New method for online detecting crude tobacco chemical components through AOTF near-infrared spectroscopy

Abstract

The invention discloses a new method for online detecting crude tobacco chemical components through an AOTF near-infrared spectroscopy, and mainly relates to the technical field of the analytical chemical instrument. The method comprises the following steps: step one, mounting an online window module on an outer frame of a conveyor belt; step two, enabling crude tobacco samples to fall to the window module from the conveyor belt, and sliding to a subsequent conveyor belt through a quartz window; step three, fixing the AOTF near-infrared spectroscopy behind the window module so that a lens of the AOTF near-infrared spectroscopy is aimed at a center of circle of the quartz window and the optical distance remains stationary; and step four, when online work is carried out, all crude tobacco samples pass through the window module, wherein the AOTF near-infrared spectroscope collects the data of the crude tobacco samples through the quartz window. By detecting multi-group of data, the obtained near-infrared spectrum information is more comprehensive, the effective information is more plentiful, and the spectral analysis difficulty is reduced.

Description

technical field [0001] The invention mainly relates to the technical field of analytical chemical instruments, in particular to a new method for online detection of chemical components of raw tobacco by an AOTF near-infrared spectrometer. Background technique [0002] Modern infrared spectroscopy (NIR) analysis technology is a high-tech science and technology that has developed rapidly in the field of analytical chemistry in recent years. Near-infrared light refers to electromagnetic waves with a light wave range of 780-2526mm. Generally, the near-infrared spectrum absorption of organic substances in this area is mainly hydrogen-containing Group (OH, CH, NH, SH, PH) double frequency and combined frequency absorption, almost all the main structures and compositions of organic substances can find signals in their near-infrared spectrum, and the spectrum is stable. Moreover, it is easy to operate, rapid in analysis, and reflects the state of the measured object in real time; it...

AI Technical Summary

Problems solved by technology

However, when used for the detection of raw tobacco, due to the complex physical state of the raw tobacco, especially at the position after the cut on the conveyor belt, the tobacco leaves and tobacco stems are mixed together, and the height changes are relatively large. For spectroscopic instruments that require optical path Said, it is very difficult to detect

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