In the last decades, the high pressure sodium (HPS) lamp has been supplied in high frequency in order to increase the efficacy of the lamp/ballast system. However, at some given frequencies, standing acoustic waves, namely acoustic resonance (AR), might develop in the burner and cause lamp luminous fluctuation, extinction and destruction in the most serious case. Two main characteristics of the acoustic resonances in a 150W HPS lamp are presented in this paper and we seek for a control method to avoid the lamp AR. The first one is the characteristic of the lamp AR threshold power, and the second one is the differences between forward and backward frequency scanning effects. Both characteristics allow us to further understand the AR and to better control the lamp.Index Terms-Acoustic resonance, AR threshold power, AR detection, forward and backward frequency sweeping
OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. Abstract --This paper presents a numerical model of High Pressure Sodium (HPS) lamps including the acoustic streaming. The model is implemented in COMSOL and based on the finite elements method using a 2D axi-symmetric geometry. Moreover, a revision concerning AR experimental characterizations of HPS lamps will also be provided. The results presented in this paper will contribute to the understanding of AR phenomena and help in the electronic ballast design methods for AR avoidance.
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