Method and system for non-destructive and rapid detection of fruit maturity by time-of-flight spectroscopy

Abstract

The invention discloses a time-of-flight spectrum fruit maturity non-destructive rapid detection method and system. The detection method includes the following steps: first, a laser driver drives a laser to generate a laser pulse signal, and the laser pulse signal acts on the surface of the fruit, and penetrates the fruit skin and the fruit The particles inside collide and scatter, and the scattered light beam is reflected from the surface of the fruit; then the high-speed response photodetector detects the pulse signal reflected from the fruit, and the above pulse signal enters the microcontroller after being amplified and converted by A / D. After processing by the microcontroller, the processed pulse signal is displayed on the oscilloscope, and finally the scattering coefficient of the fruit is evaluated according to the shape of the expanded pulse signal; the quality and maturity of the fruit are judged by the relationship between the scattering coefficient and the ripeness of the fruit. The method of the invention can accurately and rapidly detect the quality and maturity of the fruit without damage.

Description

technical field [0001] The invention relates to the field of optical diffuse reflection of plant tissue, in particular to a method and system for non-destructive and rapid detection of fruit ripeness by time-of-flight spectroscopy. Background technique [0002] As an important agricultural product, fruit is the main daily consumption food of people, and its quality is closely related to people's life. With the internationalization of the market and the improvement of people's living standards, consumers have higher and higher requirements for fruit quality. The ripeness of the fruit directly affects the quality of the fruit, such as flavor, firmness, and skin color. Fruits that are not fully ripe or overripe are not favored by consumers after they go on the market, thus affecting the market circulation to a certain extent, and even causing Economic losses to fruit traders and fruit growers. In addition, the ripeness of fruit also affects multiple links such as fruit pickin...

AI Technical Summary

Problems solved by technology

Although the process of judging fruit maturity through sugar content detection and the hardness tester used to judge fruit maturity can judge the maturity more accurately, however, these methods all need to destroy the skin surface tissue of the fruit and even the fruit during the detection process. Therefore, it is impossible to test one by one on a large scale, and it is difficult to apply to the production of modern fruit.

In addition, gas chromatography and gas chromatography-mass spectrometry are generally used for the detection of fruit aroma and aromatic substances. However, the odor components used in these detection methods are all products of separated samples, and the products need to be recombined for comparison. Therefore, the detection process is cumbersome and complicated, the cycle is long, and the cost is expensive

[0006] According to the search of existing patents, the current method of fruit maturity detection, such as the fruit maturity detection system based on infrared gas sensor (compare patent 20131054452.8), which includes fruit gas collection device and gas detection device, this method is complicated to operate, due to The concentration of ethylene gas produced by fruit ripening is low, which is likely to cause a large detection error; there is also the use of the change law of fruit soluble solids content to detect the maturity of fruit (compared with patent 20141005435.9), the detection efficiency of this method is low; five points Near-infrared fruit maturity set quality detector (compared with patent 201410059370.2), the device is complicated, the detection is cumbersome, and the work efficiency is reduced

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