The effect of active antennas on the hot-restrike of high intensity discharge lamps
| Autor: | Peter Awakowicz, C Ruhrmann, F Freddy Manders, T. Hoebing, Juergen Mentel, B Koch, A Bergner |
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| Rok vydání: | 2014 |
| Předmět: |
Gas-discharge lamp
Neon lamp Acoustics and Ultrasonics business.industry Chemistry Polarity symbols Buffer gas Analytical chemistry Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Ignition system law Electric field Electrode Optoelectronics Active antenna business |
| Zdroj: | Journal of Physics D: Applied Physics. 47:205501 |
| ISSN: | 1361-6463 0022-3727 |
| DOI: | 10.1088/0022-3727/47/20/205501 |
| Popis: | The ignition voltage of high intensity discharge (HID) lamps with mercury as the buffer gas may rise from 3 kV for the cold state up to more than 15 kV for a hot lamp. By coating a lamp burner with an electrically conductive layer, which operates as an active antenna, the ignition voltage of HID lamps can be significantly reduced. An active antenna connected to one of the lamp electrodes transports the potential from this electrode to the vicinity of the opposite electrode and generates an enhanced electric field inside the burner. On applying a symmetrically shaped ignition pulse, a weak pre-discharge within the first half-cycle produces free charge carriers initiating ignition of the lamp within the subsequent second half-cycle. The authors present a set-up for electrical and optical investigations of hot-restrike in HID lamps. The ignition voltage is measured for two different polarities as a function of the cooldown time. An analysis of its reduction is given. Furthermore, the pre-discharge is investigated by means of short-time photography. It is demonstrated that a negative polarity of the active antenna within the first half-cycle and a positive polarity within the second one is the most effective succession. |
| Databáze: | OpenAIRE |
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