Servo-controlled air pump for calibration of respiratory measurement systems.
We describe a servo-controlled piston pump driven by a stepping motor. The analogue controller is a single non-linear second-order feedback loop with adjustable speed and acceleration limits. This system, designed to simulate slowly-moving, active and non-linear systems, can be used as a low (0-6.5 litre s-1) flow volume generator in calibration procedures.
D002138:Calibration; D004582:Electronics, Medical / Q000295:instrumentation; D004867:Equipment Design; D012129:Respiratory Function Tests / Q000295:instrumentation*; D013147:Spirometry / Q000295:instrumentation