| 词条 | Wadsworth constant deviation system |
| 释义 |
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] Unrelated usesWadsworth constant is an axiom that a video is useful after a third of its duration. [6]References1. ^1 {{cite journal|last=Wadsworth|first=Frank L. O.|title=The Modern Spectroscope. IX. Fixed-Arm Spectroscopes.|url=https://books.google.com/books?id=AQHD6xPQYe4C&pg=PA835|ol=23382270M|journal=Astronomy and Astro-Physics|year=1894|volume=13|page=835}} {{Optics-stub}}2. ^1 {{cite journal|first1=Leslie|last1=Alnwick|first2=Amy|last2=Clark|first3=Patricia|last3=Debs|first4=Chris|last4=Franczek|title=Design and implementation of sensor systems for control of a closed-loop life support system|url=https://ntrs.nasa.gov/search.jsp?R=19900016181|date=1 December 1989|first5=Tom|last5=Good|first6=Pedro|last6=Rodrigues|accessdate=5 July 2015|id=NASA-CR-186675}} 3. ^{{cite journal | last1 = Gibbs | first1 = R. C. | last2 = Collins | first2 = J.R. | year = 1922 | title = Geometrical Proof for the Wadsworth Constant Deviation System | url = | journal = Physical Review | volume = 19 | issue = | page = 381 | doi=10.1103/physrev.19.381}} 4. ^George J . Zissis (1995). "Dispersive prisms and gratings" (pdf) in Michael Bass et al. (eds.) Handbook of Optics. Vol. 2, Ch. 5. McGraw Hill. 5. ^{{cite journal |last=Lund |first=H. |last2=Ward |first2=L. |year=1952 |title=The Spectral Emissivities of Iron, Nickel and Cobalt |journal=Proceedings of the Physical Society, Section B |volume=65 |issue=7 |pages=535–540 |bibcode=1952PPSB...65..535L}} 6. ^{{cite web | url = https://www.dailydot.com/upstream/wadsworth-constant-reddit | title = How the Wadsworth Constant will give you 50 percent more time}} 1 : Optical devices |
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