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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 10, 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 temperature sensor using sampled homodyne detection.

C Gähler, S Friedrich, R O Miles

|August 14, 2010

Summary

This summary is machine-generated.

This study presents a novel homodyne detection method for fiber optic temperature sensors. The technique achieves high-resolution temperature measurements using laser frequency modulation and signal sampling.

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Area of Science:

Optoelectronics
Fiber Optics
Metrology

Background:

Fiber optic sensors offer advantages in harsh environments.
Mach-Zehnder interferometers are sensitive to phase changes.
Accurate temperature sensing is crucial in various industrial and scientific applications.

Purpose of the Study:

To develop an advanced homodyne detection method for Mach-Zehnder all-fiber temperature sensors.
To enable both AC and DC signal detection for enhanced measurement flexibility.
To achieve high-resolution temperature measurements over a specified range.

Main Methods:

Utilized laser emission frequency modulation for signal generation.
Employed sampling of the interferometer output signal for data acquisition.
Implemented fringe counting and phase change slope determination for temperature calculation.

Main Results:

Demonstrated a functional homodyne detection scheme for fiber optic temperature sensing.
Achieved measurable temperature changes within the 5-80 degrees C range.
Obtained a high resolution of 1.4 mK for temperature measurements.

Conclusions:

The proposed method provides a robust and accurate approach for fiber optic temperature sensing.
The technique allows for precise temperature monitoring with excellent resolution.
This method is suitable for applications requiring sensitive temperature detection.