Title :
Sound emissions from pulse operated high-pressure-sodium lamps
Author :
Kaiser, Walter ; Correa, Alexander Fernandez ; Marques, Ricardo Paulino
Author_Institution :
Escola Politecnica, Sao Paulo Univ., Brazil
Abstract :
Current pulse fed HPS lamps generates audible noise even if the lamp power frequency does not excite longitudinal acoustic resonance modes inside the arc tube. This noise is caused by magnetostriction in conductive parts of the arc tube-supporting frame and in the wires passing through the seal of the outer glass envelope. Conductor dimensional changes effectively couple mechanical energy to the jacket. Photoacoustic effects also cause noise due to pressure waves in a thin air layer surrounding the lamp. This paper investigates experimentally both phenomena and quantifies their contribution in order to minimize acoustic emissions.
Keywords :
acoustic emission; acoustic noise; acoustic variables measurement; magnetostriction; metal vapour lamps; noise abatement; photoacoustic effect; sodium; acoustic emissions minimisation; arc tube; arc tube-supporting frame; audible noise generation; conductive parts; conductor dimensional changes; lamp power frequency; longitudinal acoustic resonance modes; magnetostriction; mechanical energy; outer glass envelope seal; photoacoustic effects; pressure waves; pulse operated high-pressure-sodium lamps; sound emissions; thin air layer; wires; Acoustic emission; Acoustic noise; Acoustic pulses; Frequency; Lamps; Magnetostriction; Power generation; Pulse generation; Resonance; Wires;
Conference_Titel :
Industry Applications Conference, 2003. 38th IAS Annual Meeting. Conference Record of the
Print_ISBN :
0-7803-7883-0
DOI :
10.1109/IAS.2003.1257671
