Development Of Shape Measurement System Research Articles

Development of shape measurement system combining Laser Range Finders with cameras for cylindrical object

Development of shape measurement system combining Laser Range Finders with cameras for cylindrical object

Development of Shape Measurement System Using Mirrors for Metallic Objects

Development of Shape Measurement System Using Mirrors for Metallic Objects

Development of Shape Measurement System for Edema

Lymphatic edema is the disease which is caused by the difficulty of lymphkinesis. By lymphokinetic disorder, lymph gradually accumulates in intracellular space, with continuous pain and fever. Accurate data acquisition needs high costs and large equipment, but a tape measure by doctors' hands provides less accurate results, because of tension variation. In order to overcome such problems, we developed a measurement system that can measure the shape of the limbs without contact by the light-section method.At first, we developed a shape of cross-section measurement system, which can measure the limbs smaller than 250mm in diameter, or 750mm in circumference. It consists of two line-lasers, two USB cameras, and several mirrors. Since a patient lies on bed, we cannot observe the part of the circumference, which contact the bed. The area was assumed to be flat. For other unobservable parts, the cubic spline interpolation was performed. In order to ensure the accuracy and the feasibility of usage, we prepared the models of 300, 500, 750mm in circumference. The result of the measurement showed that circumference error was smaller than 5mm, and it was usable. Hereafter we can move the device along a limb axis continuously and observe the shape of the limbs. It will give useful information for clinicians.

Development of shape measurement system using an omnidirectional sensor and light sectioning method with laser beam scanning for Hume pipes

A shape measurement system for Hume pipes (diameter 1200 to 2000 mm) is developed using an omnidirectional sensor and a light sectioning method with laser beam scanning to evaluate degradation of Hume pipes. This system can measure the inner wall shape of Hume pipes at high speeds (about 3000 distance measurement points within 3 s) and high accuracy while moving along the pipe axis, and it can evaluate the corrosion quantity of the pipe wall surface. To measure the 3-D shape, the system is developed using an omnidirectional imaging device combined with a laser beam for slit light projection, and a hyperbolic mirror and high-precision digital camera. Also, an algorithm is developed that calculates position coordinates of the camera optical axis and posture with the distance data from the camera optical axis to the pipe wall surface. Performance test results of the developed system have accuracy in a shape measurement of about 3 mm for distances of 400 to about 1600 mm.