Device and method for detecting internal deterioration of citrus fruits

Abstract

The invention provides a citrus fruit internal deterioration detection device and method, and relates to the technical field of gas analysis, the device comprises a Fourier transform infrared spectrometer, a gas collection device and a computer; the gas collecting device is placed around the Fourier transform infrared spectrometer, and the computer is connected with the Fourier transform infrared spectrometer; the gas collecting device is used for non-invasively and nondestructively collecting internal gas of the citrus fruits; the Fourier transform infrared spectrometer is used for performing gas spectrum analysis on internal gas of the citrus fruits to obtain spectrum data; and the computer is used for analyzing the spectral data based on the constructed classification prediction model, and determining the internal deterioration degree of the citrus fruit. According to the invention, rapid detection of internal deterioration of citrus fruits is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of gas analysis, and in particular to a device and method for detecting internal deterioration of citrus fruits. Background Art

[0002] Citrus fruits (such as grapefruit, navel orange, etc.) are deeply loved for their unique fragrance and juicy flesh, as well as their rich nutritional value. There is a huge market demand for them, so the testing of their quality is of great significance.

[0003] The quality inspection of citrus fruits is mainly carried out by detecting the volatile organic compounds (VOCs) inside the fruits. Although the existing gas chromatography-mass spectrometry technology has shown good measurement results in VOCs detection, it usually requires long-term gas enrichment and cannot achieve rapid detection. Summary of the invention

[0004] The present invention provides a device and method for detecting internal deterioration of citrus fruits, which are used to solve the defect that the internal deterioration of citrus fruits cannot be detected quickly in the prior art, and to realize the rapid detection of internal deterioration of citrus fruits.

[0005] The present invention provides a device for detecting internal deterioration of citrus fruits, comprising: a Fourier transform infrared spectrometer, a gas collecting device and a computer; The gas collection device is placed around the Fourier transform infrared spectrometer, and the computer is connected to the Fourier transform infrared spectrometer; The gas collection device is used for non-invasive and non-destructive collection of internal gas of citrus fruit; The Fourier transform infrared spectrometer is used to perform gas spectrum analysis on the internal gas of the citrus fruit to obtain spectrum data; The computer is used to analyze the spectral data based on the constructed classification prediction model to determine the internal deterioration degree of the citrus fruit.

[0006] In some embodiments, the gas collection device includes: a gas pool, an air pump, an air inlet pipe, an exhaust pipe, and a gas extraction probe; The gas pool is installed on the Fourier transform infrared spectrometer; the air inlet valve of the gas pool is connected to one end of the air inlet pipe, and the other end of the air inlet pipe is connected to the air extraction probe; the air extraction probe is attached to the peel of the citrus fruit; the exhaust valve of the gas pool is connected to one end of the exhaust pipe, and the other end of the exhaust pipe is connected to the air pump; The gas extraction probe is used for non-invasive and non-destructive collection of internal gas of the citrus fruit; The air pump is used to put the gas pool in a negative pressure state; The gas tank is used to store the internal gas of the citrus fruit.

[0007] In some embodiments, the present invention further provides a method for detecting internal deterioration of citrus fruit according to any of the above-mentioned devices for detecting internal deterioration of citrus fruit, comprising: The spectral data of the internal gas of the citrus fruit to be detected is input into the constructed classification prediction model to obtain the internal deterioration degree of the citrus fruit to be detected.

[0008] In some embodiments, the method further comprises: A classification prediction model is constructed based on the spectral data of the internal gas of the citrus fruit sample and the internal deterioration degree of the citrus fruit sample; the citrus fruit sample is a healthy citrus fruit inoculated with fungi.

[0009] In some embodiments, the method further comprises: Comparing the spectrum of air with the spectrum data of the internal gas of the citrus fruit sample to determine the spectral range corresponding to the change in the absorption peak position; The spectral range corresponding to the change in the absorption peak position is compared with the standard spectrum in the NIST database to determine the type of gas produced by the citrus fruit sample after fungal infection.

[0010] In some embodiments, the method further comprises: The internal deterioration degree of the citrus fruit sample is determined according to the fungal infection time of the citrus fruit sample and the appearance of the citrus fruit sample.

[0011] The present invention provides a citrus fruit internal deterioration detection system, which is applied to a computer in any of the above-mentioned citrus fruit internal deterioration detection devices, comprising: The input module is used to input the spectral data of the internal gas of the citrus fruit to be detected into the constructed classification prediction model to obtain the internal deterioration degree of the citrus fruit to be detected.

[0012] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, any of the above-mentioned methods for detecting internal deterioration of citrus fruits is implemented.

[0013] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the method for detecting internal deterioration of citrus fruits as described in any one of the above is implemented.

[0014] The present invention also provides a computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the method for detecting internal deterioration of citrus fruit as described above is implemented.

[0015] The device and method for detecting internal deterioration of citrus fruit provided by the present invention collect internal gas of citrus fruit by means of a gas collection device, analyze the gas spectrum by means of a Fourier transform infrared spectrometer, quickly and non-destructively obtain spectral information of the internal gas of citrus fruit, analyze the spectral data by means of a classification prediction model, determine the degree of internal deterioration of citrus fruit, and thus realize rapid detection of internal deterioration of citrus fruit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is one of the structural schematic diagrams of the device for detecting internal deterioration of citrus fruits provided by the present invention; Figure 2 This is the second structural schematic diagram of the device for detecting internal deterioration of citrus fruits provided by the present invention; Figure 3 It is a schematic diagram of the process of the method for detecting internal deterioration of citrus fruits provided by the present invention; Figure 4 This is the PLS-DA model recognition score diagram of the grapefruit stage infected by Penicillium; Figure 5 It is a schematic diagram of the structure of the internal deterioration detection system of citrus fruits provided by the present invention; Figure 6 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Citrus fruits (such as grapefruit and navel orange) are generally very susceptible to infection by fungi such as Penicillium and Green Mold. In the early stage of infection inside the fruit, the naked eye cannot observe obvious infection characteristics from its appearance. When soft rot or colonies are observed from the appearance, the inside of the fruit has been seriously infected. In order to reduce the number of infections and reduce cost and economic losses, it is necessary to detect whether the fruit is infected as early as possible and isolate it from healthy fruits.

[0020] The peel plays a major role in hindering the gas exchange process of the fruit, limiting the diffusion of the internal gas of the fruit to the external environment. Therefore, in the early stage of the internal gas generation of the fruit, it only exists in its internal gaps due to the obstruction of a certain thickness of the peel. The study of the internal gas of the fruit is of great significance to the state of the fruit. Compared with the VOCs volatilized into the environment, the VOCs existing inside can reflect the state of the fruit one step earlier in terms of the time of generation. From the perspective of gas types, the types of internal gases may be richer. Therefore, the non-destructive collection and detection of internal gases is of great significance for timely grasp of the state of the fruit.

[0021] Although the existing gas chromatography-mass spectrometry technology has shown good measurement results in VOCs detection, it usually requires long-term gas enrichment and cannot achieve rapid detection.

[0022] Figure 1 This is one of the structural schematic diagrams of the internal deterioration detection device for citrus fruits provided by the present invention, referring to Figure 1 As shown, the device for detecting internal deterioration of citrus fruits provided by the present invention comprises: a Fourier transform infrared spectrometer, a gas collecting device and a computer.

[0023] The gas collection device is placed around the Fourier transform infrared spectrometer, and the computer is connected to the Fourier transform infrared spectrometer; The gas collection device is used for non-invasive and non-destructive collection of internal gas of citrus fruit; A Fourier transform infrared spectrometer is used to perform gas spectrum analysis on the internal gas of the citrus fruit to obtain spectrum data; Computers are used to analyze the spectral data based on the constructed classification prediction model to determine the degree of internal deterioration of citrus fruits.

[0024] Specifically, the gas collection device is used to non-invasively and non-destructively collect the internal gas of citrus fruits and is placed around a Fourier Transform Infrared Spectroscopy (FTIR) instrument ( Figure 1The dotted line in the figure does not represent a physical connection, but only indicates that the gas collecting device is located near the Fourier transform infrared spectrometer), so that the Fourier transform infrared spectrometer can perform gas spectrum analysis on the internal gas of the citrus fruit in the gas collecting device to obtain spectrum data.

[0025] Fourier transform infrared spectrometer is an instrument that uses Fourier transform and other methods to convert time domain signals into frequency domain signals to generate infrared spectra. Fourier transform infrared spectrometer is mainly composed of infrared light source, beam splitter, interferometer, detector and computer. In gas measurement, its principle is mainly to modulate the infrared light emitted by the light source through Michelson interferometer and then detect it by the detector, so as to convert the optical signal containing frequency intensity from time domain digital signal to frequency domain digital signal, and obtain the infrared spectrum of the gas, which contains the molecular species information of the measured gas.

[0026] Since the Fourier transform infrared spectrometer has a fast measurement speed and can analyze gas samples without complex pretreatment, it has unique advantages and application prospects in rapid measurement. Therefore, the Fourier transform infrared spectrometer is used to perform spectral analysis of the internal gas of citrus fruits to achieve rapid detection.

[0027] The computer is connected to the Fourier transform infrared spectrometer, and the Fourier transform infrared spectrometer transmits the spectral data to the computer. Since the constructed classification prediction model, such as the Partial Least Squares Discriminant Analysis (PLS-DA) model, can determine the correspondence between the spectral range of the internal gas of citrus fruits and the internal deterioration degree of citrus fruits, the computer can analyze the spectral data based on the constructed classification prediction model to determine the internal deterioration degree of citrus fruits.

[0028] The citrus fruit internal deterioration detection device provided by the present invention collects the internal gas of the citrus fruit by a gas collection device, analyzes the gas spectrum by a Fourier transform infrared spectrometer, quickly and non-destructively obtains the spectral information of the internal gas of the citrus fruit, analyzes the spectral data by a classification prediction model, determines the internal deterioration degree of the citrus fruit, thereby realizing the rapid detection of the internal deterioration of the citrus fruit.

[0029] In some embodiments, Figure 2 This is a second structural diagram of the internal deterioration detection device for citrus fruits provided by the present invention, referring to Figure 2 As shown, the gas collection device includes: a gas pool, an air pump, an air inlet pipe, an exhaust pipe and a gas extraction probe.

[0030] The gas pool is installed on the Fourier transform infrared spectrometer; the air inlet valve of the gas pool is connected to one end of the air inlet pipe, and the other end of the air inlet pipe is connected to the air extraction probe; the air extraction probe is attached to the peel of the citrus fruit; the exhaust valve of the gas pool is connected to one end of the exhaust pipe, and the other end of the exhaust pipe is connected to the air pump; The gas extraction probe is used for non-invasive and non-destructive collection of internal gases in citrus fruits; The air pump is used to keep the gas pool in a negative pressure state; The gas pool is used to store the internal gases of citrus fruits.

[0031] Specifically, the gas pool is installed on the Fourier transform infrared spectrometer, that is, the gas pool is installed at the detection position of the Fourier transform infrared spectrometer, so that the Fourier transform infrared spectrometer can perform gas spectrum analysis on the internal gas of the citrus fruit in the gas pool to obtain spectrum data.

[0032] The air inlet valve of the gas pool is connected to one end of the air inlet pipe, the other end of the air inlet pipe is connected to the air extraction probe, the exhaust valve of the gas pool is connected to one end of the exhaust pipe, and the other end of the exhaust pipe is connected to the air pump. The exhaust probe is attached to the peel of citrus fruits in a non-invasive and non-destructive manner to extract the internal gas of the fruit. The edge of the exhaust probe can be arc-shaped to better fit the surface of the peel to increase the contact area between the exhaust probe and the peel of the citrus fruit, that is, to increase the negative pressure area to effectively improve the internal gas collection efficiency. The internal gas of citrus fruits is collected by extraction, and the collected internal gas of citrus fruits is stored in the gas pool. The air pump puts the gas pool in a negative pressure state, so as to more stably extract the internal gas of a wider range of citrus fruits.

[0033] The citrus fruit internal deterioration detection device provided by the present invention realizes the rapid and non-destructive collection of the internal gas of the citrus fruit by attaching the air extraction probe to the peel of the citrus fruit and the air pump to put the gas pool in a negative pressure state.

[0034] Figure 3 FIG. 1 is a flow chart of a method for detecting internal deterioration of citrus fruits provided by the present invention. Figure 3 As shown, according to any of the above-mentioned citrus fruit internal deterioration detection devices, the present invention provides a citrus fruit internal deterioration detection method, comprising: Step 310: Input the spectral data of the internal gas of the citrus fruit to be detected into the constructed classification prediction model to obtain the internal deterioration degree of the citrus fruit to be detected.

[0035] Specifically, a constructed classification prediction model such as a PLS-DA model can determine the correspondence between the spectral range of the internal gas of citrus fruits and the degree of internal deterioration of the citrus fruits. The spectral data of the internal gas of the citrus fruits to be tested is input into the constructed classification prediction model, and the constructed classification prediction model analyzes the spectral data and outputs the degree of internal deterioration of the citrus fruits to be tested.

[0036] The method for detecting internal deterioration of citrus fruits provided by the present invention can determine the internal deterioration degree of the citrus fruits to be detected by constructing a classification prediction model.

[0037] In some embodiments, the method for detecting internal deterioration of citrus fruit provided by the present invention further comprises: A classification prediction model is constructed based on the spectral data of the internal gas of the citrus fruit samples and the internal deterioration degree of the citrus fruit samples; the citrus fruit samples are healthy citrus fruits inoculated with fungi.

[0038] Specifically, the fungus (Penicillium, Chlorella, etc.) is inoculated on the fruit of healthy citrus fruit, and the specific process can be: using a sterile needle to send the fungal spores into the subcutaneous part of the healthy citrus fruit.

[0039] The spectral data of the internal gas of the citrus fruit samples are collected at regular intervals, and the internal deterioration degree of the citrus fruit samples is determined at regular intervals. The spectral data of the internal gas of the citrus fruit samples and the corresponding internal deterioration degree of the citrus fruit samples are input into a classification prediction model for training to obtain a constructed classification prediction model, which can determine the corresponding relationship between the spectral range of the internal gas of the citrus fruit and the internal deterioration degree of the citrus fruit.

[0040] Exemplarily, the spectral data of the internal gas of a citrus fruit sample may be collected by the following steps: Open the air pump and the air inlet and exhaust valves of the gas pool, continue to pump air for 3 minutes, then turn off the air pump and collect the spectral data of the air in the gas pool as the background. The air extraction probe is attached to the skin of the citrus fruit sample, the air pump and the air inlet and exhaust valves of the gas pool are opened, the computer uses the continuous measurement mode, keeps the gas pool pressure gauge stable at -10kPa, and collects 30 spectral data; after measurement, the 30 spectral data obtained every day are screened, and 15 stable spectral data are selected and retained for analysis.

[0041] In some embodiments, in order to eliminate the possible effects of mechanical damage caused by sterile needle inoculation on the internal gas of citrus fruit, the daily spectral data changes of fruit samples with only damage and healthy fruit samples were compared to eliminate the impact of this treatment on the internal gas of the fruit.

[0042] In some embodiments, the method for detecting internal deterioration of citrus fruit provided by the present invention further comprises: Comparing the spectrum of air with the spectrum data of the internal gas of the citrus fruit sample, determining the spectral range corresponding to the change in the position of the absorption peak; The spectral range corresponding to the change in the absorption peak position is compared with the standard spectrum in the NIST database to determine the type of gas produced by the citrus fruit sample after fungal infection.

[0043] Specifically, the air spectrum is compared with the spectral data of the internal gas of the citrus fruit sample to determine the spectral range corresponding to the change in the absorption peak position, and the spectral range corresponding to the change in the absorption peak position is compared with the standard spectrum in the NIST (National Institute of Standards and Technology) database to determine the category of gas produced by the citrus fruit sample after fungal infection. This part of the spectral data is retained for modeling the classification prediction model.

[0044] For example, after Penicillium infects grapefruit, the absorption peak position changes significantly in the range of 1200 cm -1 -1000cm -1 By comparing the standard spectrum of the NIST database, it can be seen that the gas gradually produced inside the grapefruit after being infected with Penicillium is methanol. This part of the spectral data is retained for modeling the classification prediction model.

[0045] The method for detecting internal deterioration of citrus fruit provided by the present invention determines the spectral range corresponding to the change in the absorption peak position by comparing the air spectrum with the spectral data of the internal gas of the citrus fruit sample; the spectral range corresponding to the change in the absorption peak position is compared with the standard spectrum in the NIST database to determine the type of gas generated by the citrus fruit sample after fungal infection, thereby achieving the construction of a more accurate classification prediction model.

[0046] In some embodiments, the method for detecting internal deterioration of citrus fruit provided by the present invention further comprises: The internal deterioration degree of the citrus fruit samples is determined based on the fungal infection time of the citrus fruit samples and the appearance of the citrus fruit samples.

[0047] Specifically, if after grapefruit is inoculated with Penicillium, there is no abnormality in the appearance of the grapefruit on the 1st to 5th day, and the grapefruit is considered to be in the "fresh" stage; on the 6th to 13th day, the infected area becomes slightly soft and water-soaked soft rot appears, and it is considered to be in the "mildly corrupt" stage; after the 14th day, the infected grapefruit becomes obviously soft and white hyphae appear, and it is considered to be "severely corrupt".

[0048] In some embodiments, the degree of internal deterioration of citrus fruits after fungal infection can be determined based on the changes in appearance after fungal infection combined with the internal gas production. For example, the degree of internal deterioration of grapefruit after Penicillium infection is divided into three stages. From 1 to 5 days after infection, the grapefruit is considered to be in the "fresh" stage because no methanol is produced and there is no obvious change in appearance; from 6 to 13 days, it is considered to be in the "mild infection" stage because the measured absorbance of methanol does not exceed 0.2 and brown water stains are produced. After the 14th day, the infected grapefruit becomes noticeably soft to the touch and produces obvious white hyphae, which is considered to be "severely infected".

[0049] Figure 4 This is the PLS-DA model recognition score diagram of the stage of Penicillium infection in grapefruit. The spectral data of grapefruit infected with Penicillium is analyzed as an example. After PLS-DA analysis of the spectral data, the score diagrams of the first two principal components are obtained, as shown in Figure 4 As shown. Among them, the eigenvalues ​​of the first two principal components PC1 contributed 58.6%, PC2 contributed 39.4%, and the sum of the principal component contributions was 98%, with small differences within the sample group. Its fitting parameters R2X=0.998, R2X=0.842, Q2=0.786, and Q2 value greater than 0.4 indicate that the PLS-DA model has good stability.

[0050] In order to verify the reliability of the classification prediction model, 70% of the total spectral data was used to build the classification prediction model, and 30% of the spectral data was used for prediction. In the model of grapefruit infected with Penicillium, PLS-DA modeling was used, and the recognition rate of the corresponding prediction set was 97.90%, which can meet the requirements of rapid and accurate classification and discrimination of infected grapefruit.

[0051] The following is a description of the citrus fruit internal deterioration detection system provided by the present invention. The citrus fruit internal deterioration detection system described below and the citrus fruit internal deterioration detection method described above can be referenced to each other.

[0052] Figure 5 FIG. 1 is a schematic diagram of the structure of the internal deterioration detection system for citrus fruits provided by the present invention. Figure 5 As shown, the present invention provides a citrus fruit internal deterioration detection system, which is applied to a computer in any of the above-mentioned citrus fruit internal deterioration detection devices, comprising: The input module 510 is used to input the spectral data of the internal gas of the citrus fruit to be detected into the constructed classification prediction model to obtain the internal deterioration degree of the citrus fruit to be detected.

[0053] In some embodiments, the system further comprises: A construction module is used to construct a classification prediction model based on the spectral data of the internal gas of the citrus fruit sample and the internal deterioration degree of the citrus fruit sample; the citrus fruit sample is a healthy citrus fruit inoculated with fungi.

[0054] In some embodiments, the system further comprises: A first comparison module is used to compare the air spectrum with the spectrum data of the internal gas of the citrus fruit sample to determine the spectral range corresponding to the change in the absorption peak position; The second comparison module is used to compare the spectral range corresponding to the change in the absorption peak position with the standard spectrum in the NIST database to determine the type of gas generated by the citrus fruit sample after fungal infection.

[0055] In some embodiments, the system further comprises: The determination module is used to determine the internal deterioration degree of the citrus fruit sample according to the fungal infection time of the citrus fruit sample and the appearance of the citrus fruit sample.

[0056] Figure 6 is a schematic diagram of the structure of the electronic device provided by the present invention, such as Figure 6 As shown, the electronic device may include: a processor 610, a communication interface 620, a memory 630 and a communication bus 640, wherein the processor 610, the communication interface 620 and the memory 630 communicate with each other through the communication bus 640. The processor 610 may call the logic instructions in the memory 630 to execute the method for detecting the internal deterioration of citrus fruit, which includes: inputting the spectral data of the internal gas of the citrus fruit to be detected into the constructed classification prediction model to obtain the internal deterioration degree of the citrus fruit to be detected.

[0057] In addition, the logic instructions in the above-mentioned memory 630 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0058] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the method for detecting internal deterioration of citrus fruit provided by the above-mentioned methods. The method includes: inputting the spectral data of the internal gas of the citrus fruit to be detected into a constructed classification prediction model to obtain the degree of internal deterioration of the citrus fruit to be detected.

[0059] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to execute the method for detecting internal deterioration of citrus fruit provided by the above-mentioned methods, the method comprising: inputting the spectral data of the internal gas of the citrus fruit to be detected into a constructed classification prediction model to obtain the degree of internal deterioration of the citrus fruit to be detected.

[0060] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0061] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for detecting internal deterioration of citrus fruits, characterized in that: include: Fourier transform infrared spectrometer, gas collection device, and computer; The gas collection device is placed around the Fourier transform infrared spectrometer, and the computer is connected to the Fourier transform infrared spectrometer; The gas collection device is used for non-invasive and non-destructive collection of internal gas of citrus fruit; The Fourier transform infrared spectrometer is used to perform gas spectrum analysis on the internal gas of the citrus fruit to obtain spectrum data; The computer is used to analyze the spectral data based on the constructed classification prediction model to determine the internal deterioration degree of the citrus fruit.

2. The citrus fruit internal deterioration detection device according to claim 1, characterized in that: The gas collection device comprises: a gas pool, an air pump, an air inlet pipe, an exhaust pipe and a gas extraction probe; The gas pool is installed on the Fourier transform infrared spectrometer; the air inlet valve of the gas pool is connected to one end of the air inlet pipe, and the other end of the air inlet pipe is connected to the air extraction probe; the air extraction probe is attached to the peel of the citrus fruit; the exhaust valve of the gas pool is connected to one end of the exhaust pipe, and the other end of the exhaust pipe is connected to the air pump; The gas extraction probe is used for non-invasive and non-destructive collection of internal gas of the citrus fruit; The air pump is used to put the gas pool in a negative pressure state; The gas tank is used to store the internal gas of the citrus fruit.

3. The method for detecting internal deterioration of citrus fruits according to any one of claims 1 to 2, characterized in that: include: The spectral data of the internal gas of the citrus fruit to be detected is input into the constructed classification prediction model to obtain the internal deterioration degree of the citrus fruit to be detected.

4. The method for detecting internal deterioration of citrus fruit according to claim 2, characterized in that: The method further comprises: A classification prediction model is constructed based on the spectral data of the internal gas of the citrus fruit sample and the internal deterioration degree of the citrus fruit sample; the citrus fruit sample is a healthy citrus fruit inoculated with fungi.

5. The method for detecting internal deterioration of citrus fruit according to claim 4, characterized in that: The method further comprises: Comparing the spectrum of air with the spectrum data of the internal gas of the citrus fruit sample to determine the spectrum range corresponding to the change in the absorption peak position; The spectral range corresponding to the change in the absorption peak position is compared with the standard spectrum in the NIST database to determine the type of gas produced by the citrus fruit sample after fungal infection.

6. The method for detecting internal deterioration of citrus fruit according to claim 4, characterized in that: The method further comprises: The internal deterioration degree of the citrus fruit sample is determined according to the fungal infection time of the citrus fruit sample and the appearance of the citrus fruit sample.

7. A citrus fruit internal deterioration detection system, characterized in that: The computer used in the device for detecting internal deterioration of citrus fruit according to any one of claims 1 to 2 comprises: The input module is used to input the spectral data of the internal gas of the citrus fruit to be detected into the constructed classification prediction model to obtain the internal deterioration degree of the citrus fruit to be detected.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the method for detecting internal deterioration of citrus fruit as claimed in any one of claims 3 to 6 is implemented.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for detecting internal deterioration of citrus fruit as claimed in any one of claims 3 to 6 is implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the method for detecting internal deterioration of citrus fruit as claimed in any one of claims 3 to 6 is implemented.

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