WFPC2 has corrective figures on the relay secondary mirrors where the primary mirror is imaged; this optical correction recovers near-diffraction limited images over the entire CCD fields-of-view. Proper correction requires tight optical alignment tolerances, which are facilitated on-orbit by actuated optics. ... Alignment stability error . ... The optical design of WFPC2 creates an image of the OTA primary mirror near the surface of the relay Cassegrain secondary mirror in each of its channels. ...

RF/Fiber Optic WDM Transceiver AC231W Features Ї 2000 MHz Bandwidth Ї 1.3 or 1.5 ?m DFB Low Noise Laser Ї High Dynamic Range Ї WDM for bidirectional transmission Ї Internal Optical Isolator Ї Monitoring and Alarm Capability Ї Laser Disable Ї Singlemode Fiber Description The AC 231W is a linear, low noise RF fiber optic transceiver designed for fiber optic wireless systems and broadband RF applications. ... A laser and received optical power monitor and alarm is provided. ...

Program: MIRROR Purpose: Mirrors a two-dimensional image in x, y or both. It can also rotate the image over +90 or -90 degrees. Category: MANIPULATION File: mirror.c Author: K.G. Begeman Keywords: INSET= Set and subsets to mirror/rotate. ... BOX= Box to mirror [whole subset]. ... 1 Mirrors image around y axis, 2 around x axis and 3 around the centre op the box. Option 4 rotates the box +90 degrees and options 5 rotates the box -90 degrees. OUTSET= Set and subsets for the mirror images. ...

... The collecting area is increased by nesting concentric mirror pairs, all having the same focal length. ... Figure shows the largest optical element being ground at HDOS. ... X-ray testing demonstrated that the CXO mirrors are indeed the largest high-resolution X-ray optics ever made; the nominal effective area (based on the ground calibrations) is shown as a function of energy in the left panel of Figure , along with those of their Einstein and ROSAT predecessors. ...

The ESO Very Large Telescope consists of an array of four 8-meter telescopes which can work independently or in combined mode. ... In such a mount the telescope tube moves around a horizontal axis called elevation axis. ... The telescope tube itself consists of a steel structure supporting at the bottom the primary mirror (M1) in its cell, and at the top the M2 Unit by means of metallic beams called "spiders". ... The VLT can operate in either Cassegrain, Nasmyth or Coud focus. ...

Next: Acknowledgements Up: Echelle Reduction Previous: Instrument Description: CASPEC . The two following diagrams summarise the successive steps performed by high-level procedures RESPONSE/ECHELLE and REDUCE/ECHELLE depending on the main options: . Flat-field correction can be performed or not . Instrumental response correction can be skipped, or performed using either a standard-star or IUE-like methods. Figure: Response/Echelle . Figure: Reduce/Echelle (1) . ...

... Meta Index / Home Page / Description By default, an ARF will be created which has been corrected for the area lost by the gaps between CCDs and by bad pixels. ... The extendedsource option tells arfgen to produce the ARF relevant for an extended source. ... In practice, for an extended source the ARF has no correction for encircled energy, the mirror vignetting is averaged over the whole source area and area lost due to bad pixels and chip gaps is not convolved with the Point Spread Function (PSF). ...

... In the case of the 2.5-m telescope primary mirror, the support actuators are air pistons. The 48 axial and 18 transverse air pistons support the axial and transverse components of the mirror weight vector respectively. ... Piston force . ... To measure the response of an air piston to transverse forces, a transverse piston was loaded with 11 kg lead bricks and pressurized using a syringe (Figure 3). ... Figure 4: The air piston acts like a spring with hysteresis in response to a side force. ...

... Image Quality of the VLT . Total Optical Control . First light for the ESO VLT unit telescope 1 occurred during the workshop. ... The image shown (Figure 1 ) here was obtained with the VLT on May 16, 1998, in red light (R band), i.e. while the mirror was still uncoated. ... In this diagram (FIgure 2), the measured image quality of the VLT UT1 astronomical images is plotted versus the ``seeing", as measured by the Seeing Monitor, a small telescope also located on top of the Paranal Mountain. ...

RSAA Home . GSAOI Home . ... Other Links . ... Control Software Links . Optics Links . Micro-Optics Links . ... Optical Materials Databases . ... Rockwell Science Center home page . ... Santa Barbara Research Center home page . ... CCD-World home page . ... SDSU home page . ... EPICS home page . ... Optics Society of America . SPIE - Society for Optical Engineering . ... ZEMAX software (Focus Software page) . OPTICAD software (Focus Software page) . ... RedHat home page . ...

... In laboratory the design and a manufacturing techniques mirror aspherical optics are developed ("fokon", ellipsoid, aspherical mirror).Such optical elements are made of widespread aluminium alloys on the standard equipment without use diamond turning. ... Using: optical blocks of not image optical devices for transitions, collimation, focus (concentration) radiations in a wide spectral range from UV to IR. Focusing and collimation of light; . ... circle aperture/ring aperture; . ... Back Forward . ...

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Celestron Forum Message . Forums: . ... Collector Plate Replacement . ... I contacted Celestron and they told me that it would cost $500 plus shipping for replacement.. ... The unfortunate fact is that the corrector, primary mirror and secondary mirror on each individual scope is a matched set. ... www.astronomy.net . About Astronomy Net | ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

The overall efficiency (including atmospheric transmission, reflectivity of the telescope mirrors and overall efficiency of the optics and of the detector) for broad-band imaging should be about 25% in H and K, and about 15% in J. The main noise source for both broad- and narrow-band imaging should be the photon noise associated to the background+source flux. ... Flat fielding (and possibly background subtraction) might increase the noise by a factor 2 ? ...

Next: To produce a region Up: Image Display in Xwindows Previous: General usage. ... Menu items are chosen by clicking any mouse button (cf. ... save current cursor as an include region (counts within region will be included in subsequent calculations) . ... When another image is displayed, the earlier one can be compared with it by pressing its respective mouse button with cursor in the main display window. ... Table 1: Detailed list of menu options . ... color . ... enter/leave region sub-menu . ...

... Class . ... FRAMES NO FRAMES All Classes . ... FIELD | CONSTR | METHOD . DETAIL: FIELD | ... java.lang.Object ij.plugin.Options . ... PlugIn . public class Options . ... This plugin implements most of the commands in the Edit/Options sub-menu. ... This method is called when the plugin is loaded. Methods inherited from class java.lang.Object . ... This method is called when the plugin is loaded. 'arg', which may be blank, is the argument specified for this plugin in IJ_Props.txt. ...

... In some cases where memory space is at a premium, it is possible to tailor the configuration to remove such features as reference clock driver support, debugging support, and so forth. ... The following lines are used in this file: . ... The DEFS_LOCAL line defines global flags that apply to all machines. Ordinarily, the only flags included are the -DDEBUG , which includes the debugging code, and -DREFCLOCK , which includes basic reference clock support. ... D_INCLUDE_BSD_SOURCE . ...

Next: C Standard Library Functions Up: Common C Compiler Options Previous: Common C Compiler Options . c Suppress linking with ld(1) and produce a .o file for each source file. A single object file can be named explicitly using the -o option. ... Sends the output to the standard output, or to a file named with the -o option. Includes the cpp line numbering information. ... When this option is given, the -O and -R options are suppressed. -help Display helpful information about compiler. ...

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. Options modify the way that a command works. They usually consist of a hyphen followed by a single letter. For example the wc command counts the number of words, characters and lines in a file. By using a different option you can choose what is counted. wc -w file1 counts the words wc -c file1 counts the characters wc -l file1 counts the lines . Using multiple options .