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由于使用博里叶变换红外(FT-IR)光谱仪,红外光谱的探测极限得到了改善,达到从微克到亳微克和从ppm到ppb的水平。这是由于众所周知的FT-IR光谱仪的优点,即它的测量灵敏度和速度都比经典的色散系统仪器的高,但是,这个探测极限只是对长光程池子中气体的某些特殊种类的沾污物或是溶液中由色谱技术分离出来的某些成分才能达到。要获得小的固体样品的红外光谱仍然是非常困难的工作,特别是如果样品小到只有通过光学放大才能看得见的情况就更困难。专门的光束聚光器的发展甚至同时附有控制的光学系统,也还是不能解决这些问题,因为人们必须把样品放到测量焦点上和精确地分析感兴趣的区域。并且上述的取样附件只能实现的测量方式是透射,但多数的“实际样品”必须用不接触样品的反射方法来分析。
Due to the use of Fourier transform infrared (FT-IR) spectroscopy, the detection limit of the infrared spectrum has been improved, ranging from micrograms to nanograms and from ppm to ppb. This is due to the advantage of the well-known FT-IR spectrometer that its measurement sensitivity and speed are higher than those of a classical dispersion system instrument, but this detection limit is only a specific type of contamination of gases in long path cells Some of the ingredients that are separated by chromatographic techniques in solution or in solution can be achieved. Getting infrared spectra of small, solid samples is still a very difficult task, especially if the sample is so small that it can only be seen by optical amplification. The development of specialized beam concentrators, even with a controlled optical system, still does not solve these problems because one has to place the sample in the measurement focus and precisely analyze the area of interest. And the above sample attachment can only be measured by transmission, but most of the “actual samples” must be analyzed by non-contact reflection methods.