The QTC Ultra Sensor from Peratech is so sensitive it can be operated through glass or steel sheet. Quantum Tunnelling Composite material changes its resistance when pressure is applied, enabling it to be used to make pressure sensors that can respond to light touches even through steel or glass. The QTC Ultra Sensor only takes a deflection of a micron or so for QTC to sense the touch through the sheet.
QTC Ultra Sensor can either be fitted as a small piece of QTC sheeting or screen printed on the back of the steel plate as required by the product designer. The design works equally well with other materials such as plastics, glass, or wood provided that there is enough flex to activate the QTC switch. It can even be used behind translucent materials to create secret till lit buttons. QTC solutions are thinner, smaller, more discrete, less expensive and ultra-reliable as there is no air gap and no moving parts, making them well-suited for domestic, commercial and industrial equipment.
QTC material has nano-sized particles of conductive material evenly distributed in a non-conductive polymer. When a force is applied the particles move close enough for electrons to flow between the particles using an effect called Quantum Tunnelling. QTC technology has been used to make a switch only a few microns thick and can be made into any shape required or printed with whatever level of responsiveness to pressure that is needed.