12 - MEEN260 IntroductiontoEngineering Experimentation...

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MEEN 260 Introduction to Engineering xperimentation Experimentation Data Acquisition Systems Reza Langari* Department of Mechanical Engineering angari@tamu.edu rlangari@tamu.edu *Incorporates one or more slides from Brian Rasmussen, TAMU MEEN, Copyright 2008.
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ata Acquisition Systems Data Acquisition Systems Sensor and Signal Processing Circuits Computer or Microprocessor Data Acquisition System Physical System Sensor A/D Converter Analog Filter (circuit) Digital Filter Data Recording/ Display We never know the true signal 5 2 2 2 5 2 The measured signal has noise (random error) Filter circuits clean up the signal and prevent aliasing Digital filters are flexible and easily implemented A/D converters sample the signal at specific times 0 0.5 1 1.5 0 0.5 1 1.5 0 0.5 1 1.5 0 0.5 1 1.5 0 5 10 15 20 25 -0.5 0 5 10 15 20 25 -0.5 0 5 10 15 20 25 -0.5 0 5 10 15 20 25 -0.5
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ata Acquisition Data Acquisition A complete system generally consists of: Sensor Transduces physical quantity into an electrical signal Signal Processing Equipment onverts electrical signal into desired form Converts electrical signal into desired form Thermocouple mV signal into 0 5V signal
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12 - MEEN260 IntroductiontoEngineering Experimentation...

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