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coordinate measuring technology stories

User Stories "coordinate measuring technology"

Precitec Optronik sensors use the interferometric and chromatic confocal measurement principles and can be found in many measuring machines, including those in the highest precision range. Optical sensors can also perform non-contact distance measurements unlike classical tactile sensor measuring machines; this eliminates the influence of contact forces, mass movements and damage to the measured part. 3D measurements are indispensable especially in the field of microsystems technology where precision parts have to be documented in three dimensions. Optical sensors are the ideal choice for this application enabling the detection of topographies of both shiny and transparent surfaces.

3D-COORDINATE METROLOGY IN MEDICINE

3D-ANALYSIS OF A FEMORAL KNEE COMPONENT

Endoprostheses with their sometimes very complex, multiply curved geometries would pose major problems for many traditional measuring machines

Dealing with endoprostheses requires the utmost care in production. Only very special 3D measuring systems are able to measure the surfaces with the required precision. To be successful distance sensors have to be moved very precisely, so that reliable measurements from freeform surfaces are possible. 

Chromatic confocal sensors are well suited to data acquisition as the high apertures ensure that even with highly inclined or highly reflective surfaces sufficient light is returned to the sensor. In most cases, it is the articulating surfaces of joint components that are measured. These are exactly the surfaces that may come in contact with the other surface during the possible movements of a joint. The gliding areas need to fit perfectly. This high surface quality of the contact surfaces of endoprostheses do not only shine, they are highly reflective, features that often cause competing scanning systems in considerable embarrassment. Non-contact scanning sensors from Precitec Optronik can measure these surfaces even if the slope-angles are very steep (+/- 30°).

Analysis of a femoral knee component

Aim is to measure roughness, topography and 3D shape with only one measurement. Manufacturers place a strong emphasis on 3D contour accuracy and surface quality. Artificial joints are known as medical devices of the highest risk category (III) along with heart valves and stents. They require quality assurance procedures which are not an end in itself, but vital: Currently, one out of ten of these operations are just used for a premature replacement of an endoprosthesis.

A contact-free sensor measures the ball of the hip joint after three and a half years of use. Different colors are used for the depth of the wear. Wear volume is 18 mm³. © RedLux Ltd
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