Borescope, Measuring, CCD
Wednesday, August 30, 2006
The Measuring Borescope has been designed and developed using a probe, a micro processor and a monitor to measure objects observed by a CCD. A laser light beam at the probe tip projects a cone of light that illuminates the CCD’s field of view. A mask over the laser light source creates a linear shadow on the surface struck by the laser light beam. The position of the shadow on a surface changes with the object surface distance and the object surface orientation, relative to the laser light source.
The laser light beam shadow provides the micro processor with the information it requires to calculate the distance and angle of the objects relative to the probe tip. The data analysis of the signals calculates the geometry that provides object magnification, length, and depth.
An 85 degree field of view lens is used with the CCD camera resulting in image plane distortion. A software program corrects the image distortion, which
allows 90 percent of the total field of view to be correctly measured. Magnification of object and size of the object influences measurement accuracy. An error of less than 2 percent is achievable (claimed).
Source: Welch Allyn, Inc, Skaneateles Falls, NY
Reference: Michael Stone, Ray Lia, and Jon Salvati, Welch Allyn, Ph: 1-315-685-4109
Industrial Products
posted by JD52 @ 8:18 PM,
