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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

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...
Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

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.
Different compounds display unique properties due to their...
IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the C=O, C=N, and C=C occur between 1600–1850 cm−1.
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Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.

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A Multimodal Wide-Field Fourier-Transform Raman Microscope
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Infrared focal plane array with a built-in stationary Fourier-transform spectrometer: basic concepts.

Sylvain Rommeluère1, Nicolas Guérineau, Riad Haidar

  • 1Office National d'Etudes et de Recherches Aérospatiales, Palaiseau F-91761, France.

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A new Fourier transform infrared (FTIR) spectrometer integrates the interferometer directly into the focal plane array (FPA) during fabrication. This novel configuration demonstrates the spectrometric function using an HgCdTe photodetector.

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Area of Science:

  • Optics and Photonics
  • Spectroscopy
  • Materials Science

Background:

  • Traditional Fourier transform infrared (FTIR) spectrometers utilize separate interferometer and detector components.
  • Integrating components can lead to more compact and efficient spectroscopic systems.

Purpose of the Study:

  • To present a novel FTIR spectrometer configuration with an integrated interferometer within the focal plane array (FPA).
  • To demonstrate the feasibility and performance of this integrated design.

Main Methods:

  • Fabrication of an FTIR spectrometer with the interferometer directly integrated into the FPA.
  • Utilizing a mercury cadmium telluride (HgCdTe) photodetector for spectrometric function demonstration.
  • Characterization of the integrated FTIR-FPA using parameters like optical path difference and spectrometric efficiency.

Main Results:

  • Successful demonstration of the spectrometric function in a novel FTIR-FPA configuration.
  • The developed FTIR-FPA can be characterized by intrinsic parameters.
  • Initial experimental results validate the performance of the integrated system.

Conclusions:

  • The direct integration of an interferometer into an FPA represents a significant advancement in FTIR spectrometer design.
  • This novel approach offers potential for miniaturized and high-performance spectroscopic instruments.
  • Further research and development are warranted to explore the full capabilities of this technology.