A S R TRATEGY
... the design, the conic constants (negative of the squared eccentricities) of the primary and secondary mirrors were chosen to yield zero third-order spherical aberration and field coma on the focal surface. (This is the Ritchey-Chrétien criterion.) The image quality of a precision optical system like ...
... the design, the conic constants (negative of the squared eccentricities) of the primary and secondary mirrors were chosen to yield zero third-order spherical aberration and field coma on the focal surface. (This is the Ritchey-Chrétien criterion.) The image quality of a precision optical system like ...
Hot slumping glass technology and integration process to
... The realization of the mirror unit appeared from the beginning as one of the technology driver. For such a big size, it is impossible to rely on monolithic pseudo-cylindrical close mirror shells, losing the intrinsic stiffness coming from a close structure with cylindrical symmetry. Due to the IXO m ...
... The realization of the mirror unit appeared from the beginning as one of the technology driver. For such a big size, it is impossible to rely on monolithic pseudo-cylindrical close mirror shells, losing the intrinsic stiffness coming from a close structure with cylindrical symmetry. Due to the IXO m ...
- Lorentz Center
... for fine gimbal tip/tilt and focus adjustment Simple box construction with cross-bracing cables to increase structural stiffness Measured 64% of output laser power to sky ...
... for fine gimbal tip/tilt and focus adjustment Simple box construction with cross-bracing cables to increase structural stiffness Measured 64% of output laser power to sky ...
Ch.6 Vision
... (your eye color)- this allows the pupil to get smaller in bright light and larger in dim light. ...
... (your eye color)- this allows the pupil to get smaller in bright light and larger in dim light. ...
Optical Specifications (Tech Report #35)
... refractive corrector can be installed at the f/5 focus to produce a very wide eld, the f/9 focus will accommodate the current instruments and the f/15 will be used for the IR and for adaptive optics. These foci in combination will give the converted MMT an unsurpassed versatility. ...
... refractive corrector can be installed at the f/5 focus to produce a very wide eld, the f/9 focus will accommodate the current instruments and the f/15 will be used for the IR and for adaptive optics. These foci in combination will give the converted MMT an unsurpassed versatility. ...
alignment of the fold mirror
... Align the laser so that it crosses the cross hairs of the spaceframe assembly. A best average positioning will have to be chosen. Place a mirror independent of the spaceframe/weldment assembly, at the grating end of the assembly and adjust it until the return of the laser comes back on itself. Remov ...
... Align the laser so that it crosses the cross hairs of the spaceframe assembly. A best average positioning will have to be chosen. Place a mirror independent of the spaceframe/weldment assembly, at the grating end of the assembly and adjust it until the return of the laser comes back on itself. Remov ...
Article - Agenda INFN
... K-B configuration consists of two perpendicular concave spherical mirrors in tandem. Rays from object point are reflected by the first mirror (tangential mirror here) and form a tangential line while not a point. Similarly, rays via the second mirror (sagittal mirror here) form a sagittal line. Thus ...
... K-B configuration consists of two perpendicular concave spherical mirrors in tandem. Rays from object point are reflected by the first mirror (tangential mirror here) and form a tangential line while not a point. Similarly, rays via the second mirror (sagittal mirror here) form a sagittal line. Thus ...
9. Telescope structure and kinematics
... 100-m class telescope is one of the major challenges of the OWL project. The structure must provide sufficient bandpass for the motion control system as well as the required tracking accuracy and dimensional stability under varying gravity, thermal and wind loads. The achievable limits of structural ...
... 100-m class telescope is one of the major challenges of the OWL project. The structure must provide sufficient bandpass for the motion control system as well as the required tracking accuracy and dimensional stability under varying gravity, thermal and wind loads. The achievable limits of structural ...
than a one-hit wonder. Falk, Dan Astronomy
... Army at its rocket-testing site in White Sands, New Mexico. One of his main tasks was to design ...
... Army at its rocket-testing site in White Sands, New Mexico. One of his main tasks was to design ...
Focus and pointing adjustments necessary for laser guide star
... The zenith angle and focal length of the telescope are well known. However, the sodium height value used in the calculation can seriously impact the quality of the resulting focus tracking curve used to position the FCS. An error in calculated sodium height will cause the FCS to be out of position ...
... The zenith angle and focal length of the telescope are well known. However, the sodium height value used in the calculation can seriously impact the quality of the resulting focus tracking curve used to position the FCS. An error in calculated sodium height will cause the FCS to be out of position ...
AO status and perspectives
... requirements of all the planned instruments using natural stars only, providing: In the Near (and Thermal) IR: • Sufficient sky coverage (10% at high Galactic Latitude in J band) • High Strehl ratio (with relatively faint reference stars) At shorter wavelengths (R, I): • Sufficient sky coverage at m ...
... requirements of all the planned instruments using natural stars only, providing: In the Near (and Thermal) IR: • Sufficient sky coverage (10% at high Galactic Latitude in J band) • High Strehl ratio (with relatively faint reference stars) At shorter wavelengths (R, I): • Sufficient sky coverage at m ...
Durham Research Online
... obscuration changes across the field of view. Our model includes the hexagonal pattern of the segmented mirrors, and telescope support structures (spiders), with a representative pupil function shown in Fig. 1. Our LGS asterism is arranged regularly on a circle, the diameter of which we investigate. ...
... obscuration changes across the field of view. Our model includes the hexagonal pattern of the segmented mirrors, and telescope support structures (spiders), with a representative pupil function shown in Fig. 1. Our LGS asterism is arranged regularly on a circle, the diameter of which we investigate. ...
Leica ScanStation P-Series HDR
... whole new set of issues. This means that when we talk about the size of the tank, a metre must mean the same thing for the instrument measuring the tank and the other instrument measuring the window. This might seem like an arcane point, but it is important enough for there to be a term for this – b ...
... whole new set of issues. This means that when we talk about the size of the tank, a metre must mean the same thing for the instrument measuring the tank and the other instrument measuring the window. This might seem like an arcane point, but it is important enough for there to be a term for this – b ...
Measurements of large optical surfaces with a laser tracker
... Surface measurements represent a significant part of the cost for manufacturing large aspheric optics. Both polished and rough ground surfaces must be measured with high precision and spatial resolution. We have developed a system that couples a commercial laser tracker with an advanced calibration ...
... Surface measurements represent a significant part of the cost for manufacturing large aspheric optics. Both polished and rough ground surfaces must be measured with high precision and spatial resolution. We have developed a system that couples a commercial laser tracker with an advanced calibration ...
VisionCare Ophthalmic Technologies, Inc. 14395 Saratoga Avenue
... it was before developing the complications that necessitated transplant surgery1. Vision Loss. Your vision may get worse. The risk of losing more than 2 lines of vision on the eye chart was about 11% over the 5 years following intraocular surgery and about 27% at 8 years after surgery. Also, 48% of ...
... it was before developing the complications that necessitated transplant surgery1. Vision Loss. Your vision may get worse. The risk of losing more than 2 lines of vision on the eye chart was about 11% over the 5 years following intraocular surgery and about 27% at 8 years after surgery. Also, 48% of ...
Untitled - Cambridge University Library
... of actions, beginning early in 1666, that were both easy to perform and straightforward to repeat. But Newton was being disingenuous both in terms of historical detail and with reference to the ease with which another might see what he had seen. Accounts in one of Newton’s notebooks (see catalogue n ...
... of actions, beginning early in 1666, that were both easy to perform and straightforward to repeat. But Newton was being disingenuous both in terms of historical detail and with reference to the ease with which another might see what he had seen. Accounts in one of Newton’s notebooks (see catalogue n ...
Slide 1
... A quarter century ago, IRAS gave us this view of the center of the Milky Way in Infrared Light ...
... A quarter century ago, IRAS gave us this view of the center of the Milky Way in Infrared Light ...
PowerPoint
... Electrons orbit the nucleus of each atom (a little like planets around the Sun) The nucleus consists of protons and neutrons Number of protons = number of electrons (so total charge is ...
... Electrons orbit the nucleus of each atom (a little like planets around the Sun) The nucleus consists of protons and neutrons Number of protons = number of electrons (so total charge is ...
TERMS USED IN MANIPULATING A TRANSIT VERNIER
... circle to the right of the observer ,if originally it is to the left , and vice – versa. It is done in two steps; Firstly revolve the telescope through 1800 in a vertical plane and then rotate it through 1800 in the horizontal plane i.e first transit the telescope and then ...
... circle to the right of the observer ,if originally it is to the left , and vice – versa. It is done in two steps; Firstly revolve the telescope through 1800 in a vertical plane and then rotate it through 1800 in the horizontal plane i.e first transit the telescope and then ...
Spike: AI Scheduling for Hubble Space Telescope After 18 Months
... ing constraints, and maximizing preferencesthat help ensure a particular mode.A recent changeto the HSTgroundsysthat observationsare madeat optimal times. Spikehas been tems nowpermits the scheduling of two instruments for in use operationallyfor HSTsince shortly after the observa- simultaneousopera ...
... ing constraints, and maximizing preferencesthat help ensure a particular mode.A recent changeto the HSTgroundsysthat observationsare madeat optimal times. Spikehas been tems nowpermits the scheduling of two instruments for in use operationallyfor HSTsince shortly after the observa- simultaneousopera ...
User`s Manual (Updated 9
... the APD to destroy itself. Therefore, it is essential to avoid exposing the APDs to very bright light, e.g. direct sunlight, moon, stars brighter than 7th magnitude, flat lamps, etc. If you can see it with the unaided eye it is too bright for the APDs. The WTTM’s APD modules are select units that ha ...
... the APD to destroy itself. Therefore, it is essential to avoid exposing the APDs to very bright light, e.g. direct sunlight, moon, stars brighter than 7th magnitude, flat lamps, etc. If you can see it with the unaided eye it is too bright for the APDs. The WTTM’s APD modules are select units that ha ...
“Measuring surface slope error on precision aspheres,” in Optical
... physical diameters, lengths or widths of opaque objects. These objects can be as small as fiber optic cables, and as large as lumber, steel bar or large castings. The object passes through the cavity between the confocal parabolas. A linear array then detects the edges of the object being measured. ...
... physical diameters, lengths or widths of opaque objects. These objects can be as small as fiber optic cables, and as large as lumber, steel bar or large castings. The object passes through the cavity between the confocal parabolas. A linear array then detects the edges of the object being measured. ...
Very Large Telescope
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.