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Accurate analysis of dissolved trace gases in transformer oil is an important technical to the power transformer operation and maintenance intelligently. Detection of multiple gases (hydrogen, carbon monoxide, carbon dioxide, methane, acetylene, ethylene and ethane) is the key of incipient transformer faults diagnosis based on dissolved gas analysis (DGA). The gas sensor based on localized surface...
This paper characterizes the pedestrian by an infrared thermal imaging system. The authors designed and conducted experiments to measure different components which, in general, compose a pedestrian. The experimental results can be used to further interpret thermal images when thermal sensors are applied for pedestrian detection.
This paper presents a novel method for image segmenting in thermal images. A thermal imaging sensor is a device that forms an image by detecting the infrared radiation from objects in a scene and comparing their temperature differences. In this study, we characterized an object's heat signature (its mean temperature and variance) by segmenting its contours in thermal images and analyzing the information...
We report a direct method to observe higher-order whispering gallery modes in vertical cavity surface emitting lasers (VCSELs) at room temperature. Instead of introducing any defect mode, we show that suppression of lower-order cavity modes can be achieved by destroying vertical reflectors with a surface micro-structure. Perfect whispering gallery modes with an azimuthal number as large as 41 are...
This paper systematically analyzes the device sensitivity of a dual waveguide coupled microring resonator sensor based on intensity detection. The relation between the device sensitivity and transmission coefficient, coupling coefficient, and operating wavelength has been derived and simulated, showing that the sensitivity can be enhanced by proper adjustment of the coupling coefficient and the operating...
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