Chapter 1 Notes - Chapter 1 Basic Concepts of Measurement...

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1 Chapter 1 Basic Concepts of Measurement Methods RS Figliola and DE Beasley; Theory and Design for Mechanical Measurements; 2000 Basic Concepts of Measurement Systems Definitions: A measurement assigns a specific value to a physical variable. The physical variable becomes the measured variable. A measurement system is a tool used to quantify the physical variable. Four Parts of Measurement System Sensor-Transducer Stage Signal Conditioning Stage Output Stage Feed-back Control Stage
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2 Definitions The sensor is a physical element that uses some natural phenomenon to sense the variable being measured. The transducer changes this sensed information into a detectable signal form (electrical, mechanical, optical, etc.) The goal is to convert the sensed information into a form that can be easily quantified.
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3 Intermediate Stage Signal conditioning equipment modifies the transducer signal to a desired form. This optional intermediate stage can be used to increase the magnitude of the signal through amplification, remove portions of the signal through some filtering technique, provide mechanical or optical linkage between the transducer and the output range, or other similar activities. Feedback-Control Stage In those measurement systems involved in process control, a fourth stage, called the feedback-control stage, contains a controller that interprets the measured signal and makes a decision regarding the control of the process. This decision creates a change in a process parameter that affects the magnitude of the sensed variable. Experimental design involves developing a measurement test plan.
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4 Q: What makes up a measurement test plan? 1. Parameter Design Plan : Defines test objective and identifies process variables, parameters, and a means of their control. 2. System and Tolerance Design Plan : Selection of measurement technique, equipment, and test procedure based on some preconceived tolerance limit of error. 3.
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This note was uploaded on 11/22/2011 for the course ABE 6031 taught by Professor Burks during the Summer '11 term at University of Florida.

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Chapter 1 Notes - Chapter 1 Basic Concepts of Measurement...

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