lecture #2 data acquisition: about daq hardware and...
TRANSCRIPT
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Lecture #2 Data Acquisition: About DAQ
Hardware and LabView
September 2, 2014
PHYS 4580, 6280, and 7280
R.J. Ellingson and M.J Heben
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Last week • Exercise to introduce students to:
– LabVIEW (Measurement/control)
– Igor Pro (Analysis/Presentation)
– Optical measurement experimental Set-up.
• Time constant of Thermopile Detector
Discovery, Understanding, Manipulation
Measurement/control software
Data Analysis/Presentation Equipment & Samples
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Response time of the thermopile (at one wavelength)
CM110 monochromator
1” 2”
1 “ focal length 2 “ focal length
Lamp
USB communication
Collimated beam
1000 X amplifier
Thermopile
NI USB 6009 DAQ “board”
Chopper
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focal
length, f
Light Source Monochromator
Detector, Sample or Device
(perhaps with I/V
measurement)
The “Set-Up”
A lens or two
Samples – semiconductor layers, transparent conductive layers, PV devices
Detectors – calibrated thermopile, photodiode
Tungsten –
halogen bulb
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A thermopile is an electronic device that converts thermal energy into electrical energy. It is composed of several thermocouples connected usually in series or, less commonly, in parallel. Thermopiles do not respond to absolute temperature, but generate an output voltage proportional to a local temperature difference or temperature gradient. Thermopiles are often used to provide a voltage output in response to temperature as part of a temperature measuring device, such as the infrared thermometers widely used by medical professionals to measure body temperature. They are also used widely in heat flux sensors. The output of a thermopile is usually in the range of tens or hundreds of millivolts.
Thermopile Detector
Dexter 2M detector
After Wikipedia and Dexter Research
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Our Sun, and other Blackbody light sources, emit more than one wavelength of light.
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Wavelength Dependent Response of PV Materials and Devices
O
Quantum Efficiency, aka Spectral Response
From “Cu(InGa)Se2 Solar Cells”, by Shafarman and Stolt and PVEducation.org
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Spectral Products, CM110 1/8th meter monochromator
Serial commands sent from computer to CM110 via USB
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Czerny-Turner Monochrometer
focal length, f
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http://www.ni.com/academic/students/learn/
LabVIEW Training and References
Analog to Digital Conversion (a through resource): http://en.wikipedia.org/wiki/Analog-to-digital_converter
Reference Textbook: http://www.amazon.com/Hands-On-Introduction-LabVIEW-Scientists-Engineers/dp/0199925151