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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...

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Updated: Jun 11, 2026

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

Published on: December 5, 2025

Laser interferometric thermometry for substrate temperature measurement.

K L Saenger, J Gupta

|June 29, 2010

Summary

This summary is machine-generated.

This study presents a noncontact optical thermometry method using laser interferometry to measure temperature changes. The technique accurately measures temperatures up to 900°C using various stable sensor materials.

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Area of Science:

Materials Science
Optical Physics
Metrology

Background:

Accurate temperature measurement is crucial in various industrial and scientific applications.
Existing thermometry methods may have limitations in noncontact measurement or high-temperature ranges.

Purpose of the Study:

To develop and validate a simple, noncontact optical thermometry technique.
To assess the technique's applicability across a wide temperature range (room temperature to 900°C).

Main Methods:

Utilized laser interferometry to measure thermal expansion and refractive index changes in transparent substrates.
Calibrated the system at 633 nm using known temperature variations.
Investigated sensor materials including sapphire, magnesium oxide, spinel, yttria-stabilized zirconia, and fused silica.

Main Results:

Established a functional relationship between interference fringes and temperature for quantitative thermometry.
Determined the thermal coefficient of refractive index for tested materials.
Demonstrated the technique's effectiveness up to 900°C with appropriate sensor selection.

Conclusions:

The developed laser interferometric technique offers a viable noncontact method for high-temperature thermometry.
The choice of a thermally stable sensor is critical for extending the technique's operational range.
This method provides essential data for material characterization and precise temperature monitoring.