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Related Concept Videos

Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

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Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over...
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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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Updated: Sep 30, 2025

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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Shipborne expendable all-optical fiber ocean temperature-depth profile sensor.

Qiang Zhao, Yinglong Wang, Peng Sun

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    |March 17, 2022
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    A new all-optical fiber expendable bathythermograph (AOF-XBT) uses fiber Bragg gratings to measure ocean temperature and depth simultaneously. This innovative technology offers a reliable alternative to traditional methods for oceanographic observations.

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    Area of Science:

    • Oceanography
    • Sensor Technology
    • Optical Engineering

    Background:

    • Traditional expendable bathythermographs (XBTs) infer depth from a known fall rate.
    • This method has limitations in accuracy and real-time data acquisition.
    • A novel approach is needed for precise, simultaneous temperature and depth measurements in the ocean.

    Purpose of the Study:

    • To propose and validate an all-optical fiber expendable bathythermograph (AOF-XBT).
    • To demonstrate simultaneous measurement of ocean temperature and depth using fiber Bragg gratings (FBGs).
    • To present a new all-optical technique for full ocean temperature-depth profiling.

    Main Methods:

    • Designed an AOF-XBT utilizing a cascade of two FBGs.
    • Analyzed pressure and temperature response characteristics using finite element method.
    • Performed temperature and pressure calibrations after packaging the AOF-XBT sensors.
    • Validated the AOF-XBT against a CTD (Conductivity, Temperature, Depth) instrument.

    Main Results:

    • The AOF-XBT demonstrated mean temperature sensitivities of 14.765 and 13.705 pm/°C (5°C-30°C).
    • Mean pressure sensitivities were -2.75586 and -3.00472 nm/MPa (0-0.6 MPa).
    • Temperature-depth profiles from AOF-XBT were consistent with SBE 911plus CTD data.

    Conclusions:

    • The developed AOF-XBT provides accurate, simultaneous temperature and depth measurements.
    • This all-optical technique offers a promising advancement for oceanographic temperature-depth profiling.
    • The AOF-XBT presents a viable alternative to traditional XBT systems.