Aiming at the deficiency of current sampling gas flow control for porphyrin sensor gas detecting system
a flow control system with high precision
fast response and small overshoot is presented.The system adjusts the duty ratio of PWM pulse signal using increment PID algorithm
then it can change the amplitude of armature voltage for DC motor indirectly
so it can control sampling gas flow.The flow control precision is ±1.5 cm3/min
and gas flow can reach stability only in 15.6s with the help of the flow control system.The experimental results show that flow control of sampling gas is helpful to detect target gases accurately and quickly for the porphyrin sensor gas detection system.
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references
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