A Twyman–Green interferometer is a variant of the Michelson interferometer principally used to test optical components.[1] It was introduced in 1918 by Frank Twyman[2][3] and Arthur Green.
Figure 1. Twyman-Green Interferometer.
Fig. 1 illustrates a Twyman–Green interferometer set up to test a lens. Light from a laser is expanded by a diverging lens (not shown), then is collimated into a parallel beam. A convex spherical mirror is positioned so that its center of curvature coincides with the focus of the lens being tested. The emergent beam is recorded by an imaging system for analysis.[4]
The fixed mirror in the Michelson interferometer is rotatable in the Twyman–Green interferometer, and while the light source is usually an extended source (although it can also be a laser) in a Michelson interferometer, the light source is always a point-like source in the Twyman–Green interferometer. The rotation of one mirror results in straight fringes appearing in the interference pattern, a fringing which is used to test the quality of optical components by observing changes in the fringe pattern when the component is placed in one arm of the interferometer.
Referencesedit
^Malacara, D. (2007). "Twyman–Green Interferometer". Optical Shop Testing. pp. 46–96. doi:10.1002/9780470135976.ch2. ISBN9780470135976.
^Menzies, A. C. (1960). "Frank Twyman. 1876-1959". Biographical Memoirs of Fellows of the Royal Society. 5. Royal Society publishing: 269–279. doi:10.1098/rsbm.1960.0020. ISSN 0080-4606.
^Twyman, F. (1921). "An interferometer for testing camera lenses". Transactions of the Optical Society. 22. IOP Publishing: 174–193. doi:10.1088/1475-4878/22/4/302.
^"Interferential Devices - Twyman-Green Interferometer". OPI - Optique pour l'Ingénieur. Retrieved 4 April 2012.
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twyman, green, interferometer, variant, michelson, interferometer, principally, used, test, optical, components, introduced, 1918, frank, twyman, arthur, green, figure, twyman, green, interferometer, illustrates, test, lens, light, from, laser, expanded, diver. A Twyman Green interferometer is a variant of the Michelson interferometer principally used to test optical components 1 It was introduced in 1918 by Frank Twyman 2 3 and Arthur Green Figure 1 Twyman Green Interferometer Fig 1 illustrates a Twyman Green interferometer set up to test a lens Light from a laser is expanded by a diverging lens not shown then is collimated into a parallel beam A convex spherical mirror is positioned so that its center of curvature coincides with the focus of the lens being tested The emergent beam is recorded by an imaging system for analysis 4 The fixed mirror in the Michelson interferometer is rotatable in the Twyman Green interferometer and while the light source is usually an extended source although it can also be a laser in a Michelson interferometer the light source is always a point like source in the Twyman Green interferometer The rotation of one mirror results in straight fringes appearing in the interference pattern a fringing which is used to test the quality of optical components by observing changes in the fringe pattern when the component is placed in one arm of the interferometer References edit Malacara D 2007 Twyman Green Interferometer Optical Shop Testing pp 46 96 doi 10 1002 9780470135976 ch2 ISBN 9780470135976 Menzies A C 1960 Frank Twyman 1876 1959 Biographical Memoirs of Fellows of the Royal Society 5 Royal Society publishing 269 279 doi 10 1098 rsbm 1960 0020 ISSN 0080 4606 Twyman F 1921 An interferometer for testing camera lenses Transactions of the Optical Society 22 IOP Publishing 174 193 doi 10 1088 1475 4878 22 4 302 Interferential Devices Twyman Green Interferometer OPI Optique pour l Ingenieur Retrieved 4 April 2012 nbsp This optics related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Twyman Green interferometer amp oldid 1213236857, wikipedia, wiki, book, books, library,
