4

Resistive sensors

Abstract

The sensors presented in this chapter are all based on resistive effects: they behave as an electrical resistor whose resistance is affected by a particular physical quantity. Quantities that can be measured using resistive effects are temperature (thermistors and metal thermometers), light (light-dependent resistor), deformation (piezoresistors), and magnetic field strength (magnetoresistors). By a special construction or material choice, resistors can be made useful for sensing other quantities, for instance force, torque, pressure, distance, angle, velocity, and acceleration.

After a brief discussion on resistance and resistivity this chapter treats successively potentiometric sensors, strain gauges, and piezoresistive ...

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