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Fruit ripeness nondestructive testing system and method based on infrared photoacoustic spectrum

A non-destructive testing, infrared photoacoustic technology, applied in color/spectral property measurement, measuring device, material analysis by optical means, etc., can solve the problem of limited useful information of light, limited depth of light penetration, and difficult to obtain accurate and reliable detection methods. In order to improve the detection accuracy and good repeatability

Active Publication Date: 2017-01-04
HENAN AGRICULTURAL UNIVERSITY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] Although near-infrared spectroscopy technology has related applications in fruit ripening detection technology, due to the interaction between light and tissue must be accompanied by certain reflection, scattering and other light loss, the penetration depth of light in tissue is limited. , so that the useful information carried by the detected light is also limited. At present, these technical problems have not been solved, so it is difficult for this kind of detection method to obtain accurate and reliable detection results.

Method used

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  • Fruit ripeness nondestructive testing system and method based on infrared photoacoustic spectrum
  • Fruit ripeness nondestructive testing system and method based on infrared photoacoustic spectrum

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Embodiment 1

[0028] Embodiment 1: a kind of fruit ripeness nondestructive detection system based on infrared laser photoacoustic spectroscopy, such as figure 1 As shown, it includes a laser emitting component, a photoacoustic detection component and a signal processing component; the laser emitting component includes a laser signal modulation device 3 , a laser controller 2 and an infrared laser 1 which are sequentially connected correspondingly. The photoacoustic detection assembly includes a beam splitter 4, a fiber collimator 5, a reference photoacoustic cell 6, a sample photoacoustic cell 7, a sample placement device 8, and a photoacoustic detector 10; On the laser optical path, the laser light is divided into two optical paths with the same optical power; the fiber collimator 5 is respectively arranged on the two optical paths for collimating the outgoing beam; the reference photoacoustic cell 6 and the sample photoacoustic cell 7 are respectively arranged At the end of the two optica...

Embodiment 2

[0030] Embodiment 2: a kind of method that utilizes the fruit ripeness nondestructive detection system based on infrared photoacoustic spectrum to detect the fruit maturity nondestructive detection, comprises the following steps:

[0031] (1) First place the sample to be tested in the sample placement device; then use wavelength modulation spectroscopy technology to add the signal generated by the laser signal modulation device 3 to the laser controller 2, and use the infrared laser driven and controlled by the laser controller 2 1 emits wavelength-modulated laser; the 10.5 μm infrared laser 1 is a quantum cascade laser, the laser signal modulation device 3 is a waveform generator, the laser controller 2 includes a temperature control unit and a current control unit, and the waveform generator will generate a low-frequency triangular wave The signal and the high-frequency sine wave signal are superimposed into the current controller to modulate the wavelength of the emitted las...

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Abstract

The invention relates to the field of fruit ripeness testing and particularly relates to a fruit ripeness nondestructive testing system and method based on an infrared photoacoustic spectrum. The invention aims at solving the problem of interference of light scattering and reflection in a near infrared spectrum testing method so as to improve the testing accuracy. The testing system comprises a laser emission component, a photoacoustic detection component and a signal processing component, wherein the laser emission component comprises a laser signal modulation device, a laser controller and an infrared laser; the photoacoustic detection component comprises an optical splitter, a reference photoacoustic cell, a sample photoacoustic cell and a photoacoustic detector; and the signal processing component comprises a microcontroller, a pre-amplifier and a phase-locked amplifier. The invention has the following beneficial effects: the fruit quality is judged by adopting the infrared laser photoacoustic spectrum to test the ethylene gas emitted by fruits, and then the fruit ripeness is judged according to the content of the ethylene gas emitted by the fruits; and moreover, the interference of light scattering and reflection in the near infrared spectrum testing method is avoided, and thus the testing accuracy is improved.

Description

technical field [0001] The invention relates to the field of fruit maturity detection, in particular to a fruit maturity non-destructive detection system and method based on infrared photoacoustic spectroscopy. Background technique [0002] Fruit maturity is one of the most important qualities of fruits. The detection of fruit maturity can determine the fruit maturity level. According to the detected fruit maturity level, the appropriate fruit picking time can be selected, which will help the subsequent fruit processing, Extend the shelf life of fruits during processing and transportation, prevent the loss of fruit nutrients from affecting fruit quality, and avoid unnecessary economic losses during storage and sales. [0003] Although near-infrared spectroscopy technology has related applications in fruit ripening detection technology, due to the interaction between light and tissue must be accompanied by certain reflection, scattering and other light loss, the penetration d...

Claims

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Application Information

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IPC IPC(8): G01N21/3504G01N21/39
CPCG01N21/3504G01N21/39G01N2201/06113G01N21/1702G01N2021/1704
Inventor 胡建东马刘正孙海峰郭清乾常课课王顺陈睿鹏路朝辉张浩
Owner HENAN AGRICULTURAL UNIVERSITY
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