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Related Concept Videos

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

Atomic Emission Spectroscopy: Lab

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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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Calorimetry

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When objects at different temperatures are placed in contact with each other but isolated from everything else, they attain thermal equilibrium. A container that prevents heat transfer in or out is called a calorimeter, and the use of a calorimeter to make measurements is called calorimetry. Generally, these measurements involve heat or specific heat capacity. The term "calorimetry problem" is used for any problem where the specified objects are thermally isolated from their...
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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: A Low-Cost, Nighttime Light Wildfire Observation Platform and Its Radiometric Calibration.

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Sensors (Basel, Switzerland)
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Summary
This summary is machine-generated.

We developed a low-cost remote sensing system using visible and near-infrared (VIS-NIR) cameras to detect natural fire fronts from airborne nighttime light observations. This technology helps monitor wildfires near populated areas.

Keywords:
aircraft remote sensingfire detectionflamingmultiband imagingnighttime fire activitynighttime lightsradiometric calibrationwildfire

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Area of Science:

  • Remote Sensing
  • Optical Engineering
  • Wildfire Monitoring

Background:

  • Accurate detection of natural flaming fire fronts is crucial for effective wildfire monitoring, especially near populated areas.
  • Existing nighttime light (NTL) observations often lack the specificity to distinguish burning biomass from other light sources.
  • Visible and near-infrared (VIS-NIR) spectroscopy offers potential for differentiating fire signatures.

Purpose of the Study:

  • To present a low-cost prototype of a VIS-NIR remote sensing platform for detecting and characterizing natural flaming fire fronts.
  • To optimize the platform for airborne nighttime light (NTL) observations.
  • To perform radiometric calibration of the developed system.

Main Methods:

  • Utilized commercially available CMOS sensor cameras and filters with ~100 nm bandwidths.
  • Selected filters to exploit the strong potassium emission line near 770 nm characteristic of natural flaming.
  • Calibrated cameras for specific exposure times (20 ms and 2 ms) to achieve high sensitivity and wide dynamic range.

Main Results:

  • Achieved radiometric measurements with a sensitivity floor of 3-5 × 10-6 W m-2 sr-1 nm-1 and uncertainties <5%.
  • Demonstrated dynamic ranges of 3000-4000, extended by a factor of 10 with shorter exposure times.
  • Successfully captured airborne images of a spatially resolved fire front from flaming biomass.

Conclusions:

  • The developed low-cost VIS-NIR remote sensing platform is effective for detecting and characterizing natural flaming fire fronts using NTL observations.
  • The system's ability to discriminate fire signatures based on potassium emission is critical for wildfire monitoring near populated areas.
  • The calibrated platform provides sensitive and accurate radiance measurements suitable for airborne wildfire detection applications.