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相关概念视频

Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

590
The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
590
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

208
Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
208

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相关实验视频

Updated: Jun 24, 2025

Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements
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基于非对称的双侧带检测的道化多频度测量系统.

Yuzheng Jiang, Jing Li, Miaoxia Yan

    Applied optics
    |June 10, 2024
    PubMed
    概括

    这项研究引入了一种新系统,用于准确测量微波信号频率,使用非对称双侧带检测. 拟议的方法有效地解决了频率模糊性,并在广泛的频率范围内实现了高精度.

    科学领域:

    • 光子学和光学工程的工程.
    • 微波工程 微波工程
    • 信号处理 信号处理

    背景情况:

    • 精确的频率测量对于各种微波应用至关重要.
    • 现有的方法可能会受到频率模糊性和有限的带宽的影响.

    研究的目的:

    • 提出一种新的道化多频度测量系统.
    • 为了实现微波信号的高精度,明确的频率测量.

    主要方法:

    • 使用双平行马赫-泽恩德调制器用于光学频率 (OFC) 生成和信号调制.
    • 使用非对称的双侧带检测与频率下降转换.
    • 应用牙波电压以打破对称性,并使上下侧带之间进行校准.

    主要成果:

    • 模拟显示了微波信号的多频度测量能力.
    • 在2.2-20 GHz范围内的2 MHz以下的测量误差.
    • 成功解决并解决了频率模两可的问题.

    结论:

    • 拟议的系统为准确和明确的微波频率测量提供了一个强大的解决方案.
    • 不对称的双侧带检测方法提供了更高的测量精度.

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  • 这种技术在先进的通信和雷达系统中具有潜在的应用.