Capacitive Sensors of Digital Calipers

The digital caliper is very economical and high precision measuring tools. In generally, it has a resolution of 10 µm with an accuracy of 30 to 40 µm. With the usage of the multiplate capacitive sensors the digital calipers can achieve high performance and cost efficiency .

It is very rugged and simple to build capacitive sensors, and they are highly linear and immune to mechanical and electronic noise. However, the digital calipers are sensitive to liquids since they rely on capacitance. Any liquid that bridges the capacitive plates increases the capacitance. A drop of oil can increase the capacitance by a factor of 80!