Piezotransistor Accelerometer
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A piezotransistor accelerometer contains a stylus attached to a seismic mass. The sharp end of the stylus is in contact with the sensitive-to-stress area of the p-n junction of a transistor. The force developed due to the acceleration is transmitted to the stylus, whose sharp edge develops a concentrated stress in the semiconductor. The electrical characteristics of the transistor are changed, causing a change of the current in the electrical circuit.
Piezotransistor accelerometer. a = acceleration, B = base, C = collector, E = emitter, n = n-silicon, p = p-silicon, 1 = seismic mass, 2 = spring element, 3 = stylus,
4 = n-p-n planar transistor, 5 = case, 6 and 7 = leads.
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