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Temperature Measurement Sites

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 Temperature

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,...

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Ultra-high temperature video extensometer: System development and experimental validation.

Liping Yu¹, Fuguo Ren¹, Xiaoying Zhang¹

¹Institute of Solid Mechanics, Beihang University, Beijing 100191, China.

The Review of Scientific Instruments

|April 30, 2022

Summary

This summary is machine-generated.

This study introduces an ultra-high temperature video extensometer that automatically adjusts camera exposure for accurate strain measurement. This innovation overcomes challenges posed by intense thermal radiation in high-temperature material testing up to 2000°C.

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Area of Science:

Materials Science
Mechanical Engineering
Optical Metrology

Background:

Traditional clip-on extensometers are limited in high-temperature material testing.
Existing video extensometers struggle with intense thermal radiation, degrading accuracy.
Rapidly changing thermal radiation from heated samples and elements causes image decorrelation.

Purpose of the Study:

To develop an ultra-high temperature video extensometer capable of reliable thermal strain measurement.
To address the limitations of current video extensometers in high-temperature environments.
To ensure high-quality images for real-time strain measurement despite intense thermal radiation.

Main Methods:

Developed an ultra-high temperature video extensometer with automatic camera exposure time adjustment.
Implemented image quality evaluation criteria to select optimal exposure settings.
Conducted static tests on tungsten-molybdenum alloy samples to assess noise levels.
Performed tensile tests on tungsten-copper, tungsten-potassium, and tungsten-molybdenum alloys up to 2000°C.

Main Results:

The developed video extensometer effectively manages intense thermal radiation.
Automatic exposure adjustment ensures high-quality images for accurate strain measurement.
Static and dynamic tests validated the system's effectiveness and accuracy up to 2000°C.

Conclusions:

The novel ultra-high temperature video extensometer provides reliable non-contact strain measurement in extreme environments.
This technology overcomes significant challenges in high-temperature material characterization.
The system demonstrates high accuracy and effectiveness for testing advanced alloys.