Non-destructive testing system and method for testing internal quality of fruit by using near-infrared spectra

Abstract

The invention provides a non-destructive testing system for testing the internal quality of a fruit by using near-infrared spectra. The non-destructive testing system comprises a collector and a microcomputer, wherein the collector comprises a collecting probe (3) and an optical fiber probe (6) which penetrates through the interior of the collector; an elastic light-shading pad (11) and a correcting wheel (1) are arranged on the collecting probe (3); the correcting wheel (1) is connected with a step motor (2); and the step motor (2) is connected with the microcomputer (22). A whiteboard and a blackboard which can be automatically switched and a through hole are designed inside a light path of the collecting probe to automatically collect the total reflection reference spectrum, a dark spectrum and a sample spectrum and automatically calibrate the spectra, so that noise influence on a detector is reduced; the elastic light-shading pad is arranged at the front part of the collecting probe to prevent interference of ambient light to the near-infrared spectra; and an automatic collecting switch is triggered by a force generated during contact of the elastic light-shading pad and a tested object, thus achieving automatic collection of the spectra.

Description

technical field [0001] The invention relates to the technical field of near-infrared spectroscopy, in particular to a system and method for detecting the internal quality of fruits by near-infrared spectroscopy. Background technique [0002] With the improvement of living standards, consumers have higher and higher requirements for fruit quality. They not only pay attention to the external quality of fruit, but also pay great attention to internal quality such as sugar content and acidity. Destructive detection methods are usually used for the internal quality detection of fruits, and the detection workload is heavy. Each index needs to be detected by different methods, and it is impossible to achieve rapid and non-destructive detection of samples. The use of near-infrared spectroscopy technology can quickly and non-destructively detect the internal quality of fruits such as sugar content, acidity and maturity, and is an efficient detection method. In recent years, the rese...

AI Technical Summary

Problems solved by technology

[0005] In the prior art, there is a hand-held near-infrared probe used for non-destructive testing of the internal quality of fruits. The optical fiber probe consists of four LED light sources with different wavelengths, a detection optical fiber, an automatic sampling control system, a light source stabilization circuit, a digital temperature and humidity sensor, and a circular sensor. Shaped boss, shading ring, soft rubber ring, switch, circuit box and shell, it can be used for fruit online monitoring and on-site sampling, but it cannot realize the function of automatic spectral calibration

Images