Capacitive proximity sensor on robot arm detects nearby object via capacitive effect of object on frequency of oscillator. Sensing element part of oscillator circuit operating at about 20 kHz. Total capacitance between sensing element and ground constitutes tuning capacitance of oscillator. Sensor circuit includes shield driven by replica of alternating voltage applied to sensing element. Driven shield concentrates sensing electrostatic field in exterior region to enhance sensitivity to object. Sensitivity and dynamic range has corresponding 12-to-1 improvement.
Capacitive Proximity Sensor Has Longer Range
NASA Tech Briefs ; 16 , 8
1992-08-01
Miscellaneous
No indication
English
Steerable Capacitive Proximity Sensor
NTRS | 1994
|Steerable Capacitive Proximity Sensor
Online Contents | 1994