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Related Concept Videos

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The study of music provides many examples of the superposition of waves and the constructive and destructive interference that occurs. Very few examples of music being performed consist of a single source playing a single frequency for an extended period of time. A single frequency of sound for an extended period might be monotonous to the point of irritation, similar to the unwanted drone of an aircraft engine or a loud fan. Music is pleasant and exciting due to mixing the changing frequencies...
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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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Time and frequency -Domain Interpretation of Phase-lead Control01:24

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Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
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Time and frequency -Domain Interpretation of Phase-lag Control01:21

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Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
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Optical differential temperature measurement with beat frequency phase fluorometry.

Dmitri Lanevski, Koit Mauring, Eric R Tkaczyk

    Applied Optics
    |November 22, 2018
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    We developed a new differential temperature sensor using thermographic phosphors. This sensor measures temperature differences by analyzing fluorescence lifetime changes, achieving high sensitivity.

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    Area of Science:

    • Materials Science
    • Optical Physics
    • Sensor Technology

    Background:

    • Differential temperature measurement is crucial in various scientific and industrial applications.
    • Existing methods may have limitations in sensitivity or applicability.
    • Thermographic phosphors offer unique optical properties sensitive to temperature variations.

    Purpose of the Study:

    • To introduce a novel method for differential temperature measurement.
    • To leverage the thermal sensitivity of fluorescence lifetime in thermographic phosphors.
    • To demonstrate the feasibility of a fluorometric differential temperature sensor.

    Main Methods:

    • Exciting pairs of thermographic phosphors with intensity-modulated light at specific frequencies.
    • Measuring the phase shift of the fluorescence intensity beat signal envelope.
    • Developing and testing a prototype sensor using a Sm2+:SrFCl crystal.

    Main Results:

    • Experimental demonstration of the fluorometric differential temperature sensing method.
    • Observed linear relationship between phase shift and temperature difference, matching theoretical predictions.
    • Achieved a high sensitivity of S=-0.97°/°C.

    Conclusions:

    • The developed method provides a sensitive approach for differential temperature measurement.
    • The technique is based on the reliable principle of fluorescence lifetime thermal sensitivity.
    • This method has potential applications beyond temperature sensing, applicable to other parameters influencing fluorescence lifetime.