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aluminum mirror telescope

Guide to Silver Coating Mirrors vs. Aluminum Mirrors

Known as the Optical Telescope Assembly, this telescope’s optic system collects infrared, visible and ultraviolet light through the use of two mirrors. Each of these mirrors is coated with aluminum to provide optimal reflectivity.

Why did high quality mirrors use aluminum coatings instead

Telescope mirrors and other mirrors used by scientists telescopes regularly do use a silver coating. See for instance here . However, aluminum coating are the norm (certainly for the large primary mirrors deployed in telescopes) because of durability reasons.

Telescope mirrors and other mirrors used by scientists telescopes regularly do use a silver coating. See for instance here . However, aluminum coa.Best answer · 34Johannes makes a good point about durability. As a footnote, I'll add that aluminum has another nice property over silver, at least as far as your.22Dr Chuck mentioned one reason to avoid a rear surface mirror, but there are a few more. If the light goes through the glass, then you need to desi.11Also, regarding the front/back surface point, if the back of the mirror is surfaced, you need to get the right shape on each surface, rather than j.8Nobody has yet mentioned the one aspect of silver that the graph depicts. Silver absorbs strongly near 315 nm. If you were interested in UV light f.7It ain't necessarily so. Some large telescopes are using silver coatings. For example the Gemini telescopes ( Boccas et al. 2006 ). The reason for.2

ATM optical coating

Our coating is aluminum with silicon monoxide over-coating. In the last year more than half our work has been re-coating old telescope mirrors. Building a Telescope The program includes mirror testing methods, basic optics and wave theory of optics. The program is supplied on a CD disk which can be browsed with the Safari Browser, the Microsoft

aluminium telescope mirror - Beginners Forum (No

Aug 03, 2007· The aluminum coating on a glass mirror is made using vaporized aluminum, which basically condenses on the glass surface. It's incredibly thin, so the smoothness comes from the glass itself. The aluminum enhances the reflectivity of the glass, rather than the glass supporting the aluminum.

Why aluminum instead of silver mirrors?Sep 14, 2014Good mirror coating companys?Jul 23, 2013Metal (Aluminium) primary mirror making?Dec 10, 2007Solid aluminum mirrorMar 14, 2006See more results
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Silver Coating on Large Telescope Mirrors Tutorial

aluminum. The Gemini Observatory was designed specifically to perform with a mirror that is coated in silver. From a research perspective there are many advantages to the use of silver on the primary, secondary, and tertiary mirrors. There are also many difficulties associated with a silver coating that are not present in aluminum coatings.

Metallic Mirror Coatings Edmund Optics

Metallic Mirror Coatings Edmund Optics® manufactures a wide range of precision parabolic, spherical, and flat mirrors with a number of different substrate materials. These products are offered in a variety of metallic and dielectric coatings to suit all your application requirements.

ALUMINUM COATING, - alcoat.net

We will not attempt to polish away the old coating even though polishing might increase the value of the mirror when it is not installed in a telescope. Limitation of Liability. There is no insurance on mirrors while they are in my custody. Mirrors are presumed to have the value of a typical amateur made mirror.

Silver Coated Mirrors vs. Aluminum Mirrors - Finishing

Silver Coated Mirrors vs. Aluminum Mirrors. A. Aluminum is a better reflector for certain wavelengths of light than silver. Aluminum will reflect much better from 1 nm wavelength to around 500 nm wavelength and has only marginally less reflectivity from 500 nm through the rest of the visible spectrum.

Telescope Mirrors & Prisms for sale eBay

Get the best deal for Telescope Mirrors & Prisms from the largest online selection at eBay. Browse your favorite brands affordable prices free shipping on many items.

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High reflectivity large scale telescope mirror coatings via

telescope applications.10,11 Previous aluminum sputtering tests have raised concerns about the broad angular distribution of long throw sputtering and its impact on Al mirror reflectivity, particularly at the annular joint of a coating, or “seam”, of a mirror coated in a circular fashion.12

Mirrors: Coating Choice Makes a Difference coatings

Metal mirror coatings. The simplest and most common mirror coating is a thin layer of metal. A 100-nm layer of aluminum or silver makes an excellent reflector for the visible spectrum. Aluminum reflects about 90 percent of the light across the visible spectrum, while silver reflects about 95 percent.

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High reflectivity large scale telescope mirror coatings via

factor for front surface reflectivity of sputtered aluminum. These results highlight the importance of water vapor pumping in telescope mirror coating vacuum chambers and indicate that long-throw sputtering is an economical and reliable technique for producing high uniformity, high reflectivity mirror coatings across large substrates.

How to Polish Aluminum to a Mirror Finish Our Pastimes

Wash the aluminum using a liquid dish detergent. This will remove any debris, which makes polishing the aluminum easier. Allow it to dry completely. Sand the aluminum using 320 grit sand paper. Wet the sandpaper and the aluminum and begin sanding. This is called wet sanding. Take your time and make sure that you sand the entire surface.

Space Oddities: Pure Aluminum Mirrors in Telescopes

May 14, 2010· I won't go to the other details of telescope construction cause some of the reader's noses are already bleeding now. Cited in the episode is an alternate way of constructing telescope mirrors. The mirror is made from a solid aluminum cylinder without using any glass at all.

Build a Backyard Dobsonian Telescope - Make: DIY Projects

Aug 28, 2015· 1. Construct the mirror cell. The core of the telescope, the steel mirror cell holds and adjusts the heavy, curved primary mirror. I welded mine from ¾” steel square tubing. A view of the bottom of the mirror cell with the primary mirror in place.

Stripping the Aluminum Coating from a Telescope Mirror

Click to view7:09

Feb 14, 2014· To prepare a mirror for refiguring, Gordon Waite shows how he removes the old reflective aluminum coatings. Gordon used ferric chloride to eat away the shiny aluminum without damaging the

Author: GordonWaite

Reflective Coating Services - Galaxy Optics

The large increase molecular energy is used to force a chemical reaction to near 100% completion at a lower temperature. The coating process for telescope optics involves the use of metal monoxide compounds as starting materials. The two most common for telescope optics are silicon monoxide (SiO) and titanium monoxide (TiO).

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Silver Coating on Large Telescope Mirrors Tutorial

chamber and sputtering devices need to work properly, and mirror surface needs to be free from contaminants. In general, the primary mirrors of large telescopes are coated with a thin film of aluminum. The Gemini Observatory was designed specifically to perform with a mirror

spectrum-coatings

Coatings. The leader in precision optical mirror coatings for telescopes and astronomy. Producing Front Surface Mirror coatings, Anti-Reflection, Beam splitter, hot & cold mirrors, dichroic filters that meet and exceed the standards of the optical thin film industry.

Stellafane ATM Coatings

Today, most amateur mirrors are coated in a high vacuum chamber where aluminum is evaporated, then as it flies about the chamber unimpeded by air molecules it evenly coats the mirror (and everything else in the chamber, including the viewport).

How to Clean Your Telescope Optics the Right Way Sky

Jul 27, 2006· Telescope Optics Care: Cleaning a Mirror. Undo the screws attaching the main mirror’s cell to the back end of the tube. Reach in the back and gently pull out the cell with the mirror inside it. Unscrew the clips holding the mirror in, and push the mirror out from the back without touching its

New mirror-coating technology promises dramatic

Sep 18, 2017· An aluminum-coated mirror lasts about three to five years before it needs recoating, a process that puts the telescope temporarily out of action. "We hate to lose telescope time, and we lose a lot of nights recoating segments at Keck," Phillips said.

Large Homemade Telescope Making Project

So, I decided to "star test" the mirror. Doing this, of course, would require the mirror be mounted inside a telescope tube. Building the Telescope Tube Since the mirror has a focal length of 113 inches (actually it's 113.13"), I decided that a truss telescope tube made from 8 aluminum poles and wood would be the most practical design.

Obsession Telescopes / Optics

A telescope mirror is designed to form a diffraction limited image of a point source. Ideally, a certain percentage of the light in the image will fall within the diffraction disk diameter. The Strehl ratio compares the mirror's actual performance in terms of its ability to

ALUMINUM COATING - ATM optical coating

The radius to the mirror is about 15 inches. If the aluminum goes equally in every direction then the four grams would be spread onto the inside of a sphere of radius 15 inches. The surface of a sphere equals Pi R2 times 4. 15 inches equals 38.1 centimeters.

Buy Telescope Mirrors - Official Website for JMI

BK7 is a barium borosilicate optical glass known for its high transmission and clean, clear appearance. It is by far the most common material for many optical glass applications, because it offers good optical properties and a reasonable price. It's used often as a standard of comparison for other glass materials.

Space Oddities: Pure Aluminum Mirrors in Telescopes

May 14, 2010· Cited in the episode is an alternate way of constructing telescope mirrors. The mirror is made from a solid aluminum cylinder without using any glass at all. This is achieved by using a computerized turning machine to cut the reflective side of the mirror.

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High reflectivity large scale telescope mirror coatings via

telescope applications.10,11 Previous aluminum sputtering tests have raised concerns about the broad angular distribution of long throw sputtering and its impact on Al mirror reflectivity, particularly at the annular joint of a coating, or “seam”, of a mirror coated in a circular fashion.12

aluminum telescope mirror - alibaba

There are 334 aluminum telescope mirror suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Singapore, and Taiwan, which supply 99%, 1%, and 1% of aluminum telescope mirror respectively.

The Telescope Mirror Coating - ATM optical coating

Aluminum coating is done by Aluminum Coating in a high vacuum tank. Aluminum metal is evaporated from a wire near the bottom of the tank and coats the mirror which is being rotated at the top of the tank. A very thin SiO transparent coating is coated over the aluminum coating. The mirror never becomes hot.

Optic Wave Laboratories - Optical Coatings

Coatings. Optic Wave Labs offers the services of its in-house coating facility to the public. We provide standard aluminum , semi-enhanced aluminum, enhanced aluminum, gold and silver coatings. Our automated deposition system can accommodate telescope mirrors up to 22 inches in diameter. We coat new mirrors as well as re-coat your existing mirror.

Obsession Telescopes / Optics

A telescope mirror is designed to form a diffraction limited image of a point source. Ideally, a certain percentage of the light in the image will fall within the diffraction disk diameter. The Strehl ratio compares the mirror's actual performance in terms of its ability to focus light into the diffraction disk, as predicted by interferometry, to the performance of a theoretically perfect mirror.

How to Clean Your Telescope Optics the Right Way Sky

Jul 27, 2006· Telescope Optics Care: Cleaning a Mirror. Undo the screws attaching the main mirror’s cell to the back end of the tube. Reach in the back and gently pull out the cell with the mirror inside it. Unscrew the clips holding the mirror in, and push the mirror out from the back without touching its

Reflecting telescope - Wikipedia

The primary mirror in most modern telescopes is composed of a solid glass cylinder whose front surface has been ground to a spherical or parabolic shape. A thin layer of aluminum is vacuum deposited onto the mirror, forming a highly reflective first surface mirror. Some telescopes use primary mirrors which are made differently.

Telescope Making Supplies - willbell

Aluminum oxide, like silicon carbide, is made in the electric furnace. Bauxite (aluminum ore), coke and powered iron are combined, heated, cooled, crushed, treated to produce a uniformly shaped particle and finally graded. This results in a nearly pure aluminum oxide crystal with a hardness of 9 on a Mohs scale.

Telescope Mirrors & Prisms for sale eBay

Get the best deal for Telescope Mirrors & Prisms from the largest online selection at eBay. Browse your favorite brands affordable prices free shipping on many items.

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Aluminum Alloy AA-6061 and RSA-6061 Heat Treatment for

Aluminum mirrors and telescopes can be built to perform well if the material is processed correctly and can be relatively low cost and short schedule. However, the difficulty of making high quality aluminum telescopes increases as the size increases, starting with uniform heat treatment through the thickness of large mirror substrates.

Orion 8879 1.25-Inch Enhanced Mirror Star Telescope Diagonal

Orion 8879 1.25-Inch Enhanced Mirror Star Telescope Diagonal Enhanced Aluminum mirror coatings yield 97% reflectivity for bright clear views Includes dustcaps for storage Save on Quality Tripod by AmazonBasics: AmazonBasics 60-Inch Lightweight Tripod with Bag, 2-Pack $40

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ALUMINUM COATING - ATM optical coating

The radius to the mirror is about 15 inches. If the aluminum goes equally in every direction then the four grams would be spread onto the inside of a sphere of radius 15 inches. The surface of a sphere equals Pi R2 times 4. 15 inches equals 38.1 centimeters.

The Telescope Mirror Coating - ATM optical coating

Aluminum coating is done by Aluminum Coating in a high vacuum tank. Aluminum metal is evaporated from a wire near the bottom of the tank and coats the mirror which is being rotated at the top of the tank. A very thin SiO transparent coating is coated over the aluminum coating. The mirror never becomes hot.

Custom Copper & Aluminum Mirror Design Shanghai Optics

Aluminum mirrors, on the other hand, work well for reflecting larger light wavelengths. NASA’s Hubble Space Telescope relies on an aluminum mirror to reflect not only visible light but ultraviolet light as well. These capabilities make aluminum the metal of choice for astronomers.

Build your own telescope part 1: The mirror Thomas

On the opposite, a shallow mirror (e.g. F/D = 8) will be performing very well on planets and the moon. The theory behind grinding is that you can remove glass as long as you use a material with a higher hardness. Telescope makers use silicon carbide powders (a.k.a. carborundum) for this task. It is cheap and comes in various size (can range from #36 to #500).

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Aluminum Mirror Coatings for UVOIR Telescope Optics

reflectivity and durability of aluminum mirrors in laboratory and pre-launch environments. Precisely controllable and scalable deposition process is also required to produce such coatings on large telescope mirrors. 2. BACKGROUND The main objectives are thus, a) to explore materials and processes to produce protective coatings for Al mirrors to

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Mirror Coatings for large aperture UV to IR Telescopes

• Protected Aluminum mirrors with ~75% reflectance at 110nm with long term stability have been produced • These mirrors currently show ~55% reflectance at 100nm

Telescope Making Supplies - willbell

Aluminum Oxide is slower cutting, ideal for softer flint, crown and low-expansion optical glasses. In its naturally occurring crystalline state, aluminum oxide, or corundum has been used as an abrasive for thousands of years. The purest, natural form is the gem-white sapphire.

How to Make Your Own Telescope Mirror - instructables

[Fig 6] Here is a photo that shows the tool being pressed against the warmed pitch. It is resting on my mirror with aluminum foil between the tool and mirror so it doesnt stick. After you make the tool you will need to cut some grooves in it. I used a saw blade to cut the grooves but there are several ways of

Large Homemade Telescope Making Project

So, I decided to "star test" the mirror. Doing this, of course, would require the mirror be mounted inside a telescope tube. Building the Telescope Tube Since the mirror has a focal length of 113 inches (actually it's 113.13"), I decided that a truss telescope tube made from 8 aluminum poles and wood would be the most practical design.

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Coating the 8-m Gemini telescopes with protected silver

The Gemini telescopes were designed to be infrared-optimized. Among the features specified for optimal performance is the use of silver-based coatings on the mirrors. The feasibility study contracted by Gemini in 1994-1995 provided both techniques and recipes to

Published in: Proceedings of SPIE · 2004Authors: Maxime Boccas · Tomislav Vucina · Claudio Araya · Esteban Vera · Clayton AhheeAbout: Coating · Sputtering · Infrared · Optical coating · Sputter deposition · Reflectivity
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Aluminum Alloy AA-6061 and RSA-6061 Heat Treatment for

Aluminum mirrors and telescopes can be built to perform well if the material is processed correctly and can be relatively low cost and short schedule. However, the difficulty of making high quality aluminum telescopes increases as the size increases, starting with uniform heat treatment through the thickness of large mirror substrates.

What are the best materials to use for a telescope mirror

Jan 19, 2016· Telescope mirrors in the modern era are usually made from glass covered by a thin metal film, usually aluminum. Glass is stable and can be polished to a high degree. The best glass for mirrors is likely to be one which has a very low coefficient.

Celestron 2" Starbright XLT Enhanced aluminum mirror

The diagonal uses an interferometer-tested 1/10th wave first-surface mirror for sharp, distortion-free images. The mirror housing is machined from solid aluminum, rather than simply a flimsy plastic box or a sheet metal stamping, as you'll find with ordinary diagonals.

Mirror - Wikipedia

A mirror, reflecting a vase. A first surface mirror coated with aluminum and enhanced with dielectric coatings. The angle of the incident light (represented by both the light in the mirror and the shadow behind it) exactly matches the angle of reflection (the reflected light shining on the table).