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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,...
Thermometers and Temperature Scales01:22

Thermometers and Temperature Scales

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...
Assessing Body Temperature - Oral01:14

Assessing Body Temperature - Oral

Here are the steps to accurately measure oral temperature using an electronic thermometer:
Step 1:
Start by practicing proper hand hygiene to prevent the spread of microorganisms.
Step 2:
Take the thermometer out of the charging unit, switch it on, and wait for the ready sign.
Step 3:
Gently slide the probe cover until a click is heard. This simple action prevents cross-contamination and ensures the correct placement of the probe cover.
Step 4:
Instruct the patient to open their mouth and place...
Assessing Body Temperature - Tympanic membrane01:14

Assessing Body Temperature - Tympanic membrane

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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Related Experiment Video

Updated: May 15, 2026

Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
10:28

Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization

Published on: July 5, 2016

General temperature field measurement by digital holography.

Roman Doleček1, Pavel Psota, Vít Lédl

  • 1Department of Measurements, Technical University of Liberec, Studentska 2, Liberec 46117, Czech Republic.

Applied Optics
|January 8, 2013
PubMed
Summary

This study introduces a digital holographic technique for measuring periodic asymmetric temperature fields. The method uses a modified Twyman-Green interferometer and a single synchronized camera for precise 3D temperature mapping.

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

Published on: November 7, 2016

Area of Science:

  • Optical Metrology
  • Thermodynamics
  • 3D Imaging

Background:

  • Accurate measurement of dynamic temperature fields is crucial in various scientific and engineering disciplines.
  • Existing methods for temperature field measurement may lack precision or the ability to capture asymmetric and periodic phenomena.
  • Digital holography offers a non-contact, high-resolution approach for optical measurements.

Purpose of the Study:

  • To present a novel digital holographic method for the measurement of periodic asymmetric temperature fields.
  • To demonstrate a technique utilizing a modified Twyman-Green interferometer with double sensitivity.
  • To enable precise three-dimensional (3D) temperature field reconstruction from synchronized camera data.

Main Methods:

  • Implementation of a modified Twyman-Green interferometer setup.
  • Utilizing a single, precisely synchronized and triggered digital camera for data acquisition.
  • Applying a tomographic approach for the reconstruction of the 3D temperature field.
  • Leveraging the periodicity and self-similarity of the phenomenon for enhanced data capture.

Main Results:

  • Successful demonstration of a digital holographic method for periodic asymmetric temperature field measurement.
  • Achieved double sensitivity in the modified Twyman-Green setup.
  • Acquired data using a single synchronized digital camera for 3D reconstruction.
  • Reconstructed 3D temperature fields based on a tomographic approach.

Conclusions:

  • The presented digital holographic method is effective for measuring periodic asymmetric temperature fields.
  • The use of a modified Twyman-Green setup with a single synchronized camera simplifies data acquisition for 3D temperature mapping.
  • Tomographic reconstruction provides accurate 3D temperature field data, advancing optical metrology techniques.