skip to main content
DOE Patents title logo U.S. Department of Energy
Office of Scientific and Technical Information

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. 6 figs.

Inventors:
Issue Date:
OSTI Identifier:
7255496
Patent Number(s):
4707132 A
Application Number:
PPN: US 6-762370
Assignee:
PTO; EDB-94-125150
DOE Contract Number:  
AC04-76DP03533
Resource Type:
Patent
Resource Relation:
Patent File Date: 5 Aug 1985
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; TUBES; DEFECTS; NONDESTRUCTIVE TESTING; INSPECTION; MEASURING METHODS; OPTICAL EQUIPMENT; VISIBLE RADIATION; ELECTROMAGNETIC RADIATION; EQUIPMENT; MATERIALS TESTING; RADIATIONS; TESTING; 420500* - Engineering- Materials Testing

Citation Formats

Dutton, G.W. Process for sensing defects on a smooth cylindrical interior surface in tubing. United States: N. p., 1987. Web.
Dutton, G.W. Process for sensing defects on a smooth cylindrical interior surface in tubing. United States.
Dutton, G.W. Tue . "Process for sensing defects on a smooth cylindrical interior surface in tubing". United States.
@article{osti_7255496,
title = {Process for sensing defects on a smooth cylindrical interior surface in tubing},
author = {Dutton, G.W.},
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. 6 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1987},
month = {11}
}