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Related Concept Videos

Spectrophotometry: Introduction01:16

Spectrophotometry: Introduction

Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
The essential components of a spectrophotometer include a source of electromagnetic radiation, a slot for placing a material to be analyzed, and a...
UV–Vis Spectrometers01:14

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...
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,...
UV–Vis Spectroscopy: Beer–Lambert Law01:09

UV–Vis Spectroscopy: Beer–Lambert Law

The Beer-Lambert law describes the relationship between absorbance and concentration, which combines the principles established by scientists Johann Heinrich Lambert and August Beer. Lambert's law states that when light passes through a medium, the loss in intensity is directly proportional to the original intensity and the path length of the light. Beer's law proposed that the transmittance of a solution remains constant if the product of concentration and path length is constant. The modern...
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...
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...

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Updated: Jun 17, 2026

Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere
08:52

Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere

Published on: April 30, 2018

[Study on temperature measurement of solution by reference-wavelength method].

Yun Chen1, Yu-Jie Liang, Wen-Liang Chen

  • 1State Key Lab of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China. chenyun_lwg@yahoo.com.cn

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|December 30, 2009
PubMed
Summary
This summary is machine-generated.

This study introduces a novel reference-wavelength method to accurately measure solution temperature using near-infrared (NIR) spectroscopy. This technique overcomes temperature fluctuations, improving precision in various industrial applications.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy

Context:

  • Near-infrared (NIR) spectroscopy is crucial in agriculture, medicine, and industry.
  • Temperature fluctuations significantly impact NIR measurement precision, posing a challenge for accurate analysis.
  • Existing methods struggle to effectively control or compensate for temperature variations.

Purpose:

  • To develop a robust method for precise temperature measurement in solutions using NIR spectroscopy.
  • To address the challenge of temperature instability in NIR analytical measurements.
  • To introduce a reference-wavelength approach for accurate temperature determination.

Summary:

  • A novel reference-wavelength method is presented for solution temperature measurement based on the displacement effect between solvent and solute molecules.
  • The method utilizes the absorbency difference at a reference wavelength, which is insensitive to solute concentration but highly sensitive to temperature changes.
  • Experimental validation with glucose aqueous solutions demonstrated high accuracy, with an average temperature calculation error of 0.03°C.

Impact:

  • Enables more reliable and precise NIR spectroscopic measurements across various industries by compensating for temperature variations.
  • Provides a cost-effective and accurate method for real-time temperature monitoring in chemical and biological solutions.
  • Enhances the applicability and accuracy of NIR spectroscopy in quality control and process monitoring.