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Related Concept Videos

Temperature and Thermal Equilibrium01:11

Temperature and Thermal Equilibrium

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Heat and temperature are essential concepts for everyone every day. The study of heat and temperature is part of an area of physics known as thermodynamics. It is not always easy to distinguish heat and temperature.
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A thermometer measures body temperature. The common sites for measuring body temperature are the oral cavity, axillary region, temporal artery, and skin surface, such as the forehead, abdomen, and axilla. True core body temperature is assessed in the rectum, tympanic membrane, pulmonary artery, esophagus, and urinary bladder.
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Body temperature can be assessed using various devices and measured in Celsius or Fahrenheit.
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Thermal expansion and Thermal stress: Problem Solving01:27

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San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
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The Collision Theory
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Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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Using a Thermal Camera to Measure Heat Loss Through Bird Feather Coats
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Quantitative traceable temperature measurement using novel thermal imaging camera.

Matthew J Hobbs, Chengxi Zhu, Matthew P Grainger

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    This study introduces a novel single-pixel camera using MEMS mirrors and silicon avalanche photodiodes for quantitative thermal imaging. This technology overcomes limitations of traditional focal-plane array cameras, offering improved accuracy and reduced measurement uncertainty.

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    Area of Science:

    • Optical Engineering
    • Sensor Technology
    • Metrology

    Background:

    • Conventional focal-plane array (FPA) thermal cameras suffer from stray radiation, cross-talk, and pixel calibration issues.
    • Single-element radiation thermometers offer high accuracy for single points but lack imaging capabilities.
    • There is a need for imaging systems that combine the accuracy of single-point measurements with the ability to generate thermal images.

    Purpose of the Study:

    • To develop and demonstrate a single-pixel camera system for quantitative thermal imaging.
    • To overcome the limitations of FPA-based thermal imaging cameras.
    • To achieve high accuracy and low uncertainty in thermal measurements over a wide field of view.

    Main Methods:

    • Utilized a micromechanical systems (MEMS) mirror for scanning a +/- 30° field of view in both x and y dimensions.
    • Employed a silicon (Si) avalanche photodiode (APD) as the single detector element.
    • Integrated a custom-designed f-theta wide-angle lens to ensure no vignetting across the field of view.

    Main Results:

    • The single-pixel camera successfully produced quantitative thermal images at a 1 µm operating wavelength.
    • Demonstrated a low size-of-source effect (SSE) related temperature error of 3 °C.
    • Achieved a noise-related measurement uncertainty of ± 0.5 °C for temperatures below 700 °C.
    • Measurements were calibrated and traceable to the International Temperature Scale of 1990 (ITS-90).

    Conclusions:

    • The developed MEMS mirror and Si APD-based single-pixel camera offers a viable alternative to FPA cameras for quantitative thermal imaging.
    • The system's low SSE and absence of vignetting enable superior measurement uncertainty compared to FPA systems.
    • This technology holds promise for applications requiring accurate, wide-field thermal imaging with reduced systematic errors.