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FTIR eller Fouriertransformation infrarødspektroskopi er måling teknik hvorved spectra er indsamlet baseret på svar fra en impuls af elektromagnetisk stråling. Det kan anvendes til forskellige typer af spektroskopi herunder infrarød spektroskopi, Kernemagnetisk resonans og elektron spin resonans-spektroskopi. Fourier transform spektroskopi er mere følsomme og har en meget kortere Prøvetagningstiden end konventionelle spektroskopiske teknikker.

SÃ¥dan fungerer det

I en konventionel spektrometer, en prøve er udsat for elektromagnetisk stråling og svaret er overvåget. Energi af stråling er varieret over det ønskede område og svaret er afbildet som en funktion af stråling energi. På visse resonansfrekvenserne karakteristisk for den bestemte prøve, vil blive absorberet stråling, hvilket resulterer i en serie af bjergtoppe i det spektrum, som derefter kan bruges til at identificere prøven.

I stedet for varierende energi af den elektromagnetiske stråling, Fourier Transform infrarødspektroskopi udsætter prøven til en enkelt puls af stråling og måler svaret. Den resulterende signal kaldet gratis induktion henfald indeholder en hastigt rådnende sammensat af alle mulige frekvenser. På grund af resonans af prøven, resonansfrekvenserne bliver dominerende i signalet og ved at udføre en matematisk operation kaldet en Fourier Transform på signalet, frekvensrespons kan beregnes. På denne måde, kan Fourier Transform spektrometer producere den samme slags spektrum som en konventionel spektrometer, men i en meget kortere tid.

Principperne for Fourier Transform tilgangen kan sammenlignes med en musikalsk stemmegaffel adfærd. Hvis en stemmegaffel er udsat for lydbølger af forskellige frekvenser, vil det vibrerer nÃ¥r lydbølge frekvenser er i ‘melodi’. Dette er lignende til konventionelle spektroskopiske teknikker, hvor strÃ¥ling frekvens er varieret og disse frekvenser, hvor prøven er i “tune” med strÃ¥ling opdaget. Svar fra et udsnit, der er udsat for en puls af strÃ¥ling er et signal om bestÃ¥ende primært af de karakteristiske frekvenser for at prøve. Fourier Transform er en matematisk teknik til bestemmelse af disse karakteristiske frekvenser fra en enkelt sammensat signal.

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