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付里叶变换红外光谱仪的主要优点是光通量大,因而灵敏度高,而色散型分光光度计由于带有入射和出射狭缝,能够到达检测器上的辐射能量是非常有限的,而且随着分辩的提高而降低。例如当分辩为8cm~(-1)时,任一时刻到达检测器上的能量仅为0.2％左右,而当分辩提高到1cm~(-1)时,达到检测器上的能量仅为0.03％左右。另一个优点是波数准确度高,物理学家Connes首先将激光参比校准引入Micheson干涉仪,提高了波数的准确度。干涉仪动镜的位置是靠He—Ne激光器的激光干涉图准确测定的,因此光程差可测定得非常准
The main advantage of Fourier transform infrared spectroscopy is the large flux and therefore the high sensitivity, whereas the dispersive spectrophotometer has very limited radiation energy that can reach the detector due to the entrance and exit slits, Increase and decrease. For example, when the resolution is 8 cm -1, the energy reaching the detector is only about 0.2% at any time, and when the resolution is increased to 1 cm -1, the energy on the detector reaches only 0.03% about. Another advantage is the high wave number accuracy, physicist Connes first laser reference calibration into the Micheson interferometer, to improve the accuracy of the wave number. The position of the interferometer is determined by the laser interferogram of the He-Ne laser, so the optical path difference can be measured very accurately