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PLOTS SPECTROSCOPE webcam + DVD + slit + case + software                   =         Digital Spectroscope
Desktop kit uses a webcam ($40)                                  Clip on device for smartphone ($10)                Public...
Spectral Workshop•Online (share camera)•Offline (no longer supported, but available)•Allows calibration of spectra capture...
CALIBRATION    CFL spectrum overlaid with intensity436nm blue line       546nm green line
Some Captured SpectraCalibration using CFL – standard spectra   Mercury discharge lamp              Solar spectrum        ...
Photosynthetically Active Radiation (PAR)http://publiclaboratory.org/notes/cfastie/3-16-2013/par Absorbance using halogen ...
Beer’s Law  Does coffee obey Beer’s Law (500nm absorbance)http://publiclaboratory.org/notes/akjeff91/3-28-2013/does-coffee...
Fraunhofer’s Lines in Solar Spectrumhttp://publiclaboratory.org/notes/cfastie/3-2-2013/fraunhofer
Flame Emission Spectrography                  Injecting metal salt solutions into bunsen venturi                          ...
Wine Analysis By Absorption              Wine in petri dish over incandescent light source              baseline, analysed...
Energy Drink Artificial Colouringhttp://publiclaboratory.org/notes/natalieorms/3-28-2013/qualitative-comparison-percent-tr...
More Applications•   Black Body Radiation•   LED colour analysis•   Halogen vs Incandescent vs LED lighting•   Stage 2 phy...
Sample Spectra  (not from spectral workbench)http://www.ausetute.com.au/emissions.html
Building The Spectroscope• Make a slit for the end of the box• Put some DVD plastic over the camera lens• Put the camera i...
DVD Plastic Diffraction Grating                                   The DVD plastic from a blank                            ...
The Slit• Aluminium Foil stuck  to a microscope slide• Sticky tape !• Smaller slit = better  resolution• 0.5mm is good• An...
Camera and Slit        ArrangementCover is off the boxThe slit to camera distance isdependant on the minimumfocusing range...
Camera Angle      •About 45-60 degrees      works well      •Align with slit opening      •Blu Tak is your friend      •Re...
Spectral Workbench - Offline•   Windows Installation Instructions•   You need          Spectral Workbench Master (folder 3...
WinVDIG - QTCapSource should be “USB Video Device WDM”                               Preview should be “compressed”       ...
Run Spectral Workbench• “Spectral workbench  master/spectrometry_kit/application.windows/sp  ectrometry_kit.exe”• You shou...
Getting The PictureAdjust sample row by click and drag vertically. It is clumsy !
Getting a Nice Spectra• Two green lines + sharp blue + many reds• No overexposure• Small slit = good resolution
Troubleshooting•Grey Screen of Death means WinVDIG orquicktime aren’t set up properly•Try using the ‘scope with a big slit...
Want to Know More ?• http://spectralworkbench.org/capture• https://github.com/jywarren/spectral-  workbench
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Plots spectroscope sasta presentation 2013

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The PLOTS spectroscope is a cheap ($10) device that boasts good resolution, is easy to buld and has applications in a number of areas. This slide show was put together for a workshop at the South Australian Science Teachers annual conference 2013. It details how to build the spectroscope, install the software and outlines many uses for it in education. It provides links to the main PLOTS site, where a non-profit version of the scope is being sold and the software developed.

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Plots spectroscope sasta presentation 2013

  1. 1. PLOTS SPECTROSCOPE webcam + DVD + slit + case + software = Digital Spectroscope
  2. 2. Desktop kit uses a webcam ($40) Clip on device for smartphone ($10) Public Laboratory (and kickstarter)
  3. 3. Spectral Workshop•Online (share camera)•Offline (no longer supported, but available)•Allows calibration of spectra captured by camera•Uses CFL spectra (mercury lines)
  4. 4. CALIBRATION CFL spectrum overlaid with intensity436nm blue line 546nm green line
  5. 5. Some Captured SpectraCalibration using CFL – standard spectra Mercury discharge lamp Solar spectrum Green laser 484nm Osram Biolux lamp Halogen Strontium chloride Red Bull (for absorbance)
  6. 6. Photosynthetically Active Radiation (PAR)http://publiclaboratory.org/notes/cfastie/3-16-2013/par Absorbance using halogen (probably) as source lamp (baseline) and subtracting light transmitted by chlorophyll solution
  7. 7. Beer’s Law Does coffee obey Beer’s Law (500nm absorbance)http://publiclaboratory.org/notes/akjeff91/3-28-2013/does-coffee-obey-beers-law
  8. 8. Fraunhofer’s Lines in Solar Spectrumhttp://publiclaboratory.org/notes/cfastie/3-2-2013/fraunhofer
  9. 9. Flame Emission Spectrography Injecting metal salt solutions into bunsen venturi and analysing the spectrahttp://publiclaboratory.org/notes/straylight/10-14-2012/classroom-flame-spectroscopy
  10. 10. Wine Analysis By Absorption Wine in petri dish over incandescent light source baseline, analysed for absorption characteristicshttp://publiclaboratory.org/notes/warren/1-19-2012/wine-spectroscopy-adam-hasler
  11. 11. Energy Drink Artificial Colouringhttp://publiclaboratory.org/notes/natalieorms/3-28-2013/qualitative-comparison-percent-transmittance-three-energy-drinks-do-conc
  12. 12. More Applications• Black Body Radiation• LED colour analysis• Halogen vs Incandescent vs LED lighting• Stage 2 physics (Balmer Series)• Stage 2 chemistryhttp://publiclaboratory.org/wiki/spectral-analysis
  13. 13. Sample Spectra (not from spectral workbench)http://www.ausetute.com.au/emissions.html
  14. 14. Building The Spectroscope• Make a slit for the end of the box• Put some DVD plastic over the camera lens• Put the camera in the box, opposite the slit, at about 45°• Install the software, plug in the camera• Select view• Calibrate• Use
  15. 15. DVD Plastic Diffraction Grating The DVD plastic from a blank DVD (+/- R) has almost parallel lines printed at 740nm spacing. These provide a cheap and effective transmission diffraction grating. First order maxima of interference pattern is at around 60 degrees. The camera and DVD are angled around 50 degrees to introduce an incident angle, which makes the pattern asymmetric. One side of the pattern is now centred in theThe DVD “grooves” run vertically middle of the camera field of view.
  16. 16. The Slit• Aluminium Foil stuck to a microscope slide• Sticky tape !• Smaller slit = better resolution• 0.5mm is good• Any old slit works !
  17. 17. Camera and Slit ArrangementCover is off the boxThe slit to camera distance isdependant on the minimumfocusing range of the camera.The longer the distance, thebetter the resolution
  18. 18. Camera Angle •About 45-60 degrees works well •Align with slit opening •Blu Tak is your friend •Reversing the angle reverses the spectrum order •Changing the angle also spreads out the spectrum a bit
  19. 19. Spectral Workbench - Offline• Windows Installation Instructions• You need Spectral Workbench Master (folder 35MB) Apple Quicktime (Quicktime Installer – Use default settings) WinVDIG_101 (installer – Use default settings note that only version 1.01 works, not newer versions)• After installing quicktime, you need to: copy C:Program Files (x86)QuickTimeQTSystemQTJava.zip to C:Program Files (x86)Javajre6libextQTJava.zip• After Installing WinVDIG_101 run QTCap, which is a video or webcam stream that allows spectral workbench to capture your webcam through quicktime (QTCap)• Follow the instructions for QTCap on the next slide, this gets you a webcam feed
  20. 20. WinVDIG - QTCapSource should be “USB Video Device WDM” Preview should be “compressed” The webcam video should come up in the boxes
  21. 21. Run Spectral Workbench• “Spectral workbench master/spectrometry_kit/application.windows/sp ectrometry_kit.exe”• You should see a grey screen and the QTCap window again• Select the webcam source and preview “compressed”• Click OK.• In a few seconds, spectral workbench will fire up
  22. 22. Getting The PictureAdjust sample row by click and drag vertically. It is clumsy !
  23. 23. Getting a Nice Spectra• Two green lines + sharp blue + many reds• No overexposure• Small slit = good resolution
  24. 24. Troubleshooting•Grey Screen of Death means WinVDIG orquicktime aren’t set up properly•Try using the ‘scope with a big slit to getan idea of where the spectrum lies Mercury Discharge Lamp•Don’t clean the DVD plastic, the purplelayer has the lines on it !•Use the “Adjust Sample Row” to seeeverything the camera sees, then angle thecamera to get the image.•Reducing reflections inside the box helpsthe camera auto exposure work•Don’t be afraid to play with the apparatus,turn the camera or move stuff around
  25. 25. Want to Know More ?• http://spectralworkbench.org/capture• https://github.com/jywarren/spectral- workbench

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