【摘要】 本文研究了一种基于电压运算法的磁性薄膜克尔角测量方法。运用该方法可以直接由模拟电路计算得出克尔角。测试系统中使用四象限光电池代替一路光电池进行差动运算,四象限光电池同时兼有对光和光强检测的功能。文中对测量误差进行了简要的论述,分析了四象限光电池引入的系统误差和修正方法。分析和实验结果表明,该方法可以准确地测量克尔角。更多还原

【Abstract】 A method to measure Kerr rotation of magnetic film based on voltage calculation method is dis- cussed.Kerr rotation can be obtained directly from the output of analog circuit.A four-quadrant photocell is used in the system to replace photoelectric cell,and it acts both as centering detector and light intensity detector.The measurement errors of the method are briefly discussed.The system error introduced by the four-quadrant photocell and the error correction method are analyzed emphatically.Experimental results show that this method can measure Kerr rotation accurately.更多还原