electronic instrumentation
TRANSCRIPT
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Scientific Electronic Instrumentation
Peter Stallinga, September 2009
Universidade do Algarve
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Outline
0. Introduction
1. Signal conditioning- Op-amp circuits- Wheatstone bridge- Noise- Lock-In amplifier- Cables (coaxial, twisted pair, optical fiber, etc.)
2. Signal generation (Sensors)- Actuators: Relais, solid-state switch- Temperature: Thermo-couple, PT100, diode, LM35DZ, bimetal- Optical: LDR and optodiode.- Movement: RPM and Doppler- Length- Bending (extensiometers)- Acceleration- Angle (Gray code)- Magnetic field: Hall and NMR- Humidity- Pressure: Membrane, Piranni, Penning- (Sound) pressure sensors (microphone) and actuators (speakers)- Stepper motors- MEMs- Mass: QCM- Gravity
3. Signal acquisition- Analog-digital converters (ADC/DAC)- Interfacing- Parallel port- Serial port (null modem, DTE/DXE, handshaking)- USB- GPIB- Programming (LabVIEW, MatLab, Python, PASCAL)
4. Signal processing- Simple digital filter (MA, etc.)- Feedback (PID control)
5. A scientific laboratory- Vacuum pumps- Cryogenic equipment- Monochromator- Measurements:
o Hallo 4-Pointo Admittance
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Bibliography:• “Instrumentation for engineers and scientists”, J. Turner and M. Hill, Oxford
Science Publications, 1999, ISBN 0-19-856517-8• “The art of electronics”, 2nd ed., P. Horowitz and W. Hill, Cambridge
University Press, 1989, ISBN 0-521-37095-7• Sebenta Prof. J. Bastos, Universidade do Algarve.• “MEMS Mechanical Sensors”. S. Beeby, G. Ensell, M. Kraft, N. White,
Artech House, 2004, ISBN 1-58053-536-4.• “Sistema Internacional de Unidades (SI)”, 3a ed., G. de Almeida, Plátano
Edições Técnicas, 2002, ISBN 972-707-162-7• Wikipedia: http://www.wikipedia.org• Lecture notes Electronics II, P. Stallinga, Universidade do Algarve• “Electronic Instruments”, 4th ed., D.R. Patrick, Prentice Hall, 1992, ISBN 0-
13-251208-4
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Example program based on the IEEE driver of the previous pages PROGRAM TestIEEE; { Include the library with routines: } Uses ieeepas; Var s: string; status: integer; len: word; Const addr=13; begin { check if the GPIB board is present: } if (GPIBBoardPresent<>0) then begin writeln(‘No GPIB interface found. Program halted’); halt; end; { the IFcard also has an IEEE address. } { make the IFcard a controler at addr. 21: } IEEEInitialize(21, 0); { send a command to device at addr 13: } { (ask for its identity) } IEEEsend(13, ‘*IDN?’, status); { receive a reply to that question: } IEEEenter(s, 255, len, 13, status); { show reply on screen: } writeln(‘Equipment at IEEE address 13:’); writeln(s); end. The output of the program might be something like Equipment at IEEE address 13: Oxford ITC601, rev. 5.01
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LabVIEW example program
interface and diagram