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Related Concept Videos

Special considerations while measuring oxygen saturation01:19

Special considerations while measuring oxygen saturation

Assessing respiratory rate concurrently with pulse measurement is fundamental to patient care, providing valuable insights into the patient's respiratory function. The normal breathing rate for an adult usually falls within a normal range of 12 to 20 breaths per minute. Abnormal respiratory rates can signal underlying health conditions or the need for immediate intervention.
Ensuring accuracy in vital sign recordings while prioritizing patient comfort and minimizing anxiety is important. 
Flame Photometry: Overview01:02

Flame Photometry: Overview

Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
Flame Photometry: Lab01:16

Flame Photometry: Lab

In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
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Gas Thermometers and the Kelvin Scale

The definition of temperature in terms of molecular motion suggests that there should be a lowest possible temperature, where the average kinetic energy of molecules is zero (or the minimum allowed by quantum mechanics). Experiments confirm the existence of such a temperature, called absolute zero. An absolute temperature scale is one whose zero point is absolute zero. Such scales are convenient in science because several physical quantities, such as the volume of an ideal gas, are directly...
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...

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Related Experiment Video

Updated: May 30, 2026

Adsorption Device Based on a Langatate Crystal Microbalance for High Temperature High Pressure Gas Adsorption in Zeolite H-ZSM-5
09:46

Adsorption Device Based on a Langatate Crystal Microbalance for High Temperature High Pressure Gas Adsorption in Zeolite H-ZSM-5

Published on: August 25, 2016

High-temperature langasite SAW oxygen sensor.

Peng Zheng1, Tao-Lun Chin, David Greve

  • 1National Energy Technology Laboratory, Carnegie Mellon University, Pittsburgh, PA, USA. pengzheng@alumni.cmu.edu

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|August 24, 2011
PubMed
Summary

High-temperature langasite Surface Acoustic Wave (SAW) oxygen sensors demonstrated sensitivity between 500°C and 700°C. A peak sensitivity was observed around 625°C, aligning with acoustoelectric effect predictions.

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Area of Science:

  • Materials Science
  • Sensor Technology
  • Physical Chemistry

Background:

  • Surface Acoustic Wave (SAW) devices offer potential for gas sensing applications.
  • Zinc Oxide (ZnO) is a promising material for resistive gas-sensing layers due to its semiconductor properties.
  • High-temperature operation is crucial for certain industrial and environmental monitoring scenarios.

Purpose of the Study:

  • To fabricate and evaluate high-temperature langasite SAW oxygen sensors.
  • To investigate the gas-sensing performance of sputtered ZnO layers at elevated temperatures.
  • To correlate experimental findings with theoretical acoustoelectric effect predictions.

Main Methods:

  • Fabrication of langasite SAW devices.
  • Deposition of sputtered ZnO as the sensing layer.
  • Testing sensor response to oxygen gas at temperatures ranging from 500°C to 700°C.

Main Results:

  • Oxygen gas sensitivity was observed in the temperature range of 500°C to 700°C.
  • A peak sensitivity to oxygen was recorded at approximately 625°C.
  • The observed sensitivity profile aligns with theoretical predictions based on the acoustoelectric effect.

Conclusions:

  • Sputtered ZnO is a viable sensing material for high-temperature langasite SAW oxygen sensors.
  • The acoustoelectric effect plays a significant role in the sensor's high-temperature oxygen sensitivity.
  • These findings support the development of advanced SAW gas sensors for demanding environments.