In this paper we study the structure of panda fibers how to effect the birefringence (beat length) by an infinitesimal element method.
本文用微元算法研究了熊猫光纤的结构参量对熊猫光纤双折射特性(拍长)的影响。
In this paper, we describe the basic principle of polarization maintaining optical fiber and the method to measure the beat length of PM optical fiber.
本文叙述了保偏光纤能够保证传输光波偏振特性的基本原理，介绍了测量保偏光纤拍长的基本方法。
One of the most important parameters about high birefringence fibers is the beat length. Because of its shortness and periodicity, measuring beat length is a critical one.
高双折射光纤的一个重要参数是拍长，由于拍长很短和周期性变化，如何实现准确测量是十分困难的。
In the cladding while counting in the phase change, using the transverse shift and the phase change of the total reflected light, we derive the beat length formula of the isotrope fiber.
利用全反射光在光纤包层中的横向偏移和相位变化导出了全反射拍长计算公式。
This causes what we call Long QT syndrome, where the length of the heart beat is longer than usual, which greatly increases the risk of arrhythmia.
这可导致所谓的长Q-T综合症。此时心律的长度较正常时延长，可大大增加心律失常的风险。
The parameters considered include the mean beam length of flue gas, the emissivity of gas, the film beat transfer coefficient and the enthalpy of flue gas.
这些参数包括烟气的平均辐射长度、烟气黑度、对流传热系数、烟气的热焓等。
Based on the random variation of cavity length, characteristics of the medium index and mode competition effect, low-frequency beat and noise continuums are explained.
根据腔长的随机变化、介质色散特性和模竞争效应解释了低频拍和连续噪声谱。
The influence of time length and beat frequency on radar range is discussed.
讨论了信号时长和差拍频率对雷达作用距离的影响；
The influence of time length and beat frequency on radar range is discussed.
讨论了信号时长和差拍频率对雷达作用距离的影响；
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