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Related Concept Videos

Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

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The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...
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Temperature Measurement Sites01:14

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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.
Oral: When assessing oral temperature, the thermometer tip should be placed under the tongue in the posterior sublingual pocket. It offers accurate readings and can be...
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Thermal Strain01:19

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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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Fabrication and Testing of Photonic Thermometers
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High-precision strain-insensitive temperature sensor based on an optoelectronic oscillator.

Danqi Feng, Li Kai, Tao Zhu

    Optics Express
    |December 28, 2019
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    Summary

    A novel optoelectronic oscillator (OEO) temperature sensor offers high precision and strain immunity. This advanced sensor utilizes stimulated Brillouin scattering (SBS) for accurate temperature measurement, unaffected by strain.

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    Area of Science:

    • Photonics
    • Sensing Technology
    • Materials Science

    Background:

    • Optoelectronic oscillators (OEOs) are crucial for precise frequency generation.
    • Stimulated Brillouin scattering (SBS) offers a mechanism for sensing physical parameters.
    • Existing temperature sensors often suffer from strain cross-sensitivity.

    Purpose of the Study:

    • To develop a high-precision, strain-insensitive temperature sensor.
    • To leverage optoelectronic oscillator (OEO) technology for enhanced sensing capabilities.
    • To demonstrate a novel sensing mechanism based on stimulated Brillouin scattering (SBS).

    Main Methods:

    • Utilizing an optoelectronic oscillator (OEO) with a microwave photonic filter (MPF).
    • Employing a sensing fiber as the SBS gain medium to detect temperature variations.
    • Exploiting Brillouin frequency shift (BFS) changes to modulate the OEO oscillation frequency.
    • Implementing mode competition within the OEO to eliminate strain influence.

    Main Results:

    • Achieved a high temperature sensitivity of 1.00745 MHz/°C.
    • Demonstrated a maximum temperature measurement error within ±0.5 °C.
    • Confirmed strain-insensitivity due to OEO mode competition.
    • Showcased a simple and compact sensor configuration.

    Conclusions:

    • The proposed OEO-based sensor provides accurate and strain-insensitive temperature measurements.
    • The technology is suitable for quasi-distributed sensing applications using wavelength division multiplexing (WDM).
    • This approach offers a promising solution for high-performance temperature monitoring in various fields.