Bordon Pressure Tube Calibration

Application Type	Gauging
Image Characteristics	Monochrome; Good Contrast
Machine Vision Tool(s)	Pattern Matching; Caliper

The Bordon pressure tube inspection example demonstrates calibrating a Bordon pressure tube by measuring the distance between the base and the tip of the tube.

As pressure is applied to the Bordon tube, the tip of the tube extends outward. The calibration process involves correlating the computed distance from the image to the pressure applied to the Bordon tube.

Pattern Matching—Finds the tip of the Bordon pressure tube. A region containing the hole at the tip of the tube is used as the template. Because the template is rotationally symmetric, shift-invariant pattern matching is used to locate the tip. The Pattern Matching function finds the location of the tip and returns the pixel coordinates of the location.

Pattern Matching—Finds the base of the Bordon pressure tube. A region containing the hole at the base of the tube is used as the template. Because the template is rotationally symmetric, shift-invariant pattern matching is used to locate the base. The Pattern Matching function finds the location of the base and returns the pixel coordinates of the location.

Caliper—Uses the caliper tool to measure the distance between the locations of the tip and the base of the Bordon tube.