Скачать или смотреть What Is The Difference Between IR And FTIR Spectroscopy?

What Is The Difference Between IR And FTIR Spectroscopy? -- IR spectroscopy is a broad analytical technique that measures the absorption of infrared radiation by a sample, providing information about its molecular vibrations and functional groups. FTIR (Fourier Transform Infrared) spectroscopy is a specific and highly advanced type of IR spectroscopy. The primary difference lies in how the IR spectrum is acquired. Traditional dispersive IR instruments use a monochromator to scan through wavelengths sequentially, measuring absorbance at each point. In contrast, FTIR utilizes an interferometer to simultaneously collect data from all IR frequencies. The interferometer generates an interferogram, which is a complex signal representing the sum of all IR wavelengths. This interferogram is then mathematically converted into a conventional IR spectrum (absorbance versus wavenumber) using a Fourier transform algorithm. This approach makes FTIR significantly faster, more sensitive, offers a higher signal-to-noise ratio, better wavelength accuracy, and is less susceptible to stray light compared to dispersive IR, making it the dominant IR technique in modern laboratories.


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