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Title: Process for sensing defects on a smooth cylindrical interior surface in tubing

Abstract

The cylindrical interior surface of small diameter metal tubing is optically inspected to determine surface roughness by passing a slightly divergent light beam to illuminate the entire interior surface of the tubing. Impingement of the input light beam components on any rough spots on the interior surface generates forward and backward scattered radiation components. The forward scattered components can be measured by blocking direct and specular radiation components exiting the tubing while allowing the forward scattered radiation to travel past the blocking location. Collecting optics are employed to converge the forward scattered radiation onto a photodetector generating a signal indicative of surface roughness. In the back scattered mode, back scattered radiation exiting the tubing through the entrance opening is reflected 90.degree. by a beam splitter towards collecting optics and a photodetector. Alternatively, back scattered radiation can be transmitted through a fiber optic bundle towards the collecting optics. The input light beam can be supplied through a white light fiber optic bundle mounted coaxial with the first bundle.

Inventors:
 [1]
  1. 7010 Weld Co. Rd. 1, Longmont, CO 80501
Issue Date:
Research Org.:
Rockwell International Corp., Canoga Park, CA (United States)
OSTI Identifier:
866426
Patent Number(s):
4707132
Application Number:
06/762,370
Assignee:
Dutton, G. Wayne (7010 Weld Co. Rd. 1, Longmont, CO 80501)
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:  
AC04-76DP03533
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
process; sensing; defects; smooth; cylindrical; interior; surface; tubing; diameter; metal; optically; inspected; determine; roughness; passing; slightly; divergent; light; beam; illuminate; entire; impingement; input; components; spots; generates; forward; backward; scattered; radiation; measured; blocking; direct; specular; exiting; allowing; travel; past; location; collecting; optics; employed; converge; photodetector; generating; signal; indicative; mode; entrance; reflected; 90; degree; splitter; towards; alternatively; transmitted; fiber; optic; bundle; supplied; white; mounted; coaxial; optic bundle; input light; beam splitter; fiber optic; light beam; interior surface; signal indicative; white light; surface roughness; scattered radiation; metal tubing; beam components; entire interior; determine surface; mounted coaxial; cylindrical interior; /356/

Citation Formats

Dutton, G Wayne. Process for sensing defects on a smooth cylindrical interior surface in tubing. United States: N. p., 1987. Web.
Dutton, G Wayne. Process for sensing defects on a smooth cylindrical interior surface in tubing. United States.
Dutton, G Wayne. Tue . "Process for sensing defects on a smooth cylindrical interior surface in tubing". United States. https://www.osti.gov/servlets/purl/866426.
@article{osti_866426,
title = {Process for sensing defects on a smooth cylindrical interior surface in tubing},
author = {Dutton, G Wayne},
abstractNote = {The cylindrical interior surface of small diameter metal tubing is optically inspected to determine surface roughness by passing a slightly divergent light beam to illuminate the entire interior surface of the tubing. Impingement of the input light beam components on any rough spots on the interior surface generates forward and backward scattered radiation components. The forward scattered components can be measured by blocking direct and specular radiation components exiting the tubing while allowing the forward scattered radiation to travel past the blocking location. Collecting optics are employed to converge the forward scattered radiation onto a photodetector generating a signal indicative of surface roughness. In the back scattered mode, back scattered radiation exiting the tubing through the entrance opening is reflected 90.degree. by a beam splitter towards collecting optics and a photodetector. Alternatively, back scattered radiation can be transmitted through a fiber optic bundle towards the collecting optics. The input light beam can be supplied through a white light fiber optic bundle mounted coaxial with the first bundle.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1987},
month = {11}
}

Patent:

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