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
| Static |
|---|
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