Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

IR Spectrometers01:25

IR Spectrometers

1.1K
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...
1.1K
Fast Fourier Transform01:10

Fast Fourier Transform

317
The Fast Fourier Transform (FFT) is a computational algorithm designed to compute the Discrete Fourier Transform (DFT) efficiently. By breaking down the calculations into smaller, manageable sections, the FFT significantly reduces the computational complexity involved. Direct computation of an N-point DFT requires N2 complex multiplications, whereas the FFT algorithm needs only (N/2)log⁡2N multiplications, offering a much faster performance.
The computational efficiency of the FFT becomes...
317
Discrete Fourier Transform01:15

Discrete Fourier Transform

275
The Discrete Fourier Transform (DFT) is a fundamental tool in signal processing, extending the discrete-time Fourier transform by evaluating discrete signals at uniformly spaced frequency intervals. This transformation converts a finite sequence of time-domain samples into frequency components, each representing complex sinusoids ordered by frequency. The DFT translates these sequences into the frequency domain, effectively indicating the magnitude and phase of each frequency component present...
275
Discrete-time Fourier transform01:26

Discrete-time Fourier transform

316
The Discrete-Time Fourier Transform (DTFT) is an essential mathematical tool for analyzing discrete-time signals, converting them from the time domain to the frequency domain. This transformation allows for examining the frequency components of discrete signals, providing insights into their spectral characteristics. In the DTFT, the continuous integral used in the continuous-time Fourier transform is replaced by a summation to accommodate the discrete nature of the signal.
One of the notable...
316
Discrete-Time Fourier Series01:20

Discrete-Time Fourier Series

262
The Discrete-Time Fourier Series (DTFS) is a fundamental concept in signal processing, serving as the discrete-time counterpart to the continuous-time Fourier series. It allows for the representation and analysis of discrete-time periodic signals in terms of their frequency components. Unlike its continuous counterpart, which utilizes integrals, the calculation of DTFS expansion coefficients involves summations due to the discrete nature of the signal.
For a discrete-time periodic signal x[n]...
262
IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

880
IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
880

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

HOXD10 promotes hepatocellular carcinoma progression by enhancing m6A methylation and activating the PI3K/AKT/mTOR pathway.

Journal of translational medicine·2026
Same author

Tilt Test Duration in Suspected Vasovagal Syncope: Temporal Patterns and Diagnostic Yield in Patients From Central China.

Pacing and clinical electrophysiology : PACE·2026
Same author

A Sacrificial Seed Layer Strategy for Hierarchical MFI Zeolite Membranes With Enhanced Butane Isomer Separation Performance.

Angewandte Chemie (International ed. in English)·2026
Same author

Sarcandra glabra alleviates intestinal injury via modulating gut microbiota and suppressing the IL-6/SOCS3 signaling pathway.

NPJ science of food·2026
Same author

Coreactant-Filled Hydrogel at Ruthenium-Labeled Brain Tissue Section for Electrochemiluminescence Imaging in Gel.

Analytical chemistry·2026
Same author

Differentiating sub-centimeter lung metastases in colorectal cancer by deep learning: a multicenter retrospective study.

BMC medical imaging·2026

相关实验视频

Updated: Jul 1, 2025

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
10:42

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

Published on: March 22, 2019

6.2K

一个新的数字中间频率模块,用于基于平行快速里叶变换算法的超光谱微波辐射仪.

Xun Gong1, Ling Tong1, Bo Gao1

  • 1School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu, Sichuan, People's Republic of China.

The Review of scientific instruments
|March 14, 2024
PubMed
概括

本研究介绍了一种新的中频 (IF) 模块用于高光谱微波射线计,增强数据处理能力. 该模块实现实时,高分辨率的光谱分析,以改善行星遥感.

更多相关视频

High-definition Fourier Transform Infrared FT-IR Spectroscopic Imaging of Human Tissue Sections towards Improving Pathology
11:05

High-definition Fourier Transform Infrared FT-IR Spectroscopic Imaging of Human Tissue Sections towards Improving Pathology

Published on: January 21, 2015

33.2K
Direct Comparison of Hyperspectral Stimulated Raman Scattering and Coherent Anti-Stokes Raman Scattering Microscopy for Chemical Imaging
09:46

Direct Comparison of Hyperspectral Stimulated Raman Scattering and Coherent Anti-Stokes Raman Scattering Microscopy for Chemical Imaging

Published on: April 28, 2022

3.9K

相关实验视频

Last Updated: Jul 1, 2025

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
10:42

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

Published on: March 22, 2019

6.2K
High-definition Fourier Transform Infrared FT-IR Spectroscopic Imaging of Human Tissue Sections towards Improving Pathology
11:05

High-definition Fourier Transform Infrared FT-IR Spectroscopic Imaging of Human Tissue Sections towards Improving Pathology

Published on: January 21, 2015

33.2K
Direct Comparison of Hyperspectral Stimulated Raman Scattering and Coherent Anti-Stokes Raman Scattering Microscopy for Chemical Imaging
09:46

Direct Comparison of Hyperspectral Stimulated Raman Scattering and Coherent Anti-Stokes Raman Scattering Microscopy for Chemical Imaging

Published on: April 28, 2022

3.9K

科学领域:

  • 遥感 遥感 遥感 遥感
  • 微波工程 微波工程
  • 信号处理 信号处理

背景情况:

  • 微波辐射仪对于行星大气和表面探测至关重要,因为它们的全天,全天候功能.
  • 超光谱检测技术为提高微波射线计测量的精度和分辨率提供了显著的潜力.

研究的目的:

  • 为超光谱微波辐射仪设计的新型中间频率 (IF) 模块进行介绍和描述.
  • 为了展示模块的实时数据处理和高通道计数输出能力.

主要方法:

  • 该IF模块集成了两个每秒6.4千兆样的模拟数字转换器 (ADC) 芯片和Xilinx Virtex-7现场可编程网关阵列 (FPGA).
  • 为了高效的实时数据处理,采用了并行快速里埃转换 (FFT) 算法和管道架构.
  • 该模块的性能通过线性,灵敏度和平面性测试以及与射频计的射频前端接口来评估.

主要成果:

  • IF模块成功地实时处理所有ADC采样数据,每个ADC生成512个输出通道.
  • 测试结果证实了模块的线性,灵敏度和平度.
  • 与前端的接口和测量校准源验证了模块的灵敏度.

结论:

  • 开发的IF模块显著提高了超光谱微波辐射仪的数据处理能力.
  • 当该模块与合适的前端接收器集成时,它会形成适用于各种微波遥感应用的多功能辐射计系统.