傅里叶转换红外光谱 (FTIR)是一种用来获得吸收,射出,光电导性或固体, 液体或气体的拉曼散射的红外光光谱技术。傅里叶转换红外光谱仪同时收集一个大范围范围内的光谱数据。这给予了在小范围波长内测量强度的色散光谱仪一个显著的优势。FTIR已经能够做出色散型红外光谱，但使用的并不普遍(除了有时候在近红外)，开启了红外光谱新的应用。傅里叶转换红外光谱仪是源自于傅里叶转换(一种数学过程)，需要将原始数据转换成实际的光谱。对于这种技术的其他运用，请参阅傅里叶转换红外光谱。

Fourier transform infrared spectroscopy (FTIR) is a technique which is used to obtain an infrared spectrum of absorption or emission of a solid, liquid or gas. An FTIR spectrometer simultaneously collects high spectral resolution data over a wide spectral range. This confers a significant advantage over a dispersive spectrometer which measures intensity over a narrow range of wavelengths at a time.