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How many types of capacitance sensors are there?
There are two types of capacitive sensing system: mutual capacitance, where the object (finger, conductive stylus) alters the mutual coupling between row and column electrodes, which are scanned sequentially; and self- or absolute capacitance where the object (such as a finger) loads the sensor or increases the …
What does capacitive sensor measure?
Capacitive sensors are designed for non-contact measurement of displacement, distance and position, as well as for thickness measurement. Due to their high signal stability and resolution, capacitive displacement sensors are applied in laboratories and industrial measurement tasks.
How is the operating distance of a capacitive sensor determined?
The operating distance of the sensor depends on the actuator shape and size and is strictly linked to the nature of the material. Capacitive proximity sensors use an electrostatic field to detect the variation of capacitance between the sensor and the object being detected.
What are the differences between capacitive and inductive sensors?
Both inductive and capacitive sensors have two types of mounting: flush and non-flush. The mounting method may differ depending on the sensor model. The way in which the sensors are mounted in the application has an influence on its detection range and the moment when an object is detected.
What can a capacitive proximity sensor be used for?
Capacitive proximity sensors can be used to detect and count non-metallic objects such as glass, paper, cardboard, plastic or wood. This is possible because the sensor can detect more than one type of material unlike the inductive proximity switch.
How are eddy current sensors different from capacitive sensors?
Eddy-current sensors are sensitive to material differences and must be calibrated to the application’s target material. When using multiple probes, capacitive sensors must be synchronized, but can be mounted close together without interference.