2 351 measurement systems, metrics

2 351 measurement systems, metrics - Source of Information...

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1 Source of Information The material presented this semester is substantially based on the (optional) textbook ( Figliola & Beasley ), and figures from the book have been used in lecture slides throughout the semester. If not attributed otherwise, figures were taken from the book. Introduction and Basic Concepts Underlying Question How can we obtain good (meaningful, correct) data?
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2 Experimental Testing, Continuation of Discussion Measurement Example In your group, come up with a hypothetical example of a measurement or set of measurements that you may need to make in your future. For this example, answer the following questions. 1. What is the purpose of the measurement? What will be done with the information that is obtained? 2. How accurate does your answer need to be? 3. What variables do you need to measure? 4. What equipment will you need? 5. What form will the signal from the instrument have? 6. What other variables could influence your result? 7. What control or calibration measurements might be needed? What is a control experiment? 8. How can you check whether your answer makes sense?
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3 Experimental Test Plans After completing the measurement, how can you check whether your answer makes sense ? Why is a reality check so important? 1. What value do you expect, approximately? 2. Can you perform a control experiment? 3. Are there comcomitant (= other, different ) methods of measuring the variable? kon- kom -i-t uh nnt Measurement Systems
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4 Measurement System Figure from Figliola & Beasley Sensor/Transducer Sensor physical element undergoing a natural/physical phenomenon Transducer converts sensed information into a detectable signal Example sensor: fluid that expands/contracts with temperature transducer: capillary part of thermometer Discussion Provide some other examples of sensors and transducers.
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5 Signal Conditioning, Output, Feedback Control Signal Conditioning Stage amplification, filtering, link to output Output Stage display, scale, recording device Feedback Control makes decisions based on measured signal, outputs a signal to control the measured process; not a major focus of this course. Example A house thermostat comprises a sensor, an output display showing temperature, and a feedback to the furnace/AC system. Discussion Provide some other examples of systems with feedback that you have seen. Cool Video Showing Feedback Control This video was produced by Mike Armani and Roland Probst, who at that time were students in the research group of Prof. Benjamin Shapiro, BioEngineering, UMD.
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6 Video Showing Feedback Control Discussion How do you think this control over particle position was achieved?
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This note was uploaded on 11/28/2010 for the course ENES enes100 taught by Professor Staff during the Spring '10 term at Maryland.

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2 351 measurement systems, metrics - Source of Information...

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