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Fourier Transform Infrared

Fourier Transform Infrared

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Fourier Transform Infrared

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  1. Fourier Transform Infrared

  2. FTIR History Introduction Theory Technique Principle Working Working Diagram Actual Diagram Graph

  3. FTIR History infrared spectrophotometers were developed in the US in the mid 1940s. Initially, their applications were confined to R&D work on organic compounds, mainly in the petrochemical field. The first Japanese instruments were manufactured in 1954 by the Applied Optics Research Institute, the predecessor of JASCO.

  4. FTIR Introduction:A Fourier Transform InfraRed (FT-IR) Spectrometer is an instrument which acquires broadband Near InfraRed (NIR) to Far InfraRed (FIR) spectra.

  5. FTIR Theory of FTIR: FTIR spectrophotometry was developed in order to overcome the limitations encountered with dispersive instruments. The main difficulty was the slow scanning process. A method for measuring all the infrared frequencies simultaneously, rather than individually, was needed. A solution was developed which employed a very simple optical device called an interferometer. The interferometer produces unique type of signal which has all the infrared frequencies “ encoded” into it.

  6. Techniques of FTIR Following techniques of FTIR used by university researches scientists and process engineers Attenuated Total Reflectance (ATR) Specular Reflectance (SR) Reflection absorption (RA) Transmission (TR) Photoacoustic (PA)

  7. FTIR Principle Principle Of FTIR is that many gases absorb IR radiation at species-specific frequencies. FTIR spectroscopy is a disperse method, which means that measurements are performed over a broad spectrum instead of a narrow band of frequencies.The absorption corresponds specifically to the bonds present in the molecule. The frequency range are measured as wave numbers typically over range 400-600m-1.

  8. FTIR Working of FTIRThe FTIR uses interferometry to record information about a material placed in the IR beam. The Fourier Transform results in spectra that analysts can use to identify or quantify the material.

  9. FTIR Working diagram:

  10. FTIR Actual diagram

  11. FTIR Graph

  12. FTIR • Applications of FTIR • Quality verification of incoming/outgoing materials • Deformulation of polymers, rubbers, and other materials through thermogravimetric infra-red (TGA-IR) or gas chromatography infra-red (GC-IR) analysis • Microanalysis of small sections of materials to identify contaminants • Analysis of thin films and coatings • Monitoring of automotive or smokestack emissions • Failure analysis

  13. FTIR

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