Teaching Computer-Based Data Acquisition and Analysis Research Skills Using LabVIEW

Transcription

1 Teaching Computer-Based Data Acquisition and Analysis Research Skills Using LabVIEW OUTLINE: John Essick Reed College Reed Advanced Laboratory LabVIEW-Based Instruction Required Cost and Time for Instruction

2 PHYSICAL UNDERSTANDING BASIC RESEARCH SKILLS Apply Classroom Theory Background Literature Searches Consultation With Experts Adequate Level of Precision Range of an Approximation Suppression of Competing Effects DATA-TAKING SKILLS RESPONSIBILITY TO THE COMMUNITY Electronics Computer-Assisted Data Acquisition Optics Vacuum Technology Data Analysis Techniques Design of Sophisticated Instrumentation Patience Consistency Checking Outside Interest In Results Benefit Of Peer Review Honest, Timely, Concise Report of Results

3 PHYSICAL UNDERSTANDING BASIC RESEARCH SKILLS Apply Classroom Theory Background Literature Searches Consultation With Experts Adequate Level of Precision Range of an Approximation Suppression of Competing Effects DATA-TAKING SKILLS RESPONSIBILITY TO THE COMMUNITY Electronics Computer-Assisted Data Acquisition Optics Vacuum Technology Data Analysis Techniques Design of Sophisticated Instrumentation Patience Consistency Checking Outside Interest In Results Benefit Of Peer Review Honest, Timely, Concise Report of Results

4 REED JUNIOR-LEVEL ADVANCED LAB Novice Student ELECTRONICS Amplifier, Filter, Oscillator, Logic COMPUTER (Low-Level) A/D, D/A Hardware Microprocessor Assembly Language PHYSICS Guided and Independent Experiments Autonomous Researcher Senior Thesis Summer Internship Graduate School Career

5 REED JUNIOR-LEVEL ADVANCED LAB Novice Student ELECTRONICS Amplifier, Filter, Oscillator, Logic COMPUTER (High-Level) Data Acquisition Board Communicate via Interface Bus Symbolic Language Data Analysis PHYSICS Guided and Independent Experiments Autonomous Researcher Senior Thesis Summer Internship Graduate School Career

6 OCCIDENTAL SOLID STATE LAB EXPERIENCE Require Students to Write GPIB Code (BASIC, FORTRAN, C): REAL Rdg TO 722 MEASURE:VOLTAGE:DC? 10,0.003 Rdg PRINT Rdg END

7 OCCIDENTAL SOLID STATE LAB EXPERIENCE Require Students to Write GPIB Code (BASIC, FORTRAN, C): REAL Rdg TO 722 MEASURE:VOLTAGE:DC? 10,0.003 Rdg PRINT Rdg END Lesson Learned for Computer-Based Instruction: Need to Teach a Programming Language (with Short Learning Curve)

8 ADVANTAGES OF LABVIEW SYSTEM 1. Well-Designed, Popular System LabVIEW System Computer Multi-Function Data Acquisition (DAQ) General Purpose Interface Bus (GPIB) LabVIEW Software National Instruments Products

9 ADVANTAGES OF LABVIEW SYSTEM 1. Well-Designed, Popular System LabVIEW System Computer Multi-Function Data Acquisition (DAQ) General Purpose Interface Bus (GPIB) LabVIEW Software National Instruments Products Integrated Hardware & Software Extensive Data Acquisition & Analysis Capabilities Widely Used in Research Labs

10 ADVANTAGES OF LABVIEW SYSTEM 2. LabVIEW Programming Language is Graphical Block Diagram (Program Code): Front Panel (User Interface):

11 ADVANTAGES OF LABVIEW SYSTEM 2. LabVIEW Programming Language is Graphical Block Diagram (Program Code): Novel Front Panel (User Interface): Intuitive Do Useful Things Quickly

12 ADVANTAGES OF LABVIEW SYSTEM 3. Express VIs for Streamlined Programming of Common Tasks

13 Digital Oscilloscope Using DAQ Assistant Express VI

14 Digital Oscilloscope Using DAQ Assistant Express VI

15 Digital Oscilloscope Using DAQ Assistant Express VI

16 Thermistor Calibration Using Curve Fit Express VI Steinhart-Hart Equation:

17 Digital Thermometer A/D Voltage Ohm s Law Steinhart-Hart Temperature Software

18 ADVANTAGES OF LABVIEW SYSTEM 4. Flexibility is Ideal for Independent Projects DAQ Assistant Digital Oscilloscope

19 ADVANTAGES OF LABVIEW SYSTEM 4. Flexibility is Ideal for Independent Projects DAQ Assistant FFT Spectrum Analyzer

20 OVERVIEW OF LABVIEW INSTRUCTION Week 1: Structures and Plotting (6 Hours) While Loop and Waveform Chart For Loop and Waveform Graph Mathscript Node and XY Graph Week 2: Data Acquisition and Generation with DAQ Assistant (3 Hours) Analog-to-Digital Conversion, Digital Oscilloscope Digital-to-Analog Conversion, Function Generator Week 3: Data Files, Local Variables, Structures (6 Hours) Data Files and Character Strings Shift Registers Case Structure Sequence Structure Week 4: Data Analysis (3 Hours) Least-Squares Curve Fitting, Digital Thermometer Fast Fourier Transform, Spectrum Analyzer Week 5: PID Temperature Control System (3 Hours) Spring Semester: Instrument Control via Interface Bus (4 Hours) GPIB/USB Control of Instrument Oxford University Press

21 DATA FILES Spreadsheet Format DATA ANALYSIS Numerical Integration Numerical Differentiation Curve Fitting Fast Fourier Transform DATA ACQUISITION Digital Oscilloscope Function Generator Digital Thermometer Spectrum Analyzer PID Temperature Control System GPIB/USB CONTROL Agilent 34410A Multimeter

22 SPRING-SEMESTER PHYSICS EXPERIMENTS Guided Experiments: Optical Bandgap of Semiconductor (Monochromator) Doppler-Free Saturated Absorption Spectroscopy (Laser Diode) Temperature Dependence of Diode s Saturation Current (Cryostat) Isotope Shift of Balmer Series in Hydrogen (Spectrometer) Mass of Cosmic Ray Muon (Fast-Timing Electronics) Fabrication of Fullerenes (Materials Fabrication) Proof of Existence of Photons (Single-Photon Detection)

23 Chaotic Circuit (Kiers et al, AJP 72, 503) LabVIEW

24 High-Temperature Superconductor Insulated Sample Four-Probe Resistance Agilent 34410A LabVIEW Thermocouple GPIB Agilent 34410A Thermocouple Voltage

25 COST 1. PCIe-6351: ($1400): Analog Input 16-Bit, 1.25 MSample/s Analog Output 16-Bit, 2.86 MSample/s 2. USB-6009: ($250): Analog Input 14-Bit, 48 ksample/s Analog Output 12-Bit, 150 Sample/s Limited Signal Generation 3. mydaq: ($199 for Students): Analog Input 16-Bit, 200 ksample/s Analog Output 16-Bit, 200 ksample/s No Hardware Triggering

26 TIME 1. Seven-Week Intermediate Skill Level 2. Three-Week Introduction (Basic LabVIEW + DAQ Assistant) 3. Student Edition of LabVIEW $20 Learn Programming as Homework Control Hardware in Lab 4. mydaq + Student Edition of LabVIEW $199 Learn Programming and Control Hardware as Homework