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Related Concept Videos

Temperature Measurement Sites01:14

Temperature Measurement Sites

4.3K
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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IR Spectrometers01:25

IR Spectrometers

3.1K
There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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Equipments Used to Measure Body Temperature01:13

Equipments Used to Measure Body Temperature

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Body temperature can be assessed using various devices and measured in Celsius or Fahrenheit.
Glass-bulb Thermometer:
Glass-bulb thermometers are hollow glass tubes with a bulb tip containing liquid such as ethanol or mercury. Historically, glass bulb mercury thermometers were the standard device to measure body temperature. Today, mercury thermometers are prohibited in many countries due to the hazardous effects of mercury and the risk of exposure if the glass bulb breaks. In general,...
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Related Experiment Video

Updated: May 5, 2026

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

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A fiber optic temperature sensor based on parallel dual Fabry-Pérot interferometers with Vernier-effect.

Xinyu Wang, Yufei Zhang, Rong Long

    Optics Express
    |May 4, 2026
    PubMed
    Summary

    A novel PDMS-optical fiber sensor utilizes the Vernier effect for highly sensitive temperature detection. This compact Fabry-Pérot interferometric (FPI) device offers improved accuracy for diverse industrial applications.

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    Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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    Author Spotlight: Fabrication of a Low-Cost, Fiber-Coupled, and Air-Spaced Fabry-Pérot Etalon
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    Author Spotlight: Fabrication of a Low-Cost, Fiber-Coupled, and Air-Spaced Fabry-Pérot Etalon
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    Author Spotlight: Fabrication of a Low-Cost, Fiber-Coupled, and Air-Spaced Fabry-Pérot Etalon

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    Area of Science:

    • Optoelectronics
    • Fiber Optic Sensors
    • Material Science

    Background:

    • Fabry-Pérot interferometers (FPIs) are widely used for sensing applications.
    • Conventional FPI sensors often face limitations in sensitivity and stability.
    • Polydimethylsiloxane (PDMS) offers unique thermo-optic properties suitable for temperature sensing.

    Purpose of the Study:

    • To propose and demonstrate a novel PDMS-optical fiber FPI temperature sensor.
    • To leverage the Vernier effect for enhanced temperature sensitivity.
    • To evaluate the sensor's performance in terms of sensitivity, linearity, and reversibility.

    Main Methods:

    • Fabrication of a compact FPI sensing probe using PDMS and single-mode fibers (SMFs).
    • Construction of a reference probe using SMFs and hollow-core fiber (HCF).
    • Exploitation of the Vernier effect by cascading two FPI cavities with slightly different free spectral ranges (FSRs).

    Main Results:

    • The proposed sensor achieved a high temperature sensitivity of approximately 21.54 nm/°C within the 25-30 °C range.
    • Excellent linearity (>99.975%) and good temperature reversibility were observed.
    • The Vernier effect significantly amplified the spectral shift, enhancing sensing sensitivity compared to conventional PDMS FPI sensors.

    Conclusions:

    • The PDMS-optical fiber FPI sensor based on the Vernier effect offers a promising solution for high-sensitivity temperature measurement.
    • The compact design and enhanced sensitivity make it suitable for various demanding applications.
    • Further development could lead to widespread adoption in industrial, medical, environmental, and aerospace fields.