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相关概念视频

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

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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....
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IR Spectrum01:19

IR Spectrum

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When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0%...
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Aliasing01:18

Aliasing

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Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original...
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IR Spectrometers01:25

IR Spectrometers

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

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Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
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Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next...
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相关实验视频

Updated: Sep 18, 2025

Effective Analysis of Human Exposure Conditions with Body-worn Dosimeters in the 2.4 GHz Band
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用软件定义的无线收音机进行被动无线 SAW 传感器询问的频谱配套方法.

Shihao Wang1, Qi Wang1, Guopeng Zhu1

  • 1Information & Telecommunications Company, State Grid Shandong Electric Power Company, Jinan 250013, China.

Micromachines
|June 27, 2025
PubMed
概括
此摘要是机器生成的。

本研究介绍了一种更快,非代的方法,用于测量使用软件定义无线电 (SDR) 的表面声波 (SAW) 传感器频率. 新方法减少了实时监控工业设备的计算复杂性.

关键词:
看到感觉的感觉.探测器探测器探测器探测器无线传感是一种被动的无线传感.软件定义无线电 软件定义无线电频谱合适的方法.

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科学领域:

  • 电气工程 电气工程
  • 传感器技术 传感器技术
  • 信号处理 信号处理

背景情况:

  • 被动无线表面声波 (SAW) 传感器对于工业设备安全监测至关重要.
  • 软件定义无线电 (SDR) 为传统SAW审讯器提供了一种灵活,具有成本效益的替代方案.
  • 现有的SAW传感器频率估计方法是计算密集的,阻碍了实时应用.

研究的目的:

  • 开发和评估一种用于SAW频率测量的新型非代频谱配合方法.
  • 将这种方法与用于增强SAW传感系统的SDR平台集成.
  • 评估计算效率和测量准确性之间的权衡.

主要方法:

  • 使用软件定义无线电 (SDR) 平台实现表面声波 (SAW) 传感系统.
  • 开发和应用一个非代频谱拟合算法用于频率估计.
  • 通过理论分析,模拟和实验测量来评估性能,使用不同的窗口函数和快速里埃变换 (FFT) 长度.

主要成果:

  • 与传统的代算法相比,提出的非代方法显著降低了计算复杂性.
  • 实验结果表明,时间效率和SAW频率测量准确性之间存在良好的平衡.
  • 使用4096点的FFT长度实现了±3kHz的峰值到峰值精度.

结论:

  • 开发的非代频谱配合方法是基于SDR的系统中SAW频率测量的可行和高效方法.
  • 这种方法提高了SAW传感器用于工业监控的实时适用性.
  • 为成本效益高,灵活的传感器查询提供了实用解决方案.