Bridging Industrial Solutions With the Educational Classroom Samford University
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Bridging Industrial Solutions With the Educational Classroom Jonathan D. Jarvis, Perry A. Tompkins Samford University Overview • • • • • • • The Educational Challenge SPILL - The Industrial Solution Hardware: Components and Configuration Experiment Synopsis Measurement Software: TESSLab Electronic Experiments Conclusions The Educational Challenge Bridging the Authenticity Gap • Prevalence of Physics Teaching Laboratory computerization • Solutions by Educational Vendors rampant • Minimal Relevance beyond the classroom • Student Exposure to Industrially Authentic experiences is rare The Solution We have created a laboratory paradigm that hybridizes the best flexible solutions in data acquisition hardware and software with educati onally standard sensors. The SPILL Samford Physics Instrumented L earning Laboratory A bridge that joins industrial grade hardware and software solut ions to educational experiences of undergraduate students in the physics laboratory. Internal Data Acquisition Board The SPILL Box: Signal Conditioning 2 Simple Clips 1 AMP Fuse 33 47 32 4 14 65 38 48 31 5 15 64 39 49 30 6 16 63 40 50 29 7 17 62 41 51 28 8 18 61 42 52 27 9 19 60 43 53 26 10 20 59 44 54 25 11 21 58 45 55 24 12 22 57 46 56 23 AC in Lambda Power Supply SCT-44 6 1 -5 g n d g n d +5 +5 + 1 2 Chassis Power LED +5 V Terminal Strip Gnd Terminal Strip +12 V Terminal Strip 1 0 0k Ω 37 1 0 0 kΩ 66 10 0 kΩ 13 10 0 k Ω 3 10 0 kΩ Experiment Server Running Software 34 67 36 World-Wide Web 68 1 0 0 kΩ CB-68LPR Terminal Block 1 0 0 kΩ 1 35 1 8 7 2 6 3 4 5 ACH0/ACH1 ACH2/ACH3 BNC Panelette Light Sensor Photogates Various Transducers BNC Panelette ACH4 DIN-8 Circular Connector on Blank Panelette (viewed from front) GPCTR0 & DIO0 ¼" Stereo Phono Jack on Blank Panelette GPCTR1 ¼" Stereo Phono Jack on Blank Panelette DC 12V Out/ ACH5 DC 5V Out/ DC 5V Out BNC Panelette BNC Panelette The Industrial Interface • Industrial Grade Components • CA-1000 Specifically Configured • NI CB-68-LPR Terminal Block Interfaces to NI PCI-MIO-16E-4 DAQ Card • • Sensor Interface Compatible with many industrial and educational sensors • • 6 Analog Channels used Digital Channels for DIO/Counter Timers • • +-5, +12 V Internal/External Excitation SPILL Box Wiring Schematic Experiment Synopsis Experiment Concept Sensors Interface Used Software Kinetic Friction Coefficience of Friction Photogate GPCTR0 & DIO0 Triggered – measured buffered semi-periods Explosions & Collisions Conservation of Momentum 2 Photogates GPCTR0, GPCTR1 Pulse Period Measurement Centripetal Force Uniform Rotary Motion Photogate GPCTR0 Continuous measured buffered semi-periods Moment of Inertia Angular Acceleration Photogate GPCTR0 & DIO0 Triggered – measured buffered semi-periods Rocket Engine Thrust Thrust, Force and Impulse Force Sensor ACH4 Oversampled buffered acquisition Linear Expansion Expansion of Solids Linear Potentiometer, Thermistor ACH0, ACH5, +5V Simple oversampled multipoint acquisition Sound Resonance Wavelength of Sound Microphone, External Function Generator ACH0 Oversampled buffered acquisition Field Mapping Electrostatic Field Mapping ACH0, +5V Simple oversampled multipoint acquisition Experiment Synopsis (cont.) Capacitive Time Constant Capacitor Charge Decay ACH0, +5V Simple oversampled acquisition using software timing Ampere's Law Magnetic field of a long-straight wire Hall Probe ACH0, +5V Simple oversampled multipoint acquisition RL AC Circuits Inductors in AC External Function Generator ACH0, ACH1, ACH2 Oversampled buffered acquisition RLC AC Circuits RLC AC Circuits External Function Generator ACH0, ACH1, ACH2, ACH3 Oversampled buffered acquisition Polarization of Light Wave Nature of Light Rotary Motion Sensor, Light Sensor GPCTR0, ACH4 Simple oversampled multipoint acquisition & event counting Intensity of Light Intensity variation with distance Light Sensor ACH4 Simple oversampled multipoint acquisition Interference & Diffraction Wave Nature of Light Rotary Motion Sensor, Light Sensor GPCTR0, ACH4 Simple oversampled multipoint acquisition & event counting Spectroscopy Atomic Structure Rotary Motion Sensor, High Sensitivity Light Sensor GPCTR0, ACH4 Simple oversampled multipoint acquisition & event counting TESSLab Measurement Software Test Executive System for Samford Laboratories Measurement Software Test executive system programmed in LabVIEW • Adaptive/Expandable Script System • Contains Pre-made experiment scripts • Single interface operates all experiments • Addition of new experiments straightforward • Electronic Experiments: RL/RC/RLC AC Circuit v,i Vm Im time VGen VGen Vind φ VR Vr RL phasor diagram VL φ VR Vr RLC phasor diagram V L - VC Electronic Experiments: RL/RC/RLC AC Circuit(cont.) Interfaces Used • ACH0, ACH1, ACH2, ACH3 Sensors Used • External Function Generator + V 2 L Buffered acquisition of four waveforms. Make sure sample rate includes oversampling and Nyquist. Phase data is relevant. - C + Software Strategy: R V3 V1 - + r + V0 - Electronic Experiments: Capacitive Time Constant Interfaces Used • ACH0, +5V Sensors Used • None V R C Software Strategy: Simple collection of oversampled DC data using software timing for time data. V Electronic Experiments: Electrostatic Field Mapping Interfaces Used • ACH0, +5V Sensors Used • None Software Strategy: Simple averaging of analog data, placed into a 2-D array. + - Electronic Experiments: B -Field of a Long Straight Wire Interfaces Used • ACH0, +5V Sensors Used • Hall Effect Probe • External 5V 50Amp Power Supply R=0.1Ω R=0.1Ω R=0.1Ω R=0.1Ω Magnetic Field Probe Software Strategy: Simple collection of oversampled DC data. Position data is manually inputed. V=5V Electronic Experiments: Linear Expansion Interfaces Used • ACH0, ACH5, +5V Sensors Used • Linear Potentiometer, Thermistor Software Strategy: Simple collection of oversampled DC data using software timing for time data. Electronic Experiments: Linear Expansion Wiring diagram for Omega’s Linear Displacement Potentiometer. Wiring diagram for the thermistor in the Pasco Thermal Expansion Apparatus. Conclusions •The CA-1000 interfaces have been a tremendous success since their incorporation into our laboratories. •This solution has application and implications that extend far beyond the educational classroom and into graduate school and real industrial settings. •The authentic learning that the students are exposed to through these hardware and LabVIEW software strategies makes this the most cost effective solution possible, in the big picture. • We would much rather have these interfaces running rampant. The authors would like to thank: • Samford University • National Instruments
