Linear capacitance measurement and touchless switch

Details Linear capacitance measurement and touchless switch Linear capacitance measurement and touchless switch

G - Physics

01

D

G01D 5/24 (2006.01) H03K 17/955 (2006.01)

Patent

CA 2658709

Capacitance measurement apparatus that enhances the sensitivity and accuracy of capacitive transducers, proximity sensors, and touchless switches. Each of two capacitors (C1, C2) under measurement has one end connected to ground and is kept at substantially the same voltage potential by operational amplifier (A1) or amplifiers (A0, A1) using negative feedback . The apparatus is driven by a periodic e.g. sinusoidal signal source (G1) or sources (G1, G2) and includes a difference amplifier (A2) operative to produce an electrical signal having a linear relationship with a specified arithmetic function of the capacitances of the two capacitors (C1, C2). A touchless switch is implemented using the capacitance measurement apparatus. The touchless switch includes two sensor electrodes (E1, E2) that correspond to the two capacitors (C1, C2) under measurement and in one embodiment has a front surface in the form of a container.

Affiliated with

Also associated with

Rating

Linear capacitance measurement and touchless switch does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Linear capacitance measurement and touchless switch, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Linear capacitance measurement and touchless switch will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1866381