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明尼阿波利斯城霍尼威尔公司的科学家研制了一种检测激光反射镜质量的新型散射计。与那种仅能测量以某角度反射光的通常的散射计不同,此种仪器还可以测量后向散射和前向散射。霍尼威尔研究人员T·C·Crook说,这种仪器是特意设计的,用以改进该公司商用环形激光陀螺仪的性能。 Crook指出:这些散射效应能以若干种不利的方式影响激光陀螺的性能。例如,散射一般是一种降低光学增益的损耗机制,不太清楚的问题是由后向散射引起的,后向散射的效应是使反向旋转的光束互相耦合。如果一束光耦合到另一束光,则每一束光的频率将相互锁住。结果,就不能确定频率差别,即使陀螺仪正在转动也无法测出频差。
Scientists at Honeywell, Minneapolis, have developed a new type of scatterometer to measure the quality of laser mirrors. Unlike conventional scatterometers that measure only light reflected at a certain angle, such instruments can also measure backscatter and forward scatter. TNC, a Honeywell researcher, said the instrument was purposely designed to improve the performance of the company’s commercial ring laser gyro. Crook notes that these scattering effects can affect the performance of a laser gyro in several unfavorable ways. For example, scattering is generally a loss mechanism that reduces optical gain. The less clear problem is caused by backscattering, which backscatters the oppositely coupled beams. If one light is coupled to the other, the frequency of each light will be locked to one another. As a result, the frequency difference can not be determined, and the frequency difference can not be measured even when the gyro is rotating.