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相关概念视频

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...
3.2K
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

919
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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Inductively Coupled Plasma-Mass Spectrometry (ICP-MS): Interferences01:20

Inductively Coupled Plasma-Mass Spectrometry (ICP-MS): Interferences

1.6K
Inductively coupled plasma–mass spectrometry (ICP–MS) is a highly selective and sensitive technique for accurate elemental analysis. Though the analysis of ICP–MS mass spectra is comparatively straightforward, it is affected by spectroscopic and non-spectroscopic interferences. Spectroscopic interferences arise when the plasma contains ionic species with an m/z value the same as the analyte ion. Spectroscopic interference can be categorized as isobaric, polyatomic ions, and...
1.6K
Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

2.3K
Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
2.3K
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

1.6K
A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
1.6K
Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

725
In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
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低成本的芯片尺度光谱仪通过相同厚度的干扰光谱编码来实现.

Chan Huang, Shouxin Xuan, En Li

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    概括
    此摘要是机器生成的。

    我们开发了一种低成本的芯片尺度光谱仪,使用相同厚度干扰. 这个紧的设备,通过物理约束的神经网络 (PCNN) 增强,实现了用于微型传感应用的高光谱分辨率.

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    Lensless Fluorescent Microscopy on a Chip
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    科学领域:

    • 光学和光子学 在光学和光子学.
    • 微型制造业的微型制造
    • 人工智能在光谱学中的应用

    背景情况:

    • 传统的光谱仪往往是重和昂贵的,限制了它们在便携式或微型传感系统中的应用.
    • 光谱传感技术的小型化对于扩大环境监测,医学诊断和工业过程控制等领域的应用至关重要.
    • 基于干扰的光谱编码为开发紧且具有成本效益的光谱仪提供了潜在的途径.

    研究的目的:

    • 设计和演示一个低成本的芯片尺度光谱仪,利用相同厚度干扰的原理.
    • 为了实现高光谱分辨率在一个紧的形状因子,用于实际的光谱传感.
    • 为了简化微光谱仪系统的校准过程.

    主要方法:

    • 设计了一个芯片尺度的光谱仪,使用平面凸透镜和一块平面玻璃板,涂上银,用电荷合装置 (CCD) 捕获干扰图.
    • 使用物理约束的神经网络 (PCNN) 来解码捕获的干扰图像以进行光谱分析.
    • 通过捕捉特定波长 (400 nm) 的干扰图并利用缩放关系来实现简化校准方法.

    主要成果:

    • 开发的微光谱仪在400-800nm波长范围内实现了比4.8nm更好的光谱分辨率.
    • 该光谱仪有一个紧的活性芯片大小为8.6毫米平方,整体形状因子为7厘米.
    • 基于PCNN的解码和简化校准显著提高了设备的实用性和可用性.

    结论:

    • 拟议的芯片尺度光谱仪为小型光谱传感提供了一个紧,低成本和实用的解决方案.
    • 同等厚度干扰和PCNN解码的整合证明了高分辨率微光谱学的可行方法.
    • 这项技术有可能使新一代的便携式和可访问的光谱分析工具成为可能.