Microprocessor Control and Readout in Physics Experiments
Explore how microprocessors are used for control and readout in physics experiments. Learn about simple control mechanisms, feedback systems, and PID controllers. Discover practical examples and references for implementing PID control loops in various applications.
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Presentation Transcript
EP315 Microprocessors for Physicists Control Readout Physics Experiment
Simple control Decrease temp setting AC Room is Hot Feedback control Decrease temp setting AC Stop AC Room is cool comfortable 2/6
AC Measure Y C Room Desired Setting = R C P I D PROPORTIONAL Control Inject cool air (R Y) INTEGRAL Control Inject cool air (R Y)dt DERIVATIVE Control Inject cool air d(R Y)/dt 3/6
AC Measure Y C Room Desired Setting = R C PID controller applies correction u(t)based on past (integral), present (proportional) & future (derivative) Time constants these are determined by the time lag in response delay of the plant to a step function input in open loop mode. Ratios i/ delayand d/ delay Are determined by Zeigler-Nichols tuning. t ( ) de t = + + ( ) ( ) ( ) u t K e t K e t d K p I d dt t 0 1 ( ) de t 0 = + + ( ) ( ) ( ) u t K e t e t d or more useful in practice p d dt i 4/6
Domestic control example with PID feedback: Set and maintain the water level in a tank 5/6
References: http://dexautomation.com/ps/ : flash simulation of PID and many others Accompanying notes on Zeigler Nichols tuning of PID control loop parameters PracticalTechniquesForPIDTuning Lab 03 PID controller implementation! 6/6
