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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: Mar 16, 2026

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

Published on: November 7, 2016

Fiber-Optic Surface Temperature Sensor Based on Modal Interference.

Frédéric Musin¹, Patrice Mégret², Marc Wuilpart³

¹Electromagnetism & Telecom Department, University of Mons, Boulevard Dolez 31, Mons B-7000, Belgium. frederic.musin@umons.ac.be.

Sensors (Basel, Switzerland)

|August 3, 2016

Summary

This study introduces an optical fiber sensing technique for precise, spatially-integrated surface temperature measurement. The innovative method uses image processing of interference patterns, offering advantages over conventional infrared thermography.

Keywords:

few-mode fiber optic interferometer sensor surface thermometry temperature

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Area of Science:

Optical Fiber Sensing
Temperature Measurement
Interference Pattern Analysis

Background:

Spatially-integrated surface temperature sensing is crucial for process control, hazard detection, and equipment/personnel safety.
Fiber-optic sensing utilizing modal interference demonstrates high sensitivity to temperature variations.
Cost-effective image processing of few-mode interference patterns is a key aspect of this technology.

Purpose of the Study:

To develop and validate an innovative fiber-optic sensing technique for spatially-integrated surface temperature measurement.
To incorporate cooling and heating phase discrimination functionality for enhanced measurement precision.
To evaluate the performance of the proposed optical technique against conventional measurement systems.

Main Methods:

Employed fiber-optic sensing based on modal interference.
Utilized cost-effective image processing of few-mode interference patterns for temperature analysis.
Applied the technique to measure the integrated surface temperature of a hollow cylinder.

Main Results:

The proposed optical temperature sensing technique demonstrated results consistent with a reference system (infrared camera and precision temperature probe).
Achieved innovative cooling and heating phase discrimination functionality.
Enabled more precise temperature measurements solely based on interference pattern image processing.

Conclusions:

The optical technique offers a viable and accurate alternative for integrated surface temperature monitoring.
Advantages include low heat capacity measurement errors, simplified spatial deployment, and continuous monitoring of non-visually accessible surfaces.
The method eliminates the need for multiple-angle infrared camera shooting.