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相关概念视频

Uncertainty in Measurement: Reading Instruments02:46

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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 short...
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相关实验视频

Updated: Jul 28, 2025

Implementation of a Reference Interferometer for Nanodetection
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有12位数的绝对准确度的光学无参考光学频率计数器.

Atsushi Ishizawa1,2, Tadashi Nishikawa3, Kenichi Hitachi4

  • 1NTT Basic Research Laboratories, Nippon Telegraph and Telephone Corporation, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa, 243-0198, Japan. ishizawa.atsushi@nihon-u.ac.jp.

Scientific reports
|May 30, 2023
PubMed
概括
此摘要是机器生成的。

研究人员开发了一种新方法,以高精度直接测量绝对光学频率 (AOF),消除了对光学参考的需求. 这一突破推动了光学计量技术的发展,并提高了无线通信速度.

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科学领域:

  • 计量学 计量学 计量学
  • 光学物理学的光学物理学
  • 电气工程 电气工程

背景情况:

  • 准确测量绝对光学频率 (AOF) 对于光通信和导航等先进技术至关重要.
  • 目前的方法需要一个光学参考来达到12位准确度,由于直接测量的困难,这带来了重大挑战.

研究的目的:

  • 开发一种更简单,更准确的方法来测量AOFs.
  • 在高精度的AOF测量中消除对光学参考的需求.
  • 探索电光学调制的潜力,以弥合光子学-电子学频率差距.

主要方法:

  • 使用电光学调制子来弥合光子和电子之间的频率差距.
  • 通过将一个频率未知的激光引入光学相调节器,开发了一种直接测量技术.
  • 使用无线电频率 (RF) 频率计数器进行测量.

主要成果:

  • 证明了前所未有的AOF的直接测量,精确度为12位.
  • 在传统信号发生器中实现了100倍的相位噪声降低.
  • 该方法使光学无参考光学频率计量学成为可能.

结论:

  • 这种新方法简化了AOF测量,为光学无参考计量学铺平了道路.
  • 该技术显著提高了频率测量的准确性和适用性.
  • 降低相位噪声有可能将无线通信传输速度提高约7倍.