Mirror Big

Mirror Big
Mirror Big

why large telescope mirrors are made from many mirrors sepirate?

can not build a plane mirror? why they should build great little mirrors mirror? Why "A large concave mirror is difficult to produce"

The first two answers not too bad, but they are not really good either. The answer is that the compound mirrors, composed of many segments, solving a series of engineering problems. First up, consisting of mirrors can be made to deform (in thousandths of an inch) that can be used to compensate for atmospheric turbulence. Secondly, sections of composite mirror need not complete the tensions a giant mirror, so you can make much thinner and lighter, without losing its curvature calculated very fine (in wavelengths of light). Third, lightweight mirrors, turn to resolve some important issues closely related to the management of a large telescope that is, you need a mirror that can be mounted on a heavy structure without causing one end to give a lot of the other end, making the alignment mirror (high school) to go fly Large Telescope images of clarity. For example, a bridge and skyscrapers are actually designed to bend a little, while the lens of a telescope is rigidity. It is harder to do with thousands of tons of glass at one end and very little on the other, and a telescope, the light is easier to move the telescope to different parts of the sky with great precision. This is a tricky business, because the telescope pointing to different parts of the sky and the arm "leverage" or leverage can cause different stress levels greatly depending on location where the telescope is pointed. Fourth, the lighter, thinner mirrors have less total mass (by definition) of a giant mirror solid which affects their thermal management. When a telescope mirror has a temperature that is different from air boundary layer is formed which affect the performance (negative). When a mirror is big and solid, its temperature can be easily adjusted to match the outdoor temperature at which it is exposed in the night sky (like a swimming pool in northern climates may take several weeks to warm the temperature can be used in summer). Thermal management is one of the least appreciated problem in using the telescope, even fans face these problems with their scopes of 4 to 30 inches (10 to 70 cm). It is easier to change the temperature of a thin mirror telescope in the same way is easier to change the temperature a bath instead of a pool. Fifth, the preferred place of observatories is very high, very remote sites, as in Chile, if you look at pictures of trucks used to make the 200-inch Hale telescope at Palomar, and believes that mirrors modern dwarf, we can make a idea of the difficulties in moving a single mirror on a large mountain range. The main reason not to build a large mirror is the difficulty to ensure that all segments of the line to the right. But with new compounds and metals can get the kind of rigidity that can do it, and teams can make adjustments super-fine that were not possible when a mirror was a giant piece of glass. Consideration minor, is that a segmented mirror also has the advantage that if a segment is damaged can be replaced. In Texas, a disgruntled employee emptied his revolver in the primary mirror of the 107 "telescope at McDonald Observatory, which is not destroyed (who painted the black hole and maintained their use) but say if it were a segmented mirror of at least one new segment would have been an option. Hope that helps, GN

MCR Honey, This Mirror Isn't Big Enough For The Two Of Us

admin posted at 2010-1-8 Category: Mirrors

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