Fourier Transform Infrared Spectroscopy Test

Electric Electronic Tests

Fourier Transform Infrared Spectroscopy Test

Fourier Transform Infrared Spectroscopy (FTIR) is a standard technique used to identify contaminants on the surface of printed circuit boards (PCB) and around electronic components (BGA, capacitors, resistors, inductors, connectors, diodes, oscillators). In addition, FTIR can be used for "simpler" identities, such as determining the type of a specific plastic or rubber compound.

Fourier Transform Infrared Spectroscopy Test

Typical Uses

  • Pollution (Residue) Analysis
  • Plastic Identification
  • Rubber Pyrolysis Identification

Infrared spectra obtained through FTIR can help identify the chemical composition and / or bond found in an unknown molecule. The greatest use of infrared spectroscopy is that the instrument provides structural information about the presence of some functional groups present in a sample.

Methodology: The Fourier Transform Infrared Spectrometer collects and processes infrared wavelength absorption or transmissions to spectra. These spectra are created when a molecule converts infrared radiation into molecular vibrations. These vibrational movements create bands in a spectrum that occur at certain wavelengths (cm-1). Each wavelength is then dependent on a number of other issues that can be used to help determine which types of bonds are present in the test sample.

Returning to the analysis side of FTIR, the spectrometer has the ability to analyze samples in two different ways. These analysis methods are called "bench" and "micro-FTIR".

A "bench" analysis generally involves turning the sample to be analyzed into a thin film or pellet and then passing the infrared beam through the sample to obtain a spectrum. Typically, this type of analysis is performed on homogeneous samples.

A "micro-FTIR" analysis consists of using a microscope attachment on the spectrometer to analyze small areas of interest of 25 microns in diameter. This technique is particularly useful for the analysis of small surface contamination areas or evaporated rinsing solutions. In addition, “micro-FTIR” allows for on-site analysis of samples when required.

After obtaining an FTIR spectrum, the scan can be interpreted to provide information about the compound (s) present in the test sample. In most cases, the spectrum can be compared to the spectra of standard materials in an IR reference library or compared to customer provided references. In both cases, the spectrum gives significant information about the sample and sometimes even the relative amount available.

Overall, FTIR can be used as a highly effective tool for many analyzes. For contamination analysis, FTIR typically identifies the source of the observation contaminant, while for identification analysis; It can distinguish plastic types such as FTIR, PVC and PP and rubber types such as natural rubber and butyl rubber.

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