Focus and pointing adjustments necessary for laser guide star
... The plate scale of the telescope is 0.727 mm/arcsec, which implies an allowable focus shift of 0.0156 arcsecs * 0.727 mm/arcsec=0.0113 mm. This is converted to an allowable focal plane shift by multiplying by the telescope focal ratio (15), so ∆Z = 0.17 mm. This is the requirement at zenith. The def ...
... The plate scale of the telescope is 0.727 mm/arcsec, which implies an allowable focus shift of 0.0156 arcsecs * 0.727 mm/arcsec=0.0113 mm. This is converted to an allowable focal plane shift by multiplying by the telescope focal ratio (15), so ∆Z = 0.17 mm. This is the requirement at zenith. The def ...
User`s Manual (Updated 9
... astigmatism and coma are produced, with the total amount proportional to the beam f/number and thickness of the glass. In the WTTM the path to the error sensor passes through some 12 mm of glass at an incidence of approximately 45 degrees. The compensator element corrects for all the spherical and c ...
... astigmatism and coma are produced, with the total amount proportional to the beam f/number and thickness of the glass. In the WTTM the path to the error sensor passes through some 12 mm of glass at an incidence of approximately 45 degrees. The compensator element corrects for all the spherical and c ...
mach-zehnder wavefront sensor for phasing of segmented
... In Fig.7 we show three sets of interferograms for different OPDs, conveniently introduced as a constant phase shift in the reference arm of the interferometer. From left to right, the figure shows the interferogram profiles for the two outputs and their difference (referred to as differential interf ...
... In Fig.7 we show three sets of interferograms for different OPDs, conveniently introduced as a constant phase shift in the reference arm of the interferometer. From left to right, the figure shows the interferogram profiles for the two outputs and their difference (referred to as differential interf ...
The Hubble Space Telescope
... hy would a telescope in space allow the images to be ten times sharper than one on Earth? A. The telescope would be much closer to the object. B. Since there is zero gravity, the telescope can focus better. C. The telescope in space would be above Earth’s atmosphere. D. The telescope in space ...
... hy would a telescope in space allow the images to be ten times sharper than one on Earth? A. The telescope would be much closer to the object. B. Since there is zero gravity, the telescope can focus better. C. The telescope in space would be above Earth’s atmosphere. D. The telescope in space ...
LaPalma_2013_Hook
... polynomial expansions in terms of angular position (and radial distance ( on the exit pupil he first few are: ...
... polynomial expansions in terms of angular position (and radial distance ( on the exit pupil he first few are: ...
Subject: Koblenz meeting From: Peter Abrahams
... Steve Rohan followed, showing a DVD, 'The different versions of the Zeiss 8 x 60', in which a chronology of these models was presented, with a video clip of each model and a description of its features. Included was the Askania 8x60, designed as a case with two monoculars, on a gimbaled mount, an ex ...
... Steve Rohan followed, showing a DVD, 'The different versions of the Zeiss 8 x 60', in which a chronology of these models was presented, with a video clip of each model and a description of its features. Included was the Askania 8x60, designed as a case with two monoculars, on a gimbaled mount, an ex ...
Combating Mirror Seeing
... can compare different materials to each other. The formula accounts for the thickness of the material, heat capacity, thermal conductivity, and density of the material. Zerodur will equalize 1.1x faster than Borofloat when both are the same thickness, say 25mm. Although aluminum is denser than both ...
... can compare different materials to each other. The formula accounts for the thickness of the material, heat capacity, thermal conductivity, and density of the material. Zerodur will equalize 1.1x faster than Borofloat when both are the same thickness, say 25mm. Although aluminum is denser than both ...
Durham Research Online
... can be seen that, as expected, performance increases with the number of guide stars. However, the gain in performance moving from 6 to 8 LGS (typically 10–20%) is not as significant as moving from 4 to 6 (a 30–70% gain), suggesting that using 6 LGS would present a good trade-off between cost and per ...
... can be seen that, as expected, performance increases with the number of guide stars. However, the gain in performance moving from 6 to 8 LGS (typically 10–20%) is not as significant as moving from 4 to 6 (a 30–70% gain), suggesting that using 6 LGS would present a good trade-off between cost and per ...
The Unique Optical Design of the NESSI Survey Telescope
... modifications of the existing Paul-Baker optics. As mentioned above, the classic Paul design results in a curved image surface. Lenses easily flatten the image but introduce lateral color, thereby requiring more lenses to correct the chromatic aberrations. We looked at a number of Paul configuration ...
... modifications of the existing Paul-Baker optics. As mentioned above, the classic Paul design results in a curved image surface. Lenses easily flatten the image but introduce lateral color, thereby requiring more lenses to correct the chromatic aberrations. We looked at a number of Paul configuration ...
120 Inch Telescope Aluminizing 2-7-06
... 5. Remove most of cell/platform bolts if necessary for alignment. 6. Install 4 bolts at N-S-E-W position and torque with 2 man power. Use tubing extension on flex handle (38). (Nut size 2-3/16 inch, bolt size 2¼ inch. Due to clearance problems on east and west sides, we need to use a ratcheting exte ...
... 5. Remove most of cell/platform bolts if necessary for alignment. 6. Install 4 bolts at N-S-E-W position and torque with 2 man power. Use tubing extension on flex handle (38). (Nut size 2-3/16 inch, bolt size 2¼ inch. Due to clearance problems on east and west sides, we need to use a ratcheting exte ...
Project_Description2
... Samples produced will be subjected to accelerated aging tests in humid and high-H2SO4 environments, and checked for adhesion and abrasion using standard tests. At the same time as this research into coating development is on-going, the swing-arm facility will allow us to coat large substrates withou ...
... Samples produced will be subjected to accelerated aging tests in humid and high-H2SO4 environments, and checked for adhesion and abrasion using standard tests. At the same time as this research into coating development is on-going, the swing-arm facility will allow us to coat large substrates withou ...
Modeling the Spectral Energy Distributions and Variability
... • Short (sub-second to minutes) flashes of gammarays, for ~ 30 years not associated with any counterparts in other wavelength bands • First dedicated GRB detector: BATSE on the ...
... • Short (sub-second to minutes) flashes of gammarays, for ~ 30 years not associated with any counterparts in other wavelength bands • First dedicated GRB detector: BATSE on the ...
Chapter 30 The Law of Reflection
... light travels in a straight line. The wavelength of light is so small that in a relatively short distance away from the point source of light, the waves appear plane. Even if the source of light is not a point, when we are sufficiently far away from the source, the waves are effectively plane. In al ...
... light travels in a straight line. The wavelength of light is so small that in a relatively short distance away from the point source of light, the waves appear plane. Even if the source of light is not a point, when we are sufficiently far away from the source, the waves are effectively plane. In al ...
Binoculars - shapes and lenses
... This class features THREE-element objective lenses, for more uniform focus of the colors, and two-element eyepiece lenses with special “aspheric” / “field flattener” shapes to get sharp focus across the full field of view. This produces a noticeably improved image, clearer and sharper, with even les ...
... This class features THREE-element objective lenses, for more uniform focus of the colors, and two-element eyepiece lenses with special “aspheric” / “field flattener” shapes to get sharp focus across the full field of view. This produces a noticeably improved image, clearer and sharper, with even les ...
Surplus Shed Catalog
... from the most elementary to the most sophisticated levels of understanding. The kit provides the investigative tools needed to begin the step-bystep process of scientific discovery.SciFinder optics are all anti-reflection coated for high contrast and clear crisp images. 4 high power objectives rotat ...
... from the most elementary to the most sophisticated levels of understanding. The kit provides the investigative tools needed to begin the step-bystep process of scientific discovery.SciFinder optics are all anti-reflection coated for high contrast and clear crisp images. 4 high power objectives rotat ...
Interdisciplinary Evolution of the Hubble Space Telescope
... Aperture door Protects Hubble's optics in the same way a camera's lens cap shields the lens. It closes when Hubble is not in operation to prevent bright light from hitting the mirrors and instruments. Light shield Light passes through this shaft before entering the optics system. It blocks surroundi ...
... Aperture door Protects Hubble's optics in the same way a camera's lens cap shields the lens. It closes when Hubble is not in operation to prevent bright light from hitting the mirrors and instruments. Light shield Light passes through this shaft before entering the optics system. It blocks surroundi ...
Optimal pupil size in the human eye for axial resolution
... the improvements in resolution that one expects to obtain, according to diffraction theory, with increasing pupil size. This is well understood for lateral resolution in the human eye. The effect of aberrations in connection with pupil size was quantified first by Campbell and Green1 and in a follow ...
... the improvements in resolution that one expects to obtain, according to diffraction theory, with increasing pupil size. This is well understood for lateral resolution in the human eye. The effect of aberrations in connection with pupil size was quantified first by Campbell and Green1 and in a follow ...
Optical telescope
An optical telescope is a telescope that gathers and focuses light, mainly from the visible part of the electromagnetic spectrum, to create a magnified image for direct view, or to make a photograph, or to collect data through electronic image sensors.There are three primary types of optical telescope: refractors, which use lenses (dioptrics) reflectors, which use mirrors (catoptrics) catadioptric telescopes, which combine lenses and mirrorsA telescope's light gathering power and ability to resolve small detail is directly related to the diameter (or aperture) of its objective (the primary lens or mirror that collects and focuses the light). The larger the objective, the more light the telescope collects and the finer detail it resolves.People use telescopes and binoculars for activities such as observational astronomy, ornithology, pilotage and reconnaissance, and watching sports or performance arts.