fourier transform infrared spectroscopy
DESCRIPTION
This is a background presentation for my speech about Fourier transform infrared spectroscopy.TRANSCRIPT
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Fourier transform infrared spectroscopy
Berezin Danila
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Plan of a journey
Terahertz radiation
Its application
And research
FTIR spectroscopy
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Terahertz radiation is an electromagnetic waves
Terahertz gap1011 – 1013 Hz
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THz technology brings better sensing capabilities
cancer
cavity
Visible image THz image
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THz technology brings better sensing capabilities
Visible image THz image
ceramicknife
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The goal is to measure how well a sample absorbs light
sample light
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Scanning spectroscopy is the most straightforward way
goal – spectrumof absorption
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beam source sample detector
abso
rptio
n
It shines a monochromatic light beam…
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beam source sample detector
abso
rptio
n
…and measures how much is absorbed
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FT spectroscopy is a less intuitive way to obtain the same information
goal – spectrumof absorption
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beam source sample detector
abso
rptio
n
beam number
A beam contains many frequencies of light atonce and absorption of that beam is measured
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beam source sample detector
abso
rptio
n
beam number
Next, beam is modified to give a second data point
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beam source sample detector
abso
rptio
n
beam number
Process is repeated many times
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Afterwards, computer processing is required
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There are still undiscovered nuances
How to generate and modify that special beam?
What computer processing is required?
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moving mirror
Wave interference is a key to generate that special beam
Michelson interferometer
light source
beam for theexperiment
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Processing required is Fourier transform
raw data desired result
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FT spectroscopy has an advantage – Fellgett’s advantage
Scanningspectroscopy
Fourier transformspectroscopy
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FTIR spectroscopy
– Possible applications– Technology– Advantage
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Thank you
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Back up
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Fourier transformmirror 1
mirror 2
y1/2x/2
Monochromatic source
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Polychromatic source
Fourier transform
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Fourier transform