Post on 26-Feb-2016
description
Teaching Computer-BasedData Acquisition and Analysis
Research Skills Using LabVIEWJohn Essick
Reed College
•Reed Advanced Laboratory•LabVIEW-Based Instruction•Required Cost and Time for Instruction
OUTLINE:
BASIC RESEARCH SKILLSApply Classroom TheoryBackground Literature SearchesConsultation With ExpertsAdequate Level of PrecisionRange of an ApproximationSuppression of Competing Effects
ElectronicsComputer-Assisted Data AcquisitionOpticsVacuum TechnologyData Analysis TechniquesDesign of Sophisticated InstrumentationPatienceConsistency Checking
Outside Interest In ResultsBenefit Of Peer ReviewHonest, Timely, Concise Report of Results
PHYSICAL UNDERSTANDING
DATA-TAKING SKILLS
RESPONSIBILITY TO THE COMMUNITY
BASIC RESEARCH SKILLSApply Classroom TheoryBackground Literature SearchesConsultation With ExpertsAdequate Level of PrecisionRange of an ApproximationSuppression of Competing Effects
ElectronicsComputer-Assisted Data AcquisitionOpticsVacuum TechnologyData Analysis TechniquesDesign of Sophisticated InstrumentationPatienceConsistency Checking
Outside Interest In ResultsBenefit Of Peer ReviewHonest, Timely, Concise Report of Results
PHYSICAL UNDERSTANDING
DATA-TAKING SKILLS
RESPONSIBILITY TO THE COMMUNITY
REED JUNIOR-LEVEL ADVANCED LAB
Amplifier, Filter, Oscillator, Logic
A/D, D/A HardwareMicroprocessor
Assembly Language
Guided and Independent Experiments
NoviceStudent
ELECTRONICS
PHYSICS
COMPUTER(Low-Level)
AutonomousResearcher
Senior ThesisSummer Internship
Graduate SchoolCareer
REED JUNIOR-LEVEL ADVANCED LAB
Amplifier, Filter, Oscillator, Logic
Guided and Independent Experiments
NoviceStudent
ELECTRONICS
PHYSICS
COMPUTER(High-Level)
AutonomousResearcher
Senior ThesisSummer Internship
Graduate SchoolCareer
Data Acquisition BoardCommunicate via Interface Bus
Symbolic LanguageData Analysis
OCCIDENTAL SOLID STATE LAB EXPERIENCE
Require Students to Write GPIB Code (BASIC, FORTRAN, C):
10 REAL Rdg20 ASSIGN @Dmm TO 72230 OUTPUT @Dmm;
“MEASURE:VOLTAGE:DC? 10,0.003”40 ENTER @Dmm; Rdg50 PRINT Rdg60 END
OCCIDENTAL SOLID STATE LAB EXPERIENCE
Require Students to Write GPIB Code (BASIC, FORTRAN, C):
10 REAL Rdg20 ASSIGN @Dmm TO 72230 OUTPUT @Dmm;
“MEASURE:VOLTAGE:DC? 10,0.003”40 ENTER @Dmm; Rdg50 PRINT Rdg60 END
Lesson Learned for Computer-Based Instruction:
Need to Teach a Programming Language (with Short Learning Curve)
ADVANTAGES OF LABVIEW SYSTEM1. Well-Designed, Popular System
Computer Multi-Function Data Acquisition (DAQ)General Purpose Interface Bus (GPIB)
LabVIEWSoftware
National Instruments Products
LabVIEW System
ADVANTAGES OF LABVIEW SYSTEM1. Well-Designed, Popular System
Computer Multi-Function Data Acquisition (DAQ)General Purpose Interface Bus (GPIB)
LabVIEWSoftware
National Instruments Products
•Integrated Hardware & Software
•Extensive Data Acquisition & Analysis Capabilities
•Widely Used in Research Labs
LabVIEW System
ADVANTAGES OF LABVIEW SYSTEM2. LabVIEW Programming Language is Graphical Block Diagram (Program Code):
Front Panel (User Interface):
ADVANTAGES OF LABVIEW SYSTEM2. LabVIEW Programming Language is Graphical Block Diagram (Program Code):
Front Panel (User Interface):
•Novel
•Intuitive
•Do Useful Things Quickly
3. Express VIs for Streamlined Programming of Common TasksADVANTAGES OF LABVIEW SYSTEM
Digital Oscilloscope Using DAQ Assistant Express VI
Digital Oscilloscope Using DAQ Assistant Express VI
Digital Oscilloscope Using DAQ Assistant Express VI
Thermistor Calibration Using Curve Fit Express VI
Steinhart-Hart Equation:
Digital Thermometer
A/DOhm’s Law
Steinhart-Hart
Voltage Temperature
Software
4. Flexibility is Ideal for Independent Projects
Digital OscilloscopeDAQ Assistant
ADVANTAGES OF LABVIEW SYSTEM
4. Flexibility is Ideal for Independent Projects
Spectrum AnalyzerDAQ Assistant
ADVANTAGES OF LABVIEW SYSTEM
FFT
OVERVIEW OF LABVIEW INSTRUCTIONWeek 1: Structures and Plotting (6 Hours)
While Loop and Waveform ChartFor Loop and Waveform GraphMathscript Node and XY Graph
Week 2: Data Acquisition and Generation with DAQ Assistant (3 Hours)Analog-to-Digital Conversion, Digital OscilloscopeDigital-to-Analog Conversion, Function Generator
Week 3: Data Files, Local Variables, Structures (6 Hours)Data Files and Character StringsShift RegistersCase StructureSequence Structure
Week 4: Data Analysis (3 Hours)Least-Squares Curve Fitting, Digital ThermometerFast 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
DATA FILESSpreadsheet Format
DATA ANALYSISNumerical IntegrationNumerical DifferentiationCurve Fitting Fast Fourier Transform
DATA ACQUISITIONDigital OscilloscopeFunction GeneratorDigital ThermometerSpectrum AnalyzerPID Temperature Control System
GPIB/USB CONTROLAgilent 34410A Multimeter
SPRING-SEMESTER PHYSICS 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)
Guided Experiments:
Chaotic Circuit
LabVIEW
(Kiers et al, AJP 72, 503)
High-Temperature Superconductor
Agilent 34410A
Four-Probe Resistance
Agilent 34410A
Thermocouple
Thermocouple Voltage
LabVIEW
GPIB
InsulatedSample
COST
1. PCIe-6351: ($1400):
2. USB-6009: ($250):
3. myDAQ: ($199 for Students):
Limited Signal Generation
Analog Input 16-Bit, 1.25 MSample/sAnalog Output 16-Bit, 2.86 MSample/s
No Hardware Triggering
Analog Input 16-Bit, 200 kSample/sAnalog Output 16-Bit, 200 kSample/s
Analog Input 14-Bit, 48 kSample/sAnalog Output 12-Bit, 150 Sample/s
TIME
1. Seven-Week Intermediate Skill Level
2. Three-Week Introduction (Basic LabVIEW + DAQ Assistant)
3. Student Edition of LabVIEW $20 Learn Programming as HomeworkControl Hardware in Lab
4. myDAQ + Student Edition of LabVIEW $199
Learn Programming and Control Hardware as Homework