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Related Concept Videos

The Electromagnetic Spectrum02:37

The Electromagnetic Spectrum

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The electromagnetic spectrum consists of all the types of electromagnetic radiation arranged according to their frequency and wavelength. Each of the various colors of visible light has specific frequencies and wavelengths associated with them, and you can see that visible light makes up only a small portion of the electromagnetic spectrum. Because the technologies developed to work in various parts of the electromagnetic spectrum are different, for reasons of convenience and historical...
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The Electromagnetic Spectrum01:24

The Electromagnetic Spectrum

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Electromagnetic waves are categorized according to their wavelengths and frequencies, giving the electromagnetic spectrum. These waves are classified as radio, infrared, ultraviolet, etc. Radio waves refer to electromagnetic radiation with wavelengths ranging from millimeters to kilometers. Radio waves are commonly used for audio communications (i.e., radios) and typically result from an alternating current in the wires of a broadcast antenna. They cover a broad wavelength range and are 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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Distribution of Stresses in a Narrow Rectangular Beam01:11

Distribution of Stresses in a Narrow Rectangular Beam

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In studying beam stress distribution, examining an elemental section is essential. To determine the average shearing stress on this face, the calculated shear is divided by the surface area. Importantly, shearing stresses on the beam's transverse and horizontal planes mirror each other, indicating a consistent stress distribution along the upper region of the beam. Notably, shearing stresses are absent at the beam's upper and lower surfaces due to the absence of applied forces in these...
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Mass Spectrum01:23

Mass Spectrum

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A mass spectrum is the graphical representation of the relative abundance of the charged fragments in an analyte plotted against their mass-to-charge ratio (m/z). The plot's x-axis represents the ratio of the mass of the charged fragment to the number of charges it carries. The y axis of the plot represents the relative abundance of each charged species. The relative abundance is calculated from the signal intensity of each charged species recorded at the detector. The most intense signal (the...
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UV–Vis Spectrum01:30

UV–Vis Spectrum

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When light passes through a substance, a portion of the light is absorbed while the remaining light is reflected or transmitted. If the molecule absorbs light between the wavelengths of 180–400 nm range, the UV spectrum is obtained, and if it absorbs light in the 400–780 nm wavelength range, the visible spectrum is obtained.     
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In vivo Bioluminescent Imaging of Mammary Tumors Using IVIS Spectrum
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Imaging Through Fire Using Narrow-Spectrum Illumination.

Christopher M Smith1, Matthew S Hoehle2

  • 1Berkshire Hathaway Specialty Insurance, 100 Federal Street, 20 Floor, Boston, MA, 02110, USA.

Fire Technology
|April 19, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method using blue light and filters to see through flames, significantly improving optical metrology in fire research. This technique reduces illumination needs by 10,000 times, enabling clearer images in intense fires.

Keywords:
Blue lightDigital Image CorrelationFireImagingMetrologyNarrow-spectrum illumination

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Area of Science:

  • Combustion Science
  • Optical Metrology
  • Fire Research

Background:

  • Optical emissions from hot targets and flames obscure visibility.
  • Traditional optical methods struggle with the harsh conditions of fire environments.
  • Advanced techniques are needed for accurate measurements in fires.

Purpose of the Study:

  • To present a method for enhancing visibility in flames for optical metrology.
  • To enable new qualitative and quantitative measurements in fire research.
  • To reduce the required illumination for imaging within flames.

Main Methods:

  • Utilizing narrow-spectrum, blue illumination.
  • Employing matched optical filters to suppress flame emissions.
  • Applying basic combustion and optical principles for system design.

Main Results:

  • Reduced influence of optical emissions from hot targets and diffusion flames.
  • Illumination requirements decreased by a factor of 10,000 compared to white light.
  • Successful imaging of objects in natural gas fires up to 1000 kW with 200 W illumination.

Conclusions:

  • The described method significantly enhances visibility in flames.
  • This technique opens new avenues for optical metrology in fire research.
  • The method is effective and requires substantially less illumination power.