6. Sources of uncertainty related to sensor positioning
Displacement sensors are usually made up of a part linked to the fixed frame of reference and a part linked to the moving frame of reference (material element for contact sensors, immaterial for non-contact sensors).
The main sources of uncertainty are :
the positional errors Δx, Δy and Δz of the sensor body relative to the fixed reference frame ;
the misalignment α of the sensor body and measurement direction ;
misalignment β of the moving part (misalignment of the measuring axis with respect to the mounting faces of the transducer body for non-contact measuring systems);
the difference in position γ between the "ideal" contact point and the actual contact point on the target, taking into account the radius of curvature...
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Sources of uncertainty related to sensor positioning
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