Physics:Wadsworth constant deviation system
In optics, Wadsworth's constant-deviation prism-mirror system (or Wadsworth constant deviation mounting) is a method to arrange a prism or diffraction grating and a mirror on a turntable to ensure that rays of light emerge in a fixed direction.[1] Typically, light entering via a slit is directed into the prism by a lens. A particular wavelength can be chosen for analysis by setting the angle of the prism, and hence the part of the spectrum that exits by a mirror and lens combination. Rotating the prism through its entire range of motion enables the entire spectrum to be analyzed.[2] An analytical proof for the arrangement was given by Wadsworth,[1] followed almost three decades later with a geometric proof by Gibbs and Collins.[3] It is considered a "classic" prism configuration being versatile on its own or in combination with many other configuration and instrumentation combinations.[4]
Among many other applications, Wadsworth constant deviation mountings have been used to study light emissions from excited metal atoms,[5] and to study the light needs of plants in future space missions.[2]
References
- ↑ 1.0 1.1 Wadsworth, Frank L. O. (1894). "The Modern Spectroscope. IX. Fixed-Arm Spectroscopes.". Astronomy and Astro-Physics 13: 835. https://books.google.com/books?id=AQHD6xPQYe4C&pg=PA835.
- ↑ 2.0 2.1 Alnwick, Leslie; Clark, Amy; Debs, Patricia; Franczek, Chris; Good, Tom; Rodrigues, Pedro (1 December 1989). Design and implementation of sensor systems for control of a closed-loop life support system. NASA-CR-186675. https://ntrs.nasa.gov/search.jsp?R=19900016181. Retrieved 5 July 2015.
- ↑ Gibbs, R. C.; Collins, J.R. (1922). "Geometrical Proof for the Wadsworth Constant Deviation System". Physical Review 19 (4): 381. doi:10.1103/physrev.19.381. https://zenodo.org/record/1432468.
- ↑ George J . Zissis (1995). "Dispersive prisms and gratings" (pdf) in Michael Bass et al. (eds.) Handbook of Optics. Vol. 2, Ch. 5. McGraw Hill.
- ↑ Lund, H.; Ward, L. (1952). "The Spectral Emissivities of Iron, Nickel and Cobalt". Proceedings of the Physical Society, Section B 65 (7): 535–540. doi:10.1088/0370-1301/65/7/309. Bibcode: 1952PPSB...65..535L.
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