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Related Concept Videos

Temperature Measurement Sites01:14

Temperature Measurement Sites

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...
Equipments Used to Measure Body Temperature01:13

Equipments Used to Measure Body Temperature

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,...
Assessing Body Temperature - Temporal Artery01:19

Assessing Body Temperature - Temporal Artery

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 forehead...
Thermosensation01:43

Thermosensation

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...

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Related Experiment Video

Updated: Jul 8, 2026

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
09:48

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

Published on: November 7, 2016

Cross-talk fiber-optic temperature sensor.

G Meltz1, J R Dunphy, W W Morey

  • 1United Technologies Research Center, East Hartford, Connecticut 06108, USA.

Applied Optics
|February 1, 1983
PubMed
Summary
This summary is machine-generated.

Optical fiber cross talk is temperature-dependent, showing periodic variations due to changing core contrast. This phenomenon, crucial for optical communication systems, can be precisely controlled by material and fiber design.

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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Optical fiber communication relies on minimizing signal interference between adjacent cores.
  • Understanding and controlling cross talk is essential for signal integrity in dense fiber structures.

Purpose of the Study:

  • To calculate and experimentally validate the temperature sensitivity of cross talk in closely spaced optical fiber cores.
  • To investigate methods for controlling cross talk's dependence on temperature.

Main Methods:

  • Theoretical calculation of temperature-dependent cross talk between cores within a common cladding.
  • Experimental measurements comparing predicted variations with observed core contrast changes under thermal cycling.
  • Analysis of light distribution variations attributed to core coupling changes.

Main Results:

  • Observed periodic variations in core contrast when illuminating a single core and altering temperature.
  • Experimental data on light distribution changes align with theoretical predictions of core coupling.
  • Demonstrated that cross talk can be engineered to be highly temperature-sensitive or temperature-independent.

Conclusions:

  • The temperature sensitivity of optical fiber cross talk is a predictable phenomenon.
  • Material selection, wavelength, and fiber geometry are key parameters for managing cross talk's thermal behavior.
  • Cross talk can be precisely tuned for specific applications, either enhancing or mitigating temperature dependence.