A Study on Outgassing of Evacuated Glazing under Optical Illumination

N Ng and L So, School of Physics, University of Sydney

Evacuated glazing is made of two glass sheets sealed together around the edges, separated by an evacuated space. This glazing has good thermal insulating property because of negligible gaseous conductance across the device. Depending on the sample making process, when an evacuated and sealed sample is exposed to an optical source, the pressure within the device may increase and could affect its insulating property. Experimental techniques were developed to investigate the outgassing mechanisms of the device under optical illumination. The major gas species released and their origins have been studied. The time dependence of outgassing of the sample during optical illumination has been related to gases which are released during sample making process. The outgassing of the device is found to reduce if the sample is heated at high temperatures during evacuation.

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The Authors

Mr. Nelson Ng Research fellow The University of Sydney Nelson Ng is the research fellow in the University of Sydney. He has worked in the investigation of thermal and optical stability of vacuum glazing for many years and plays a major role in the vacuum ... Read more