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Comments on 'Simultaneous measurement of angular velocities of two vertical directions in a slow-light structure'

机译：关于“同时测量慢光结构中两个垂直方向的角速度”的评论

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摘要

A recent paper by Gu and Liu reported a fiber double-ring resonator gyroscope that can simultaneously measure rotation in two orthogonal axes, with a sensitivity predicted to be 35 times larger than that of an interferometric fiber optic gyroscope (IFOG). Because the two rings have different lengths, the gyroscope could not be biased properly, and the authors remark that as a result, its sensitivity to a small rotation rate is reduced. We stress that this sensor actually responds quadratically to a small applied rotation rate, and that it is therefore essentially insensitive to a small rotation rate. We point out that it could easily be biased properly and this major issue is eliminated by using two rings with nominally equal lengths. We also show that in general, and unlike claimed, this sensor does not measure rotation on orthogonal axes independently. This cross-sensitivity between axes worsens significantly when the sensor is properly biased, and it is then much too strong for inertial navigation of aircraft. A conceptual method that might reduce this cross-sensitivity is suggested. A simple physical argument is also presented to explain why this gyroscope was entirely expected to be more sensitive than an IFOG, and shows that as a result of algebraic errors, the predicted factor of 35 is actually only at most 11.
机译：Gu和Liu的最新论文报道了一种光纤双环谐振器陀螺仪，它可以同时测量两个正交轴上的旋转，其灵敏度预计将比干涉式光纤陀螺仪（IFOG）大35倍。由于两个环的长度不同，因此陀螺仪无法正确偏置，因此作者指出，结果是其对小旋转速率的灵敏度降低了。我们强调说，该传感器实际上对较小的施加转速有平方响应，因此它对较小的转速基本不敏感。我们指出，可以很容易地对它进行适当的偏置，并且通过使用两个标称长度相等的环可以消除这个主要问题。我们还表明，与要求保护的范围不同，该传感器通常不会独立测量正交轴上的旋转。当传感器正确偏置时，轴之间的这种交叉灵敏度会大大恶化，因此对于飞机的惯性导航而言，这种灵敏度太强了。建议一种可能会降低这种交叉敏感性的概念方法。还提出了一个简单的物理论证来解释为什么完全期望该陀螺仪比IFOG更为灵敏，并表明由于代数错误，预测因子35实际上最多为11。

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  • 来源
    《Optical fiber technology》 |2018年第11期|250-254|共5页
  • 作者

    Digonnet M. J. F.; Grant M. J.;

  • 作者单位

    Stanford Univ, Stanford, CA 94305 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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