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Title: Laser diffraction process and apparatus for width measurement of elongated objects

Abstract

Size distribution of elongated objects is measured by forward scattering radiation from the objects at a range of scatter angles. The scattered radiation is refracted to locations on a scatter detector based on the scatter angles and independent of the location of the objects along the radiation axis. The intensity of radiation is sensed at each position on the scatter detector, and signals representative of the intensities at the positions are processed and compared to masks to identify a size distribution. The scatter detector may include individual radiation detectors arranged to receive refracted radiation representing respective ranges of scatter angles to thereby compensate for lower radiation intensities scattered from smaller objects.

Inventors:
;
Issue Date:
Research Org.:
Powerscope Incorporated, Minneapolis, MN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1175819
Patent Number(s):
7072051
Application Number:
10/413,675
Assignee:
Powerscope Incorporated (Minneapolis, MN)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
G - PHYSICS G01 - MEASURING G01B - MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS
DOE Contract Number:  
FC36-02GO12063
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

Naqwi, Amir A., and Fandrey, Christopher W.. Laser diffraction process and apparatus for width measurement of elongated objects. United States: N. p., 2006. Web.
Naqwi, Amir A., & Fandrey, Christopher W.. Laser diffraction process and apparatus for width measurement of elongated objects. United States.
Naqwi, Amir A., and Fandrey, Christopher W.. Tue . "Laser diffraction process and apparatus for width measurement of elongated objects". United States. https://www.osti.gov/servlets/purl/1175819.
@article{osti_1175819,
title = {Laser diffraction process and apparatus for width measurement of elongated objects},
author = {Naqwi, Amir A. and Fandrey, Christopher W.},
abstractNote = {Size distribution of elongated objects is measured by forward scattering radiation from the objects at a range of scatter angles. The scattered radiation is refracted to locations on a scatter detector based on the scatter angles and independent of the location of the objects along the radiation axis. The intensity of radiation is sensed at each position on the scatter detector, and signals representative of the intensities at the positions are processed and compared to masks to identify a size distribution. The scatter detector may include individual radiation detectors arranged to receive refracted radiation representing respective ranges of scatter angles to thereby compensate for lower radiation intensities scattered from smaller objects.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2006},
month = {7}
}

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Works referenced in this record:

Fibre sizing using Fraunhofer diffraction
journal, September 1978