Boots – shoes – and leggings
Patent
1985-08-21
1986-05-27
Chin, Gary
Boots, shoes, and leggings
356 355, 356360, 73800, G01B 1116
Patent
active
045919968
ABSTRACT:
A method and apparatus for measuring stress and strain associated with a pipe, pressurized vessel, structural member or deformable body containing a flaw or stress concentration utilizes a laser beam to illuminate a surface being analyzed and an optical data digitizer to sense a signal provided by the light beam reflected from the illuminated surface. One signal is received from the surface in a reference condition and subsequent signals are received from the surface after surface deformation. The optical data digitizer provides the received signal to an image processor, and the processor stores the signals and correlates the deformed image received with the reference image and then sends this correlated information to a minicomputer which performs mathematical analyses of the signal to determine stress and strain associated with the surface. The apparatus is constructed as one integral unit, and further includes a digital and tape display, as well as a television monitor and an electro-optic range indicator.
REFERENCES:
patent: 3828126 (1974-08-01), Ramsey, Jr.
patent: 3844659 (1974-10-01), Baganoff
patent: 3889053 (1975-06-01), Lloyd et al.
patent: 4018531 (1977-04-01), Leendertz
patent: 4195929 (1980-04-01), Raftopoulos et al.
patent: 4280764 (1981-07-01), Sica, Jr. et al.
patent: 4288852 (1981-09-01), Holland
patent: 4320462 (1982-03-01), Lund et al.
patent: 4322162 (1982-03-01), McKelvie et al.
patent: 4352565 (1982-10-01), Rowe et al.
"Noncontact Method of In-Plane Strain Measurement On Rotating Structures" by Preater; SPIE vol. 236, 1980, European Conference on Optical Sys. & Applications; pp. 58-62.
"Stress Analysis of In-Plane Vibration of 2-D Structure by a Laser Speckle Method" by Chiang et al., Applied Optics, vol. 19, No. 16, Aug. 15, 1980; pp. 2705-2708.
"The Design and Application of a Speckle Pattern Interferometer for Total Plane Strain Field Measurement" by Jones; Optics and Laser Tech. vol. 8, No. 5, Oct. 1976, pp. 215-219.
"Laser Speckle Photography and the Submicron Measurement of Surface Deformations on Engineering Structures" by Gregory; NDT International, vol. 12, No. 2, Apr. 1979, pp. 61-70.
Chin Gary
Jacobson Harvey B.
LandOfFree
Apparatus and method for determining stress and strain in pipes, does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and method for determining stress and strain in pipes,, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for determining stress and strain in pipes, will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1574716