Chapter 4. Overview of Measurement Systems

4.1. Transducers

Of most interest are the physical properties and performance characteristics of a transducer. Some examples are given in Tables 4.1 and 4.2.

Table 4.1. Physical properties
Property Method of measurement
Strain Strain gauge, a resistive transducer whose resistance changes with length
Temperature Resistance thermometer, thermocouple, thermistor, thermopile
Humidity Resistance change of hygroscopic material
Pressure Movement of the end of a coiled tube under pressure
Voltage Moving coil in a magnetic field
Radioactivity Electrical pulses resulting from ionization of gas at low pressure
Magnetic field Deflection of a current carrying wire
Table 4.2. Performance characteristics

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