The main difference between IR (Infrared Spectroscopy) and FTIR (Fourier Transform Infrared Spectroscopy) lies in the method of data acquisition and the type of light used.
1. Data Acquisition:
- IR: Infrared Spectroscopy takes a single spectrum at a time. The instrument measures the intensity of the transmitted or absorbed light at different wavelengths.
- FTIR: Fourier Transform Infrared Spectroscopy uses an interferometer to collect a series of scans. It measures the interferogram, which is then mathematically transformed to obtain the spectrum.
2. Light Source:
- IR: Infrared Spectroscopy uses monochromatic light, typically emitted by a heated filament or a laser, which produces a narrow wavelength range.
- FTIR: Fourier Transform Infrared Spectroscopy uses polychromatic light, which covers a wide range of wavelengths. This is achieved by passing the light through an interferometer.
3. Scanning Speed and Resolution:
- IR: Infrared Spectroscopy typically scans at a slower rate and provides lower resolution due to the limitations of the instrument.
- FTIR: Fourier Transform Infrared Spectroscopy can scan up to 50 times per minute, providing faster data acquisition. It also offers better resolution and sensitivity.
In summary, FTIR is an improved version of IR spectroscopy that utilizes an interferometer and polychromatic light to achieve faster scanning, better resolution, and higher sensitivity in comparison to traditional IR spectroscopy.
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