By Larry K. Baxter
Capacitive sensors produce staggering answer of circulation to 1 half in 10-10 meters and keep unparalleled long term balance in opposed environments. they're more and more used for quite a few jobs in purchaser and business gear, together with wall stud sensors, keypads, lamp dimmers, micrometers, calipers, rotation encoders, and extra. the main centred, authoritative publication to be had within the box, Capacitive Sensors brings you whole details at the learn, layout, and construction of capacitive sensors. This all-in-one resource presents precise, complete insurance of key subject matters, together with underlying thought, electrode configuration, and functional circuits. moreover, you will find stories of a few confirmed platforms by no means sooner than released.
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Extra info for Capacitive Sensors - Design and Applications
_ , . . . . .. -. '~, . . . . Moving shield initial electrode configuration This represents a cross section of a shielded three-electrode structure used to measure the change of length of electrode 2 by measuring changes in C i3. As ground electrode 2 lengthens in the x axis from left to right, the capacitance between electrode 1 and 3 will be linearly decreased. To check how sensitive this structure is to spacing changes, we move electrode 2 in the y axis while leaving its x position unchanged.
I " " " motion . -. . • . I [ " ' . I . I ' . " '. • ~ . - . . _ i . . . . . . . . ,. • ,,, ° • - - . 4 , ~ . 35 . . . . . . . . _ , . . . . .. -. '~, . . . . Moving shield initial electrode configuration This represents a cross section of a shielded three-electrode structure used to measure the change of length of electrode 2 by measuring changes in C i3. As ground electrode 2 lengthens in the x axis from left to right, the capacitance between electrode 1 and 3 will be linearly decreased.
These applications all need specialized electrode configurations and circuit design. 1 ). (). 1 Singlcplate This assumes vacuum (or air) dielectric. With D in cm, C, the capacitance to an equivalent ground potential very far away, is in pF. 354 pF. As conductive objects approach the plate, this capacitance increases. 2). 2 Two parallel plates With dimensions in cm, and an air dielectric, C is in pF. 8 pF. This configuration is useful for measuring dielectric material properties and measuring motion, where either the spacing d is changed or the common area is changed by the transverse motion of one of the plates.
Capacitive Sensors - Design and Applications by Larry K. Baxter