1. Fourier transform infrared spectroscopy Berezin Danila Moscow 2013

2. Plan of a journey Terahertz radiation Its application And research FTIR spectroscopy

3. Terahertz radiation is an electromagnetic waves Terahertz gap 10 11 – 10 13 Hz

4. THz technology brings better sensing capabilities cancer cavity Visible imageTHz image

5. THz technology brings better sensing capabilities Visible imageTHz image ceramic knife

7. The goal is to measure how well a sample absorbs light samplelight

8. Scanning spectroscopy is the most straightforward way goal – spectrum of absorption

9. beam sourcesampledetector absorption It shines a monochromatic light beam…

10. beam sourcesampledetector absorption …and measures how much is absorbed

11. FT spectroscopy is a less intuitive way to obtain the same information goal – spectrum of absorption

12. beam sourcesampledetector absorption beam number A beam contains many frequencies of light at once and absorption of that beam is measured

13. beam sourcesampledetector absorption beam number Next, beam is modified to give a second data point

14. beam sourcesampledetector absorption beam number Process is repeated many times

15. Afterwards, computer processing is required

16. There are still undiscovered nuances How to generate and modify that special beam? What computer processing is required?

17. moving mirror Wave interference is a key to generate that special beam Michelson interferometer light source beam for the experiment

18. Processing required is Fourier transform raw datadesired result

19. FT spectroscopy has an advantage – Fellgett’s advantage Scanning spectroscopy Fourier transform spectroscopy

20. FTIR spectroscopy – Possible applications – Technology – Advantage

21. Thank you

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23. Fourier transform mirror 1 mirror 2 y 1 /2 x/2 Monochromatic source

24. Polychromatic source Fourier transform