Portable fruit quality nondestructive testing device based on LED combined light source

Abstract

The invention provides a portable fruit quality nondestructive testing device based on an LED combined light source, comprising a hardware unit and a software system, wherein the hardware unit comprises a lighting module, a spectrum acquisition module and a spectrum processing module; the software system comprises softwares with functions of reading, storing, displaying, parameter setting and forecasting for spectrum by spectrum acquisition and spectrum analysis; the lighting module comprises a handheld probe interface (1), optical fibres (2), a switch (7), a handheld probe (8), the LED combined light source, and a constant flow source; the spectrum acquisition module comprises an optical fibre spectrograph (29) and USB wires; and the spectrum processing module comprises a support (3), a host machine (4), a display screen (6), a mainboard, data wires, a data storage, power cords, a power supply and USB wires. The invention can be applied to on-site fast nondestructive testing for internal quality of the fruit, such as sugar degree, acidness and vitamin C.

Description

technical field [0001] The invention relates to a portable non-destructive detection device for internal quality of fruit based on LED combined light source, which belongs to the technical field of non-destructive detection of agricultural and forestry products. Background technique [0002] With the continuous improvement of people's living standards, consumers pay more and more attention to the internal quality of fruits such as sugar content, acidity and vitamin C when purchasing fruits. At present, destructive chemical analysis is still the main method of fruit internal quality detection, such as detection of sugar content by anthrone colorimetry or sugar content meter, detection of acidity by potentiometric method, detection of vitamin C by colorimetry and high performance liquid chromatography, etc. , these methods require professionals to prepare samples, and have the disadvantages of cumbersome sample preparation, long detection time and high detection cost. Aiming ...

AI Technical Summary

Problems solved by technology

[0003] Combined with near-infrared spectroscopy technology, Germany, Israel, New Zealand and other countries have conducted basic theoretical research on the sugar content, defects, and maturity of fruits, and developed corresponding portable detection equipment, but there are weak detection signals and low detection accuracy. , poor adaptability and few practical applications

[0004] Japanese Patent No.09-089767 uses a spectroscopic system to divide the reflected light of fruits into monochromatic light of different wavelengths, and uses the absorbance at 912nm and 888nm after secondary differential processing to predict the sugar content inside the fruit, which can be used for on-site detection of fruit quality in orchards , but the spectroscopic accuracy is easily affected by factors such as external vibration and temperature, and the detection accuracy is not high

Japanese Patent No. 02808798.4 uses a linear continuous variable interference filter and a linear silicon array sensor to form a small beam splitter instead of a diffraction grating. The structure is more compact, but with this structure, the spectroscopic accuracy is still susceptible to external vibration, temperature and influence. Detection accuracy is not high

[0005] The Chinese patents with announcement number 100335886 and announcement number 100335887 both use a grating monochromator as a spectroscopic device. Similar to the aforementioned patents, the spectroscopic accuracy is still easily affected by external vibration and temperature, and the detection accuracy is not high.

The Chinese patents with announcement number 201000430 and announcement number 100483109 both use tungsten-halogen lamps as the light source, without a dedicated stabilized voltage supply circuit, and are affected by factors such as voltage fluctuations and light source aging, and the detection accuracy is difficult to guarantee

The Chinese patent with the announcement number 1284967 adopts a closed transmission method. Although a temperature sensor is installed on the side of the photoelectric sensor and the light source, and temperature compensation is considered in the detection model, there is still a problem of heat dissipation, and the detection accuracy is low and affects the detection accuracy of fruit quality.

[0006] The above-mentioned patents are all based on the single detection of the sugar content of the fruit or the internal defects of the fruit. At present, there is no portable non-destructive testing device for the internal quality of fruit that can quickly and non-destructively realize the sugar content, acidity and vitamin C.

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