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Features of infrared absorption analyzer

Release time: 2019-12-31 11:07:06 Click: 1958

L 为定值时,如能测得纭和即可换算出混合气体中被测物质的浓度。 It can be known from Lambert- Beer's law that when a certain wavelength and absorption cell length L are selected as fixed values, the concentration of the substance to be measured in the mixed gas can be converted if the sum can be measured. This is the basic principle of the legal content of infrared absorption. However, due to the difficulty of measurement, the infrared gas analyzers we currently use all come from the dual optical path system to obtain the gas concentration by a comparative method.

红外吸收分析仪的特点

Features of infrared absorption analyzer

Lambert. Bier's law has a wide range of applications, not only in the infrared band, but also in the ultraviolet and visible bands. It has the following characteristics in the infrared band:

红外吸收是有条件的。 1. Infrared absorption is conditional. According to molecular theory and a large number of experiments, molecules are constantly moving, and vibrations are constantly occurring inside the molecules. Only the vibrations that change the dipole distance can absorb infrared spectra. 02 、)等,它们在振动过程中无偶,极距度化,因而不吸收红外光用红外法测定碳硫的体系中,虽有足量的氧气存在,由于不吸收红外线所以不干扰测定。 Monoatomic molecules (e.g., homonuclear diatomic molecules (e.g., 02 ,), etc., which have no couple during vibration and are polarized, so they do not absorb infrared light. In the system of measuring carbon and sulfur by infrared method, although there are A sufficient amount of oxygen exists and does not interfere with the measurement because it does not absorb infrared light.

红外吸收是有选择性的。 2. Infrared absorption is selective. Multi-atomic gas molecules, when irradiated by infrared rays, will accelerate vibration and rotation. Different substances have their own specific vibration or rotation rate. However, only when the rate of infrared light is consistent with the specific rate of the molecule itself can this molecule absorb the radiant energy of the infrared spectrum. C02 SO, 气体,在特定的波长( c 4 26 50 74 )有最大吸收的条件下测定的。 Therefore, it is selective, and the infrared method for measuring carbon and sulfur is to oxidize the sample at high temperature to convert carbon and sulfur into polyatomic CO 2 and SO. The gas has the maximum at a specific wavelength ( c is 4 , 26 , and 50 is 74 ). Measured under conditions of absorption.

3 )红外吸收的能量较大,这样大量的热能经过转换后,可用检器进行检测,从而确定待分析组分的浓度。 ( 3 ) The energy absorbed by infrared is large, so after a large amount of thermal energy is converted, it can be detected by a detector to determine the concentration of the component to be analyzed.

下一篇: 三种常用x荧光光谱仪探测器对比 Previous: Three important components of the spectrometer Next: Comparison of three commonly used x fluorescence spectrometer detectors

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