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Related Concept Videos

Equipments Used to Measure Body Temperature01:13

Equipments Used to Measure Body Temperature

1.0K
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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Flame Photometry: Overview01:02

Flame Photometry: Overview

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Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
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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...
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Constant Pressure Calorimetry03:02

Constant Pressure Calorimetry

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Calorimetry is a technique used to measure the amount of heat involved in a chemical or physical process or to measure the heat transferred to or from a substance. The heat is exchanged with a calibrated and insulated device called the calorimeter. Calorimetry experiments are based on the assumption that there is no heat exchange between the insulated calorimeter and the external environment. The well-insulated calorimeters prevent the transfer of heat between the calorimeter and its external...
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Atomic Spectroscopy: Effects of Temperature01:27

Atomic Spectroscopy: Effects of Temperature

343
Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature...
343

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Related Experiment Video

Updated: Jul 12, 2025

High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings
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New temperature measurement method based on light-induced thermoelastic spectroscopy.

Xiaonan Liu, Yufei Ma

    Optics Letters
    |November 1, 2023
    PubMed
    Summary

    A novel temperature measurement technique, light-induced thermoelastic spectroscopy (LITES), utilizes a quartz tuning fork

    Area of Science:

    • Spectroscopy
    • Sensor Technology
    • Physical Chemistry

    Background:

    • Accurate temperature measurement is crucial in various industrial and scientific applications.
    • Existing methods like Tunable Diode Laser Absorption Spectroscopy (TDLAS) have limitations in cost and wavelength flexibility.
    • Developing novel, cost-effective, and versatile temperature sensing techniques is essential.

    Purpose of the Study:

    • To demonstrate a new temperature measurement method based on light-induced thermoelastic spectroscopy (LITES).
    • To investigate the feasibility and performance of LITES using a quartz tuning fork (QTF) as the detection element.
    • To evaluate the accuracy and potential advantages of the LITES technique for high-temperature measurements.

    Main Methods:

    • Utilized the thermoelastic effect of a high-quality factor quartz tuning fork (QTF) for temperature retrieval.

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  • Employed wavelength modulation spectroscopy (WMS) combined with the dual-line method for temperature measurement.
  • Selected two water vapor (H2O) absorption lines and a single distributed feedback (DFB) diode laser for simultaneous detection.

    • Main Results:

    • Successfully demonstrated the LITES method for temperature measurement in the range of 400°C to 1000°C.
    • Achieved a relative error of less than 5% in temperature measurements, indicating high detection accuracy.
    • The LITES sensor showed excellent noise suppression and signal improvement due to the QTF's properties.

    Conclusions:

    • The LITES technique offers a promising new approach for accurate temperature measurement.
    • This method is cost-effective, has no wavelength limitations, and is more versatile than TDLAS.
    • LITES is expected to find broader applications in various temperature sensing scenarios.