Improved Capacitive Proximity Detection for Conductive Objects through Target Profile Estimation

Figure 2

Electrode configuration for distance measurement. “T”: transmitter; “R”: receiver. (a) Four central electrodes are shorted to each other to form the transmitter, and all the rest electrodes are connected to work as the receiver. The generated capacitor is C₀. (b) Cross-section view of the electric field formed by the electrode matrix. The larger the spatial wavelength (), the farther the electric field penetrates to the space and the longer the detection range can be achieved.

(a)

(b)