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Related Concept Videos

Radiation: Applications01:17

Radiation: Applications

The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
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High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings
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Published on: April 16, 2017

Isothermal cavity, blackbody radiation source.

F E Bliss, S Davis, B Stein

    Applied Optics
    |January 23, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A novel blackbody radiation source uses heat pipe technology for highly uniform cavity temperatures. This advanced design ensures accurate thermal radiation measurements across a wide operating range.

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    Area of Science:

    • Physics
    • Thermodynamics
    • Optical Engineering

    Background:

    • Accurate blackbody radiation sources are crucial for calibrating optical instruments and conducting thermal research.
    • Traditional sources often struggle with achieving and maintaining uniform surface temperatures, impacting measurement fidelity.
    • Heat pipe technology offers a promising solution for creating highly isothermal surfaces due to its efficient phase change heat transfer.

    Purpose of the Study:

    • To develop and characterize a prototype blackbody radiation source utilizing a double cone cavity.
    • To investigate the effectiveness of heat pipe techniques in achieving extremely uniform surface temperatures within the cavity.
    • To evaluate the optical properties, specifically lambertian distribution, of the developed blackbody source.

    Main Methods:

    • Designed a double cone cavity blackbody radiation source.
    • Integrated a heat pipe system, using the cavity as its condenser section, to supply heat.
    • Conducted optical tests to assess the radiation distribution and uniformity.
    • Operated the source within a temperature range of 419°C to 760°C.

    Main Results:

    • Achieved extremely uniform surface temperature within the double cone cavity.
    • Demonstrated the effectiveness of heat pipe technology for isothermal heating in a blackbody source.
    • Optical tests confirmed a lambertian radiation distribution over an inclusive angle exceeding 60 degrees.

    Conclusions:

    • The prototype blackbody radiation source successfully leverages heat pipe principles for high temperature uniformity.
    • The developed source exhibits excellent lambertian characteristics, suitable for precise radiometric applications.
    • This technology advances the development of reliable and accurate blackbody calibration standards.