When comparing IR (Infrared Spectroscopy) and FTIR (Fourier Transform Infrared Spectroscopy), the primary differences lie in how data is acquired and the type of light used.
What is the Difference Between FTIR and IR? (3 Key Points Explained)
1. Data Acquisition
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IR (Infrared Spectroscopy): This method captures a single spectrum at a time. The instrument measures the intensity of the light that is either transmitted or absorbed at various wavelengths.
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FTIR (Fourier Transform Infrared Spectroscopy): This method uses an interferometer to gather a series of scans. It measures an interferogram, which is then mathematically transformed to produce the spectrum.
2. Light Source
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IR (Infrared Spectroscopy): This method uses monochromatic light, usually generated by a heated filament or a laser, which emits a narrow range of wavelengths.
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FTIR (Fourier Transform Infrared Spectroscopy): This method employs polychromatic light, which covers a broad spectrum of wavelengths. This is achieved by directing the light through an interferometer.
3. Scanning Speed and Resolution
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IR (Infrared Spectroscopy): This method typically scans at a slower pace and offers lower resolution due to the limitations of the instrument.
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FTIR (Fourier Transform Infrared Spectroscopy): This method can scan up to 50 times per minute, enabling faster data acquisition. It also provides superior resolution and sensitivity.
In summary, FTIR is an advanced version of IR spectroscopy that leverages an interferometer and polychromatic light to achieve quicker scanning, enhanced resolution, and greater sensitivity compared to traditional IR spectroscopy.
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