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Related Concept Videos

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...
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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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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 7, 2025

Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics
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Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics

Published on: August 30, 2024

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Passive temperature sensing through chipless vanadium dioxide metasurface tags.

Fuwei Wang1, Rong Sun2, Xuechen Zhang2

  • 1School of Information Technology, Northwest University, Xi'an, 710127, Shaanxi, China. wfw@nwu.edu.cn.

Scientific Reports
|December 31, 2024
PubMed
Summary

This study presents a passive, battery-free temperature sensing tag using vanadium dioxide. The novel metasurface design enables accurate and rapid temperature monitoring in the 34-42°C range without active components.

Keywords:
[Formula: see text] coatingFrequency selective surfacePhase transition temperatureTemperature sensing

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Internet of Things (IoT)

Background:

  • Passive temperature sensing systems offer efficient, reliable, and convenient solutions for monitoring.
  • Active devices often face challenges with measuring distance, size, and cost.

Purpose of the Study:

  • To introduce a passive, battery-free, chipless, metasurface temperature sensing tag.
  • To utilize vanadium dioxide for improved temperature sensing capabilities.

Main Methods:

  • Fabrication of a sensing tag using tungsten-doped vanadium dioxide powder.
  • Application of coating, sintering, metasurface design, and ion beam etching techniques.
  • Characterization of reflection magnitude and square resistance variations with temperature.

Main Results:

  • Demonstrated significant reflection magnitude variation within the 34-42°C temperature range.
  • Observed a decrease in square resistance from 1003 to 90 Ω as temperature increased from 34 to 42°C.
  • Reported a notable increase in tag reflection magnitude with decreasing temperature in the 3.5-5.27 GHz band.

Conclusions:

  • The developed passive temperature sensing tag achieves rapid and accurate temperature sensing.
  • The metasurface design with vanadium dioxide effectively addresses limitations of active temperature sensing devices.
  • The system shows promise for widespread application in IoT-based temperature monitoring.