Sorting device with aflatoxin detection function and sorting method

Abstract

The invention discloses a sorting device with an aflatoxin detection function. The sorting device comprises a material slideway, wherein a visible light LED and an ultraviolet LED are arranged on two sides of the tail end of the material slideway, the visible light LED and the ultraviolet LED alternately illuminate in a time-sharing manner, light splitting devices are arranged on two sides of the visible light LED and the ultraviolet LED, visible light gray-scale line-scan cameras are arranged on two sides and above the light splitting devices, and the two visible light gray-scale line-scan cameras on the same side form a visible light gray-scale line-scan camera group. According to the invention, through a modulation mode, a visible light LED and an ultraviolet LED alternately illuminate in a time-sharing manner to obtain a visible light image and a fluorescence image which do not interfere with each other; a fluorescence signal collection light path is the same light path in front of a light splitting device, so that two fluorescence images for detecting aflatoxin always come from the same position of the material, and the degree of the material polluted by the aflatoxin is accurately reflected; and in the sorting decision making process, color information, shape information and aflatoxin detection information of the materials are integrated, and the material sorting precision and efficiency are improved.

Description

technical field [0001] The invention relates to the field of sorting devices, in particular to a sorting device and a sorting method with aflatoxin detection function. Background technique [0002] Aflatoxin is a heterocyclic compound produced by Aspergillus flavus and Aspergillus parasiticus. Its toxicity is much higher than that of cyanide, arsenic and organic pesticides, and it has a strong carcinogenic effect. Aflatoxin is easy to contaminate grain and oil and other agricultural products, food and feed, and directly or indirectly enters the human food chain. It is one of the major issues affecting the quality of agricultural products and food safety, and has attracted great attention from all over the world. [0003] The detection of aflatoxin can be realized by using ultraviolet-induced fluorescence method. Materials contaminated by aflatoxin can produce yellow-green fluorescence (BGYF) under the irradiation of 365nm ultraviolet light. When different materials are infec...

AI Technical Summary

Problems solved by technology

Due to the use of visible LEDs and UV LEDs for simultaneous illumination, the camera cannot distinguish between visible LED lighting signals and fluorescent signals when collecting fluorescent signals, which affects the detection of aflatoxin

When using the normalized difference fluorescence index to detect aflatoxins, it is necessary to obtain the grayscale signal output by the camera after passing through two wavelength filters at the same position on the material. The fluorescent signal at the same position is reflected. The success of this detection method is related to the spatial position of the falling material. During the implementation process, two independent receiving optical paths cannot ensure that the acquired fluorescent images of two wavelengths always originate from the material. The same position, which has an impact on judging whether it is a material contaminated by aflatoxin

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