23.5 SUMMARY

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Selection of continuous sensors must include issues such as accuracy and resolution.

Angular positions can be measured with potentiometers and encoders (more accurate).

Tachometers are useful for measuring angular velocity.

Linear positions can be measured with potentiometers (limited accuracy), LVDTs (limited range), moire fringes (high accuracy).

Accelerometers measure acceleration of masses.

Strain gauges and piezoelectric elements measure force.

Pressure can be measured indirectly with bellows and Bourdon tubes.

Flow rates can be measured with Venturi valves and pitot tubes.

Temperatures can be measured with RTDs, thermocouples, and thermistors.

Input signals can be single ended for more inputs or double ended for more accuracy.