1. Experimenting from a distance: optical spectrometry via the Internet Lars-Jochen Thoms

2. Experimenting from a distance: optical spectrometry via the Internet # 2 Munich, Bavaria, Germany Workshop on Remote Experiments for HE, Milton Keynes, 17.04.2015Lars-Jochen Thoms

3. Experimenting from a distance: optical spectrometry via the Internet # 3 eligible curriculum in Bavarian higher education Workshop on Remote Experiments for HE, Milton Keynes, 17.04.2015Lars-Jochen Thoms

4. Experimenting from a distance: optical spectrometry via the Internet remotely controlled laboratory (RCL) # 4 user server webcam outline educational POV physical POV technical POV Workshop on Remote Experiments for HE, Milton Keynes, 17.04.2015Lars-Jochen Thoms

5. Experimenting from a distance: optical spectrometry via the Internet # 5 physical POV light sourcespectrometeroptical fiber specifications linear silicon CCD array 650 enabled pixels 350-1000 nm 12 bit A/D resolution 75 photons/count @400nm 25 µm entrance slit ~2.0 nm FWHM Workshop on Remote Experiments for HE, Milton Keynes, 17.04.2015Lars-Jochen Thoms

6. Experimenting from a distance: optical spectrometry via the Internet # 6 physical POV problems especially advanced learners identify the acquired spectrum as black-body radiation Mind spectral sensitivity! knowledge about the measurement process  critical attitude no energy information given absolute irradiance measurement needed lg x 1000 Workshop on Remote Experiments for HE, Milton Keynes, 17.04.2015Lars-Jochen Thoms

7. Experimenting from a distance: optical spectrometry via the Internet obtain calibration data # 7 radiometric calibration standard calibrated tungsten halogen light source fit sample spectrum to known spectral power distribution calibration factor calibration factor in µJ/count per pixel Workshop on Remote Experiments for HE, Milton Keynes, 17.04.2015Lars-Jochen Thoms

8. Experimenting from a distance: optical spectrometry via the Internet # 8 spectral irradiance dark spectrum acquired sample calibration factor calibration factor A ΔtΔt ΔλΔλ ::: sample - dark Workshop on Remote Experiments for HE, Milton Keynes, 17.04.2015Lars-Jochen Thoms

9. Experimenting from a distance: optical spectrometry via the Internet cosine-corrected probe # 9 light sourcespectrometer true spectral irradiance needs 180° field of view optical fiber diffusing material: opaline glass ~180° FOV © Ocean Optics, Inc Workshop on Remote Experiments for HE, Milton Keynes, 17.04.2015Lars-Jochen Thoms

10. Experimenting from a distance: optical spectrometry via the Internet pusher.com # 10 technical POV client WebSocket service (RESTful) distribute spectral data distribute control data user information authenticated users WebSocket service (RESTful) distribute spectral data distribute control data user information authenticated users web server http service (PHP) authentication provide website http service (PHP) authentication provide website RCL spectrometer server windows service (C#) acquire spectrum calculate irradiance push data via WebSocket listen for control data control experiment windows service (C#) acquire spectrum calculate irradiance push data via WebSocket listen for control data control experiment IP cam capture video stream spectral irradiance acquired sample HTML5 browser (JS) display spectra control experiment ask for authentication display webcam HTML5 browser (JS) display spectra control experiment ask for authentication display webcam control ? special challenge: very high restrictions in German schools! no static ip needed! DATA BASE data base assessment Workshop on Remote Experiments for HE, Milton Keynes, 17.04.2015Lars-Jochen Thoms

11. Experimenting from a distance: optical spectrometry via the Internet control # 11GIREP-MPTL 2014, Palermo, 08.07.2014 Lars-Jochen Thoms, Raimund Girwidz technical POV light source cosine-corrected probe optical fiber spectrometer set acquisition parameters integration time boxcar width samples to average choose light source tungsten lamps tungsten halogen lamps compact fluorescent lamps light emitting diodes light bulbs reflector lamps carousel

12. Experimenting from a distance: optical spectrometry via the Internet control # 12GIREP-MPTL 2014, Palermo, 08.07.2014 Lars-Jochen Thoms, Raimund Girwidz technical POV light source cosine-corrected probe spectrometer set acquisition parameters integration time boxcar width samples to average choose light source tungsten lamps tungsten halogen lamps compact fluorescent lamps light emitting diodes light bulbs reflector lamps carousel optical fiber

13. Experimenting from a distance: optical spectrometry via the Internet control # 13GIREP-MPTL 2014, Palermo, 08.07.2014 Lars-Jochen Thoms, Raimund Girwidz technical POV set acquisition parameters integration time boxcar width samples to average choose light source tungsten lamps tungsten halogen lamps compact fluorescent lamps light emitting diodes light bulbs reflector lamps move probe ca. 1.5 m x 1.0 m

14. Experimenting from a distance: optical spectrometry via the Internet control # 14 technical POV set acquisition parameters integration time boxcar width samples to average choose light source tungsten lamps tungsten halogen lamps compact fluorescent lamps light emitting diodes light bulbs reflector lamps move probe ca. 1.5 m x 1.0 m Workshop on Remote Experiments for HE, Milton Keynes, 17.04.2015Lars-Jochen Thoms

15. Experimenting from a distance: optical spectrometry via the Internet control # 15 technical POV set acquisition parameters integration time boxcar width samples to average choose light source tungsten lamps tungsten halogen lamps compact fluorescent lamps light emitting diodes light bulbs reflector lamps move probe ca. 1.5 m x 1.0 m rotate probe - 90° to 90° (360° possible) automatic available many different parameters a lot of opportunities authentic experimenting Workshop on Remote Experiments for HE, Milton Keynes, 17.04.2015Lars-Jochen Thoms

16. Experimenting from a distance: optical spectrometry via the Internet # 16 Workshop on Remote Experiments for HE, Milton Keynes, 17.04.2015Lars-Jochen Thoms predefined setups

17. Experimenting from a distance: optical spectrometry via the Internet # 17 educational POV Workshop on Remote Experiments for HE, Milton Keynes, 17.04.2015Lars-Jochen Thoms context based anchored instruction objectives: compare and rate spectra from different light sources

18. Experimenting from a distance: optical spectrometry via the Internet # 18 objectives: compare and rate spectra from different light sources assess color temperature and color fault compare with color sensitivity of the human eye distinguish between physical and physiological quantities educational POV Workshop on Remote Experiments for HE, Milton Keynes, 17.04.2015Lars-Jochen Thoms

19. Experimenting from a distance: optical spectrometry via the Internet # 19 objectives: analyze energy efficiency educational POV Workshop on Remote Experiments for HE, Milton Keynes, 17.04.2015Lars-Jochen Thoms

20. Experimenting from a distance: optical spectrometry via the Internet # 20 educational POV Compact Fluorescent Lamps: differences can be noticed between the light coming from the gas discharge and light coming from the fluorescent layer Workshop on Remote Experiments for HE, Milton Keynes, 17.04.2015Lars-Jochen Thoms

21. Experimenting from a distance: optical spectrometry via the Internet # 21 objectives: examine, distinguish, classify, and rate the directional characteristics of radiation from different light sources educational POV Schultz (2010) from introductory school physics to advanced university courses Workshop on Remote Experiments for HE, Milton Keynes, 17.04.2015Lars-Jochen Thoms

22. Experimenting from a distance: optical spectrometry via the Internet # 22 Workshop on Remote Experiments for HE, Milton Keynes, 17.04.2015Lars-Jochen Thoms

23. Experimenting from a distance: optical spectrometry via the Internet # 23 educational POV Workshop on Remote Experiments for HE, Milton Keynes, 17.04.2015Lars-Jochen Thoms multiple representations augmented reality

24. Experimenting from a distance: optical spectrometry via the Internet # 24 educational POV Workshop on Remote Experiments for HE, Milton Keynes, 17.04.2015Lars-Jochen Thoms augmented reality multiple representations feedback free formula input

25. Experimenting from a distance: optical spectrometry via the Internet # 25 educational POV Workshop on Remote Experiments for HE, Milton Keynes, 17.04.2015Lars-Jochen Thoms augmented reality multiple representations feedback scaffolding cross-linking multiple representations linking theory and practice

26. Experimenting from a distance: optical spectrometry via the Internet Thank you for your attention! Lars-Jochen Thoms myrcl.org