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高性能的博里叶变换红外光谱仪不仅能改善某些红外分析的方法,而且可以改善那些希望得到解决的红外分析的问题。测量低透射率样品要求有高信噪比和光度计的稳定性这些FT的优点,它将做为估价能给以解决的这类问题的方法来描述。一个典型的例子是用红外显微镜测定高聚物中嵌夹物的光谱。文中给出的光谱图是测量直径约为250μm圆状样品得到的光谱。该光谱是含嵌夹物区域和邻近的高聚物区域的光谱之差的结果。作为第二个例子将介绍测定印刷纸币用的油墨的类型。未印刷和印刷部位的光谱分别为图2的曲线A和B所示,纸币未印刷部位的最大透射率仅是0.4%。
High-performance Fourier transform infrared spectroscopy can not only improve some of the infrared analysis methods, but also can improve those who wish to solve the problem of infrared analysis. The measurement of low transmissivity samples requires the advantages of these FTs with high signal-to-noise ratio and photometric stability, which will be described as a method of evaluating such problems that can be addressed. A typical example is the determination of the spectrum of the insert in the polymer by means of an infrared microscope. The spectrograms given in this paper are obtained by measuring a circular sample with a diameter of about 250 μm. This spectrum is the result of the difference in spectra between the area containing the insert and the adjacent polymer. As a second example, a description will be given of the type of ink for measuring a printing banknote. The spectra of the unprinted and printed parts are shown in curves A and B of FIG. 2, respectively, and the maximum transmittance of the unprinted portion of the banknote is only 0.4%.