Electron tunnel sensors

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Abstract
We have used the extreme sensitivity of electron tunneling to variations in electrode separation to construct a novel, compact displacement transducer. Electrostatic forces are used to control the separation between the tunneling electrodes, thereby eliminating the need for piezoelectric actuators. The entire structure is composed of micromachined silicon single crystals. Applications of the tunneling displacement transducer to the measurement of acceleration and infrared signals are discussed. Measurements of acceleration and infrared sensitivity are reported.

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