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Related Concept Videos

Temperature Measurement Sites01:14

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 Temperature01:13

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,...
Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55 °C.
Thermal Stress01:09

Thermal Stress

If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
Thermal Strain01:19

Thermal Strain

Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
Thermosensation01:43

Thermosensation

Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...

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Related Experiment Video

Updated: Jul 3, 2026

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
09:48

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

Published on: November 7, 2016

High temperature fiber sensor with high sensitivity based on core diameter mismatch.

Linh Viet Nguyen1, Dusun Hwang, Sucbei Moon

  • 1Department of Information and Communications, School of Photon Science and Technology, Gwangju Institute of Science and Technology, Buk-gu, Gwangju, Korea.

Optics Express
|July 24, 2008
PubMed
Summary
This summary is machine-generated.

A novel fiber optic sensor using a multimode-single mode-multimode (MM-SM-MM) configuration accurately measures high temperatures up to 900°C. This simple, sensitive sensor exhibits a wavelength shift with temperature variations.

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Area of Science:

  • Fiber optic sensing
  • High-temperature measurement
  • Optical physics

Background:

  • Accurate high-temperature measurement is crucial in various industrial and scientific applications.
  • Existing fiber optic sensors may face limitations in sensitivity or operational range.
  • Developing robust and sensitive temperature sensors for extreme conditions remains an active research area.

Purpose of the Study:

  • To develop a simple and highly sensitive fiber optic sensor for high-temperature measurement.
  • To investigate the performance of a novel multimode-single mode-multimode (MM-SM-MM) fiber configuration for temperature sensing.
  • To demonstrate stable and accurate temperature readings up to 900°C.

Main Methods:

  • Fabrication of a sensing head using a MM-SM-MM fiber configuration by splicing single-mode fiber (SMF) with multimode fibers (MMF).
  • Exploitation of mode-field mismatch and index matching at splicing points to couple light into SMF cladding modes.
  • Analysis of the transmission spectrum for interference patterns generated by core and cladding modes.
  • Observation of wavelength shifts in the interference pattern in response to temperature changes.

Main Results:

  • A stable interference pattern was observed in the transmission spectrum of the MM-SM-MM fiber sensor.
  • The interference pattern exhibited a red-shift (shift to longer wavelengths) with increasing temperature.
  • The sensor demonstrated stable temperature measurement capabilities up to 900°C.
  • A high sensitivity of 0.088 nm/°C was achieved.

Conclusions:

  • The proposed MM-SM-MM fiber sensor offers a simple yet effective method for high-temperature measurement.
  • The sensor's design leverages optical interference principles for sensitive temperature detection.
  • The demonstrated stability and sensitivity make this sensor suitable for demanding high-temperature applications.