Endoscope, Shear, Camera
Tuesday, September 05, 2006
The Shear Endoscope Camera has been designed and developed that can be placed outside the specimen area with the objective end of the borescope inserted through the wall of a pressure vessel for internal inspection. The Camera and borescope and specimen material can be rotated between inspections to provide full radial or azimuth image detection. The Camera and borescope and the specimen material can be translated between inspections to provide full axial detection.
A pair of borescopes, one for imaging and one for illumination, are positioned parallel to each other. The telephoto lens of a Shear Camera can be replaced with a side view rigid borescope. The borescope uses relay lenses and a mirror to image the specimen material thru the objective lens on the borescope tip to the viewing lens of the eyepiece.
In the illumination borescope an integrated Fiber Optic bundle provides the illumination path, with light entering through the pistol-grip hand and exiting adjacent to the objective lens on the borescope tip. A ‘C’ mount adapter is used to provide mechanical stability between the adapter and interferometer and optical coupling of the imaging light beam. A light guide is used to couple the unexpanded laser light beam to the fiber optic bundle light guide, which is integrated internal to the borescope.
The unexpanded laser light beam enters the eyepiece of the illumination borescope, passes through a series of relay lenses, and is imaged to the borescope objective. The unexpanded laser light beam exits the borescope objective and passes through a lens pair, causing the laser light beam to diverge. The distance between the lens pair elements may be adjusted to increase or decrease the beam divergence to fit the appropriate field of view. The expanding beam illuminates the surface of the sample and is then collected by the objective lens of the imaging borescope. The coherent image passes through a series of relay lenses and is imaged to the borescope eyepiece. The ‘C’ mount adapter relays this image to the interferometer for image processing.
Source: “Endoscopic shearography inspection” by Samuel S. Russell and Mattew D. Lansing, NASA Tech Briefs, April 1998, MFS-26494; Samuel S. Russell, Marshall Space Flight Center; Matthew D. Lansing, University of Alabama, Huntsville Research Institute, Huntsville, Alabama
Reference: None Available
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posted by JD52 @ 9:51 PM,
