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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,...
Gas Thermometers and the Kelvin Scale01:22

Gas Thermometers and the Kelvin Scale

The definition of temperature in terms of molecular motion suggests that there should be a lowest possible temperature, where the average kinetic energy of molecules is zero (or the minimum allowed by quantum mechanics). Experiments confirm the existence of such a temperature, called absolute zero. An absolute temperature scale is one whose zero point is absolute zero. Such scales are convenient in science because several physical quantities, such as the volume of an ideal gas, are directly...

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Related Experiment Video

Updated: Jun 14, 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

Optical temperature sensor for high voltage applications.

A J Rogers1

  • 1Central Electricity Research Laboratories, Kelvin Avenue, Leatherhead, Surrey KT22 7SE, UK.

Applied Optics
|April 8, 2010
PubMed
Summary
This summary is machine-generated.

A new optical temperature sensor uses crystalline quartz for accurate measurements in high voltage areas. This passive sensor is unaffected by electromagnetic fields and suitable for harsh environments like transformer oil.

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Area of Science:

  • Materials Science
  • Optical Physics
  • Sensor Technology

Background:

  • High voltage environments require specialized sensors resistant to electromagnetic interference.
  • Existing temperature sensors may face limitations in accuracy or durability in such conditions.

Purpose of the Study:

  • To develop and test an all-dielectric, electrically passive optical temperature sensor for high voltage applications.
  • To evaluate the sensor's performance, accuracy, and compatibility with harsh environments.

Main Methods:

  • Constructed an optical temperature sensor based on the temperature dependence of optical activity in crystalline quartz.
  • Tested the sensor's linearity, accuracy, and response in a temperature range of 20-180 degrees C.
  • Assessed the sensor's immunity to external magnetic and electric fields.

Main Results:

  • The sensor demonstrated excellent linearity between 20 and 180 degrees C.
  • Temperature measurements were accurate to within +/-2 degrees C.
  • The sensor's output was unaffected by external electromagnetic fields.

Conclusions:

  • The developed optical sensor is a viable solution for accurate temperature monitoring in high voltage environments.
  • The sensor's materials exhibit expected long-term chemical compatibility with transformer insulating oil up to 180 degrees C.
  • The sensor offers a robust, passive, and field-immune temperature measurement technology.