11. Infrared spectrometry in fuel analysis Flashcards
If increasing the wavelength (moving from left to right) energy is decreasing.
true
What is type of interaction with matter using IR spectroscopy?
molecule vibration
Define what is on IR spectra x and y
X axis wavenumber (cm-1)
Y-absorbance/transmitance
With IR spectroscopy we can determine bonds and functional groups?
true
what is FTIR?
Used to determine the FAME (fatty acid methyl esters) content in fuels.
It is a transmission measurement technique
What is radiation source in IR spectrometry?
In mid-infrared- a heated rod made of varbide/rare oxides or ceramic rod
In near infrared- tungsten light bulb (electric light that produces visible light by heating a tungsten filament to a high temperature)
Reflection measurements are suitable for samples that do not transmit IR radiation.
yes
IR light interaction: The fuel sample is exposed to IR light. Different chemical bonds (e.g., C–H, C=O) in the fuel absorb light at characteristic wavelengths.
true
Infrared (IR) spectrometry in fuel analysis works by measuring how a fuel sample absorbs infrared light at specific wavelengths, which correspond to the vibrational modes of molecular bonds.
true
IR spectroscopy is used in both: quantitative and qualitative analysis
true, concentration and chemical groups can be identified
What is Interferometer ?
Its a key component of FTIR.
It allows the simultaneous measurement of all wavelengths in the infrared spectrum, enabling fast, accurate, and detailed analysis of fuel composition and properties.