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An innovative gas sensor with on-chip reference using a monolithic twin laser is proposed. In this sensor a monolithic twin laser generates two closer laser beams with slight different wavelengths alternatively, one photodiode is used to catch both absorption and reference signals by time division multiplexing. The detection of nitrous oxide adopting this scheme using a 2.1μm antimonide laser and an InGaAs photodiode has been demonstrated experimentally with detection limit below 1ppm. Using this on chip reference scheme the fluctuations from the optical path and devices can be compensated effectively; the sensor system is simplified distinctly. 相似文献
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为解决政府"信息孤岛"现状,提高政府部门间数据共享和交互,从根本提高数据利用率,故建设基于CWM的ETL元数据管理系统。本设计主要基于CWM标准,利用数据的ETL技术,根据政府电子政务实际情况,结合工信部相关条例,在技术上利用先进数据抽取工具并采用成熟的数据建模方式。用户反馈情况良好,需进一步对该系统进行完善和改进,从而更好地服务电子政务的信息化建设。 相似文献
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