Fresh meat freshness monitoring device and method

Abstract

This invention relates to the field of fresh meat freshness detection technology, and more particularly to a fresh meat freshness monitoring device and method. The device includes: a testing platform; a conductivity testing module for testing the conductivity of fresh meat, including a sampler for sampling fresh meat to obtain a test meat strip and testing the conductivity of the test meat strip by connecting the test meat strip to a conductive circuit; an image acquisition module for acquiring surface images of fresh meat and the test meat strip, including a meat strip image acquisition unit for acquiring the surface image of the test meat strip and a fresh meat image acquisition unit for acquiring the surface image of fresh meat; and a freshness analysis module for determining the sampling rate of the sampler based on the maximum displacement of fresh meat per unit time, and determining whether the fresh meat is fresh based on the average color of the surface image of the test meat strip and the conductivity of the fresh meat. This invention improves the detection accuracy and the precision of the detection results.

Description

Technical Field

[0001] This invention relates to the field of fresh meat freshness detection technology, and in particular to a fresh meat freshness monitoring device and method. Background Technology

[0002] In existing technologies, commonly used physicochemical indicators for detecting meat freshness include TVB-N content, pH value, conductivity, color, and tenderness. Among these, the principle of using conductivity to test meat freshness is that as meat freshness declines, certain components decompose. Since the decomposition products contain a large number of conductive substances (such as Na, Cl, and K ions), the freshness can be inferred based on the conductivity value. Commonly used techniques for detecting meat freshness also include physical indicator detection, such as meat color determination, elasticity and firmness testing, and microbiological indicator detection, such as total bacterial count determination and specific microorganism detection. However, these traditional detection methods have limitations such as low detection accuracy or long processing time, and cannot provide timely and accurate information on freshness. Rapid and accurate monitoring methods have become a development trend in meat freshness detection.

[0003] Chinese Patent Publication No. CN109856196B discloses a device and method for monitoring the freshness of chilled meat. The device for monitoring the freshness of chilled meat includes an interdigitated electrode hydrogen sulfide sensor, a paper battery, and an electrochromic device.

[0004] The interdigitated electrode hydrogen sulfide sensor is inserted into the fresh meat packaging, and the two ends of the paper battery are respectively connected to the interdigitated electrode hydrogen sulfide sensor and the electrochromic device to form an equivalent circuit.

[0005] The interdigitated electrode hydrogen sulfide sensor is used to react with hydrogen sulfide and change its impedance value. When the impedance value of the interdigitated electrode hydrogen sulfide sensor is a first preset threshold, the equivalent circuit is turned on. The freshness of chilled meat corresponding to the first preset threshold impedance value of the interdigitated electrode hydrogen sulfide sensor is obtained based on a pre-established model of freshness of chilled meat - impedance value of interdigitated electrode hydrogen sulfide sensor.

[0006] The electrochromic device is used to change color when the equivalent circuit is turned on;

[0007] The monitoring method of the chilled meat freshness monitoring device includes:

[0008] S1, Connect the interdigitated electrode hydrogen sulfide sensor to the fresh meat packaging; wherein, the interdigitated electrode hydrogen sulfide sensor is connected to the paper battery and the electrochromic device respectively, and forms an equivalent circuit.

[0009] S2, if the electrochromic device changes color, it is determined that the equivalent circuit is conducting and the impedance value of the interdigital electrode hydrogen sulfide sensor is the first preset threshold.

[0010] S3. Based on the impedance value of the interdigitated electrode hydrogen sulfide sensor and the pre-established model of fresh meat freshness - impedance value of interdigitated electrode hydrogen sulfide sensor, the freshness of the chilled meat is obtained.

[0011] In step S3, the process of establishing the model for the freshness of chilled meat-interdigitated electrode hydrogen sulfide sensor impedance value includes:

[0012] S31. Collect the time series corresponding to the storage and transportation environment temperature, hydrogen sulfide gas concentration and volatile basic nitrogen (TVB-N) content in fresh meat packaging, and establish a hydrogen sulfide concentration-freshness model based on the correspondence between volatile basic nitrogen (TVB-N) content and freshness of chilled meat.

[0013] S32, Place the interdigitated electrode hydrogen sulfide sensor into fresh meat packages with different hydrogen sulfide concentrations, and collect the impedance values ​​of the interdigitated electrode hydrogen sulfide sensor corresponding to different hydrogen sulfide concentrations.

[0014] S33. Based on the impedance values ​​of the interdigitated electrode hydrogen sulfide sensors corresponding to different hydrogen sulfide concentrations and the hydrogen sulfide concentration-freshness model of chilled meat, a model for chilled meat freshness-interdigitated electrode hydrogen sulfide sensor impedance value is established. It can be seen that the chilled meat freshness monitoring device and method suffer from problems such as decreased detection accuracy due to varying volumes of the tested meat and decreased accuracy of detection results due to the influence of water-injected meat on the meat quality environment. Summary of the Invention

[0015] Therefore, the present invention provides a fresh meat freshness monitoring device and method to overcome the problems in the prior art where the detection accuracy decreases due to the different volumes of the tested meat and the accuracy of the detection results decreases due to the influence of water-injected meat on the meat quality environment of the tested meat.

[0016] To achieve the above objectives, the present invention provides a fresh meat freshness monitoring device, comprising:

[0017] Test platform;

[0018] A conductivity testing module, which is connected to the testing platform, is used to test the conductivity of fresh meat. It includes a sampler for sampling fresh meat to obtain a meat strip to be tested and a conductivity testing component connected to the sampler to test the conductivity of the meat strip by connecting the meat strip to a conductive circuit.

[0019] An image acquisition module is disposed above the test platform to acquire surface images of fresh meat and the meat strips under test, including a meat strip image acquisition unit disposed above the sampler to acquire surface images of the meat strips under test and a fresh meat image acquisition unit disposed on the side of the test platform away from the sampler to acquire surface images of fresh meat.

[0020] The freshness analysis module is connected to the conductivity testing module and the image acquisition module respectively. It is used to determine the sampling rate of the sampler based on the maximum displacement of the fresh meat per unit time, and to determine whether the fresh meat is fresh based on the average chromaticity of the surface color of the tested meat strip and the conductivity of the fresh meat.

[0021] Furthermore, the sampler has a three-dimensional structure that is a hollow semi-cylinder with a semi-circular bottom.

[0022] Furthermore, the conductivity testing component includes:

[0023] An electrode assembly, disposed on the inner wall of the sampler, is used to pass an electric current through the meat strip being tested;

[0024] An ammeter, connected to the electrode assembly, is used to detect the current passing through the meat strip under test.

[0025] Furthermore, the test platform is also equipped with a robotic arm connected to the sampler to adjust the sampling rate and height of the sampler.

[0026] Furthermore, the freshness analysis module is connected to the fresh meat image acquisition unit and the robotic arm respectively, and is used to acquire the surface image of the fresh meat when the fresh meat is above the test platform, and to perform edge detection on the surface image of the fresh meat, calculate the maximum displacement of several points on the edge of the surface image of the fresh meat per unit time. If the maximum displacement is greater than or equal to the preset maximum displacement, it is determined that the sampling stability does not meet the requirements, and the sampling rate of the sampler is reduced.

[0027] Furthermore, the decrease in the sampling rate of the sampler is positively correlated with the maximum displacement.

[0028] Furthermore, the freshness analysis module is connected to the conductivity testing module to obtain the current in the conductive circuit after the tested meat strip is connected to the conductivity testing component, and to calculate the conductivity of the tested meat strip. If the conductivity is greater than or equal to the preset conductivity, it is determined that the conductivity of the tested meat strip does not meet the requirements.

[0029] The conductivity of the tested meat strip is the ratio of the current in the conductive circuit to the cross-sectional area of ​​the tested meat strip parallel to the bottom surface of the sampler.

[0030] Furthermore, the freshness analysis module is connected to the meat strip image acquisition unit to obtain the average chromaticity of the surface color of the inspected meat strip at the end of the detection cycle. If the average chromaticity exceeds the chromaticity threshold, the surface freshness of the inspected meat strip is determined to be unsatisfactory.

[0031] Furthermore, the freshness analysis module is connected to the conductivity testing module and the meat strip image acquisition unit respectively, and is used to determine that the meat is not fresh when the conductivity of the tested meat strip does not meet the requirements and the surface freshness does not meet the requirements.

[0032] The present invention also provides a freshness monitoring method for a fresh meat freshness monitoring device, comprising:

[0033] Acquire a surface image of fresh meat and calculate the maximum displacement of several points on the edge of the fresh meat surface per unit time.

[0034] Adjust the sampling rate of the sampler according to the maximum displacement;

[0035] Use a sampler to collect meat strips for testing from the fresh meat at the sampling rate described;

[0036] Obtain the current in the circuit after the conductivity testing component is connected to the meat strip under test;

[0037] The conductivity of the tested meat strip is calculated based on the current.

[0038] Obtain the average chromaticity of the surface color of the inspected meat strip;

[0039] The freshness of the meat is determined based on the conductivity and average chromaticity of the surface color of the tested meat strips.

[0040] Compared with existing technologies, the beneficial effects of this invention are as follows: The system of this invention, by setting up a test platform, a conductivity test module, an image acquisition module, and a freshness analysis module, samples fresh meat to detect its freshness. Since the volume of fresh meat is inconsistent, sampling fresh meat with equal cross-sections and lengths facilitates rapid automated detection, improves the consistency of the detected objects, and accurately reflects the overall freshness of the meat, thus improving detection accuracy. By detecting the surface image of the fresh meat, the system addresses the uneven sampling of meat strips due to the varying vertical heights of the meat on the conveyor belt. The sampling rate of the sampler is determined to improve the uniformity of meat sampling. Furthermore, by detecting the surface image of the tested meat strips, the freshness is further determined. Water injection in fresh meat increases conductivity, leading to misjudgments of stale meat. Detecting the surface image of the tested meat strips reduces the impact of water injection on the accuracy of the detection results, thus improving both detection accuracy and the accuracy of the detection results.

[0041] Furthermore, the system described in this invention, by setting up a conductivity testing component, can accurately measure the current in the conductive circuit through the electrode plates and ammeter in the conductivity testing component, thereby accurately calculating the conductivity of the tested meat strip, providing accurate data for freshness analysis and enabling rapid detection, thus improving detection efficiency.

[0042] Furthermore, the system of the present invention, by setting a preset maximum displacement and a robotic arm, addresses the issue of unstable morphology of fresh meat on the testing platform due to varying thicknesses, which leads to decreased detection stability. By precisely controlling the sampling rate, the uniformity and stability of the tested meat strips during sampling are improved. When the fresh meat reaches the testing platform, the robotic arm can adjust the sampling rate of the sampler in real time according to the maximum displacement of the fresh meat, reducing the problem of uneven sampling caused by unstable morphology of the fresh meat and improving the accuracy of the detection results.

[0043] Furthermore, the system of the present invention sets a preset conductivity. When the conductivity of the tested meat strip exceeds the preset value, the system determines that its conductivity does not meet the requirements, thereby effectively distinguishing stale fresh meat that has produced conductive substances that cause abnormally high conductivity, thus improving the detection accuracy.

[0044] Furthermore, the system of the present invention sets a color threshold. Since the difference in surface color is related to the freshness of the meat, by comparing the difference between the surface color and the color threshold, the system can more accurately determine the freshness of the meat. When the surface color of the inspected meat strip exceeds the preset threshold, the system will determine that the freshness of the meat strip does not meet the requirements, thereby improving the detection accuracy.

[0045] Furthermore, the system of the present invention detects conductivity and acquires surface images of the tested meat strips. Since the increased moisture content in water-injected meat affects the accuracy of the conductivity testing module, the conductivity detection result increases. By combining the surface images with a comprehensive assessment of the freshness of the tested meat strips, the accuracy of the detection results is improved. During the detection process, if the conductivity of the tested meat strip is abnormally high, but the surface color does not exceed the threshold, the system can accurately determine that the tested meat strip is suspected of being water-injected, thereby avoiding misjudgments caused by water injection and improving detection accuracy. This further enhances the anti-interference capability of the freshness analysis module and the accuracy of the detection results. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the overall structure of the fresh meat freshness monitoring device according to an embodiment of the present invention;

[0047] Figure 2 This is a schematic diagram of the overall structure of the fresh meat freshness monitoring device according to another embodiment of the present invention;

[0048] Figure 3 This is a schematic diagram of the sampler and conductivity testing component of the fresh meat freshness monitoring device according to an embodiment of the present invention;

[0049] Figure 4 This is an overall flowchart of the fresh meat freshness monitoring method according to an embodiment of the present invention;

[0050] The reference numerals are as follows: 1-Test platform, 2-Conveyor belt, 3-Meat strip image acquisition unit, 4-Robotic arm, 5-Ammeter, 6-Sampler, 7-Fresh meat, 8-Fresh meat image acquisition unit, 9-Positive electrode plate, 10-Negative electrode plate. Detailed Implementation

[0051] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0052] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0053] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0054] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0055] Please see Figure 1 , Figure 2 , Figure 3 as well as Figure 4 The figures shown are, respectively, an overall structural schematic diagram of the fresh meat freshness monitoring device and method according to an embodiment of the present invention, an overall structural schematic diagram from another angle, a structural schematic diagram of the sampler and conductivity testing component, and an overall flowchart. The present invention provides a fresh meat freshness monitoring device, comprising:

[0056] Test platform 1;

[0057] A conductivity testing module, which is connected to the testing platform 1, is used to test the conductivity of fresh meat 7. It includes a sampler 6 for sampling fresh meat 7 to obtain meat strips to be tested, and a conductivity testing component connected to the sampler 6 to test the conductivity of the meat strips to be tested by connecting the meat strips to a conductive circuit.

[0058] An image acquisition module is set above the test platform 1 to acquire surface images of fresh meat 7 and the meat strip under test, including a meat strip image acquisition unit 3 set above the sampler 6 to acquire surface images of the meat strip under test and a fresh meat image acquisition unit 8 set on the side of the test platform 1 away from the sampler 6 to acquire surface images of fresh meat 7.

[0059] The freshness analysis module is connected to the conductivity testing module and the image acquisition module respectively. It is used to determine the sampling rate of the sampler 6 based on the maximum displacement of the fresh meat 7 per unit time, and to determine whether the fresh meat 7 is fresh based on the average chromaticity of the surface color of the tested meat strip and the conductivity of the fresh meat 7.

[0060] In implementation, the system of this invention, by setting up a test platform 1, a conductivity testing module, an image acquisition module, and a freshness analysis module, samples fresh meat 7 to detect its freshness. Since the volume of fresh meat 7 is inconsistent, sampling fresh meat 7 with equal cross-sections and lengths facilitates rapid automated detection, improves the consistency of the detected objects, and accurately reflects the overall freshness of the fresh meat 7, thus improving detection accuracy. By detecting the surface image of the fresh meat 7, it is found that after the fresh meat 7 arrives on the conveyor belt 2, the vertical height of the fresh meat 7 varies. The unstable shape of the higher-height fresh meat 7 leads to uneven sampling of the tested meat strips by the sampler 6. By determining the sampling rate of the sampler 6, the uniformity of the fresh meat 7 sampling is improved. By detecting the surface image of the tested meat strips, the freshness is further determined based on the surface image. If fresh meat 7 is injected with water, resulting in increased conductivity, it may be mistakenly judged as stale meat. By detecting the surface image of the tested meat strips, the impact of water-injected meat on the accuracy of the detection results is reduced, thus improving both detection accuracy and the accuracy of the detection results.

[0061] Specifically, the sampler 6 has a three-dimensional structure as a hollow semi-cylinder with a semi-circular bottom.

[0062] Specifically, the sampler 6 is made of insulating material, and a preferred embodiment of the sampler 6 material is ceramic.

[0063] Specifically, in a preferred embodiment, the sampler 6 has a bottom semicircular diameter of 0.6 cm and a length of 20 cm. In practice, those skilled in the art can change the size and material of the sampler 6, as long as the bottom semicircular diameter of the sampler 6 is much smaller than the length of the sampler 6.

[0064] Specifically, the conductivity testing component includes:

[0065] An electrode assembly, disposed on the inner wall of the sampler 6, is used to pass an electric current through the meat strip being tested;

[0066] Ammeter 5, which is connected to the electrode assembly, is used to detect the current passing through the meat strip under test.

[0067] Specifically, the electrode assembly includes a positive electrode 9 disposed inside the sampler 6 on the side close to the robotic arm 4 and a negative electrode 10 disposed on the inner wall of the sampler 6 on the side away from the robotic arm 4.

[0068] In practice, the system described in this invention, by setting up a conductivity testing component, can accurately measure the current in the conductive circuit through the electrode plate and ammeter 5 in the conductivity testing component, thereby accurately calculating the conductivity of the tested meat strip, providing accurate data for freshness analysis and enabling rapid detection, thus improving detection efficiency.

[0069] Specifically, the test platform is also equipped with a robotic arm 4 connected to the sampler 6 for adjusting the sampling rate and height of the sampler 6.

[0070] Specifically, a conveyor belt 2 for conveying fresh meat 7 to the test platform 1 is also installed above the test platform 1.

[0071] Specifically, the freshness analysis module is connected to the fresh meat image acquisition unit 8 and the robotic arm 4 respectively, and is used to acquire the surface image of the fresh meat 7 when the fresh meat 7 is above the test platform 1, and to perform edge detection on the surface image of the fresh meat 7, calculate the maximum displacement of several points on the edge of the surface image of the fresh meat 7 per unit time. If the maximum displacement is greater than or equal to the preset maximum displacement, it is determined that the sampling stability does not meet the requirements, and the sampling rate of the sampler 6 is reduced.

[0072] Specifically, the sampling rate of sampler 6 decreases from the standard sampling rate.

[0073] Specifically, the decrease in the sampling rate of the sampler 6 is positively correlated with the maximum displacement.

[0074] Specifically, the fresh meat image acquisition unit 8 can be a CMOS high-speed camera, a CCD high-speed camera, or a stripe camera, wherein the preferred embodiment of the fresh meat image acquisition unit 8 is a stripe camera.

[0075] Specifically, the method for calculating the maximum displacement of fresh meat 7 in the surface image of fresh meat 7 per unit time is as follows: the fresh meat image acquisition unit 8 acquires continuous surface images of fresh meat 7, uses edge detection to segment the meat block from the background, uses the inter-frame difference method to detect the position changes of several points on the left and right edges in the surface image of fresh meat 7, and calculates the maximum displacement based on the detected position changes of fresh meat 7 per unit time.

[0076] Specifically, the maximum displacement is the maximum straight line length among the straight line lengths of several points on the left and right edges of the surface image of fresh meat 7 at the beginning of the unit time and the end of the unit time.

[0077] Specifically, when calculating the maximum displacement of fresh meat 7 in the surface image of fresh meat 7 per unit time, the unit time is 0.4s.

[0078] Specifically, the general range of the preset maximum displacement is [7mm, 8mm].

[0079] Preferably, the maximum displacement is 8 mm in the preferred embodiment.

[0080] Specifically, the standard sampling rate can be set according to the size of the robotic arm 4 and the size of the fresh meat 7. The preferred embodiment of the standard sampling rate is 0.1 m / s.

[0081] In practice, when the difference between the maximum displacement of fresh meat 7 per unit time and the preset maximum displacement is within 1 mm, the sampling rate is reduced by 0.01 m / s relative to the standard sampling rate; when the difference between the maximum displacement of fresh meat 7 per unit time and the preset maximum displacement exceeds 1 mm, the sampling rate is reduced by 0.01 m / s relative to the standard sampling rate for every 0.5 mm exceeding the preset maximum displacement. For example, if the maximum displacement of fresh meat 7 per unit time is 10 mm, the sampling rate is reduced to 0.1 m / s - 0.01 m / s - 0.01 m / s × 2 = 0.07 m / s relative to the standard sampling rate.

[0082] In practice, the system of the present invention, by setting a preset maximum displacement and robotic arm 4, addresses the issue of unstable morphology of fresh meat 7 on the testing platform 1 due to varying thicknesses, which leads to decreased detection stability. By precisely controlling the sampling rate, the uniformity and stability of the tested meat strips during sampling are improved. When the fresh meat 7 reaches the top of the testing platform 1, the robotic arm 4 can adjust the sampling rate of the sampler 6 in real time according to the maximum displacement of the fresh meat 7, reducing the problem of uneven sampling caused by the unstable morphology of the fresh meat 7 and improving the accuracy of the detection results.

[0083] Specifically, the freshness analysis module is connected to the conductivity test module to obtain the current in the conductive circuit after the tested meat strip is connected to the conductivity test component, and to calculate the conductivity of the tested meat strip. If the conductivity is greater than or equal to the preset conductivity, it is determined that the conductivity of the tested meat strip does not meet the requirements.

[0084] The conductivity of the tested meat strip is the ratio of the current in the conductive circuit to the cross-sectional area of ​​the tested meat strip parallel to the bottom surface of the sampler 6.

[0085] Specifically, the typical range for the preset conductivity is [0.5 × 10⁻⁶]. 3 μΩ -1 0.7×10 3 μΩ -1 ].

[0086] Preferably, the preferred embodiment of the preset conductivity is 0.6 × 10⁻⁶. 3 μΩ -1 .

[0087] In practice, the system of the present invention sets a preset conductivity. When the conductivity of the tested meat strip exceeds the preset value, the system determines that its conductivity does not meet the requirements, thereby effectively distinguishing stale fresh meat 7 that has produced conductive substances that cause abnormally high conductivity, thus improving the detection accuracy.

[0088] Specifically, the freshness analysis module is connected to the meat strip image acquisition unit 3 to obtain the average chromaticity of the surface color of the inspected meat strip at the end of the detection cycle. If the average chromaticity exceeds the chromaticity threshold, the surface freshness of the inspected meat strip is determined to be unsatisfactory.

[0089] Specifically, the meat strip image acquisition unit 3 can be a color measurement camera, a spectral imaging camera, or a line scan camera, wherein the preferred embodiment of the meat strip image acquisition unit 3 is a line scan camera.

[0090] Specifically, the surface color of the inspected meat strip at the end of the unit time was obtained using the CIELab color space measurement system.

[0091] Optionally, the L value of the chromaticity threshold can be selected from [38, 58].

[0092] Preferably, the preferred embodiment of the chromaticity threshold is [40, 55].

[0093] Specifically, if the average chromaticity of the surface color of the tested meat strip exceeds the L value range of the chromaticity threshold at the end of the testing cycle, the surface freshness of the tested meat strip is determined to be unacceptable.

[0094] In practice, the system described in this invention sets a color threshold. Since the difference in surface color is related to the freshness of the meat, by comparing the difference between the surface color and the color threshold, the system can more accurately determine the freshness of the meat. When the surface color of the inspected meat strip exceeds the preset threshold, the system will determine that the freshness of the meat strip does not meet the requirements, thus improving the detection accuracy.

[0095] Specifically, the freshness analysis module is connected to the conductivity test module and the meat strip image acquisition unit 3 respectively, and is used to determine that the fresh meat 7 is not fresh when the conductivity of the tested meat strip does not meet the requirements and the surface freshness does not meet the requirements.

[0096] In practice, the system of this invention detects conductivity and acquires surface images of the meat strips being tested. Because the increased moisture content in water-injected meat affects the accuracy of the conductivity testing module, the conductivity test result increases. By combining the surface image with a comprehensive assessment of the freshness of the meat strips, the accuracy of the test results is improved. During the testing process, if the conductivity of the meat strip is abnormally high, but the surface color does not exceed the threshold, the system can accurately determine that the meat strip is suspected of being water-injected, thus avoiding misjudgments caused by water injection and improving detection accuracy. This further enhances the anti-interference capability of the freshness analysis module and the accuracy of the test results.

[0097] This invention discloses a freshness monitoring method for a fresh meat freshness monitoring device, comprising:

[0098] Acquire a surface image of fresh meat 7 and calculate the maximum displacement of several points on the edge of the surface of fresh meat 7 per unit time.

[0099] The sampling rate of sampler 6 is adjusted according to the maximum displacement.

[0100] Sampler 6 is used to collect meat strips from the fresh meat 7 at the sampling rate described above.

[0101] Obtain the current in the circuit after the conductivity testing component is connected to the meat strip under test;

[0102] The conductivity of the tested meat strip is calculated based on the current.

[0103] Obtain the average chromaticity of the surface color of the inspected meat strip;

[0104] The freshness of the meat 7 is determined based on the conductivity and average chromaticity of the surface color of the tested meat strip.

[0105] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A fresh meat freshness monitoring device, characterized in that, include: Test platform; A conductivity testing module, which is connected to the testing platform, is used to test the conductivity of fresh meat. It includes a sampler for sampling fresh meat to obtain a meat strip to be tested and a conductivity testing component connected to the sampler to test the conductivity of the meat strip by connecting the meat strip to a conductive circuit. An image acquisition module is disposed above the test platform to acquire surface images of fresh meat and the meat strips under test, including a meat strip image acquisition unit disposed above the sampler to acquire surface images of the meat strips under test and a fresh meat image acquisition unit disposed on the side of the test platform away from the sampler to acquire surface images of fresh meat. The freshness analysis module is connected to the conductivity testing module and the image acquisition module respectively. It is used to determine the sampling rate of the sampler based on the maximum displacement of the fresh meat per unit time, and to determine whether the fresh meat is fresh based on the average chromaticity of the surface color of the tested meat strip and the conductivity of the fresh meat. The test platform is also equipped with a robotic arm connected to the sampler to adjust the sampling rate and height of the sampler. The freshness analysis module is connected to the fresh meat image acquisition unit and the robotic arm respectively. It is used to acquire the surface image of the fresh meat when the fresh meat is above the test platform, perform edge detection on the surface image of the fresh meat, calculate the maximum displacement of several points on the edge of the surface image of the fresh meat per unit time, and if the maximum displacement is greater than or equal to the preset maximum displacement, it is determined that the sampling stability does not meet the requirements, and the sampling rate of the sampler is reduced.

2. The fresh meat freshness monitoring device according to claim 1, characterized in that, The sampler has a three-dimensional structure as a hollow semi-cylinder with a semi-circular bottom.

3. The fresh meat freshness monitoring device according to claim 2, characterized in that, The conductivity testing component includes: An electrode assembly, disposed on the inner wall of the sampler, is used to pass an electric current through the meat strip being tested; An ammeter, connected to the electrode assembly, is used to detect the current passing through the meat strip under test.

4. The fresh meat freshness monitoring device according to claim 1, characterized in that, The decrease in the sampling rate of the sampler is positively correlated with the maximum displacement.

5. The fresh meat freshness monitoring device according to claim 4, characterized in that, The freshness analysis module is connected to the conductivity test module to obtain the current in the conductive circuit after the tested meat strip is connected to the conductivity test component, and to calculate the conductivity of the tested meat strip. If the conductivity is greater than or equal to the preset conductivity, the conductivity of the tested meat strip is determined to be unacceptable. The conductivity of the tested meat strip is the ratio of the current in the conductive circuit to the cross-sectional area of ​​the tested meat strip parallel to the bottom surface of the sampler.

6. The fresh meat freshness monitoring device according to claim 5, characterized in that, The freshness analysis module is connected to the meat strip image acquisition unit to obtain the average chromaticity of the surface color of the inspected meat strip at the end of the detection cycle. If the average chromaticity exceeds the chromaticity threshold, the surface freshness of the inspected meat strip is determined to be unsatisfactory.

7. The fresh meat freshness monitoring device according to claim 6, characterized in that, The freshness analysis module is connected to the conductivity testing module and the meat strip image acquisition unit, respectively, and is used to determine that the meat is not fresh when the conductivity of the tested meat strip does not meet the requirements and the surface freshness does not meet the requirements.

8. A method for monitoring the freshness of meat using the fresh meat freshness monitoring device according to any one of claims 1-7, characterized in that, include: Acquire a surface image of fresh meat and calculate the maximum displacement of several points on the edge of the fresh meat surface per unit time. Adjust the sampling rate of the sampler according to the maximum displacement; Use a sampler to collect meat strips for testing from the fresh meat at the sampling rate described; Obtain the current in the circuit after the conductivity testing component is connected to the meat strip under test; The conductivity of the tested meat strip is calculated based on the current. Obtain the average chromaticity of the surface color of the inspected meat strip; The freshness of the meat is determined based on the conductivity and average chromaticity of the surface color of the tested meat strips.

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