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Related Concept Videos

Equipments Used to Measure Body Temperature01:13

Equipments Used to Measure Body Temperature

1.1K
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,...
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Temperature Measurement Sites01:14

Temperature Measurement Sites

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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...
2.0K
Assessing Body Temperature - Temporal Artery01:19

Assessing Body Temperature - Temporal Artery

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Here is a stepwise guide to assessing the body temperature at the temporal artery using a temporal artery thermometer
Step 1: Perform hand hygiene and don a fresh pair of gloves to prevent cross-infection and ensure patient safety.
Step 2: Explain the procedure to the patient to establish trust. Clear communication establishes trust with the patient, ensures they understand what to expect, promotes cooperation, and enhances comfort during the procedure.  
Step 3: Assess the patient's...
629
Assessing Body Temperature - Tympanic membrane01:14

Assessing Body Temperature - Tympanic membrane

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Assessing tympanic membrane temperature involves using a tympanic membrane thermometer (TMT). Here is a step-by-step guide:
Step 1: Begin by practicing good hand hygiene to prevent the transmission of microorganisms.
Step 2: Turn on the thermometer and wait until the ready sign appears on the screen to ensure accurate measurement.
Step 3: Slide the probe cover in place to prevent cross-contamination.
Step 4: Instruct the patient to tilt their head to the side for comfort and check for cerumen...
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Thermometers and Temperature Scales01:22

Thermometers and Temperature Scales

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Any physical property that depends consistently and reproducibly on temperature can be used as the basis of a thermometer. For example, volume increases with temperature for most substances. This property is the basis for the common alcohol thermometer and the original mercury thermometers. Other properties used to measure temperature include electrical resistance, color, and the emission of infrared radiation.
As many physical properties depend on temperature, the variety of thermometers is...
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Temperature Dependent Deformation01:12

Temperature Dependent Deformation

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In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
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Related Experiment Video

Updated: Aug 16, 2025

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

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Fiber Temperature Sensor Based on Vernier Effect and Optical Time Stretching Method.

Weihao Lin1,2,3, Yuhui Liu3, Yibin Liu3

  • 1State Key Laboratory of Analog and Mixed-Signal VLSI, University of Macau, Macau 999078, China.

Micromachines
|December 23, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces a novel ultra-fast temperature sensor using cascaded Sagnac rings and optical time-stretching. It achieves nanosecond-level monitoring, significantly outperforming traditional methods.

Keywords:
Vernier effectcascading Saganc ringsoptical time-stretching effecttemperature sensing

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Area of Science:

  • Optoelectronics
  • Fiber Optic Sensing
  • Photonics

Background:

  • Traditional fiber optic sensors often have slow demodulation speeds, typically in the second level, limiting real-time monitoring applications.
  • Existing temperature sensing methods lack the sensitivity and speed required for advanced applications.

Purpose of the Study:

  • To develop an ultra-sensitive and ultra-fast temperature sensing system.
  • To overcome the limitations of traditional optical spectrum analyzer (OSA) demodulation speeds.
  • To enhance temperature sensing sensitivity and response speed using novel optical techniques.

Main Methods:

  • Cascading Sagnac rings to leverage the Vernier effect for enhanced sensitivity.
  • Employing dispersive fibers for optical time-stretching to map wavelength shifts to the time domain.
  • Utilizing polarization-maintaining fiber (PMF) in the Sagnac rings to maximize thermal-optical coefficient effects.

Main Results:

  • Achieved ultra-fast temperature monitoring at the nanosecond level.
  • Demonstrated a high sensitivity of -6.228 nm/°C with cascaded Sagnac rings, 8.5 times higher than single-ring systems.
  • Increased response sensitivity to 7.333 ns/°C via optical time stretching, a 7.4-fold magnification with a 50 MHz response speed.

Conclusions:

  • The novel system offers significant improvements in temperature sensing speed and sensitivity.
  • This method provides a breakthrough for real-time, high-resolution temperature monitoring.
  • The developed technique has potential applications in various fields requiring rapid thermal detection.