“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. ...
8. Adaptive Optics
... transmission loss with respect to the telescope. In that case, the field stabilization corrector is not controlled by the AO system. ...
... transmission loss with respect to the telescope. In that case, the field stabilization corrector is not controlled by the AO system. ...
Alternative Beam Splitter/Compensator Configurations for Reduction
... using the Michelson interferometer have been in development since the 1950s. 1 The fundamentals of these techniques were well documented in the 1970 Aspen International Conference on Fourier Spectroscopy.2 The conventional Fourier Transform Spectrometer (FTS) splits incoming electromagnetic radiatio ...
... using the Michelson interferometer have been in development since the 1950s. 1 The fundamentals of these techniques were well documented in the 1970 Aspen International Conference on Fourier Spectroscopy.2 The conventional Fourier Transform Spectrometer (FTS) splits incoming electromagnetic radiatio ...
Orion® StarShoot™ AutoGuider inStructiOn MAnuAl
... Figure 2. Adjustable guide scope tube rings allow you to adjust the position of the guide scope without moving the main imaging scope. Because of the high resolution and accuracy of the SSAG, you do not need a large guide scope; any small refractor will serve well for this purpose. Separate refracto ...
... Figure 2. Adjustable guide scope tube rings allow you to adjust the position of the guide scope without moving the main imaging scope. Because of the high resolution and accuracy of the SSAG, you do not need a large guide scope; any small refractor will serve well for this purpose. Separate refracto ...
The US Air Force Academy Falcon Telescope Network
... purpose, objects of interest include satellites, astronomical research, and STEM support images. The raw imagery, all in the public domain, will be accessible to FTN partners and will be archived at USAFA in the Cadet Space Operations Center. FTN users will be able to submit observational requests v ...
... purpose, objects of interest include satellites, astronomical research, and STEM support images. The raw imagery, all in the public domain, will be accessible to FTN partners and will be archived at USAFA in the Cadet Space Operations Center. FTN users will be able to submit observational requests v ...
Meade® Illuminated Reticle Eyepiece Systems
... 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 separations, position angles, planetary diameters, and lunar crat ...
... 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 separations, position angles, planetary diameters, and lunar crat ...
Additive manufacturing and high resolution X-ray optics
... Case study 2: Michael Sweeney et al. ‘Application and Testing of Additive Manufacturing for Mirrors and ...
... Case study 2: Michael Sweeney et al. ‘Application and Testing of Additive Manufacturing for Mirrors and ...
LTCS Modifications Preliminary Design
... new design approach. Note that the LTCS design document has become stale and partially incorrect for the existing design. Some additional work to update the document for NGAO use is anticipated. LTCS is completely data driven, eliminating the requirement to have dedicated telescope and laser time fo ...
... new design approach. Note that the LTCS design document has become stale and partially incorrect for the existing design. Some additional work to update the document for NGAO use is anticipated. LTCS is completely data driven, eliminating the requirement to have dedicated telescope and laser time fo ...
Nano-Accuracy Surface Figure Metrology of Precision Optics
... Precision optical surface figure measurement is the most important aspect for optical systems development of telescopes, microscopes, cameras and imaging or focusing systems. Any optical surface slope error or surface figure error departure from the theoretical surface will produce beam deviations a ...
... Precision optical surface figure measurement is the most important aspect for optical systems development of telescopes, microscopes, cameras and imaging or focusing systems. Any optical surface slope error or surface figure error departure from the theoretical surface will produce beam deviations a ...
Camera and focal reducer Hyades comparisons
... Figure 2 below, is achieved with the “classic” focal reduction system developed by Scotty Degenhardt for the mighty mini. But it can be used effectively on any telescope that takes 1.25” eyepieces. The parts are illustrated well at http://www.asteroidoccultation.com/observations/NA/CameraAttachments ...
... Figure 2 below, is achieved with the “classic” focal reduction system developed by Scotty Degenhardt for the mighty mini. But it can be used effectively on any telescope that takes 1.25” eyepieces. The parts are illustrated well at http://www.asteroidoccultation.com/observations/NA/CameraAttachments ...
The Ages of Astrophotography - Powered by Catchers of the Light
... upon it with different degrees of intensity. Thus it is found that red rays, or the common sunbeams passed through red glass, have very little action upon it: Yellow and green are more efficacious, but blue and violet light produce the most decided and powerful effects.” Thomas Wedgwood’s original e ...
... upon it with different degrees of intensity. Thus it is found that red rays, or the common sunbeams passed through red glass, have very little action upon it: Yellow and green are more efficacious, but blue and violet light produce the most decided and powerful effects.” Thomas Wedgwood’s original e ...
The Sextant - Shipofficer.com
... the observer can sight the horizon or other object through the glass. The glass has two screws on the back for adjustments. The first screw, on the glass side, is used to adjust the perpendicular error. The second screw, on the back of the mirror side, is used to adjust the index error. ...
... the observer can sight the horizon or other object through the glass. The glass has two screws on the back for adjustments. The first screw, on the glass side, is used to adjust the perpendicular error. The second screw, on the back of the mirror side, is used to adjust the index error. ...
spherical aberration
... 4: Kershner RM. Retinal image contrast and functional visual performance with aspheric, silicone, and acrylic intraocular lenses. Prospective evaluation. J Cataract Refract Surg. 2003 Sep;29(9):1684-94. ...
... 4: Kershner RM. Retinal image contrast and functional visual performance with aspheric, silicone, and acrylic intraocular lenses. Prospective evaluation. J Cataract Refract Surg. 2003 Sep;29(9):1684-94. ...
spherical aberration
... 4: Kershner RM. Retinal image contrast and functional visual performance with aspheric, silicone, and acrylic intraocular lenses. Prospective evaluation. J Cataract Refract Surg. 2003 Sep;29(9):1684-94. ...
... 4: Kershner RM. Retinal image contrast and functional visual performance with aspheric, silicone, and acrylic intraocular lenses. Prospective evaluation. J Cataract Refract Surg. 2003 Sep;29(9):1684-94. ...
AO status and perspectives
... 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 moderate Strehl (~ 0.2, Nirvana) • Seeing reduction on “wide” field (~ 2 arcmin) o ...
... 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 moderate Strehl (~ 0.2, Nirvana) • Seeing reduction on “wide” field (~ 2 arcmin) o ...
The GMT Consortium Large Earth Finder Sagi Ben-Ami Smithsonian Astrophysical Observatory
... Smithsonian Astrophysical Observatory ...
... Smithsonian Astrophysical Observatory ...
Angle-of-arrival anemometry by means of a large
... the power law of telescopic and interferometric AOA spectra should be the same. In this paper, we use Clifford’s heuristic argument as a working hypothesis and interpret our telescopic AOA spectra on the basis of his theory [5] of spherical-wave AOA spectra observed with a two-point interferometer. ...
... the power law of telescopic and interferometric AOA spectra should be the same. In this paper, we use Clifford’s heuristic argument as a working hypothesis and interpret our telescopic AOA spectra on the basis of his theory [5] of spherical-wave AOA spectra observed with a two-point interferometer. ...
Chapter Ⅳ Plane Surface and Prism 第四章 平面镜和棱镜 §4.1
... ⑶ As there are now two mirrors in system, it is necessary to add two more, this is done by use of amici roof prism (roof right-angle prism). *Dove prism is mounted ahead of the object because it must be used in paralleled light. ...
... ⑶ As there are now two mirrors in system, it is necessary to add two more, this is done by use of amici roof prism (roof right-angle prism). *Dove prism is mounted ahead of the object because it must be used in paralleled light. ...
- IRSA
... heating is needed to raise the IRS detector arrays to their required operating temperatures. This function is provided by a small heater and temperature sensor co-mounted with the detector assembly which is thermally isolated from the FPMA by a fiberglass box structure. The design requirements and t ...
... heating is needed to raise the IRS detector arrays to their required operating temperatures. This function is provided by a small heater and temperature sensor co-mounted with the detector assembly which is thermally isolated from the FPMA by a fiberglass box structure. The design requirements and t ...
PDF
... The X-ray study of pulsars continued with launch of the ROSAT in 1990 (Trümper 1983). Its large collecting area and high spatial resolution allowed detection of synchrotron nebulae, all with linear size of a few parsecs, around several Galactic radio pulsars, including PSRs B1706−44, B1951+32, and ...
... The X-ray study of pulsars continued with launch of the ROSAT in 1990 (Trümper 1983). Its large collecting area and high spatial resolution allowed detection of synchrotron nebulae, all with linear size of a few parsecs, around several Galactic radio pulsars, including PSRs B1706−44, B1951+32, and ...
Aberrations
... I am given the job of measuring the position of the first zero of the image of the point source formed using an optical system having a central obscuration. As part of the job, I need to calculate the theoretical position of the first zero. Let e = diameter of central obscuration divided by diameter ...
... I am given the job of measuring the position of the first zero of the image of the point source formed using an optical system having a central obscuration. As part of the job, I need to calculate the theoretical position of the first zero. Let e = diameter of central obscuration divided by diameter ...
Reflecting telescope
A reflecting telescope (also called a reflector) is an optical telescope which uses a single or combination of curved mirrors that reflect light and form an image. The reflecting telescope was invented in the 17th century as an alternative to the refracting telescope which, at that time, was a design that suffered from severe chromatic aberration. Although reflecting telescopes produce other types of optical aberrations, it is a design that allows for very large diameter objectives. Almost all of the major telescopes used in astronomy research are reflectors. Reflecting telescopes come in many design variations and may employ extra optical elements to improve image quality or place the image in a mechanically advantageous position. Since reflecting telescopes use mirrors, the design is sometimes referred to as a ""catoptric"" telescope.