Subscribe free to our newsletters via your
. 24/7 Space News .

Low Stray Light Ellipsoidal Mirror Helps Push the Boundaries of Solar Research
by Staff Writers
Kenley, UK (SPX) Mar 04, 2013

File image.

Optical Surfaces Ltd. has supplied a 350mm diameter on-axis ellipsoidal mirror to the Kiepenheuer-Institut fur Sonnenphysik (KIS) in Freiberg, Germany.

The Kiepenheuer-Institut fur Sonnenphysik (KIS) is Germany's leading institute for solar research with ground based telescopes. It runs two telescopes on the island of Tenerife: the Vacuum Tower Telescope (VTT) which has an aperture of 0.7 m and the GREGOR telescope that has an aperture of 1.5 m.

Dr. Dirk Soltau, an Experimental Solar Physics Scientist with KIS commented "The VTT telescope is equipped with optics supplied by Optical Surfaces in the 1980's. When it came to the replacement of the GREGOR tertiary mirror in 2012 - Optical Surfaces Ltd. was again the successful bidder. The new GREGOR M3 is an elliptical mirror with two foci that was specified with particular emphasis on low stray light levels.

Drawing upon their depth of expertise and experience in producing demanding telescope optics - the on-axis ellipsoidal mirror supplied by Optical Surfaces surpassed our specifications and was successfully implemented on the GREGOR telescope in February 2013."

Dr Aris Kouris of Optical Surfaces Ltd commented "To achieve the demanding low stray light levels we chose to produce the GREGOR tertiary mirror in ClearCeram-z (HS). Using proprietary polishing techniques our skilled craftsmen were able to achieve a surface accuracy of nearly Lambda/17 P-V at 633nm, a surface quality of better than 20/10 and an ultra-smooth finish measured at less than 0.60nm RMS.

In addition, the "structure function" was measured at the request of KIS. The structure function is a logarithmic plot of the wavefront error as a function of the spatial frequency components.

In effect it describes the presence of individual spatial frequencies and their contribution to mirror's performance. The resulting function measured, although it followed the predicted theoretical trend, was significantly better than expected".

Optical Surfaces Ltd has been producing optical components and systems for more than 50 years and is now accepted as one of the world's leading manufacturers of high-precision optical systems for telescope and satellite based space observation systems.

The company's ISO 9001-2008 approved manufacturing workshops and test facilities are deep underground in a series of tunnels excavated in solid chalk where temperature remains constant and vibration is practically non-existent.

With such stable conditions testing, particularly with long path lengths, becomes quantifiable and reliable. Working with these natural advantages is a highly skilled team of craftsmen with a commitment to excellence in both product quality and customer service.


Related Links
Optical Surfaces
Solar Science News at SpaceDaily

Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks DiggDigg RedditReddit GoogleGoogle

Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News

NASA Deciphering the Mysterious Math of the Solar Wind
Greenbelt MD (SPX) Feb 27, 2013
Many areas of scientific research - Earth's weather, ocean currents, the outpouring of magnetic energy from the sun - require mapping out the large scale features of a complex system and its intricate details simultaneously. Describing such systems accurately, relies on numerous kinds of input, beginning with observations of the system, incorporating mathematical equations to approximate ... read more

China to use modified rocket for moon landing mission

Water On The Moon: It's Been There All Along

Building a lunar base with 3D printing

US, Europe team up for moon fly-by

Short Bump Gets Robotic Arm Closer to Rock Target

NASA fixing computer glitch on Mars Curiosity rover

Inspiration Mars to Pursue Human Mission to the Red Planet in 2018

Computer Swap on Curiosity Rover

Tech sector rides on rich list

Brazil inventor struggles to collect royalties

Stanford scientist closes in on a mystery that impedes space exploration

U.S. research to be free online

Welcome Aboard Shenzhou 10

Reshuffle for Tiangong

China to launch 20 spacecrafts in 2013

Mr Xi in Space

ESA's Columbus Biolab Facility

SpaceX set for third mission to space station

Record Number of Students Control ISS Camera

NASA briefly loses contact with space station

SpaceX's capsule arrives at ISS

Dragon Transporting Two ISS Experiments For AMES

SpaceX Optimistic Despite Dragon Capsule Mishap

'Faulty Ukrainian Parts' Blamed for Zenit Launch Failure

Scientists spot birth of giant planet

NASA's Kepler Mission Discovers Tiny Planet System

Kepler helps astronomers find tiny exo planet

Searching for a Pale Blue SPHERE in the Universe

SimCity rebuilt for modern life

Taiwan turns plastic junk into blankets, dolls

Fukushima raised cancer risk near plant: WHO

Ancient Egyptian pigment points to new security ink technology

The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement