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#11
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A different optical telescope
"odin" wrote in message ... The only reason I can see for going to a larger diameter is to look at longer wavelength information. Google on "Arecibo radio telescope". The amount of light an objective mirror gathers (aka "light gathering power") http://www.twcac.org/Tutorials/lightgathering_power.htm is roughly proportional to its area. More LGP means brighter images and/or shorter photographic exposures - equivalent to a 'fast' camera lens. Tom Davidson Richmond, VA |
#12
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A different optical telescope
"Lorem Ipsum" wrote in message ... "stone" wrote in message ... I suggest making a reflector optical telescope with a diameter of 100 yards or more. Instead of using a highly polished mirror, which is very expensive even for a small one, I suggest using the reflective surface of good quality aluminum foil Thousands of PhDs in optical engineering and this bloke comes out of the blue with something.... ah... I'm guessing the OP has never *heard* of optical engineering. This seems like the kind of question a clever middle-school student (or an imaginative high school student) with a limited exposure (pun) to basic physics or optics might ask. Tom Davidson Richmond, VA |
#13
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A different optical telescope
stone wrote in message ... I suggest making a reflector optical telescope with a diameter of 100 yards or more. Instead of using a highly polished mirror, which is very expensive even for a small one, I suggest using the reflective surface of good quality aluminum foil for the concave mirror to gather very much light and focus it to the focal point of the telescope. The aluminum foil can be glued to the surface of a plastic concave surface, that is manufactured in sections, and assembled with a hundred yard or more diameter. Aluminum supports can be used to hold this huge concave plastic structure. I know that the reflectivity of aluminum foil is not as good as a polished mirror, however I think that you could get a higher magnification image (that is clear enough) because of the much larger diameter of the reflector, which will gather much more light. A computer program could be designed to clean up the image, to make it clearer, if that seems to be necessary. Since the most expensive part of a reflector optical telescope is the polished mirror, this use of aluminum foil could allow for a much more powerful optical telescope with much less expence. The mechanics of moving this large reflector telescope and housing it are engineering problems that could be worked out. The way I see it, the main thing to think about is cost. They probably will never grind a mirror big enough for the Owl telescope [Proposed by the OSO - 100 meters in diameter and at least 10 years away if it is ever built ]. And the weight of it would be tremendous. Experiment with the aluminum foil and plastic and glue. Find out what works and what don't. Build a smaller version first to see if it is worth doing. A mirror is basically a polished silver surface behind glass. Maybe a clear varnish could be put on top of the aluminum foil instead of glass. This would help hold it smooth. Note: The aluminum frame holding the large plastic dish could be adjustable at varying points to change the shape of it slightly to adjust it to varying temperatures. Also minor imperfections might not be a problem because they are such a small percentage of the total area of the concave surface. (An imperfection that might make a keck telescope useless, might not have any appreciable effect on the image from a mirror 100 yards or more in diameter because the imperfection is such a small percentage of the total mirror surface area.) I suggested using a higher quality aluminum foil which does reflect better than what is available to the public. Possibly could be achieved by alowing the molten aluminum to cool off differently at the factory. __________________________________________________ _____________________________ Posted Via Uncensored-News.Com - Accounts Starting At $6.95 - http://www.uncensored-news.com The Worlds Uncensored News Source |
#14
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A different optical telescope
Hay Stone, you missed it totaly, the OWL telescope will NOT, I repeat NOT
have ONE mirror. Much like the other big scopes that have been built in the last few years, their mirror is made up of MULTI-Mirrors, with each mirror having a push/pull device behind it and a computer running all of them so that any changes in the air around them is transfered to the mirrors and the image is kept sharp and if the money is rasied, they will build it and it would be one awesome scope. Oh ya, the next grand space telescope which is being worked on will have multi-mirrors that will make up the main mirror. In a nut shell, you tin foil mirror would be only good for setting fires, not for viewing stars. Take a look at the group of 24inch scopes up on Mt.Wilsome above L.A.Calif. they are all tied together and combined, they have the seeing of a 300 inch mirror, yet they are up to 1/4 mile apart. -- The Lone Sidewalk Astronomer of Rosamond Telescope Buyers FAQ http://home.inreach.com/starlord Astronomy Net Online Gift Shop http://www.cafepress.com/astronomy_net In Garden Online Gift Shop http://www.cafepress.com/ingarden Blast Off Online Gift Shop http://www.cafepress.com/starlords "stone" wrote in message ... The way I see it, the main thing to think about is cost. They probably will never grind a mirror big enough for the Owl telescope [Proposed by the OSO - 100 meters in diameter and at least 10 years away if it is ever built ]. And the weight of it would be tremendous. |
#15
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A different optical telescope
Starlord wrote in message ... Hay Stone, you missed it totaly, the OWL telescope will NOT, I repeat NOT have ONE mirror. Much like the other big scopes that have been built in the last few years, their mirror is made up of MULTI-Mirrors, with each mirror having a push/pull device behind it and a computer running all of them so that any changes in the air around them is transfered to the mirrors and the image is kept sharp and if the money is rasied, they will build it and it would be one awesome scope. Oh ya, the next grand space telescope which is being worked on will have multi-mirrors that will make up the main mirror. In a nut shell, you tin foil mirror would be only good for setting fires, not for viewing stars. Any multi mirror rig is going to have serious distortion, even if you use computers to try to compensate. A one big mirror with higher quality aluminum foil could even have less overall distortion just because it is one mirror. Thousands of little mirrors will have distortion where one mirror starts and another stops. I am suggesting: Very smooth plastic, like on a football helmet, shaped into a big concave dish, 100 yards in diameter, supported by adjustable aluminum supports [with turnable sleeves for adjusting the length of the aluminum pipes], with a fine mist of glue holding a very smooth and highly polished aluminum foil onto the plastic to form one big concave mirror. Even though it is only aluminum foil, it could have less distortion than thousands of disconnected mirrors. All around each small individual mirror will be distortion in the spaces between mirrors. For thousands of small mirrors that adds up to alot of distortion. __________________________________________________ _____________________________ Posted Via Uncensored-News.Com - Accounts Starting At $6.95 - http://www.uncensored-news.com The Worlds Uncensored News Source |
#16
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A different optical telescope
Once more you have shown that you know NOTHING, because ALL of the big
scopes being built or already in operation have multi-mirrors and the images they are getting are even sharper than the Hunnle Space Telescope. You should really study the systems they now use ( have been for 10 years at lest ) that makes any changes in the air null and void and the computer system is running so fast that it samples the foucs and adjusts it 200 times a second. From the Multi-mirror scope on Kitt Peak to the Monstors that just went online ( 3 of them ) down in Chile on that high desert area, they ALL, I repeat ALL have the Multi-mirrors that make up ONE big mirror. And as stated before, the James Webb Space Telescope which will operate in the infered area of light will also have multi-mirrors, they will be folded up and once it has reached it's L1 orbit station it'll unfold them and have a full mirror bigger than even the HST. Why don't you build your scope out of CD's, it would be just as useless as your tin foil one. Oh ya, BTW, the OWL telescope will not only have a truly monster of a multi-part main mirror, but the secondary mirror will be made up of multi-mirrors too. Everytime you post, you show that you know nothing about the new breed of scopes, you should really check out some of the back issures of Sky & Telescope that show these systems and scopes. -- The Lone Sidewalk Astronomer of Rosamond Telescope Buyers FAQ http://home.inreach.com/starlord Astronomy Net Online Gift Shop http://www.cafepress.com/astronomy_net In Garden Online Gift Shop http://www.cafepress.com/ingarden Blast Off Online Gift Shop http://www.cafepress.com/starlords "stone" wrote in message ... Starlord wrote in message ... Hay Stone, you missed it totaly, the OWL telescope will NOT, I repeat NOT have ONE mirror. Much like the other big scopes that have been built in the last few years, their mirror is made up of MULTI-Mirrors, with each mirror having a push/pull device behind it and a computer running all of them so that any changes in the air around them is transfered to the mirrors and the image is kept sharp and if the money is rasied, they will build it and it would be one awesome scope. Oh ya, the next grand space telescope which is being worked on will have multi-mirrors that will make up the main mirror. In a nut shell, you tin foil mirror would be only good for setting fires, not for viewing stars. Any multi mirror rig is going to have serious distortion, even if you use computers to try to compensate. A one big mirror with higher quality aluminum foil could even have less overall distortion just because it is one mirror. Thousands of little mirrors will have distortion where one mirror starts and another stops. I am suggesting: Very smooth plastic, like on a football helmet, shaped into a big concave dish, 100 yards in diameter, supported by adjustable aluminum supports [with turnable sleeves for adjusting the length of the aluminum pipes], with a fine mist of glue holding a very smooth and highly polished aluminum foil onto the plastic to form one big concave mirror. Even though it is only aluminum foil, it could have less distortion than thousands of disconnected mirrors. All around each small individual mirror will be distortion in the spaces between mirrors. For thousands of small mirrors that adds up to alot of distortion. __________________________________________________ _____________________________ Posted Via Uncensored-News.Com - Accounts Starting At $6.95 - http://www.uncensored-news.com The Worlds Uncensored News Source |
#17
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A different optical telescope
stone wrote: snip repost Any multi mirror rig is going to have serious distortion, even if you use computers to try to compensate. A one big mirror with higher quality aluminum foil could even have less overall distortion just because it is one mirror. Thousands of little mirrors will have distortion where one mirror starts and another stops. I am suggesting: Very smooth plastic, like on a football helmet, shaped into a big concave dish, 100 yards in diameter, supported by adjustable aluminum supports [with turnable sleeves for adjusting the length of the aluminum pipes], with a fine mist of glue holding a very smooth and highly polished aluminum foil onto the plastic to form one big concave mirror. Even though it is only aluminum foil, it could have less distortion than thousands of disconnected mirrors. All around each small individual mirror will be distortion in the spaces between mirrors. For thousands of small mirrors that adds up to alot of distortion. Stone, you are repeating yourself and ignoring the fine information your original post has garnered in response. You evidently do not have sufficient understanding of the problems or the engineering involved to drive this idea home. It is time for you to stop spewing and start researching the current state of the art. The art of telescope making is hundreds of years old, but you sound like your understanding of it is only as deep as a Time magazine article. Since before Galileo people much smarter than you or I have been refining this art and recording their accumulated knowledge. Let them teach you something. The foil is better used for headgear: http://zapatopi.net/afdb/ Tom Davidson Richmond, VA |
#18
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A different optical telescope
"tadchem" wrote in message ups.com... The foil is better used for headgear: http://zapatopi.net/afdb/ Watch out, there is evidence that promoting use of foil headgear is a government plot! Do you work for the CIA? or NSA?? with a .mil address i would watch out about making recommendations like this, it could blow your cover! http://people.csail.mit.edu/rahimi/helmet/ |
#19
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A different optical telescope
"Dave" wrote in message ... | Watch out, there is evidence that promoting use of foil headgear is a | government plot! Do you work for the CIA? or NSA?? with a .mil address i | would watch out about making recommendations like this, it could blow your | cover! | http://people.csail.mit.edu/rahimi/helmet/ Shhh, don't tell anyone I told you this, but the foil hats actually increase the antenna needed for aliens to read the foil-head's brainwaves. lol |
#20
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A different optical telescope
"Dave" wrote in message ... "tadchem" wrote in message ups.com... The foil is better used for headgear: http://zapatopi.net/afdb/ Watch out, there is evidence that promoting use of foil headgear is a government plot! Most who sport foil headgear are trying to *defend* themselves from government plots. Do you work for the CIA? or NSA?? The Defense Logistics Agency (DLA) is responsible for providing our military with equipment, including Personal Protective Equipment (PPE). with a .mil address i would watch out about making recommendations like this, it could blow your cover! In the words of Snidely Whiplash, "Curses! Foiled again!" Tom Davidson Richmond, VA |
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