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相关概念视频

Design Example: Underdamped Parallel RLC Circuit01:17

Design Example: Underdamped Parallel RLC Circuit

296
Consider designing an oscillator circuit, a crucial component in various electronic devices and systems. The objective is to create an oscillator circuit with specific characteristics: a damped natural frequency of 4 kHz and a damping factor of 4 radians per second. To accomplish this, a parallel RLC circuit is employed, known for its ability to sustain oscillations at a resonant frequency. In this case, the damping factor is pivotal in achieving the desired performance.
Starting with a fixed...
296
Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

651
In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
651

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相关实验视频

Updated: Jul 8, 2025

Fabrication and Characterization of Superconducting Resonators
10:26

Fabrication and Characterization of Superconducting Resonators

Published on: May 21, 2016

11.4K

基于低温共振器的光学频率参考.

Eugen Wiens, Chang Jian Kwong, Timo Müller

    Optics express
    |December 13, 2023
    PubMed
    概括

    我们开发了一个低温光学参考激光器,用于精确的频率测量. 该系统实现了高稳定性,显示了高级计时应用的潜力.

    科学领域:

    • 物理 物理学 物理
    • 计量学 计量学 计量学
    • 光学工程是指光学工程.

    背景情况:

    • 光学原子钟需要高度稳定的激光源.
    • 光学共振器的低温运行可以减少热噪声并提高稳定性.
    • 振动和温度波动是实现高性能光学引用的关键挑战.

    研究的目的:

    • 开发和描述一个稳定到冷光学共振器的1.5微米激光器.
    • 为了研究低温光学参考的频率不稳定性和漂移.
    • 确定当前系统中的噪音来源和局限性.

    主要方法:

    • 稳定一个1.5微米激光器到一个光学共振器.
    • 响应器在1.7K的闭环冷静电机内运行,并具有被动振动隔离.
    • 频率不稳定性测量在各种整合时间 (1秒到6000秒).

    主要成果:

    • 在1秒的集成时间实现了2 × 10−14的频率不稳定性,受到残余振动的限制.
    • 证明频率不稳定性为6.2 × 10−15在100秒和3.5 × 10−16在6000秒.
    • 在190天的时间里,测量了 -3.7 × 10−20/s的平均分数频率漂移率.

    更多相关视频

    A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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    A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

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    Implementation of a Reference Interferometer for Nanodetection
    16:11

    Implementation of a Reference Interferometer for Nanodetection

    Published on: April 26, 2014

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    相关实验视频

    Last Updated: Jul 8, 2025

    Fabrication and Characterization of Superconducting Resonators
    10:26

    Fabrication and Characterization of Superconducting Resonators

    Published on: May 21, 2016

    11.4K
    A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
    09:03

    A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

    Published on: January 7, 2019

    7.2K
    Implementation of a Reference Interferometer for Nanodetection
    16:11

    Implementation of a Reference Interferometer for Nanodetection

    Published on: April 26, 2014

    9.4K

    结论:

    • 低温光学参考显示了高精度光学频率传播的有希望的性能.
    • 其余振动和实验室温度变化显著影响短期到中期稳定性.
    • 进一步减轻环境因素可能使得响应器的热噪声性能达到限制.