The Dobsonian typically utilizes an Alt Altazimuth mount, whereas general Reflectors make use of an Equatorial Mount.ĭespite the differences in the mounts, the optics and way they are designed are the exact same when you compare a Dobsonian to a Reflecting telescope. The only true difference is that just uses a different mount to your average Newtonian reflector. So what is the difference between a Dobsonian and a Reflector? Theoretically, a Dobsonian is a reflector. Two of the most popular types of telescopes are the Dobsonian and Reflector. This is why it is so crucial to conduct some research ahead of time and ensure you know what you need to get to observe what you want. When it comes to choosing a Telescope – there’s actually quite a few different styles and types to consider. Mirrors that were placed on the Chandra X-ray Observatory.If you’re looking to get into Astronomy, then there is quite a lot to take in, especially all of the different names and acronyms. Instead, gamma-ray detectors are used to record photons and reconstruct an image. Gamma rays have such high energies, that mirrors cannot be used to focus the radiation. The mirrors used on the Chandra X-ray Observatory are coated with iridium. The x-rays will then glance off of the coated (usually with gold or nickle) mirrors. The mirrors that focus x-rays are made to be almost parallel to the incoming rays. The high-energy photons like to penetrate mirrors instead of reflecting of of them. ![]() X-ray telescopes must use a different design than optical telescopes. Ultraviolet telescopes have primary mirrors which are coated with special materials that make it possible to reflect ultraviolet light. In much of the short-wavelength region of the electromagnetic spectrum, telescopes must be located in space, because the high-energy photons cannot penetrate the earth's atmosphere. Very Large Array radio observatory in New Mexico. This is called interferometry, and is the basis for the To increase resolving power, two or more radio telescopes, separated by large distances, can be used together to function as one huge radio telescope. Even though the Arecibo telescope is large, it cannot see an object with the detail (resolving power) that a large optical telescope can. The largest radio telescope dish, the Arecibo Observatory, is 305 meters (1,000 ft) across, and is located in Puerto Rico. In fact many radio telescope are composed of metal mesh. Because radio waves have a much longer wavelength than optical light, the large dishes do not have to be mirror-smooth. A large parabolic dish, with an antenna tuned to the desired frequency, is used to focus the incoming radio waves. Microwave and Radio telescopes have designs much like the reflecting optical telescopes. Infrared telescopes on the ground must be located in dry regions, to avoid the water vapor that absorbs this radiation.Ī part of the Very Large Array in New Mexico Infrared telescopes follow the same design as optical reflecting telescopes, but use an infrared light detector at the focus. It is better, to observe these phenomena from space. Some infrared wavelengths also get through, but water vapor absorbs much of the infrared radiation as well as microwave radiation coming from astronomical objects. In the long-wavelength region of the electromagnetic spectrum, radio waves pass easily through the earth's atmosphere. A well known optical telescope in space is the Hubble Space Telescope. Most optical telescopes are located on the ground (housed in domed observatories), but some are in space. Our eyes are detectors, but in astronomical studies an electronic device is often used instead. A secondary mirror (like the eyepiece lens of a refractor) is often used to channel the light rays to a detector. Reflecting telescopes make use of a primary concave mirror to gather light. The image formed is magnified for the viewer through an eyepeice lens at the back end of the tube. Refracting telescopes use convex lenses, at the front of a tube, to gather and focus incoming light. There are two basic kinds of optical (gathering visible light) telescopes. Telescope - an instrument used to gather light radiated from distant objects. ![]() ![]() Short-wavelength telescopes - ultraviolet, x-rays, and gamma rays Long-wavelength telescopes - infrared and radio waves Different telescopes for different wavelengths
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