Transducer 09
Transducer 09 : Any of various devices that transmit energy from one system to another, sometimes one that converts the energy in form. For recording seismic ground motion the motion of the seismometer mass has to be transmitted either via a mechanical or optical lever system to the recorder (used in old classical seismographs) or to be converted into an equivalent electronic signal (as used in all modern seismometers). Transducers use different physical principles and devices such as coil-magnet systems, inductive bridges, capacity half-bridges, pieco-electric effects, interferometric-optical devices, etc. Accordingly, the output signal of the transducer may be proportional to ground displacement, velocity or acceleration
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