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A high power LED light-distribution modeling is proposed in this paper. A fitting polynomial of the double Gaussian curve is derived from the illumination measurement of a single LED. The luminance in the lighting area can be balanced by adjusting the lamp current individually according to the optical contour of each LED. From the laboratory experiments, the superposition of the luminance which is...
In consideration of the complex condition of down hole environment, an ESP down hole multi-parameter comprehensive measurement system was designed in this paper in order to monitor the down hole information. Firstly, structures of the up hole section and down hole section of the system were introduced respectively. Then some key technologies on the system were illustrated in detail which consists...
This paper demonstrates an optical fiber sensor using fiber Bragg grating (FBG) and a piezo-electrical transducer (PZT) to measure reactive current. Mounting an FBG on a PZT bar, a dynamic strain simulator was constructed. The equivalent voltage produced by reactive current applied on PZT was converted to the dynamic variation of the FBG Bragg wavelength. The reactive current will be achieved by measuring...
We report here the study of synthesis and characterization of length-tunable vertically-aligned CuO nanowires grown by thermal oxidation of electrodeposited Cu films. From TEM and electron diffraction analyses, all the CuO nanowires produced were single crystalline with a monoclinic structure. For samples oxidized at different temperatures, the lengths of CuO nanowires were found to increase parabolically...
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