Airy points

Airy points

Airy points are used for precision measurement to support a length standard in such a way as to minimize bending or droop. The points are symmetrically arranged around the centre of the length standard and are separated by a distance equal to 5/9ths of the total length of the measuring device.

Airy points are normally identified by inscribed marks or lines. For example, a 450 mm length gauge would have an Airy point separation of 450 mm times 5/9 = 250 mm. A line or pair of lines would be marked onto the gauge 100 mm in from each end. Supporting the artifact at these points ensures that the calibrated length is preserved. If the length gauge is not supported at the Airy points, the measurement uncertainty is increased.

ee also

* Conversion of units
* Detection limit
* Differential linearity
* Dimensional analysis
* Dimensionless number
* Econometrics
* History of measurement
* Instrumentation
* Levels of measurement
* Measurement in quantum mechanics
* Orders of magnitude
* Psychometrics
* Statistics
* Systems of measurement
* Test method
* Timeline of temperature and pressure measurement technology
* Timeline of time measurement technology
* Units of measurement
* Uncertainty principle
* Uncertainty in measurement
* Virtual instrumentation
* Weights and measures

References

*Smith, S. T. and D. G. Chetwynd. 1994. "Developments in Nanotechnology Vol. 2: Foundations of Ultraprecision Mechanism Design". Taylor & Francis. p. 323 of 364. ISBN 9782884490016
*Phelps, F. M. 1966. "Airy Points of a Meter Bar". Amer. J. Physics 34(5): 419-422.


Wikimedia Foundation. 2010.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • Mount Airy Casino Resort — Location Mount Pocono, PA, USA Address 44 Woodland Rd. Mount Pocono, PA 08401 Opening date 2007 Theme Pocono Mountain No. of rooms 188 (163 rooms, 25 suites) …   Wikipedia

  • Measurement — For bust/waist/hip measurement, see BWH. A typical tape measure with both metric and US units and two US pennies for comparison Measurement is the process or the result of determining the ratio of a physical quantity, such as a length, time,… …   Wikipedia

  • History of measurement — Units of measurement were among the earliest tools invented by humans. Primitive societies needed rudimentary measures for many tasks: constructing dwellings of an appropriate size and shape, fashioning clothing, or bartering food or raw… …   Wikipedia

  • optics — /op tiks/, n. (used with a sing. v.) the branch of physical science that deals with the properties and phenomena of both visible and invisible light and with vision. [1605 15; < ML optica < Gk optiká, n. use of neut. pl. of OPTIKÓS; see OPTIC,… …   Universalium

  • Pendulum — This article is about pendulums. For other uses, see Pendulum (disambiguation). Simple gravity pendulum model assumes no friction or air resistance …   Wikipedia

  • Optical resolution — This article is about optical resolution in optics. For the method of separating enantiomers in chemistry, see Chiral resolution. Optical resolution describes the ability of an imaging system to resolve detail in the object that is being imaged.… …   Wikipedia

  • Radar automatique en France — Pour les autres articles nationaux, voir Radar automatique. Cet article couvre le concept de radar automatique en France, dénommé dans les textes officiels « Contrôle sanction automatisé ». Sommaire 1 Histoire …   Wikipédia en Français

  • De L'ellipsoïde Au Géoïde — Cet article décrit sommairement les progrès de la géodésie dans le cadre plus large des sciences physiques au cours du XIXe et de la première moitié du XXe siècle, jusqu à l arrivée des satellites artificiels et la naissance de la géodésie… …   Wikipédia en Français

  • De l'ellipsoide au geoide — De l ellipsoïde au géoïde Cet article décrit sommairement les progrès de la géodésie dans le cadre plus large des sciences physiques au cours du XIXe et de la première moitié du XXe siècle, jusqu à l arrivée des satellites artificiels et la… …   Wikipédia en Français

  • De l'ellipsoïde au géoïde — Cet article décrit sommairement les progrès de la géodésie dans le cadre plus large des sciences physiques au cours du XIXe et de la première moitié du XXe siècle, jusqu à l arrivée des satellites artificiels et la naissance de la géodésie… …   Wikipédia en Français

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”