Abstract
Relation between basic properties of barium tungstate emitter and characteristics of 400-Watt high pressure mercury lamps using the emitter was investigated.Measurements of emission and evaporation properties of the emitter were performed in a test tube connected to an exhausting pump. Starting characteristics and lumen maintenance of the lamps using the emitter were also measured.An emitter consisting of a mixture Ba1.8Sr0.2CaWO6 and 11.5%(wt) aluminum oxide has a higher evaporation rate of active barium than that of a mixture of Ba1.8Sr0.2CaWO6 and 21.9%(wt) yttrium oxide. The lumen maintenance of the lamps using the latter emitter is superior to those using the former emitter. It becomes clear that lower work function of an emitter results in lower starting voltage of the lamps.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
More From: JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.