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Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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Flame Photometry: Overview01:02

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Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
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Flame Photometry: Lab01:16

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In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
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Atomic Emission Spectroscopy: Lab01:29

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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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The definition of temperature in terms of molecular motion suggests that there should be a lowest possible temperature, where the average kinetic energy of molecules is zero (or the minimum allowed by quantum mechanics). Experiments confirm the existence of such a temperature, called absolute zero. An absolute temperature scale is one whose zero point is absolute zero. Such scales are convenient in science because several physical quantities, such as the volume of an ideal gas, are directly...
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NightHawk:一个低成本的夜间照明野火观测平台及其放射性校准.

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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遥感系统,使用可见和近红外 (VIS-NIR) 摄像头从空中夜间光线观测中检测自然火线. 这项技术有助于监测人口密地区附近的野火.

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飞机的遥感飞机的遥感飞机火灾检测系统的火灾检测系统.燃烧着 燃烧着 燃烧着多频段成像技术多频段成像技术夜间的火灾活动夜间的火灾活动夜间的灯光 在夜间的灯光辐射测量校准测量仪校准.野火 野火是一场野火.

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科学领域:

  • 遥感 遥感 遥感 遥感
  • 光学工程是指光学工程.
  • 野火监测 野火监测 在野火监测

背景情况:

  • 精确检测自然燃烧火线对于有效监测野火至关重要,特别是在人口密地区附近.
  • 现有的夜间光 (NTL) 观测通常缺乏特异性,无法将燃烧的生物质与其他光源区分开来.
  • 可见和近红外 (VIS-NIR) 光谱学为区分火灾特征提供了潜力.

研究的目的:

  • 介绍一个低成本的VIS-NIR遥感平台的原型,用于检测和描述自然燃烧的火线.
  • 优化平台用于空中夜间光 (NTL) 观测.
  • 执行开发系统的放射性校准.

主要方法:

  • 使用商用CMOS传感器摄像头和过器,带宽为100nm.
  • 选择过器利用770nm附近的强排放线,这是自然燃烧的特征.
  • 针对特定曝光时间 (20毫秒和2毫秒) 进行校准的摄像头,以实现高灵敏度和广泛的动态范围.

主要成果:

  • 实现了放射测量测量,灵敏度底部为3-5 × 10-6 W m-2 sr-1 nm-1 和不确定性<5%.
  • 证明了3000-4000的动态范围,扩大了10的因数,暴露时间更短.
  • 成功捕获了来自燃烧生物质的空间分辨火线的空中图像.

结论:

  • 开发的低成本VIS-NIR遥感平台有效地使用NTL观测来检测和描述自然燃烧的火线.
  • 该系统根据排放区分火灾特征的能力对于在人口密地区附近的野火监测至关重要.
  • 校准的平台提供了灵敏而准确的辐射测量,适用于空中野火检测应用.