CN114047258B - Jewelry authenticity identification device and method - Google Patents
Jewelry authenticity identification device and method Download PDFInfo
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- CN114047258B CN114047258B CN202111357144.9A CN202111357144A CN114047258B CN 114047258 B CN114047258 B CN 114047258B CN 202111357144 A CN202111357144 A CN 202111357144A CN 114047258 B CN114047258 B CN 114047258B
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000004458 analytical method Methods 0.000 claims abstract description 40
- 238000005259 measurement Methods 0.000 claims abstract description 39
- 230000005284 excitation Effects 0.000 claims description 113
- 230000001133 acceleration Effects 0.000 claims description 36
- 238000001514 detection method Methods 0.000 claims description 26
- 230000003993 interaction Effects 0.000 claims description 18
- 238000004891 communication Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010437 gem Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/12—Analysing solids by measuring frequency or resonance of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
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- Length Measuring Devices By Optical Means (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention provides a jewelry authenticity identification device, which relates to the technical field of jewelry identification and comprises a first natural frequency analysis device and a second natural frequency analysis device, wherein the first natural frequency analysis device can obtain the actual measurement natural frequency of jewelry to be detected, the target jewelry is identified, the three-dimensional shape of the target jewelry is the same as that of the jewelry to be detected, the natural frequency of the target jewelry is theoretical natural frequency, and the second natural frequency analysis device can obtain theoretical natural frequency. The invention provides a jewelry authenticity identification method, which is characterized in that theoretical natural frequency and actual measurement natural frequency are compared, and the authenticity of jewelry to be detected is determined according to the comparison result. The accuracy and convenience of jewelry authenticity identification are improved.
Description
Technical Field
The invention relates to the technical field of jewelry identification, in particular to a jewelry authenticity identification device and a jewelry authenticity identification method.
Background
At present, in the market, jewellery (precious stones, jades, etc.) has extremely high value, and the attractive appearance and color of jewellery and its non-renewable nature have led to the attention of more and more consumers and businesses to the jewellery market. However, as various technologies are more mature, the phenomenon of jewelry counterfeiting is more serious, and the difficulty of jewelry identification is more and more difficult. Especially for wide consumers, the consumers are often deceived by illegal merchants due to lack of knowledge about jewelry authentication, resulting in great property loss. The existence of false jewelry not only greatly increases the purchase risk of consumers, but also severely damages market order.
Conventional jewelry authentication generally employs a manual authentication method. The authenticating person clamps jewelry with forceps in one hand and holds the light source in the other hand; or fixing and irradiating jewelry by means of a clamp capable of 360 DEG rotation and provided with a light source; then, the identification method is observed by naked eyes, the identification level of an identifier is greatly relied on, the subjective judgment of the identifier is excessively relied on, and the reliability of an identification result is low; and there is a risk of damage to jewelry due to mishandling of the authenticating person.
Disclosure of Invention
The invention aims to provide a jewelry authenticity identification device and a jewelry authenticity identification method, which are used for solving the problems existing in the prior art and improving the accuracy and convenience of jewelry authenticity identification.
In order to achieve the above object, the present invention provides the following solutions:
the invention provides a jewelry authenticity identification device, which comprises a first natural frequency analysis device and a second natural frequency analysis device, wherein the first natural frequency analysis device can obtain the actual measurement natural frequency of jewelry to be detected, the second natural frequency analysis device can obtain the theoretical natural frequency of target jewelry which is the same as the three-dimensional shape of the jewelry to be detected and has the class of jewelry identified as the class of jewelry to be detected.
Preferably, the jewelry authentication device provided by the invention further comprises a three-dimensional shape detection device and a vibration parameter detection device, wherein the three-dimensional shape detection device can obtain the three-dimensional shape of the jewelry to be detected, the vibration parameter detection device can enable the jewelry to be detected to vibrate freely and can obtain accelerations of the jewelry to be detected in multiple directions in a free vibration state, the first natural frequency analysis device can obtain the actual measurement natural frequency through the accelerations of the jewelry to be detected in multiple directions in the free vibration state, and the second natural frequency analysis device can obtain the theoretical natural frequency through the three-dimensional shape of the jewelry to be detected, the elastic modulus of the target jewelry, the density of the target jewelry and the poisson ratio of the target jewelry.
Preferably, the three-dimensional shape detection device is a three-dimensional scanning device, the vibration parameter detection device comprises an acceleration measurement device and an excitation device, the excitation device is fixedly connected with the three-dimensional scanning device, the acceleration measurement device is used for being fixedly connected with jewelry to be detected, the three-dimensional scanning device is in communication connection with the second natural frequency analysis device, the acceleration measurement device is in communication connection with the first natural frequency analysis device, the excitation device can enable jewelry to be detected to vibrate freely through knocking the jewelry to be detected, and the acceleration measurement device can measure accelerations of the jewelry to be detected in multiple directions under the free vibration state.
Preferably, the vibration excitation device comprises a vibration excitation rod and a driving device, the three-dimensional scanning device is provided with an oil supply cavity, the oil supply cavity is used for being arranged opposite to jewelry to be detected, the vibration excitation rod is sleeved in the oil supply cavity, one end of the vibration excitation rod is connected with the oil supply cavity in a sliding mode and is sealed, the other end of the vibration excitation rod is used for knocking jewelry to be detected, the driving device drives the vibration excitation rod to extend out along the central line direction of the oil supply cavity and knock jewelry to be detected by controlling oil liquid to enter the oil supply cavity, and the driving device drives the vibration excitation rod to return to the oil supply cavity along the central line direction of the oil supply cavity by controlling oil liquid to be discharged from the oil supply cavity.
Preferably, the vibration excitation device further comprises a vibration excitation head and an elastic component, the elastic component is arranged at one end of the vibration excitation rod, which is close to the jewelry to be detected, one end of the vibration excitation head is connected with one end of the elastic component, which is close to the jewelry to be detected, and the other end of the vibration excitation head is used for knocking the jewelry to be detected.
Preferably, the excitation rod is close to one end of the jewelry to be detected is provided with an air cavity, the excitation head is far away from one end of the jewelry to be detected and the air cavity is connected in a sliding manner and is sealed, compressed gas is contained in the air cavity, the compressed gas contained in the air cavity is the elastic component, the excitation device further comprises a ranging device, the ranging device is fixedly connected to one end of the excitation head, which is close to the jewelry to be detected, the excitation device is vertically arranged, and the ranging device can measure the distance between the end point of the lowest end of the excitation head and the jewelry to be detected.
Preferably, the excitation rod comprises a first excitation rod and a second excitation rod, the first excitation rod is sleeved in the oil supply cavity, one end of the first excitation rod is in sliding connection with the oil supply cavity and is sealed, the first excitation rod is provided with a first through hole, the second excitation rod is sleeved in the first excitation rod, one end of the second excitation rod is in sliding connection with the first through hole and is sealed, the other end of the second excitation rod is provided with the air cavity, the first through hole is communicated with the oil supply cavity, the first excitation rod can stretch out or return to the oil supply cavity under the driving of the driving device, and the second excitation rod can stretch out or return to the first excitation rod under the driving of the driving device and can perform stretching action before the second excitation rod.
Preferably, the jewelry authenticity identifying device further comprises a controller and a man-machine interaction device, wherein the controller is in communication connection with the man-machine interaction device, the distance measuring device, the three-dimensional scanning device and the first natural frequency analysis device, the first natural frequency analysis device is in communication connection with the acceleration measuring device, the controller can control the driving device to supply or stop supplying oil to the oil supply cavity through the distance between the end point of the lowest end of the exciting head measured by the distance measuring device and the jewelry to be detected, the controller can control the driving device to discharge oil in the oil supply cavity, the controller can store the three-dimensional shape of the jewelry to be detected obtained by the three-dimensional scanning device and display the three-dimensional shape of the jewelry to be detected through the man-machine interaction device, the controller can control the jewelry to be detected through the man-machine interaction device by comparing the difference value between the natural frequency and the theoretical natural frequency with the maximum error value, and the controller can truly display the information to be detected through the man-machine interaction device.
The invention also provides a jewelry authenticity identification method, which is characterized in that: the method comprises the following steps:
s1, obtaining the measured natural frequency of jewelry to be detected;
s2, obtaining a theoretical natural frequency of the target jewelry;
s3, calculating a difference value between the actual measurement natural frequency and the theoretical natural frequency, and obtaining a maximum error value between the actual measurement natural frequency and the theoretical natural frequency; comparing the difference value between the actual measured natural frequency and the theoretical natural frequency with a maximum error value, when the difference value between the actual measured natural frequency and the theoretical natural frequency is smaller than or equal to the maximum error value, identifying the jewelry to be detected as a genuine product, and when the difference value between the actual measured natural frequency and the theoretical natural frequency is larger than the maximum error value, identifying the jewelry to be detected as a counterfeit product;
the target jewelry is jewelry which has the same three-dimensional shape as the jewelry to be detected and the class is the class identified as the jewelry to be detected.
Preferably, S1 comprises: obtaining the three-dimensional shape of the jewelry to be detected, the elastic modulus of the target jewelry, the density of the target jewelry and the poisson ratio of the target jewelry, and obtaining the theoretical natural frequency through the three-dimensional shape of the jewelry to be detected, the elastic modulus of the target jewelry, the density of the target jewelry and the poisson ratio of the target jewelry;
s2 comprises the following steps: acquiring acceleration of the jewelry to be detected in multiple directions in a free vibration state, and acquiring the actual measurement natural frequency through the acceleration of the jewelry to be detected in multiple directions;
compared with the prior art, the invention has the following technical effects:
according to the jewelry authenticity identification device and method, the difference value between the actual measured natural frequency and the theoretical natural frequency is compared with the maximum error value, when the difference value between the actual measured natural frequency and the theoretical natural frequency is smaller than or equal to the maximum error value, the jewelry to be detected is identified as a genuine product, and when the difference value between the actual measured natural frequency and the theoretical natural frequency is larger than the maximum error value, the jewelry to be detected is identified as a counterfeit product. Compared with the identification by artificial vision, the accuracy and convenience of jewelry authenticity identification are greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of the structure of the detection device in embodiment 1;
fig. 2 is a schematic structural diagram of the excitation device in embodiment 1 (the excitation rod is located in the oil supply chamber);
fig. 3 is a schematic structural view of the excitation device in embodiment 1 (only the first excitation rod is extended);
fig. 4 is a schematic structural view of the excitation device in embodiment 1 (the first excitation rod and the second excitation rod are both extended);
fig. 5 is a schematic structural diagram of the controller in embodiment 1 (the first natural frequency analysis device is integrated in the controller);
fig. 6 is a schematic structural diagram of a second natural frequency analyzing device in the present embodiment 1;
fig. 7 is a schematic structural diagram of a man-machine interaction device in this embodiment 1;
in the figure: 100-jewelry authenticity identification device, 1-first natural frequency analysis device, 2-second natural frequency analysis device, 3-three-dimensional shape detection device, 4-three-dimensional scanning device, 5-vibration parameter detection device, 501-acceleration measurement device, 502-excitation device, 6-excitation rod, 7-oil supply cavity, 8-excitation head, 9-elastic component, 10-air cavity, 11-compressed gas, 12-distance measuring device, 13-first excitation rod, 14-second excitation rod, 15-signal acquisition analyzer, 16-controller and 17-man-machine interaction device.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a jewelry authenticity identification device and a jewelry authenticity identification method, which are used for solving the problems existing in the prior art and improving the accuracy and convenience of jewelry authenticity identification.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1
As shown in fig. 1 to 4, the jewelry authentication apparatus 100 provided in this embodiment includes a first natural frequency analysis apparatus 1 and a second natural frequency analysis apparatus 2, the first natural frequency analysis apparatus 1 being capable of obtaining an actual measurement natural frequency of jewelry to be detected, the second natural frequency analysis apparatus 2 being capable of obtaining a theoretical natural frequency of target jewelry which is the same three-dimensional shape as jewelry to be detected and which is classified as a class of jewelry to be detected. Three-dimensional shape is a three-dimensional shape. And comparing the difference value between the actual measurement natural frequency and the theoretical natural frequency with the maximum error value, when the difference value between the actual measurement natural frequency and the theoretical natural frequency is smaller than or equal to the maximum error value, identifying jewelry to be detected as a genuine product, and when the difference value between the actual measurement natural frequency and the theoretical natural frequency is larger than the maximum error value, identifying jewelry to be detected as a counterfeit product. Compared with the identification by artificial vision, the accuracy and convenience of jewelry authenticity identification are greatly improved.
The jewelry authentication apparatus 100 provided in this embodiment further includes a three-dimensional shape detection apparatus 3 and a vibration parameter detection apparatus 5, the three-dimensional shape detection apparatus 3 being capable of obtaining a three-dimensional shape of jewelry to be detected, the vibration parameter detection apparatus 5 being capable of freely vibrating the jewelry to be detected and obtaining accelerations of the jewelry to be detected in a plurality of directions in a free vibration state, the first natural frequency analysis apparatus 1 being capable of obtaining an actual measurement natural frequency from the accelerations of the jewelry to be detected in a plurality of directions in a free vibration state, the second natural frequency analysis apparatus 2 being capable of obtaining a theoretical natural frequency from the three-dimensional shape of the jewelry to be detected, an elastic modulus of a target jewelry, a density of the target jewelry and a poisson ratio of the target jewelry. The elastic modulus of the target jewelry, the density of the target jewelry and the poisson ratio of the target jewelry are intrinsic parameters of the material, and can be directly obtained through inquiry.
The three-dimensional shape detection device 3 is a three-dimensional scanning device 4, the vibration parameter detection device 5 is an acceleration measurement device 501 and an excitation device 502, the three-dimensional scanning device 4 is preferably a three-dimensional scanner, the acceleration measurement device 501 is preferably an acceleration sensor, the acceleration along three directions of an X axis, a Y axis and a Z axis under a standard coordinate system can be detected, the excitation device 502 is fixedly connected with the three-dimensional scanning device 4, the acceleration measurement device 501 is fixedly connected with jewelry to be detected, the three-dimensional scanning device 4 is in communication connection with the second natural frequency analysis device 2, the acceleration measurement device 501 is in communication connection with the first natural frequency analysis device 1, the three-dimensional scanning device 4 can obtain the three-dimensional shape of jewelry to be detected, the excitation device 502 can enable jewelry to be detected to vibrate freely by knocking the jewelry to be detected, and the acceleration measurement device 501 can measure the accelerations along three directions of the jewelry to be detected under the free vibration state, preferably the acceleration along the three directions of the X axis, the Y axis and the Z axis under the standard coordinate system.
The excitation device 502 comprises an excitation rod 6 and a driving device, the three-dimensional scanning device 4 is provided with an oil supply cavity 7, the oil supply cavity 7 is used for being arranged opposite to jewelry to be detected, preferably, the oil supply cavity 7 is vertically arranged right above the jewelry to be detected, the excitation rod 6 is sleeved in the oil supply cavity 7, one end of the excitation rod 6 is in sliding connection with the oil supply cavity 7 and is sealed, the other end of the excitation rod 6 is used for knocking jewelry to be detected, the driving device drives the excitation rod 6 to extend out along the central line direction of the oil supply cavity 7 and knock jewelry to be detected by controlling oil to enter the oil supply cavity 7, and the driving device drives the excitation rod 6 to return to the oil supply cavity 7 along the central line direction of the oil supply cavity 7 by controlling oil to be discharged from the oil supply cavity 7. The excitation device 502 is integrated on the three-dimensional scanning device 4, so that jewelry to be detected is prevented from moving for many times, the application is facilitated, and the detection efficiency is improved.
The excitation device 502 further comprises an excitation head 8 and an elastic component 9, wherein the elastic component 9 is arranged at one end of the excitation rod 6, which is close to jewelry to be detected, one end of the excitation head 8 is connected with one end of the elastic component 9, which is close to jewelry to be detected, and the other end of the excitation head 8 is used for knocking jewelry to be detected. When the exciting force is large, the elastic component 9 can buffer the exciting head 8, so that the jewelry to be detected is effectively prevented from being damaged.
The excitation rod 6 is close to the one end of waiting to detect jewelry and is equipped with air cavity 10, and the excitation head 8 is kept away from the one end of waiting to detect jewelry and air cavity 10 sliding connection and sealed, is used for splendid attire compressed gas 11 in the air cavity 10, and splendid attire compressed gas 11 in air cavity 10 is elastomeric element 9, and excitation device 502 still includes rangefinder 12, and rangefinder 12 fixed connection is close to the one end of waiting to detect jewelry in excitation head 8, and excitation device 502 vertical setting, rangefinder 12 can measure the extreme point of the lower extreme of excitation head 8 and wait to detect the distance between the jewelry. When the exciting force is large, the exciting head 8 slides upwards along the air cavity 10, the compressed air 11 is compressed, and the acting force of the compressed air 11 on the exciting head 8 is increased along with the increase of the upward moving distance of the exciting head 8, so that the vibration damping device has a better buffering effect.
The exciting rod 6 comprises a first exciting rod 13 and a second exciting rod 14, the first exciting rod 13 is sleeved in the oil supply cavity 7, one end of the first exciting rod 13 is slidably connected with the oil supply cavity 7 and is sealed, the first exciting rod 13 is provided with a first through hole, the second exciting rod 14 is sleeved in the first exciting rod 13, one end of the second exciting rod 14 is slidably connected with the first through hole and is sealed, the other end of the second exciting rod 14 is provided with an air cavity 10, the first through hole is communicated with the oil supply cavity 7, the first exciting rod 13 can stretch out or return to the oil supply cavity 7 under the driving of the driving device, the second exciting rod 14 can stretch out or return to the first exciting rod 13 under the driving of the driving device, and the first exciting rod 13 can execute stretching motion before the second exciting rod 14. Preferably, the second excitation rod 14 has a second through hole, the second through hole is communicated with the first through hole and the oil supply cavity 7, the upper end of the first excitation rod 13 has a first contact surface, the upper end of the second excitation rod 14 has a second contact surface, the first contact surface and the second contact surface are used for contacting with oil, and the area of the first contact surface is larger than that of the second contact surface, so that the first excitation rod 13 can execute the extending action before the second excitation rod 14. Simple structure, convenient application.
The jewelry authentication device 100 provided in this embodiment further includes a controller 16 and a man-machine interaction device 17, where the controller 16 is communicatively connected with the man-machine interaction device 17, the ranging device 12, the three-dimensional scanning device 4 and the first natural frequency analysis device 1, the first natural frequency analysis device 1 is communicatively connected with the acceleration measurement device 501, the controller 16 can control the driving device to supply oil into the oil supply cavity 7 or stop supplying oil through the distance between the end point of the lowest end of the excitation head 8 measured by the ranging device 12 and the jewelry to be detected, the controller 16 can control the driving device to discharge oil in the oil supply cavity 7, preferably, the controller 16 controls the driving device to supply oil into the oil supply cavity 7, and the first excitation rod 13 stretches out rapidly under the action of the oil; then, the second excitation rod 14 stretches out under the action of oil, and when the distance between the lowest point of the excitation head 8 and jewelry to be detected is 5mm, the controller 16 controls the driving device to stop oil supply, and the second excitation rod 14 stops acting; after the controller 16 sends out the excitation signal, the second excitation rod 14 stretches out at a specific acceleration and knocks on the natural jewelry to be detected; after the knocking is finished, the second excitation rod 14 and the first excitation rod 13 immediately return to the oil supply cavity 7, and one-time excitation is finished. The excitation rod 6 is arranged in a mode of combining the first excitation rod 13 and the second excitation rod 14, and the length of the first excitation rod 13 can be set to be smaller than the distance between the upper end of the three-dimensional scanning device 4 and the natural jewelry to be detected, so that the first excitation rod 13 can be rapidly stretched out without damaging the natural jewelry to be detected, and the detection efficiency can be improved. The controller 16 can store the three-dimensional shape of the jewelry to be detected obtained by the three-dimensional scanning device 4 and display the three-dimensional shape of the jewelry to be detected through the man-machine interaction device 17, and the controller can display the actually measured natural frequency and the theoretical natural frequency through the man-machine interaction device. The controller 16 can judge whether the jewelry to be detected is genuine or fake by comparing the difference between the actually measured natural frequency and the theoretical natural frequency with the maximum error value, and the controller 16 can display the genuine or fake information of the jewelry to be detected through the man-machine interaction device 17. The detection process can be intuitively viewed and the detection result can be obtained. Preferably, the second natural frequency analyzing apparatus 2 is integrated in the controller 16, i.e., the controller 16 can obtain the theoretical natural frequency by detecting the three-dimensional shape of the jewelry, the elastic modulus of the target jewelry, the density of the target jewelry, and the poisson ratio of the target jewelry. Preferably, the controller 16 obtains the theoretical natural frequency by means of finite element analysis, preferably using hyperworks commercial software, and obtains the natural frequency of the jewelry to be detected by means of finite element analysis through the three-dimensional shape of the jewelry to be detected, the elastic modulus of the target jewelry, the density of the target jewelry and the poisson ratio of the target jewelry, which are not described in detail herein. The first natural frequency analyzing device 1 is a signal collecting analyzer, and the signal collecting analyzer 15 is a prior art, which is not described herein. The controller 16 can store the measured natural frequency obtained by the signal acquisition analyzer 15 and display the measured natural frequency through the man-machine interaction device 17,
example 2
The jewelry authenticity identification method provided by the embodiment comprises the following steps:
s1, obtaining the measured natural frequency of jewelry to be detected;
s2, obtaining a theoretical natural frequency of the target jewelry;
s3, calculating a difference value between the actual measurement natural frequency and the theoretical natural frequency; obtaining a maximum error value between the actual measured natural frequency and the theoretical natural frequency; preferably, the maximum error value is determined to be less than or equal to 5% by evaluating the error caused by equipment precision, finite element software modeling mode and the like.
Comparing the difference value between the actual measurement natural frequency and the theoretical natural frequency with the maximum error value, when the difference value between the actual measurement natural frequency and the theoretical natural frequency is smaller than or equal to the maximum error value, identifying jewelry to be detected as a genuine product, and when the difference value between the actual measurement natural frequency and the theoretical natural frequency is larger than the maximum error value, identifying jewelry to be detected as a counterfeit product;
the target jewelry is jewelry that has the same three-dimensional shape as the jewelry to be inspected and the class is the class to which the jewelry to be inspected is identified.
S1 comprises the following steps: obtaining the three-dimensional shape of the jewelry to be detected, the elastic modulus of the target jewelry, the density of the target jewelry and the poisson ratio of the target jewelry, and obtaining the theoretical natural frequency through the three-dimensional shape of the jewelry to be detected, the elastic modulus of the target jewelry, the density of the target jewelry and the poisson ratio of the target jewelry;
s2 comprises the following steps: the method comprises the steps of obtaining acceleration of jewelry to be detected in multiple directions in a free vibration state, and obtaining actual measurement natural frequency through the acceleration of the jewelry to be detected in multiple directions.
Step S1 further includes: obtaining the natural frequency of the target jewelry according to the three-dimensional shape of the jewelry to be detected, the elastic modulus of the target jewelry, the density of the target jewelry and the Poisson's ratio of the target jewelry by utilizing a finite element analysis method;
step S2 further includes: knocking the jewelry to be detected at a set speed and acceleration at a position 5mm away from the jewelry to be detected so as to enable the jewelry to be detected to vibrate freely;
further comprises:
displaying the actual measured natural frequency and the theoretical natural frequency;
and displaying the identification result of the jewelry to be detected.
Compared with the identification by artificial vision, the accuracy and convenience of jewelry authenticity identification are greatly improved.
The jewelry in the invention is broad jewelry, including gold, silver and natural materials (minerals, rocks, organisms, etc.), jewelry, artware or other treasures with certain value.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (10)
1. A jewelry authentication device, characterized in that: the jewelry detection system comprises a first natural frequency analysis device and a second natural frequency analysis device, wherein the first natural frequency analysis device can obtain the actual measurement natural frequency of jewelry to be detected, the second natural frequency analysis device can obtain the theoretical natural frequency of target jewelry which is the same as the three-dimensional shape of the jewelry to be detected and has the same class as the class identified by the jewelry to be detected;
the three-dimensional shape detection device and the vibration parameter detection device are also included, the vibration parameter detection device comprises an acceleration measurement device and an excitation device, the excitation device is fixedly connected with the three-dimensional scanning device, the acceleration measurement device is fixedly connected with the jewelry to be detected, and the acceleration measurement device is in communication connection with the first natural frequency analysis device;
the excitation device comprises an excitation rod and a driving device, the three-dimensional scanning device is provided with an oil supply cavity, the excitation rod is sleeved in the oil supply cavity, one end of the excitation rod is connected with the oil supply cavity in a sliding mode and is sealed, the other end of the excitation rod is used for knocking the jewelry to be detected, and the driving device drives the excitation rod to extend out along the central line direction of the oil supply cavity and knock the jewelry to be detected by controlling oil to enter the oil supply cavity; the excitation rod can be completely contracted into the oil supply cavity of the three-dimensional scanning device;
the vibration excitation device further comprises a distance measuring device, the distance measuring device is fixedly connected to one end, close to the jewelry to be detected, of the vibration excitation head of the vibration excitation device, the vibration excitation device is vertically arranged, and the distance measuring device can measure the distance between the endpoint of the bottommost end of the vibration excitation head and the jewelry to be detected;
the vibration rod comprises a first vibration rod and a second vibration rod, the first vibration rod is sleeved in the oil supply cavity, one end of the first vibration rod is in sliding connection with the oil supply cavity and is sealed, the first vibration rod is provided with a first through hole, the second vibration rod is sleeved in the first vibration rod, one end of the second vibration rod is in sliding connection with the first through hole and is sealed, the first through hole is communicated with the oil supply cavity, the first vibration rod can stretch out or return to the oil supply cavity under the driving of the driving device, the second vibration rod can stretch out or return to the first vibration rod under the driving of the driving device, and the first vibration rod can perform stretching action before the second vibration rod;
the second excitation rod is provided with a second through hole, the second through hole is communicated with the first through hole and the oil supply cavity, the upper end of the first excitation rod is provided with a first contact surface, the upper end of the second excitation rod is provided with a second contact surface, the first contact surface and the second contact surface are used for being in contact with oil liquid, and the area of the first contact surface is larger than that of the second contact surface.
2. The jewelry authentication apparatus according to claim 1, wherein: the three-dimensional shape detection device can obtain the three-dimensional shape of the jewelry to be detected, the vibration parameter detection device can enable the jewelry to be detected to vibrate freely and can obtain accelerations of the jewelry to be detected in multiple directions in a free vibration state, the first natural frequency analysis device can obtain the actual measurement natural frequency through the accelerations of the jewelry to be detected in multiple directions in the free vibration state, and the second natural frequency analysis device can obtain the theoretical natural frequency through the three-dimensional shape of the jewelry to be detected, the elastic modulus of the target jewelry, the density of the target jewelry and the poisson ratio of the target jewelry.
3. The jewelry authentication apparatus according to claim 2, wherein: the three-dimensional shape detection device is a three-dimensional scanning device, the three-dimensional scanning device is in communication connection with the second natural frequency analysis device, the excitation device can enable the jewelry to be detected to vibrate freely through knocking the jewelry to be detected, and the acceleration measurement device can measure accelerations of the jewelry to be detected in multiple directions under the free vibration state.
4. A jewelry authentication apparatus according to claim 3, wherein: the oil supply cavity is used for being arranged opposite to the jewelry to be detected, and the driving device drives the excitation rod to return to the oil supply cavity along the central line direction of the oil supply cavity by controlling the oil to be discharged from the oil supply cavity.
5. The jewelry authentication apparatus of claim 4, wherein: the vibration excitation device further comprises a vibration excitation head and an elastic component, wherein the elastic component is arranged at one end of the vibration excitation rod, which is close to the jewelry to be detected, one end of the vibration excitation head is connected with one end of the elastic component, which is close to the jewelry to be detected, and the other end of the vibration excitation head is used for knocking the jewelry to be detected.
6. The jewelry authentication apparatus according to claim 5, wherein: the excitation rod is close to one end of the jewelry to be detected, one end of the excitation head, which is far away from the jewelry to be detected, is slidably connected with the air cavity and is sealed, compressed gas is contained in the air cavity, and the compressed gas contained in the air cavity is the elastic component.
7. The jewelry authentication apparatus according to claim 6, wherein: the other end of the second excitation rod is provided with the air cavity.
8. The jewelry authentication apparatus according to claim 7, wherein: the device also comprises a controller and a man-machine interaction device, wherein the controller is in communication connection with the man-machine interaction device, the distance measuring device, the three-dimensional scanning device and the first natural frequency analysis device, the first natural frequency analysis device is in communication connection with the acceleration measuring device, the controller can control the driving device to supply or stop supplying oil to the oil supply cavity through the distance between the end point of the lowest end of the exciting head measured by the distance measuring device and the jewelry to be detected, the controller can control the driving device to discharge the oil in the oil supply cavity, the controller can store the three-dimensional shape of the jewelry to be detected, which is obtained by the three-dimensional scanning device, and display the three-dimensional shape of the jewelry to be detected through the man-machine interaction device, the controller can display the actual measurement natural frequency and the theoretical natural frequency through the man-machine interaction device, the controller can judge the authenticity of the jewelry to be detected by comparing the difference value between the actual measurement natural frequency and the theoretical natural frequency with the maximum error value, and the controller can display the authenticity information of the jewelry to be detected through the man-machine interaction device.
9. A jewelry authentication method based on the jewelry authentication apparatus according to any one of claims 1 to 8, characterized in that: the method comprises the following steps:
s1, obtaining the measured natural frequency of jewelry to be detected;
s2, obtaining a theoretical natural frequency of the target jewelry;
s3, calculating a difference value between the actual measurement natural frequency and the theoretical natural frequency, and obtaining a maximum error value between the actual measurement natural frequency and the theoretical natural frequency; comparing the difference value between the actual measured natural frequency and the theoretical natural frequency with a maximum error value, when the difference value between the actual measured natural frequency and the theoretical natural frequency is smaller than or equal to the maximum error value, identifying the jewelry to be detected as a genuine product, and when the difference value between the actual measured natural frequency and the theoretical natural frequency is larger than the maximum error value, identifying the jewelry to be detected as a counterfeit product;
the target jewelry is jewelry which has the same three-dimensional shape as the jewelry to be detected and the class is the class identified as the jewelry to be detected.
10. The jewelry authentication method according to claim 9, wherein:
s1 comprises the following steps: acquiring acceleration of the jewelry to be detected in multiple directions in a free vibration state, and acquiring the actual measurement natural frequency through the acceleration of the jewelry to be detected in multiple directions;
s2 comprises the following steps: obtaining the three-dimensional shape of the jewelry to be detected, the elastic modulus of the target jewelry, the density of the target jewelry and the poisson ratio of the target jewelry, and obtaining the theoretical natural frequency through the three-dimensional shape of the jewelry to be detected, the elastic modulus of the target jewelry, the density of the target jewelry and the poisson ratio of the target jewelry.
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