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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)
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. 2002. "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 = {},
url = {https://www.osti.gov/biblio/874766}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2002},
month = {9}
}