ZELDA, a Zernike wavefront sensor for the fine measurement of
... Still, the remaining NCPA are of the order of a few tens of nanamoeters, preventing coronagraphs from reaching their ultimate performance (up to 107 at 0.2”). These wavefront errors can be split into two contributions: the long-timescale aberrations that are due to the optical surface errors or misa ...
... Still, the remaining NCPA are of the order of a few tens of nanamoeters, preventing coronagraphs from reaching their ultimate performance (up to 107 at 0.2”). These wavefront errors can be split into two contributions: the long-timescale aberrations that are due to the optical surface errors or misa ...
Site testing for the Discovery Channel Telescope
... weather station. Median seeing derived from DIMM measurements for January 2003 – March 2004 on 111 separate nights was 0.84 arcsec, with a first-quartile average of 0.62 arcsec. A wind sensor array deployed on a 12.2m tower is used to characterize air flow over the site. We find that ground induced ...
... weather station. Median seeing derived from DIMM measurements for January 2003 – March 2004 on 111 separate nights was 0.84 arcsec, with a first-quartile average of 0.62 arcsec. A wind sensor array deployed on a 12.2m tower is used to characterize air flow over the site. We find that ground induced ...
01 DS-114AT manual final.qxd
... your discoveries. Clubs are an excellent way to learn more about observing the sky, to find out where the best observing sites are, and to compare notes about telescopes, eyepieces, filters, tripods, and so forth. Often, club members are excellent astrophotographers. Not only will you be able to stu ...
... your discoveries. Clubs are an excellent way to learn more about observing the sky, to find out where the best observing sites are, and to compare notes about telescopes, eyepieces, filters, tripods, and so forth. Often, club members are excellent astrophotographers. Not only will you be able to stu ...
Orion StarMax 127 EQ Manual
... inverted from left-to-right (mirror reversed), which is normal for telescopes that utilize a star diagonal. The image in the finder scope is oriented the same as the naked eye. By loosening or tightening the alignment thumbscrews, you change the line of sight of the finder scope. Continue making adj ...
... inverted from left-to-right (mirror reversed), which is normal for telescopes that utilize a star diagonal. The image in the finder scope is oriented the same as the naked eye. By loosening or tightening the alignment thumbscrews, you change the line of sight of the finder scope. Continue making adj ...
3-D Ultrahigh Resolution Optical Coherence Tomography with
... University of Rochester take the lead in the use of adaptive optics for ophthalmic imaging (D. T. Miller et al, 1996, J. Liang, et al, 1997). They combined the AO with fundus camera. By using AO to correct the aberration caused by large pupil size (6 mm), the transverse resolution of fundus camera a ...
... University of Rochester take the lead in the use of adaptive optics for ophthalmic imaging (D. T. Miller et al, 1996, J. Liang, et al, 1997). They combined the AO with fundus camera. By using AO to correct the aberration caused by large pupil size (6 mm), the transverse resolution of fundus camera a ...
Combating Mirror Seeing
... Zerodur will equalize 1.1x faster than Borofloat when both are the same thickness, say 25mm. Although aluminum is denser than both Zerodur and Borofloat, as well as being quite close to both in heat capacity, it has far superior thermal conductivity. In the same thickness aluminum will equalize 95.7 ...
... Zerodur will equalize 1.1x faster than Borofloat when both are the same thickness, say 25mm. Although aluminum is denser than both Zerodur and Borofloat, as well as being quite close to both in heat capacity, it has far superior thermal conductivity. In the same thickness aluminum will equalize 95.7 ...
Slit lamp biomicroscopy - Optometry Peer Tutoring
... This is an example of retro-illumination of the lens (the light has reflected from the retina). This patient has cortical spokes, which are indicative of early cortical cataract. ...
... This is an example of retro-illumination of the lens (the light has reflected from the retina). This patient has cortical spokes, which are indicative of early cortical cataract. ...
Manufacture of a 1.7 m prototype of the GMT primary mirror segments
... that makes a one-dimensional scan roughly across a diameter of the mirror. The profilometer can measure asphericity to an accuracy of about 50 nm rms, but it is relatively insensitive to average curvature (power). For the off-axis mirror, the profilometer cannot measure the difference in sag between ...
... that makes a one-dimensional scan roughly across a diameter of the mirror. The profilometer can measure asphericity to an accuracy of about 50 nm rms, but it is relatively insensitive to average curvature (power). For the off-axis mirror, the profilometer cannot measure the difference in sag between ...
Orion SkyView Pro™ 127 EQ Telescope Instruction Manual
... If you have trouble focusing, rotate the focus knob counterclockwise as far as it will go. Look through the eyepiece while slowly rotating the focus knob clockwise. You should soon see the point at which focus is reached. Viewing with Eyeglasses If you wear eyeglasses, you may able to keep them on w ...
... If you have trouble focusing, rotate the focus knob counterclockwise as far as it will go. Look through the eyepiece while slowly rotating the focus knob clockwise. You should soon see the point at which focus is reached. Viewing with Eyeglasses If you wear eyeglasses, you may able to keep them on w ...
The US Air Force Academy Falcon Telescope Network
... The Falcon Telescope Network (FTN) is a global network of small aperture telescopes developed by the Center for Space Situational Awareness Research in the Department of Physics at the United States Air Force Academy (USAFA). Consisting of commercially available equipment, the FTN is a collaborative ...
... The Falcon Telescope Network (FTN) is a global network of small aperture telescopes developed by the Center for Space Situational Awareness Research in the Department of Physics at the United States Air Force Academy (USAFA). Consisting of commercially available equipment, the FTN is a collaborative ...
Functional tests of modular elements of segmented optics for X
... from outside via a RS232 interface. The focused beam propagates through Helium in a 12 m tube toward the CCD camera. With respect to the parallel beam direction, the tube is angled to match the beam deviation caused by the mirror stack. The angle has to be varied to fit the reflection angle. The foc ...
... from outside via a RS232 interface. The focused beam propagates through Helium in a 12 m tube toward the CCD camera. With respect to the parallel beam direction, the tube is angled to match the beam deviation caused by the mirror stack. The angle has to be varied to fit the reflection angle. The foc ...
TAL
... alignment to GR axis using A-Scope. “Wall-eye” of PMs and other system flexures need to be quantified and checked against available correction ranges of optical elements. Again, the A-Scope set-up for LBC alignment can give some useful measurements of that. AGW support. FPIA sensitivity to focus and ...
... alignment to GR axis using A-Scope. “Wall-eye” of PMs and other system flexures need to be quantified and checked against available correction ranges of optical elements. Again, the A-Scope set-up for LBC alignment can give some useful measurements of that. AGW support. FPIA sensitivity to focus and ...
Progress Report - Caltech Optical Observatories
... J. Zolkower, “Status of the PALM-3000 high-order adaptive optics system,” Proc. SPIE Astronomical Adaptive Optics Systems and Applications IV, eds. R. Tyson & M. Hart, 7439B, 2009. ...
... J. Zolkower, “Status of the PALM-3000 high-order adaptive optics system,” Proc. SPIE Astronomical Adaptive Optics Systems and Applications IV, eds. R. Tyson & M. Hart, 7439B, 2009. ...
The Integral Payload
... time, AFEE energy, and PSD identifier (singleor multiple-site interaction). Whenever the ACS activates the veto signal, events that occurred in that time period are marked as vetoed and handled separately. The DFEE delivers the annotated lists of AFEE or PSD non-vetoed events to the Digital Processi ...
... time, AFEE energy, and PSD identifier (singleor multiple-site interaction). Whenever the ACS activates the veto signal, events that occurred in that time period are marked as vetoed and handled separately. The DFEE delivers the annotated lists of AFEE or PSD non-vetoed events to the Digital Processi ...
SHS_OH_flame_ApplOpt_revision_RJB
... As another comparison, we consider a Princeton Instruments SP-2150i spectrometer and a Xenics XEVA-LIN CCD camera. The tall pixels and short spectrometer focal length increase the extent of the GS in this case, making it more competitive with SHS. The following grating parameters were used in Equati ...
... As another comparison, we consider a Princeton Instruments SP-2150i spectrometer and a Xenics XEVA-LIN CCD camera. The tall pixels and short spectrometer focal length increase the extent of the GS in this case, making it more competitive with SHS. The following grating parameters were used in Equati ...
Mach Zehnder Interferometer and its Applications
... optical domain. For this, advanced optical networks require all-optical ultrafast signal processing devices. Therefore, alloptical switches are now taking over the use of O-E-O switches. Monolithically integrated MZI switches represent the most promising solution due to their compact size, thermal s ...
... optical domain. For this, advanced optical networks require all-optical ultrafast signal processing devices. Therefore, alloptical switches are now taking over the use of O-E-O switches. Monolithically integrated MZI switches represent the most promising solution due to their compact size, thermal s ...
The achromatic design of an atmospheric dispersion corrector for
... (0.59-0.81 µm), I band (0.78-1.02 µm), J band (1.06-1.44 µm), H band (1.5-1.7 µm), and K band (1.96-2.44 µm) at 45 degrees off Zenith. Although the spot size produced at each individual wavelength is smaller than the Airy disk (the black circle), the image of a star in the R band would appear elonga ...
... (0.59-0.81 µm), I band (0.78-1.02 µm), J band (1.06-1.44 µm), H band (1.5-1.7 µm), and K band (1.96-2.44 µm) at 45 degrees off Zenith. Although the spot size produced at each individual wavelength is smaller than the Airy disk (the black circle), the image of a star in the R band would appear elonga ...
497 Autostar Manual for DS-2090AT-TC and DS-2102AT-TC
... Daylight Savings Time: The next screen requests the status of Daylight Savings Time. Press one of the Scroll keys to toggle between the YES/NO settings. When the desired setting displays, press ENTER. Set Your Location or Zip Code: The Location screen displays. This screen asks you if you wish to ch ...
... Daylight Savings Time: The next screen requests the status of Daylight Savings Time. Press one of the Scroll keys to toggle between the YES/NO settings. When the desired setting displays, press ENTER. Set Your Location or Zip Code: The Location screen displays. This screen asks you if you wish to ch ...
Strategy For Verification and Validation
... needed for the trajectory and alignment control that not only model disparate entities on a single spacecraft, but also straddles information between the two. Software and architecture developed for NWO will benefit future generations of spacecrafts that can leverage the highly synchronized communi ...
... needed for the trajectory and alignment control that not only model disparate entities on a single spacecraft, but also straddles information between the two. Software and architecture developed for NWO will benefit future generations of spacecrafts that can leverage the highly synchronized communi ...
NIO-RPT-0004 - GSMT - National Optical Astronomy Observatory
... Lateral misalignment involves a displacement of the secondary mirror off the system axis without any significant change in mirror spacing. Lateral misalignment will take the form of a tilt or decenter of the secondary mirror axis with respect to the primary mirror axis. This will introduce third ord ...
... Lateral misalignment involves a displacement of the secondary mirror off the system axis without any significant change in mirror spacing. Lateral misalignment will take the form of a tilt or decenter of the secondary mirror axis with respect to the primary mirror axis. This will introduce third ord ...
brochure in PDF format - MIT Haystack Observatory
... eodesy and geophysics are concerned mostly with what is going on under our feet, so it may seem ironic that these two disciplines are advanced by looking up at the stars! VLBI techniques, which were originally developed for studying radio objects in the universe can, in effect, be turned upside down ...
... eodesy and geophysics are concerned mostly with what is going on under our feet, so it may seem ironic that these two disciplines are advanced by looking up at the stars! VLBI techniques, which were originally developed for studying radio objects in the universe can, in effect, be turned upside down ...
Very Large Telescope
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The Very Large Telescope (VLT) is a telescope operated by the European Southern Observatory on Cerro Paranal in the Atacama Desert of northern Chile. The VLT consists of four individual telescopes, each with a primary mirror 8.2 m across, which are generally used separately but can be used together to achieve very high angular resolution. The four separate optical telescopes are known as Antu, Kueyen, Melipal and Yepun, which are all words for astronomical objects in the Mapuche language. The telescopes form an array which is complemented by four movable Auxiliary Telescopes (ATs) of 1.8 m aperture.The VLT operates at visible and infrared wavelengths. Each individual telescope can detect objects roughly four billion times fainter than can be detected with the naked eye, and when all the telescopes are combined, the facility can achieve an angular resolution of about 0.001 arc-second (This is equivalent to roughly 2 meters resolution at the distance of the Moon).In single telescope mode of operation angular resolution is about 0.05 arc-second.The VLT is the most productive ground-based facility for astronomy, with only the Hubble Space Telescope generating more scientific papers among facilities operating at visible wavelengths. Among the pioneering observations carried out using the VLT are the first direct image of an exoplanet, the tracking of individual stars moving around the supermassive black hole at the centre of the Milky Way, and observations of the afterglow of the furthest known gamma-ray burst.