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
Bibliography
References
In the Measurement and Control
Standardization
French Standards Association AFNOR
- Proximity switches – Requirements for proximity switches with analog output. - NF EN 50319 - Déc. 1999
- Low-voltage switchgear – Part 5-2: Control circuit devices and switching elements – Proximity switches Constituted by : NF EN 60947-5-2:199903 (C63-147), NF EN 60947-5-2/A1:199912 (C63-147/A1). - NF EN 60947-5-2 - Déc. 1999
- Low-voltage switchgear – Part 5-3: Control...
Main manufacturers
Farrand Controls : http://www.ruhle.com/index.htm
Heidenhain : https://www.heidenhain.fr/
Midori America Corp: http://www.midoriamerica.com/index.html
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