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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
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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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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.
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In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
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When objects at different temperatures are placed in contact with each other but isolated from everything else, they attain thermal equilibrium. A container that prevents heat transfer in or out is called a calorimeter, and the use of a calorimeter to make measurements is called calorimetry. Generally, these measurements involve heat or specific heat capacity. The term "calorimetry problem" is used for any problem where the specified objects are thermally isolated from their...
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High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings
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Differential Infrared Pyrometry for Determination of Microkelvin Temperature Variations.

Wenyu Bai1, Ziyao Tang1, Shashank Gupta1

  • 1Department of Chemistry , Brown University , 324 Brook Street , Providence , Rhode Island 02912 , United States.

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This study introduces a novel differential infrared pyrometer capable of microkelvin temperature sensitivity. This noninvasive tool accurately monitors heat changes in chemical and biological reactions without causing disturbances.

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Area of Science:

  • Physical Chemistry
  • Biophysics
  • Chemical Instrumentation

Background:

  • Accurate temperature measurement is crucial for understanding chemical and biological reaction kinetics.
  • Conventional temperature probes can disrupt experiments by introducing external temperature changes.
  • Existing infrared pyrometry lacks the sensitivity for detecting subtle temperature variations in dynamic systems.

Purpose of the Study:

  • To develop a highly sensitive, noninvasive temperature measurement technique.
  • To overcome the limitations of conventional probes and current infrared pyrometry.
  • To enable the study of minuscule heat evolution in chemical and biological processes.

Main Methods:

  • Development of a differential infrared pyrometer utilizing spatial modulation.
  • Incorporation of a resonant oscillating mirror for enhanced sensitivity.
  • Application of the pyrometer to monitor heat changes in real-time.

Main Results:

  • Achieved microkelvin-level sensitivity to temperature variations.
  • Successfully monitored heat evolution during an acid-base reaction.
  • Quantified heat release from hydrogen peroxide decomposition catalyzed by bovine liver catalase.

Conclusions:

  • The developed differential infrared pyrometer offers unprecedented sensitivity for noninvasive temperature monitoring.
  • This technology can significantly advance the study of thermal dynamics in various chemical and biological systems.
  • The instrument provides a powerful tool for observing subtle heat changes without experimental interference.