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Mutual capacitance allows multi-touch operation where multiple fingers, palms or styli can be accurately tracked at the same time. [13] Self-capacitance sensors can have the same X-Y grid as mutual capacitance sensors, but the columns and rows operate independently. With self-capacitance, current senses the capacitive load of a finger on each ...
Capacitive displacement sensors share many similarities to eddy current (or inductive) displacement sensors; however capacitive sensors use an electric field as opposed to the magnetic field used by eddy current sensors [10] [11] This leads to a variety of differences between the two sensing technologies, with the most notable differences being ...
Keyence is a fabless manufacturing company that sells a broad range of products, from the photoelectric sensor and proximity sensors to measuring instruments for inspection lines to high precision microscopes used in research institutes.
The capacitance, , equals /, where is permeability, is the area of the sensor and is the distance between parallel plates. If the material is linearly elastic (so follows Hooks Law ), then the displacement, due to an applied force F {\displaystyle F} , is x = F / k {\displaystyle x=F/k} , where k {\displaystyle k} is the spring constant .
Capacitance sensors (or Dielectric sensors) use capacitance to measure the dielectric permittivity of a surrounding medium. The configuration is like the neutron probe where an access tube made of PVC is installed in the soil ; probes can also be modular (comb-like) and connected to a logger.
Eddy current sensors are displacement sensors that use the principle of eddy current formation to sense displacement. These sensors measure shaft displacement in rotating machinery and have been around for many years as they offer manufacturers high-linearity, high-speed measurements, and high resolution. [ 1 ]
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