. 9. Koopmans, TC, ed.: Activity Analysis of Production and Allocation. Cowles Commission, University of Chicago, 1951.
Էջ 241 - It is convenient in computation to use the same numbering system for bars, torsion bars, and joints. So far in these developments bars have been referred to as a and b. Referring to the numbering system shown above, it will be recognized that in reality a becomes i and b becomes i+1.
Էջ 392 - The two 150-inch telescopes for the Kitt Peak National Observatory and the Cerro Tololo Inter-American Observatory in Chile have solid mirrors of fused silica and Cer-Vit, respectively.
Էջ 679 - ... high cost for large aperture systems. Digital processing has the advantages of being extremely flexible, rather trouble-free and easy to use, once the programming system has been worked out. It also has the ability to handle problems which are nonlinear in both intensity and geometry and can solve these with an accuracy limited only by the user's knowledge of the incoming data. To...