In this paper, we report the non-dispersive infrared (IR) for detecting the vacuum level inside carbon-nanotube field-emission displays (CNT-FED). Most gas molecules, such as moisture, can be detected by using infrared absorption characteristics. Through the known IR absorption rate of the targeted gas, the pressure of the gas inside the vacuum-sealed FED panels can be calculated by ideal gas law. In our experiment, we could distinguish that there are residual organic gases (hydrogen-carbon related) and no carbon dioxide inside the glass panel at the vacuum level of 10{sup}(-6) torr.
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