ZERODUR ® - Catalogue
... Slight changes in the CTE may occur if ZERODUR® is cooled down from application temperatures between 130°C and 320°C to room-temperature with a rate that differs from the initial cooling rate. ZERODUR® is generally cooled during production at an initial cooling rate of between 1°/h and 6°/h. Each fa ...
... Slight changes in the CTE may occur if ZERODUR® is cooled down from application temperatures between 130°C and 320°C to room-temperature with a rate that differs from the initial cooling rate. ZERODUR® is generally cooled during production at an initial cooling rate of between 1°/h and 6°/h. Each fa ...
Operating Manual
... The ST-7E, ST-8E, ST-9E and ST-10E cameras include an exciting new feature: self-guiding (US Patent 5,525,793). These cameras have two CCDs inside; one for guiding and a large one for imaging. The low noise of the read out electronics virtually guarantees that a usable guide star will be within the ...
... The ST-7E, ST-8E, ST-9E and ST-10E cameras include an exciting new feature: self-guiding (US Patent 5,525,793). These cameras have two CCDs inside; one for guiding and a large one for imaging. The low noise of the read out electronics virtually guarantees that a usable guide star will be within the ...
lab-manual-for-physics itm university
... free from dust. Now fill the tube with pure water and see that no air bubble is enclosed it. Place the tube in its position inside the Polarimeter. 3. Switch on the source of light and look through the eyepiece. Two halves of unequal intensity is observed. Rotate the analyzer until two halves of the ...
... free from dust. Now fill the tube with pure water and see that no air bubble is enclosed it. Place the tube in its position inside the Polarimeter. 3. Switch on the source of light and look through the eyepiece. Two halves of unequal intensity is observed. Rotate the analyzer until two halves of the ...
WAVEFRONT SENSOR FOR THE GAIA MISSION
... that in order to reach all requirements with a refractive element, that element would consist of 4 different types of glass (due to the wavelength range 450-900 nm), which is unnecessary complex (and risky). For the microlens array, the wavelength requirement has less influence: the spots are well d ...
... that in order to reach all requirements with a refractive element, that element would consist of 4 different types of glass (due to the wavelength range 450-900 nm), which is unnecessary complex (and risky). For the microlens array, the wavelength requirement has less influence: the spots are well d ...
7. Non-adaptive wavefront control
... configurations being very similar. Figure 7-6 shows that the dynamics of the azimuth models for the 30 degree and the 60 degree configurations are also nearly identical. Robust controllers are now designed with the objective of tracking errors of less than 0.3 arcsec RMS, taking into account the sys ...
... configurations being very similar. Figure 7-6 shows that the dynamics of the azimuth models for the 30 degree and the 60 degree configurations are also nearly identical. Robust controllers are now designed with the objective of tracking errors of less than 0.3 arcsec RMS, taking into account the sys ...
Miniaturized Shack-Hartmann Wavefront-Sensors for Starbugs
... 1.5 mm in diameter and contain 7000 cores that are each approx. 16 microns in diameter. The efficiency has been measured to be approximately 75% with a numerical aperture (NA) ranging from 0.16 to 0.37, allowing the relay of focal beams as fast as F/1.3 to 3.1 [11]. The AAO has used the polymer cohe ...
... 1.5 mm in diameter and contain 7000 cores that are each approx. 16 microns in diameter. The efficiency has been measured to be approximately 75% with a numerical aperture (NA) ranging from 0.16 to 0.37, allowing the relay of focal beams as fast as F/1.3 to 3.1 [11]. The AAO has used the polymer cohe ...
AG Optical Systems iDK Manual V10 2014
... on the face of the telescope back plate at roughly the 4 and 8 o’clock positions. The black recessed socket cap screw that is visible at the top (12 o’clock position) of the back plate should not be adjusted. Once collimation is achieved, the position of the primary mirror can be locked into place ...
... on the face of the telescope back plate at roughly the 4 and 8 o’clock positions. The black recessed socket cap screw that is visible at the top (12 o’clock position) of the back plate should not be adjusted. Once collimation is achieved, the position of the primary mirror can be locked into place ...
An Adaptive Secondary Mirror Demonstrator: Construction and
... telescope as a system will fail if the ASM control fails. Moreover, when near Zenith-pointing, the secondary mirror is directly over the telescope primary, which is therefore potentially vulnerable to any catastrophic stress induced fracture of the secondary. Therefore, there are compelling advantag ...
... telescope as a system will fail if the ASM control fails. Moreover, when near Zenith-pointing, the secondary mirror is directly over the telescope primary, which is therefore potentially vulnerable to any catastrophic stress induced fracture of the secondary. Therefore, there are compelling advantag ...
MEGARA spectrograph for the GTC
... The focus depth implies that the minimum step for adjustment shall be 10 µm and the total range of movement ~3.5 mm. 3.3 Collimator barrel and shutter The collimator lenses are placed on a common barrel, as seen on figures 1 and 2. The singlet and doublets are inserted with subcells on this barrel. ...
... The focus depth implies that the minimum step for adjustment shall be 10 µm and the total range of movement ~3.5 mm. 3.3 Collimator barrel and shutter The collimator lenses are placed on a common barrel, as seen on figures 1 and 2. The singlet and doublets are inserted with subcells on this barrel. ...
Astronomical seeing conditions as determined by turbulence modelling and optical measurement
... Modern space geodetic techniques are required to provide measurements of millimetrelevel accuracy. A new fundamental space geodetic observatory for South Africa has been proposed. It will house state-of-the-art equipment in a location that guarantees optimal scientific output. Lunar Laser Ranging (L ...
... Modern space geodetic techniques are required to provide measurements of millimetrelevel accuracy. A new fundamental space geodetic observatory for South Africa has been proposed. It will house state-of-the-art equipment in a location that guarantees optimal scientific output. Lunar Laser Ranging (L ...
Looking Through a Telescope with an Obsidian Mirror
... Convex cut mirrors manufactured from the volcanic glass obsidian had been known since Neolithic time (7400/7100 to about 6200 BCE) in Çatalhöyük, Turkey. A Herschelian type telescope made with an obsidian mirror ( 12 cm) allowed to see the Moon‟s craters sharp and distinct, the phases of Venus as w ...
... Convex cut mirrors manufactured from the volcanic glass obsidian had been known since Neolithic time (7400/7100 to about 6200 BCE) in Çatalhöyük, Turkey. A Herschelian type telescope made with an obsidian mirror ( 12 cm) allowed to see the Moon‟s craters sharp and distinct, the phases of Venus as w ...
Functional and Performance Requirements
... 4.1.3 Spatial Resolution ............................................................................................ 9 4.1.4 Spectral Resolution .......................................................................................... 9 4.1.5 System Sensitivity .................................... ...
... 4.1.3 Spatial Resolution ............................................................................................ 9 4.1.4 Spectral Resolution .......................................................................................... 9 4.1.5 System Sensitivity .................................... ...
Meade® Illuminated Reticle Eyepiece Systems
... MA12mm Astrometric Eyepiece is an important tool for the advanced amateur. The laser-etched reticle (below) is evenly illuminated by an internal red LED, with illumination intensity variable from bright to faint. Four types of measuring scales are included, for measuring double star angular separati ...
... MA12mm Astrometric Eyepiece is an important tool for the advanced amateur. The laser-etched reticle (below) is evenly illuminated by an internal red LED, with illumination intensity variable from bright to faint. Four types of measuring scales are included, for measuring double star angular separati ...
Fabrication of large secondary mirrors for astronomical telescopes
... The Sloan and MMT f/9 secondary mirrors are made from borosilicate glass using the gas-fusion technique by Hextek. The face plate and back plates are about 12mm thick and the cell size is roughly 75 mm. These mirrors are around 150 mm thick and are made plano-plano and slumped, so the rear surface ...
... The Sloan and MMT f/9 secondary mirrors are made from borosilicate glass using the gas-fusion technique by Hextek. The face plate and back plates are about 12mm thick and the cell size is roughly 75 mm. These mirrors are around 150 mm thick and are made plano-plano and slumped, so the rear surface ...
pdf
... 1 mm, and perhaps as large as 1 cm, in the dense parts of the filament. These grains are much larger than typically found in the diffuse interstellar medium, and this would be the first report of large grains in structures with scales on the order of 1 pc. Although a power-law spectrum has been used ...
... 1 mm, and perhaps as large as 1 cm, in the dense parts of the filament. These grains are much larger than typically found in the diffuse interstellar medium, and this would be the first report of large grains in structures with scales on the order of 1 pc. Although a power-law spectrum has been used ...
mach-zehnder wavefront sensor for phasing of segmented
... principle, identical to that routinely implemented in the Keck. Position sensors conveniently located at the back or the edges of the segments provide, in real time, measurements of the inter-segments steps, down to a few nanometers accuracy. Whichever technology such sensors rely on, periodic calib ...
... principle, identical to that routinely implemented in the Keck. Position sensors conveniently located at the back or the edges of the segments provide, in real time, measurements of the inter-segments steps, down to a few nanometers accuracy. Whichever technology such sensors rely on, periodic calib ...
What to do to a Dob
... Collimation – Newtonian Telescopes What needs adjustment? • Insertion of the secondary mirror • Orientation of the secondary mirror ...
... Collimation – Newtonian Telescopes What needs adjustment? • Insertion of the secondary mirror • Orientation of the secondary mirror ...
Seeing the infinitely small - Musées de la Ville de Genève
... has it that the telescope has its origins in Holland where children had apparently discovered that they could see into the distance while looking through two lenses placed one in front of the other. At the beginning of the 17th century Lippershey, a Dutch craftsman, sold an instrument “for seeing th ...
... has it that the telescope has its origins in Holland where children had apparently discovered that they could see into the distance while looking through two lenses placed one in front of the other. At the beginning of the 17th century Lippershey, a Dutch craftsman, sold an instrument “for seeing th ...
Tight L iso -E p -Γ 0 Relation of Long Gamma
... B, V, R, I observations with our 60/ 80 cm telescopes in Xinglong Observatory. Liang + 2016, in prep. ...
... B, V, R, I observations with our 60/ 80 cm telescopes in Xinglong Observatory. Liang + 2016, in prep. ...