EECE312_Ch_05_Instrumentation

EECE312_Ch_05_Instrumentation - EECE312 Electronics EECE312...

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ECE312 Electronics EECE312 Electronics Dr. Walid Kamali Fall 2007 hapter 5: Instrumentation C apte 5 st u e tat o
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utline Outline strumentation Systems 1. Instrumentation Systems 2. Analog Signal Processing igital Signal Processing 3. Digital Signal Processing 2 The figures in this presentation are extracts from Foundations of Electronics by J.R.Cogdell, 1999
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strumentation System Instrumentation System utomatic Data Gathering and reporting ± Automatic Data Gathering and reporting ± Contains: Transducers, Analog Processing, Multiplexing, ADC, Computing, DAC, Analog pg , , p g , , g Processing 3
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ransducer and Bridges Transducer and Bridges ransducers measure, Location, Pressure, ± Transducers measure, Location, Pressure, Temperature, Flow, etc ± Many transducers resistance changes with yg the measurand. ± The use of a balanced bridge creates a voltage proportional to the variation of the transducer resistance. ± Strain gages resistance changes with elongation and may also be temperature sensitive. 4
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alanced Bridge Circuit Balanced Bridge Circuit 5
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otentiometers Potentiometers ixed resistor with movable contact. ± Fixed resistor with movable contact. Resistance changes with location, Voltage divider. ± Potentiometers may be: ± Translational ± Rotational ± Also may be: ± Linear ± Logarithmic 6
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ifferential Transformers Differential Transformers ± The polarity of the output voltage depend on the position of the slug. 7
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ages Gages ressure, Force or displacement may be ± Pressure, Force or displacement may be converted to electric measurement using semiconductors. ± Flow may be monitored using differential pressure gages. Also using rotational turbines ± Temperature sensors differ in type and application ± Thermistors may be placed in bridge circuits ± For thermocouples we use a reference junction 8
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rror Error arious sources of errors: ± Various sources of errors: ± I ±δ I=(V ±δ V)/(R ±δ R) ± Worse case Analysis: y ± All errors may be cumulative ± Linearization: ± Works when errors are small ± Root Mean Square 9
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nalog Signal Processing Analog Signal Processing volves: ± Involves: ± Amplification ± ain Control Gain Control ± Analog Filtering ± Care for Grounding and Shielding gg 10
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This note was uploaded on 02/07/2011 for the course EECE 312 taught by Professor Walidkamali during the Fall '07 term at American University of Beirut.

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EECE312_Ch_05_Instrumentation - EECE312 Electronics EECE312...

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