Application Research Progress of Near Infrared Spectroscopy Technology in Field Inspection (1)

Near-infrared spectroscopy (Nearinirared spectroscopy, NIRS for short) analysis technology is a rapidly developed test technology in the late 1980s, and it has a wide range of applications in petrochemicals, agriculture, medicine, life sciences, environmental protection and other fields

1.

(1) Basic principles of near-infrared spectroscopy analysis technology

Near-infrared light is an electromagnetic wave between visible light (VIS) and mid-infrared light (MIR or IR)

(2) The analysis process of near-infrared spectroscopy technology

NIRS technology is a modern spectroscopy technology, which is a collection of modern electronic technology, spectral analysis technology, computer technology and chemometrics technology

(3) Characteristics of near-infrared spectroscopy technology

The reason why near-infrared spectroscopy technology can be applied in many fields in just over ten years, and then has such a rapid development in data processing and instrument manufacturing, is mainly because it has the following unique advantages in the analysis and determination of organic compounds Sex:

(1) The dispersion effect of light in the near-infrared region is large, and the penetration depth is large, so that the near-infrared spectroscopy technology can directly measure the sample with the diffuse reflection technology.

(2) On-line detection can be realized.

(3) In near-infrared spectroscopy analysis, only the spectral signal of the sample is obtained, and other reagents are not required.

(4) The wavelength in the near-infrared region is short and will not be absorbed by glass or quartz media.

(5) Many substances have small absorption coefficients in the near-infrared region, which makes the analysis process simple

(6) The analysis speed is fast, and it can be used to analyze the various properties of the sample or the simultaneous determination of multiple components

(7) It can be used for the qualitative analysis of samples, and can also obtain high-precision quantitative results

Disadvantages of near infrared spectroscopy:

(1) Since the measurement is frequency doubled and combined frequency absorption, the sensitivity is poor, and the content of detection is generally required to be greater than 0.

(2) Measuring the spectrum of samples without pretreatment is susceptible to the influence of the state of the sample and the measurement conditions, resulting in the fluctuation of the spectrum

(3) The spectral background is complex and the spectral peaks overlap, which must rely on algorithms and computer software and hardware technology

(4) Modeling needs to invest a certain amount of manpower, material and financial resources, and the model is only suitable for a certain range of sample testing

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