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光谱吸收法光纤甲烷传感器性能的研究 总被引:8,自引:0,他引:8
针对单光源光谱吸收法检测甲烷气体体积分数存在很多测量误差现状,本文首先分析了用发光二极管(LED)做光源时驱动电流抖动造成的测量误差,提出了补偿此电流抖动误差以及测量环境背景光干扰误差的双波长测量方法,简述了其测量原理,重点针对双波长方法从理论上推导了其测量误差通用公式,在此基础上分析并数值模拟了温度变化导致的测量误差,给出了减小双波长温度测量误差建议.研究结果对于其他强度调制型光纤传感器具有普遍的适用价值. 相似文献
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文中介绍了驱动电流、驱动功耗的计算方法;分析了MOSFET开关过程中电流电压的变化规律;最后对常用的驱动电路解决方案及其优缺点、设计中需要注意的问题等进行了分析总结。根据MOSFET门级驱动电路的特点及设计过程中需要考虑的影响因素,为可靠、高性能的MOSFET应用设计提供参考。 相似文献
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Abstract---The stability of the drive current is very important for a laser driver, while it is difficult to maintain the current stable at a high value for the laser driver. On the other hand, the range of the drive current is expected to be as wide as possible to be applied to different kinds of lasers. In this paper, a high current laser driver for the superluminescent light emitting diode (SLED) is presented, which is used in the optic fiber gyro embedded by a 0.35 μm bipolar complementary metal-oxide-semiconductor transistor (BiCMOS) process. The laser driver provides automatic power control and certain value of current determined by the external resister. The system is based on the optic-electric feedback theory and uses the closed-loop control technique to maintain the drive current stable. The system is capable of producing stable current ranges from 4 mA to 200 mA when the value of external resister changes. 相似文献
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图1中的电路基于以前出版的设计实例(参考文献1),仅用3条I/O线路来驱动12个LED.在本应用中,电路充当电动车引擎的转速计,并在一组排列成直线或圆弧形LED上显示引擎相对速度. 相似文献