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The proximity sensor of the Boppli device (1 – a first dielectric layer; 2 – a sensing electrode; 3 – an electrically conductive layer; 4 – the second dielectric layer; 5 – the housing; 6 – an adhesive; 7 – the surface of the sensing electrode; 8 – the first dielectric layer; a distance G separates the surface of the sensing electrode 2 from the electrically conductive layer). Diagram modified from reference (57).
