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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: May 29, 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

Fully distributed fiber-optic temperature sensing using acoustically-induced rocking grating.

Dorothy Y Wang¹, Yunmiao Wang, Jianmin Gong

¹Center for Photonics Technology, Bradley Department of Electrical and Computer Engineering, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0111, USA. wyj026@vt.edu

|September 3, 2011

Summary

This summary is machine-generated.

A new fiber-optic temperature sensing method uses traveling rocking gratings for high sensitivity. This technique, based on acoustic waves and fiber birefringence, achieves 1000 ppm/°C sensitivity.

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Area of Science:

Optoelectronics
Fiber Optics
Sensing Technology

Background:

Distributed fiber-optic sensing offers remote measurement capabilities.
Existing techniques face limitations in sensitivity and spatial resolution.
Temperature sensing is crucial in various industrial and scientific applications.

Purpose of the Study:

To propose and demonstrate a highly sensitive fully distributed fiber-optic temperature sensing technique.
To investigate the mechanism behind the temperature sensitivity.
To explore the potential for other distributed sensing applications.

Main Methods:

Generation of a transient and traveling rocking grating using pulsed acoustic torsional waves.
Propagation of acoustic waves along an optical fiber.
Measurement of temperature sensitivity based on changes in fiber birefringence.

Main Results:

A temperature sensitivity of 1000 ppm/°C was achieved.
The high sensitivity was experimentally demonstrated to be primarily due to the temperature dependence of fiber birefringence.
The traveling rocking grating technique proved effective for distributed temperature sensing.

Conclusions:

The proposed traveling rocking grating based technique offers a highly sensitive method for fully distributed fiber-optic temperature sensing.
The technique's sensitivity is linked to the temperature-dependent properties of optical fibers.
This sensing approach holds promise for adaptation to other distributed sensing applications with specialized fiber designs.