Sensor Interface for Multimodal Evaluation of Capacitive Sensors

Capacitive proximity sensing can be done in different modes. The single ended mode usually offers a higher signal to noise ratio (SNR) and – in conjunction with active guarding – high robustness. However, it can be blind for objects with low permittivity close to the sensor surface. The differential...

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Bibliographic Details
Published in:Journal of physics. Conference series 2013-01, Vol.450 (1), p.12018-5
Main Authors: Schlegl, Thomas, Zangl, Hubert
Format: Article
Language:English
Subjects:
Blinds
Circuits
Dielectric constant
Object recognition
Permittivity
Physics
Proximity
Robustness
Sensors
Signal to noise ratio
State of the art
Surface chemistry
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Summary:Capacitive proximity sensing can be done in different modes. The single ended mode usually offers a higher signal to noise ratio (SNR) and – in conjunction with active guarding – high robustness. However, it can be blind for objects with low permittivity close to the sensor surface. The differential mode usually has a worse SNR but has the capability to detect objects in situations where the single ended mode is blind. Thus, we propose a measurement circuitry to combine both modes. It is compared to state of the art sensors and the benefits of this approach are demonstrated by means of experimental investigations.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/450/1/012018