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Related Concept Videos

Temperature Measurement Sites01:14

Temperature Measurement Sites

1.9K
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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Equipments Used to Measure Body Temperature01:13

Equipments Used to Measure Body Temperature

1.1K
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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Thermosensation01:43

Thermosensation

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Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
30.9K
Assessing Body Temperature - Temporal Artery01:19

Assessing Body Temperature - Temporal Artery

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Here is a stepwise guide to assessing the body temperature at the temporal artery using a temporal artery thermometer
Step 1: Perform hand hygiene and don a fresh pair of gloves to prevent cross-infection and ensure patient safety.
Step 2: Explain the procedure to the patient to establish trust. Clear communication establishes trust with the patient, ensures they understand what to expect, promotes cooperation, and enhances comfort during the procedure.  
Step 3: Assess the patient's...
626
Joule-Thomson Effect01:21

Joule-Thomson Effect

4.9K
The Joule-Thomson effect, also known as the Joule-Kelvin effect, describes the temperature change of a fluid when it is forced through a valve or porous plug while keeping it in a thermally insulated environment. This experiment is called a throttling process. This is an important effect widely used in refrigeration and the liquefaction of gases.
This experiment forces high-pressure gas through a throttle valve or a porous plug to a lower-pressure region. The gas expands as it passes through to...
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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Ratiometric Temperature Sensing Using Highly Coupled Seven-Core Fibers.

Daniel A May-Arrioja1, Miguel A Fuentes-Fuentes2, Iván Hernández-Romano3

  • 1Centro de Investigaciones en Óptica, Prol. Constitución 607, Fracc. Reserva Loma Bonita, Aguascalientes 20200, Mexico.

Sensors (Basel, Switzerland)
|January 8, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a novel ratiometric sensing method using specialty fiber optics for accurate temperature monitoring. The technique enhances measurement sensitivity and stability by analyzing spectral changes in multicore fibers (MCFs).

Keywords:
multicore fiberoptical fiber sensorsseven-core fibertemperature sensor

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Area of Science:

  • Optoelectronics
  • Fiber Optics Sensing
  • Metrology

Background:

  • Accurate temperature sensing is crucial in various industrial and scientific applications.
  • Conventional fiber optic temperature sensors often face limitations in sensitivity, stability, and cost.
  • Ratiometric measurement techniques offer improved robustness against signal fluctuations.

Purpose of the Study:

  • To develop and demonstrate a ratiometric sensing approach for temperature variations using specialty fiber optic devices.
  • To investigate the feasibility of using cascaded multicore fiber (MCF) segments for ratiometric operation.
  • To enhance the sensitivity and reliability of temperature measurements compared to traditional methods.

Main Methods:

  • Analyzed the transmission response of cascaded multicore fiber (MCF) segments with dissimilar lengths.
  • Utilized the spectral behavior of intensity changes in specific peaks within the MCFs.
  • Implemented a ratiometric calculation by selecting pairs of peaks with opposite intensity trends as a function of temperature.
  • Experimentally tested the system using seven-core fiber (SCF) segments heated up to 150 °C.

Main Results:

  • Observed distinct spectral peaks with opposite intensity behaviors in response to temperature changes.
  • Achieved ratiometric temperature measurements with sensitivities 6-14 times higher than single-wavelength measurements.
  • Demonstrated enhanced sensitivity using two different pairs of selected peaks.
  • Validated the robustness of the ratiometric approach against spurious fluctuations.

Conclusions:

  • The proposed ratiometric approach using specialty MCFs provides a highly sensitive and robust method for temperature sensing.
  • This technique offers a cost-effective alternative to conventional interferometric schemes, potentially utilizing commercial components.
  • The method shows significant potential for practical implementation in various temperature monitoring applications.