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Plasma Lighting

Plasma Lighting. Brandon Hale Matt MacFarlane ELEC 6570 Spring 2004. Questions. What electrode structure will improve the luminance efficiency and the luminance characteristics in a dielectric barrier discharge flat lamp?

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Plasma Lighting

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  1. Plasma Lighting Brandon Hale Matt MacFarlane ELEC 6570 Spring 2004

  2. Questions • What electrode structure will improve the luminance efficiency and the luminance characteristics in a dielectric barrier discharge flat lamp? • Which method of lighting is more effective at decontaminating surfaces contaminated with spores?

  3. Overview • Definition Of Acronyms • Types of Plasma Lamps • Improvement of Luminance Efficiency in a Dielectric Barrier • Uses of Plasma Lighting For Decontamination • Improving Luminous Efficiency of Plasma Display Panel • Self Erasing Discharge

  4. Definition Of Acronyms • CCFL – Cold Cathode Fluorescent Lamp • CW- Continuous Wave • DFL – Discharge Flat Lamp • UV-Ultraviolet

  5. Types of Plasma Lamps • Mercury • Low Pressure Vapor Discharge Lamp • Emits light in UV wavelength range • Low pressure creates “cold plasma” • Much more efficient than filament bulbs • High Pressure • Light emitted in visible light range • Fluorescent coating may be used to adjust color • May not be turned off and on quickly because of pressure changes • Commonly used outside S. Eliezer and Y. Eliezer, The Fourth State of Matter. Bristol: Institute of Physics Publishing, 2001.

  6. Types of Plasma Lamps • Metal Halide (salt) Lamp • Lifetimes of up to 30,000 hours • Offer wide varieties of color • Often used for lighting large areas • Sodium Lamp • Highly efficient • Gives off yellowish light • Argon is used to lower the required discharge voltage • High lamp wall temperatures are required to keep sodium vapor at a high pressure http://www.ushio.com/det_gl_pulsestrike.htm http://www.venturelighting.com/AboutVenture/metal_halide_story.htm

  7. Improvement of Luminance Efficiency in a Dielectric Barrier • Mercury in both hot cathode lamp and CCFL • Household and Industries • Preservation of the Environment • Xenon discharge lamp • Serious disadvantage of low luminance efficiency • Incapability of high luminance in low-pressure (≤760 torr) M. G. Kwak, J. I. Han, Y. H. Kim, S. K. Park, D. K. Lee, and S. H. Sohn, “Improvement of Luminance Efficiency in Xenon Dielectric Barrier Discharge Flat Lamp,” IEEE Trans. on Plasma Science, Vol. 31, p.176-179, 2003.

  8. Improvement of Luminance Efficiency in a Dielectric Barrier Structure of the dielectric barrier DFL M. G. Kwak, J. I. Han, Y. H. Kim, S. K. Park, D. K. Lee, and S. H. Sohn, “Improvement of Luminance Efficiency in Xenon Dielectric Barrier Discharge Flat Lamp,” IEEE Trans. on Plasma Science, Vol. 31, p.176-179, 2003.

  9. Improvement of Luminance Efficiency in a Dielectric Barrier • Plane Electrode • Matrix Electrode • Reduced dielectric loss Matrix Shape Electrode M. G. Kwak, J. I. Han, Y. H. Kim, S. K. Park, D. K. Lee, and S. H. Sohn, “Improvement of Luminance Efficiency in Xenon Dielectric Barrier Discharge Flat Lamp,” IEEE Trans. on Plasma Science, Vol. 31, p.176-179, 2003.

  10. Plasma Lighting Used to Decontaminate Surfaces • Testing done by University of Missouri-Columbia • UV Light sources were: • 1kW mercury-argon-medium-pressure CW lamp • Pulsed linear xenon lamp • DNA absorption of UV light causes killing effect of UV light. • Spores Vs. Vegetative Cells • Spores are more resilient to biological effects of UV light. • Spores are dormant and only repair UV damage during outgrowth and germination Kenneth F. McDonald, et al. “Comparison of Pulsed and CW Ultraviolet Light Sources to Inactivate Bacterial Spores on Surfaces,” IEEE Transactions on Plasma Science., vol 30, no. 5, October 2002.

  11. Plasma Lighting Used to Decontaminate Surfaces Kenneth F. McDonald, et al. “Comparison of Pulsed and CW Ultraviolet Light Sources to Inactivate Bacterial Spores on Surfaces,” IEEE Transactions on Plasma Science., vol 30, no. 5, October 2002.

  12. Plasma Lighting Used to Decontaminate Surfaces • Results • Pulsed light kills vegetative cells more efficiently • This is attributed to peak power and spectral content • Pulsed xenon flashlamps create larger photon fluxes than medium pressure continuous wave mercury bulbs • No apparent difference in killing of spores Kenneth F. McDonald, et al. “Comparison of Pulsed and CW Ultraviolet Light Sources to Inactivate Bacterial Spores on Surfaces,” IEEE Transactions on Plasma Science., vol 30, no. 5, October 2002.

  13. Improving Luminous Efficiency of Plasma Display Panel • Self-erase discharges into the sustaining period • More efficient state • Emits more visible light Chen, Chern-Lin, and Shin-Tai Lo. "Improving Luminous Efficiency of AC-Type Plasma Display Panels by Adjusting the State of Sustaining Discharges in the Sustaining Period ." IEEE Transaction on Plasma Science 30 (2002): 428-436

  14. Self Erasing Discharge Jun Hun Kim, et al.” Temporal behavior of the wall voltage in a surface-type alternating current plasma display panel cell using laser induced fluorescence spectroscopy,” JOURNAL OF APPLIED PHYSICS. Vol. 89 No. 5, March 1 2001.

  15. Self Erasing Discharge • Neon has a wavelength of 585 nM • Orange light • Degrades blue and green lights desired from Xenon • Self Erasing Discharge • Created by a ramped-square sustain pulse reported to improve • Luminance • Luminous efficiency Hueng-Sik Tae, et al. “ New Color-Enhancing Discharge Mode Using Self-Erasing Discharge in AC Plasma Display Panel,” IEEE Transactions on Plasma Science,vol.31, no. 2, April 2003.

  16. Self Erasing Discharge • Self Erasing Discharge • Luminous intensity acts differently than discharge intensity • Visible light is induced twice during Self Erasing Discharge • Because of the ramped-square wave there is a longer sustained discharge to emit IR 823nm for a longer time this is shown in figure on following slide Hueng-Sik Tae, et al. “ New Color-Enhancing Discharge Mode Using Self-Erasing Discharge in AC Plasma Display Panel,” IEEE Transactions on Plasma Science,vol.31, no. 2, April 2003.

  17. Self Erasing Discharge Hueng-Sik Tae, et al. “ New Color-Enhancing Discharge Mode Using Self-Erasing Discharge in AC Plasma Display Panel,” IEEE Transactions on Plasma Science,vol.31, no. 2, April 2003.

  18. Self Erasing Discharge Figure explanation on following slide Hueng-Sik Tae, et al. “ New Color-Enhancing Discharge Mode Using Self-Erasing Discharge in AC Plasma Display Panel,” IEEE Transactions on Plasma Science,vol.31, no. 2, April 2003.

  19. Self Erasing Discharge • Shown on the left is (a) green and (b) blue emissions with 50-150 kHz wavelengths. On the right shows the increase in (a) green and (b) blue emissions when a ramped square waveform is used at 150 kHz. The right side shows the gain in efficiency of blue and green emissions. Hueng-Sik Tae, et al. “ New Color-Enhancing Discharge Mode Using Self-Erasing Discharge in AC Plasma Display Panel,” IEEE Transactions on Plasma Science,vol.31, no. 2, April 2003.

  20. Answers • What electrode structure will improve the luminance efficiency and the luminance characteristics in a dielectric barrier discharge flat lamp? • Matrix shape electrode • Which method of lighting is more effective at decontaminating surfaces contaminated with spores? • Pulsed light and continuous wave light sources were equally effective at killing spores

  21. Conclusions • Definition Of Acronyms • Types of Plasma Lamps • Improvement of Luminance Efficiency in a Dielectric Barrier • Uses of Plasma Lighting For Decontamination • Improving Luminous Efficiency of Plasma Display Panel

  22. ? Questions

  23. References • M. G. Kwak, J. I. Han, Y. H. Kim, S. K. Park, D. K. Lee, and S. H. Sohn, “Improvement of Luminance Efficiency in Xenon Dielectric Barrier Discharge Flat Lamp,” IEEE Trans. on Plasma Science, Vol. 31, p.176- 179, 2003. • C. L. Chen, and S. T. Lo. "Improving Luminous Efficiency of AC-Type Plasma Display Panels by Adjusting the State of Sustaining Discharges in the Sustaining Period ." IEEE Transaction on Plasma Science, Vol. 30, p.428-436, 2002 • Kenneth F. McDonald, et al. “Comparison of Pulsed and CW Ultraviolet Light Sources to Inactivate Bacterial Spores on Surfaces,” IEEE Transactions on Plasma Science., vol 30, no. 5, October 2002. • S. Eliezer and Y. Eliezer, The Fourth State of Matter. Bristol: Institute of Physics Publishing, 2001. • http://www.venturelighting.com/AboutVenture/metal_halide_story.htm

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