L2004-01a

data acquisition 16722 [email protected] Mo:20090302 data acquisition 150+1 read Fraden Chapter 5, Interface Electronic Circuits for some additional details and an alternative perspective to mine

16722 [email protected] Mo:20090302 data acquisition 150+2 topics ... data acquisition sensor-to-signal interface usually means convert some interesting environmental parameter to a signal voltage signal conditioning

convert analog signal to digital format (ADC) communicate signal to computer 16722 [email protected] Mo:20090302 data acquisition 150+3 data acquisition (& control) 16722 [email protected] Mo:20090302 data acquisition

150+4 sensor-to-signal interface action of environment on sensor causes it to generate an electrical signal directly voltage source (V) current (I) or charge (Q) source action of environment on sensor changes an electrical parameter that we can measure resistance changes: V ~ I capacitance changes: V ~ I dt, I ~ dV/dt

inductance changes: V ~ dI/dt, I ~ V dt 16722 [email protected] Mo:20090302 data acquisition 150+5 example: current-to-voltage conversion simple: I = Vmeasured / Rknown better: use an op amp 16722 [email protected] Mo:20090302

data acquisition 150+6 signal conditioning filter for expected frequency regime subtract DC offset (zeroing) amplify or attenuate signal (scaling) linearize relationship between measurand and observed electrical parameter now usually done in software after ADC

etc ... 16722 [email protected] Mo:20090302 data acquisition 150+7 example: AD594/595 16722 [email protected] Mo:20090302 data acquisition

150+8 analog-to-digital converter (ADC) many different principles often integrated with microcontrollers in some types, e.g., successive approximation, the CPU to participates in the conversion guess what the digital output should be feed it to a digital-to-analog converter compare analog input & output and iterate all involve trade-offs of speed (conversion time), resolution (number of bits), and cost

flash converter is fastest, lowest resolution, highest cost: required for video digitization 16722 [email protected] Mo:20090302 data acquisition 150+9 flash converter (video applications) data acquisition 16722 [email protected] Mo:20090302

data acquisition 150+10 - converter (one-bit audio) data acquisition 16722 [email protected] Mo:20090302 data acquisition 150+11

communication with computer dedicated: DAQ/C (data acquisition & control) system with embedded processors tightly integrated: card resides in PC slot a little less tight: bus extender boxes box connected to parallel/serial/USB port or just a dongle plugged into the port IEEE-4888 instrumentation bus: parallel address, control, and data lines networked: instrument assigned IP address

16722 [email protected] Mo:20090302 data acquisition 150+12 example: USB DAQ/C for $129 data acquisition 16722 [email protected] Mo:20090302 data acquisition

150+13 DAQ/C software low level: software pokes setup into input registers software peeks data stashed in output registers high level: set-up and acquire data set-up and provide system control signals analyze data (Fourier transforms, statistics, etc) interactive graphic visualization (presentation)

archiving data formatting as required by target journal etc 16722 [email protected] Mo:20090302 data acquisition 150+14 example: LabVIEW 16722 [email protected] Mo:20090302 data acquisition

150+15 assignment (24) There are many articles on the statistics of the time differences between successive drops from a dripping faucet. Design a data acquisition & control system for this problem: identify suitable commercial hardware (and optionally software), and show the control programs logic. Avoid hardware overkill, i.e., features and ranges that you dont need, as these add expense and complexity.

16722 [email protected] Mo:20090302 data acquisition 150+16 next topic sensors! light sensors basic principles of image sensors 16722 [email protected] Mo:20090302 data acquisition

150+17

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