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autocollimator |
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autocollimator [¦ȯd·ō′käl·ə‚mād·ər] (optics) A device by which a single lens collimates diverging light from a slit, and then focuses the light on an exit slit after it has passed through a prism to a mirror and been reflected back through the prism. A telescope which has a graduated reticle, enabling an observer to read off the angles subtended by distant objects. A convex mirror at the focus of the principal mirror of a reflecting telescope, which causes light to leave the telescope in a parallel beam. A telescope equipped with an eyepiece designed for autocollimation. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| An autocollimator is used to transfer the level to a small, flat mirror probe on a leveling assembly. In an attempt to shed some light on these errors, we have compared autocollimator measurements to angle measurements made with a Fizeau phase-shifting interferometer. Using an autocollimator and a reference prism, this angle was measured with a statistical standard uncertainty of better than 1" and a combined standard uncertainty of [+ or -] 9". |
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