论文部分内容阅读
因为光纤能够被有效地利用来测定磁场、电场和电流等的电量,所以国内外正在积极地进行研究。一种是利用光纤干涉仪的高灵敏度传感器。在磁场传感器场合,以探测10~(-6)～10~(-9)G的磁场为目标,用来探测潜艇和地质调查等。在干涉仪磁场传感器场合,利用磁场-光相位变换中Ni和金属玻璃等的磁致伸缩效应,把单模光纤卷绕在块状的磁致伸缩元件上,或者在光纤外侧包上磁致伸缩物质。基本结构是,用半导体激光器作光源,用法布里-珀罗型光纤干涉仪或马赫-参得型光纤干涉仪。对交流磁场的测量灵敏度为10~(-8)G,对直流磁场的测量灵敏度为10~(-4)G。这种传感器的特征是:灵敏度高,形状可自由选择,可在室温或低温下工作。但至今还没有关于干涉仪磁场传感器的实用化报导。磁场传感器另一个研究动向是,有效地利用光纤传感器不受电磁干扰之特性,作为电力和工业用的传感
Since optical fibers can be effectively used to measure the amount of electric power such as magnetic fields, electric fields and currents, researches are actively carried out at home and abroad. One is the use of high-sensitivity optical fiber interferometer sensor. In the field of magnetic field sensors, the detection of magnetic fields of 10 -6 -6 10 -9 G is used to detect submarines and geological surveys. In the case of an interferometer magnetic field sensor, a single-mode optical fiber is wound around a massive magnetostrictive element by using the magnetostrictive effect of Ni and metallic glass in a magnetic field-optical phase shift, or the magnetostriction substance. The basic structure is to use a semiconductor laser as a light source, a Fabry-Perot fiber optic interferometer, or a Mach-Zehnder optical fiber interferometer. The measurement sensitivity of AC magnetic field is 10 ~ (-8) G, and the measurement sensitivity of DC magnetic field is 10 ~ (-4) G. The characteristics of this sensor are: high sensitivity, the shape can be freely chosen, can work at room temperature or low temperature. But so far there is no practical report on the interferometer magnetic field sensor. Magnetic field sensor Another research trend is to effectively use the optical fiber sensor electromagnetic interference characteristics, as the sensing of electricity and industry