• 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.
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