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Title: Method and apparatus for making absolute range measurements

Abstract

This invention relates to a method and apparatus for making absolute distance or ranging measurements using Fresnel diffraction. The invention employs a source of electromagnetic radiation having a known wavelength or wavelength distribution, which sends a beam of electromagnetic radiation through a screen at least partially opaque at the wavelength. The screen has an aperture sized so as to produce a Fresnel diffraction pattern. A portion of the beam travels through the aperture to a detector spaced some distance from the screen. The detector detects the central intensity of the beam as well as a set of intensities displaced from a center of the aperture. The distance from the source to the target can then be calculated based upon the known wavelength, aperture radius, and beam intensity.

Inventors:
 [1];  [1];  [2];  [1]
  1. Knoxville, TN
  2. Oak Ridge, TN
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
874766
Patent Number(s):
6,456,383
Application Number:
09/705,847
Assignee:
UT Battelle, LLC (Oak Ridge, TN); The University of Tennessee Research Corporation (Knoxville, TN) ORNL
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; apparatus; absolute; range; measurements; relates; distance; ranging; fresnel; diffraction; employs; source; electromagnetic; radiation; wavelength; distribution; sends; beam; screen; partially; opaque; aperture; sized; produce; pattern; portion; travels; detector; spaced; detects; central; intensity; set; intensities; displaced; center; target; calculated; based; radius; electromagnetic radiation; diffraction pattern; /356/

Citation Formats

Earl, Dennis D, Allison, Stephen W, Cates, Michael R, and Sanders, Alvin J. Method and apparatus for making absolute range measurements. United States: N. p., 2002. Web.
Earl, Dennis D, Allison, Stephen W, Cates, Michael R, & Sanders, Alvin J. Method and apparatus for making absolute range measurements. United States.
Earl, Dennis D, Allison, Stephen W, Cates, Michael R, and Sanders, Alvin J. Tue . "Method and apparatus for making absolute range measurements". United States. https://www.osti.gov/servlets/purl/874766.
@article{osti_874766,
title = {Method and apparatus for making absolute range measurements},
author = {Earl, Dennis D and Allison, Stephen W and Cates, Michael R and Sanders, Alvin J},
abstractNote = {This invention relates to a method and apparatus for making absolute distance or ranging measurements using Fresnel diffraction. The invention employs a source of electromagnetic radiation having a known wavelength or wavelength distribution, which sends a beam of electromagnetic radiation through a screen at least partially opaque at the wavelength. The screen has an aperture sized so as to produce a Fresnel diffraction pattern. A portion of the beam travels through the aperture to a detector spaced some distance from the screen. The detector detects the central intensity of the beam as well as a set of intensities displaced from a center of the aperture. The distance from the source to the target can then be calculated based upon the known wavelength, aperture radius, and beam intensity.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Sep 24 00:00:00 EDT 2002},
month = {Tue Sep 24 00:00:00 EDT 2002}
}

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