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Related Concept Videos

Temperature Measurement Sites01:14

Temperature Measurement Sites

2.5K
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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Assessing Body Temperature - Tympanic membrane01:14

Assessing Body Temperature - Tympanic membrane

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Assessing tympanic membrane temperature involves using a tympanic membrane thermometer (TMT). Here is a step-by-step guide:
Step 1: Begin by practicing good hand hygiene to prevent the transmission of microorganisms.
Step 2: Turn on the thermometer and wait until the ready sign appears on the screen to ensure accurate measurement.
Step 3: Slide the probe cover in place to prevent cross-contamination.
Step 4: Instruct the patient to tilt their head to the side for comfort and check for cerumen...
855
Equipments Used to Measure Body Temperature01:13

Equipments Used to Measure Body Temperature

1.4K
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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Novel Multilayer SAW Temperature Sensor for Ultra-High Temperature Environments.

Xuhang Zhou1, Qiulin Tan1, Xiaorui Liang1

  • 1Science and Technology on Electronic Test and Measurement Laboratory, North University of China, Taiyuan 030051, China.

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|June 2, 2021
PubMed
Summary

This study introduces a new wireless Surface Acoustic Wave (SAW) temperature sensor using a langasite substrate, capable of measuring up to 1300 °C. The sensor demonstrates excellent stability and potential for extreme environments like aero-engines.

Keywords:
AlN filmsSAW sensorhigh-temperature electrodelangasite

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Area of Science:

  • Materials Science
  • Sensor Technology
  • Acoustics

Background:

  • High-temperature measurements in aero-engines require robust wireless sensors.
  • Surface Acoustic Wave (SAW) sensors offer a viable solution for extreme environments.
  • Existing sensors face limitations in extreme temperature and harsh conditions.

Purpose of the Study:

  • To develop and characterize a novel SAW temperature sensor for ultra-high temperature applications.
  • To evaluate the performance and stability of the sensor up to 1300 °C.
  • To investigate the protective role of an AlN passivation layer on sensor components.

Main Methods:

  • Fabrication of a SAW sensor utilizing a langasite (LGS) substrate.
  • Deposition of an AlN passivation layer on Pt electrodes via pulsed laser.
  • High-temperature radio-frequency (RF) testing to determine resonant frequency and temperature correlation.
  • Microstructural analysis using Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD).

Main Results:

  • The developed SAW sensor successfully operated at temperatures up to 1300 °C.
  • An AlN passivation layer enhanced Pt film crystallization and ensured device stability at 1100 °C.
  • A linear relationship between resonant frequency and temperature was confirmed through RF testing.
  • Microstructural analysis validated the integrity of the AlN/Pt/Cr thin-film electrode after high-temperature exposure.

Conclusions:

  • The proposed AlN/Pt/Cr thin-film electrode demonstrates significant potential for high-temperature SAW sensor applications.
  • The langasite-based SAW sensor is a promising candidate for wireless temperature monitoring in extreme environments.
  • The AlN passivation layer is crucial for maintaining sensor functionality and stability at elevated temperatures.