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Counting is the type of measurement that is free from uncertainty, provided the number of objects being counted does not change during the process. Such measurements result in exact numbers. By counting the eggs in a carton, for instance, one can determine exactly how many eggs are there in the carton. Similarly, the numbers of defined quantities are also exact. For example, 1 foot is exactly 12 inches, 1 inch is exactly 2.54 centimeters, and 1 gram is exactly 0.001 kilograms. Quantities...
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Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over...
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单维尼尔方法用于精确的光频测量.

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    科学领域:

    • 光学物理学 光学物理学
    • 计量学 计量学 计量学
    • 频谱学是一种光谱学.

    背景情况:

    • 精确的激光频率测量对于计量学和光谱学至关重要.
    • 传统方法通常需要高精度波长计和严格的波动控制.

    研究的目的:

    • 开发一种使用单一光学频率 (OFC) 进行激光频率测量的简化方法.
    • 为了减少对高精度波长计的依赖,并放松波动要求.

    主要方法:

    • 在OFC中利用维尼尔效应以几何增加模数差异.
    • 顺序稳定OFC,以准确地确定模数.

    主要成果:

    • 展示了一种用单个OFC测量激光频率的方法.
    • 在模式间距的相对波动下实现了强大的性能 (高达3.6 × 10-10).
    • 能够准确可靠地确定模号码.

    结论:

    • 拟议的方法为激光频率测量提供了更简单,更稳定的方法.
    • 显著放松了波动要求,扩大了计量学和精密光谱学的应用.