CN111024819A - Jewelry and jewelry acoustic resonance spectrum imitation method - Google Patents
Jewelry and jewelry acoustic resonance spectrum imitation method Download PDFInfo
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- CN111024819A CN111024819A CN201911364291.1A CN201911364291A CN111024819A CN 111024819 A CN111024819 A CN 111024819A CN 201911364291 A CN201911364291 A CN 201911364291A CN 111024819 A CN111024819 A CN 111024819A
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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
- G01N29/045—Analysing solids by imparting shocks to the workpiece and detecting the vibrations or the acoustic waves caused by the shocks
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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
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/4409—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison
- G01N29/4427—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison with stored values, e.g. threshold values
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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
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/48—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by amplitude comparison
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Abstract
The invention provides an acoustic resonance spectrum anti-counterfeiting method for jewelry and jewelry, which is used for measurement analysis and anti-counterfeiting identification of the jewelry and the jewelry. The resonance frequency spectrum of the measured jewelry and the measured jewelry is obtained by constructing an acoustic resonance spectrum measuring system, exciting the resonance of the measured jewelry and performing frequency sweep measurement. Extracting the resonance frequency corresponding to the acoustic co-spectral peak of the jewelry and jewelry to be detected in the resonance spectrum, and analyzing the spectral line width of each resonance spectral peak to obtain the corresponding quality factor. Comparing the resonance spectral line, the resonance frequency and the quality factor obtained by analysis with standard data stored in a database to obtain a difference, and judging whether the jewelry and the jewelry to be detected are damaged or fake or not according to the obtained difference. The method solves the difficulties of rapid identification of the original products, prevention of damage, bag adjustment and the like in the processes of jewelry and jewelry preservation, transportation, transaction, return and exchange and the like, and overcomes the defects of low detection accuracy, complex operation, expensive equipment and the like in the existing jewelry and jewelry detection method.
Description
Technical Field
The invention belongs to the field of acoustic detection, relates to a jewelry and jewelry acoustic resonance spectrum imitation method, and particularly relates to a jewelry and jewelry resonance spectrum measuring and detecting, identifying and identifying method by an acoustic resonance spectrum method.
Background
Because of the huge benefit space, a large amount of counterfeit and inferior jewelry flow into the market, and a nondestructive, rapid, accurate and portable jewelry measurement analysis and anti-counterfeiting identification technology is urgently needed.
The main jewelry and jewelry detection and identification technologies at present comprise: analysis techniques such as X-ray diffraction, electron probe, infrared absorption spectrum, Raman spectrum, and scanning electron microscope. The X-ray diffraction technology can determine the type of jade, and distinguishing crystalline and amorphous gem materials is an effective means, but due to the existence of radioactivity, the use condition and the application scene are limited. The technologies of an electronic probe, an infrared absorption spectrum, a Raman spectrum and a scanning electron microscope can carry out micro-scale component analysis on a sample, can identify true and false gemstones and artificial gemstones, but are lack of detection on the macroscopic characteristics of jewelries and jewelries, and cannot be used for flaw detection of the jewelries and the jewelries;
in recent years, due to the non-destructive and non-radiative properties of acoustic resonance spectroscopy, research and clinical applications related to the acoustic resonance spectroscopy are receiving wide attention. When the frequency of the sound wave is equal to the natural frequency of the test piece when the sound wave propagates in the test piece, resonance is caused in the test piece, and the frequency of the sound signal corresponds to the natural frequency of the test piece, namely the resonance frequency. The method of inspecting a test piece by detecting the natural frequency of the test piece and its associated resonance characteristics using the resonance frequency of the acoustic spectrum is called an acoustic resonance method, and is often called an ultrasonic resonance spectroscopy method when the resonance frequency measured in the test piece is in an ultrasonic frequency band at 20kHz or more.
The spectral peak in the acoustic resonance frequency spectrum and the width of the spectral peak (described by a common quality factor Q) reflect the physical properties of the measured object, and the resonance frequency spectrums of the objects with different materials, shapes, sizes and structures are greatly different, so that the acoustic resonance frequency spectrum can be used as a method for identifying and identifying the authenticity and damage of jewelry and jewelry.
Disclosure of Invention
In order to solve the problems, the invention adopts the following technical scheme:
the invention provides a jewelry and jewelry acoustic resonance spectrum anti-counterfeiting and identification method, which is used for measuring analysis and anti-counterfeiting identification of the jewelry and is characterized by comprising the following steps:
step S1, an acoustic resonance spectrum measuring system comprising an acoustic emission/receiving probe, an amplifier, a spectrum analyzer and a computer is set up, the spectrum scanning range of the spectrum analyzer is adjusted, the spectrum bandwidth is enabled to comprise the resonance frequency of the jewelry and jewelry to be measured, and the frequency sweeping sampling point number and the data sampling precision of the spectrum analyzer are set;
step S2, generating acoustic vibration by using an acoustic emission/receiving probe, exciting the resonance of the measured jewelry and the jewelry, receiving a resonant acoustic signal, amplifying the acoustic signal by using an amplifier, and measuring the amplified acoustic signal by using a frequency spectrum analyzer in a frequency sweep mode, thereby obtaining the resonance frequency spectrum of the measured jewelry and the jewelry;
step S3, extracting the resonance frequency corresponding to the sound common spectrum peak of the jewelry and jewelry to be detected in the resonance frequency spectrum, and then analyzing the spectral line width of each resonance spectrum peak to obtain the corresponding quality factor;
and step S4, comparing the resonance spectral line, the resonance frequency and the quality factor obtained by analysis with standard data stored in a database to obtain differences, and performing the anti-counterfeiting identification on the tested jewelry and jewelry according to the obtained differences.
The jewelry and jewelry acoustic resonance spectrum anti-counterfeiting method provided by the invention can also have the technical characteristics that the acoustic emission/receiving probe is a single or a plurality of discrete probes, and each probe can be used for emitting vibration excitation and receiving a vibration signal.
The jewelry and jewelry acoustic resonance spectrum anti-counterfeiting method provided by the invention can also have the technical characteristics that the frequency spectrum comprises resonance frequency caused by mechanical vibration in all samples above 0Hz, and the set frequency spectrum bandwidth selects and comprises a resonance peak of a tested sample.
The jewelry and ornament sound resonance spectrum anti-counterfeiting method provided by the invention can also have the technical characteristics that the measured jewelry and ornament comprise solid materials which are made of metal, alloy, aggregate, tooth, shell, pearl, amber, fossil, ore, plastic, glass, gem and wood, and the jewelry and ornament which are formed by combining and embedding the solid materials.
The jewelry and jewelry acoustic resonance spectrum anti-counterfeiting method provided by the invention can also have the technical characteristics that the step S2 specifically comprises the following steps:
the acoustic vibration is utilized to excite the tested jewelry and jewelry to freely resonate, and one or more frequency sweep measurements are carried out to obtain the resonance frequency spectrum of the tested jewelry and jewelry.
And when the same measuring position and angle of the measured jewelry and the jewelry are measured for multiple times and the placing positions and angles of the measured jewelry and the jewelry are changed, multiple groups of resonance spectral lines with different amplitudes and phases are obtained.
The jewelry and jewelry acoustic resonance spectrum anti-counterfeiting method provided by the invention can also have the technical characteristics that the step S3 specifically comprises the following steps:
extracting the resonance frequency [ f ] corresponding to the acoustic co-spectral peak of the jewelry and the jewelry to be detected1,f2,…fn]Analyzing and calculating to obtain quality factor [ Q ] corresponding to the spectral line width at the resonance spectrum peak1,Q2,…Qn]：
Wherein, BW0.7Indicating a drop in amplitude intensity to a peak
The spectral bandwidth of time.
The jewelry and jewelry acoustic resonance spectrum anti-counterfeiting method provided by the invention can also have the technical characteristics that the step S4 specifically comprises the following steps:
comparing the quality factors obtained by analysis with standard resonance spectrum line data, analyzing parameters such as resonance spectrum lines, resonance frequencies and quality factors of the measured jewelry and jewelry according to the number of resonance spectrum peaks, the offset of center frequency of the spectrum peaks and the change of the quality factors of the various spectrum peaks, and judging whether the parameters are consistent with the standard data in a database or not, or analyzing whether the resonance parameters of the measured jewelry and the measured jewelry, including the resonance spectrum lines, the resonance frequencies and the quality factors, are consistent with resonance parameter information obtained by measurement or theoretical calculation of a given standard component or not.
If the measured jewelry and the jewelry are consistent, the measured jewelry and the jewelry are judged to be genuine and not damaged.
If not, the detected jewelry and the jewelry are judged to be damaged or fake.
The jewelry and jewelry acoustic resonance spectrum anti-counterfeiting method provided by the invention can also have the technical characteristics that when the resonance parameters of the measured jewelry and jewelry are inconsistent with the resonance parameter information obtained by a given standard component through measurement or theoretical calculation:
if the resonance spectrum peak has deviation, spectrum peak loss or new resonance spectrum peak, the detected jewelry and jewelry have deformation or crack damage.
And if the resonance spectrum peak is obviously different from the genuine article data, judging that the jewelry to be detected and the jewelry are fake articles with different materials or shapes.
Action and Effect of the invention
The invention provides a jewelry and jewelry acoustic resonance spectrum imitation method, provides an acoustic resonance spectrum measurement, analysis and identification method aiming at imitation of jewelry and jewelry, overcomes the defects of low detection accuracy, complex operation, expensive equipment and the like in the existing jewelry detection method, relates to a jewelry and jewelry original product identification method, and is used for solving the difficulties of fast identification of original products and prevention of damage, package adjustment and the like in the processes of jewelry and jewelry storage, transportation, transaction, goods return and the like.
Drawings
FIG. 1 is a flow chart of the operation of the present invention;
FIG. 2 is a graph showing resonance lines measured for sample 1 and sample 2 in an example of the present invention, in which the solid line is the resonance line of sample 1 and the broken line is the resonance line of sample 2;
FIG. 3 is a graph showing two resonance lines of the measurement sample 2 in the example of the present invention, in which the solid line shows the resonance line of the first measurement and the broken line shows the resonance line of the second measurement;
FIG. 4 is a graph showing resonance lines measured for sample 3 and sample 4 in an example of the present invention, in which the solid line is the resonance line of sample 3 and the broken line is the resonance line of sample 4;
FIG. 5 is a graph of two resonance lines of the measured sample 4 in an example of the present invention, in which the solid line is the resonance line of the first measurement and the broken line is the resonance line of the second measurement;
FIG. 6 is the resonance lines measured twice after combining sample 1 and sample 3 in the example of the present invention, in which the solid line is the resonance line measured for the first time and the broken line is the resonance line measured for the second time;
FIG. 7 is a graph showing the resonance line of the measured sample 1 and the resonance line of the combined sample 1 and sample 3 in the example of the present invention, in which the solid line is the measured resonance line of the sample 1 and the broken line is the measured resonance line of the sample 1 and sample 3;
fig. 8 is the resonance lines before and after deformation of sample 2 in the example of the present invention, in which the solid line is the resonance line before deformation and the broken line is the resonance line after deformation.
Detailed Description
The following description of the embodiments of the present invention is provided in connection with the accompanying drawings and the specific examples.
FIG. 1 is a flow chart of the operation of the present invention.
As shown in fig. 1, the embodiment provides an acoustic resonance spectrum anti-counterfeiting method for jewelry and jewelry, which specifically comprises the following steps:
and step S1, constructing an acoustic resonance spectrum measuring system comprising an acoustic emission/receiving probe, an amplifier, a spectrum analyzer and a computer, adjusting the spectrum scanning range of the spectrum analyzer, enabling the spectrum bandwidth to comprise one or more frequencies of the jewelry and jewelries to be measured, and setting the frequency sweeping sampling point number and data sampling precision of the spectrum analyzer.
In this embodiment, when the resonance spectrum is measured, the number of sampling points of the spectrum analyzer is 6401, the horizontal axis is frequency, and the vertical axis is a decibel representation form after intensity normalization.
And step S2, generating acoustic vibration by using the acoustic emission/receiving probe, exciting the tested jewelry and jewelry to resonate, receiving a resonant acoustic signal, amplifying the acoustic signal by using an amplifier, and measuring the amplified acoustic signal by using a frequency spectrum analyzer in a frequency sweep mode, thereby obtaining the resonance frequency spectrum of the tested jewelry and jewelry.
And multiple groups of resonance spectral lines with different amplitudes and phases are obtained when the same measurement position is included or the placement position and the angle of the sample are changed.
And step S3, extracting the resonance frequency corresponding to the acoustic co-spectral peak of the jewelry and the jewelry to be detected, and analyzing the spectral line width at each resonance spectral peak to obtain the corresponding quality factor Q.
Extracting the resonance frequency [ f ] corresponding to the acoustic co-spectral peak of the jewelry and the jewelry to be detected1,f2,…fn]Analyzing and calculating to obtain quality factor [ Q ] corresponding to the spectral line width at the resonance spectrum peak1,Q2,…Qn]：
Wherein, BW0.7Indicating a drop in amplitude intensity to a peak
The spectral bandwidth of time.
And step S4, comparing the resonance spectral line, the resonance frequency and the quality factor obtained by analysis with the standard data to obtain a difference, and further judging whether the detected jewelry and the jewelry are damaged or fake or not according to the difference obtained by comparison.
If the measured jewelry and the jewelry are consistent, judging that the measured jewelry and the jewelry are genuine and are not damaged;
if not, judging that the jewelry and the jewelry to be detected are damaged or are fake;
if the resonance spectrum peak has deviation or spectrum peak loss or a new resonance spectrum peak appears, judging that the jewelry and the jewelry to be detected have deformation or crack damage;
and if the resonance spectrum peak is obviously different from the genuine article data, judging that the jewelry to be detected and the jewelry are fake articles with different materials or shapes.
This embodiment is totally measured 4 samples that serial number is 1 ~ 4, wherein:
sample 2 was a hollow spherical silver bead with a diameter of 7mm and a mass of 483 mg;
sample 3 was a hollow spherical agate bead with a diameter of 6mm and a mass of 323 mg;
sample 4 was a hollow spherical agate bead with a diameter of 6mm and a mass of 321 mg.
FIG. 2 is a graph showing resonance lines measured for sample 1 and sample 2 in the example of the present invention, in which the solid line is the resonance line of sample 1 and the broken line is the resonance line of sample 2.
As shown in FIG. 2, the spectrum range is 20 kHz-200 kHz, and the sample 1 and the sample 2 are silver bead ornaments with the same shape, but individual errors exist in production, and the spectral peak positions of the sample 1 and the sample 2 are basically overlapped in the spectrum.
Table 1 is a comparison of the first 20 resonance frequencies in the frequency band range of 60kHz to 200kHz for sample 1 and sample 2 in FIG. 2.
By comparison, for two silver bead samples 1 and 2 with the same material and the same shape, the average relative error of the first 20 resonance frequencies in the frequency band range of 60kHz to 200kHz is 0.327%, wherein the calculation formula of the relative error E is:
wherein f is1And f2Representing two resonance frequencies of measurement and reference.
TABLE 1
Fig. 3 is a graph showing two resonance lines of the measurement sample 2 in the example of the present invention, in which the solid line shows the resonance line of the first measurement and the broken line shows the resonance line of the second measurement.
As shown in FIG. 3, the frequency ranges from 20kHz to 200kHz, and the positions of the resonance spectrum peaks of the frequency spectrums measured twice by the sample 2 are basically overlapped from the spectrum viewpoint.
Table 2 is a comparison of the first 20 resonance frequencies in the frequency band range of 60kHz to 200kHz from the results of two measurements of sample 2 in FIG. 3.
By comparison, the results of the two measurements before and after changing the angle of arrangement of the same sample showed that the average relative error of the first 20 resonance frequencies in the frequency band of 60kHz to 200kHz was 0.087%, and the samples were considered to be the same sample.
TABLE 2
FIG. 4 is a graph showing resonance lines measured for sample 3 and sample 4 in an example of the present invention, in which the solid line is the resonance line of sample 3 and the broken line is the resonance line of sample 4.
As shown in fig. 4, the frequency range is 1kHz to 1000kHz, and the peak positions of sample 3 and sample 4 substantially coincide with each other in the spectrum.
Table 3 is a comparison of the first 20 resonance frequencies in the frequency band range of 1kHz to 1000kHz for sample 3 and sample 4 in FIG. 4.
By comparison, the two agate bead samples 3 and 4, which have the same material and the same shape, have an average relative error of 1.763% in the first 20 resonance frequencies within the frequency band range of 1kHz to 1000kHz, and can be identified as non-identical samples.
TABLE 3
Fig. 5 is a graph showing two resonance lines of the measured sample 4 in the example of the present invention, in which the solid line shows the resonance line of the first measurement and the broken line shows the resonance line of the second measurement.
As shown in FIG. 5, the frequency ranges from 1kHz to 1000kHz, and the positions of the resonance spectrum peaks of the frequency spectrums measured twice by the sample 4 are basically overlapped from the spectrum viewpoint.
Table 4 is a comparison of the first 20 resonance frequencies in the frequency band range of 1kHz to 1000kHz from the results of two measurements of sample 4 in FIG. 5.
By comparison, the results of two measurements before and after changing the angle of arrangement of the same sample showed that the average relative error of the first 20 resonance frequencies in the frequency band of 1kHz to 1000kHz was 0.405%, and the samples were considered to be the same sample.
TABLE 4
Fig. 6 is a graph showing resonance lines measured twice after sample 1 and sample 3 are bonded together in the example of the present invention, in which the solid line shows the resonance line measured for the first time, and the broken line shows the resonance line measured for the second time.
As shown in fig. 6, the frequency range was 40kHz to 200kHz, and the resonance spectrum peak positions of the two measured spectra after sample 1 and sample 3 were bonded were substantially coincident from the spectrum viewpoint.
Table 5 is a comparison of the first 20 resonance frequencies of the two measurements obtained before and after changing the measurement angle of the combined sample in which sample 1 and sample 3 in FIG. 6 are stuck together in the frequency band range of 60kHz to 200 kHz.
By comparison, the combined sample obtained by bonding sample 1 and sample 3 was found to have an average relative error of 0.118% in the first 20 resonance frequencies within the frequency band of 60kHz to 200kHz, as determined from the results of two measurements with the placement angle changed, and was considered to be the same sample.
TABLE 5
Fig. 7 is a comparison of the resonance line measured for sample 1 and the resonance line measured after sample 1 and sample 3 were bonded together in the example of the present invention, in which the solid line is the resonance line measured for sample 1 and the broken line is the resonance line measured after sample 1 and sample 3 were bonded together.
As shown in fig. 7, the frequency range was 60kHz to 200kHz, and after sample 1 and sample 3 were bonded, the resonance frequencies of sample 1 shifted in the bonded sample, and the specific shift amount of each resonance frequency was different, and no lack of resonance frequency was observed.
Table 6 shows the comparison of the first 20 resonance frequencies in the frequency band of 60kHz to 200kHz for the combined sample of sample 1 and sample 1 with sample 3 in FIG. 7.
Since the resonant frequency in the bonded sample is partially shifted from the resonant frequency of a single sample, the magnitude of the shift amount of each pair of resonant frequencies is listed in the table and averaged, and the average frequency deviation is found to be 4.066kHz, and the average relative frequency shift is 3.95%, which shows that the resonant frequency of the bonded sample 1 and the bonded sample 3 is shifted.
TABLE 6
Fig. 8 is the resonance lines before and after deformation of sample 2 in the example of the present invention, in which the solid line is the resonance line before deformation and the broken line is the resonance line after deformation.
As shown in fig. 8, the frequency range is 20kHz to 200kHz, and the resonance spectrum before and after the sample 2 is deformed changes significantly in spectrum view, and the peak position of the resonance spectrum has a significant difference.
Table 7 is a comparison of the first 20 resonance frequencies in the frequency band range of 20kHz to 200kHz between the results of two measurements before and after sample 2 is crushed in FIG. 8.
By comparison, the average relative error of the first 20 resonance frequencies in the frequency band range of 20 kHz-200 kHz is 14.774%, and the error is large, so that the deformation of the sample changes the original resonance frequency.
TABLE 7
Examples effects and effects
According to the jewelry and jewelry acoustic resonance spectrum imitation method provided by the embodiment, in the embodiment, two silver bead samples, two agate bead samples and a bonding sample of the silver bead and the agate bead samples are subjected to multiple times of acoustic resonance spectrum measurement and analysis. The method is used for solving the difficulties of rapid identification of the original products, prevention of damage, bag adjustment and the like in the processes of storing, transporting, trading, returning and exchanging the jewelry and the like, and overcomes the defects of low detection accuracy, complex operation, expensive equipment and the like in the existing jewelry detection method.
The above examples are merely illustrative of the implementation and analysis results of the method for simulating the acoustic resonance spectrum of jewelry and jewelry according to the present invention, but the present invention is not limited to the above examples, and the method according to the present invention is also effective for other types of jewelry and jewelry.
Claims (8)
1. A jewelry and jewelry acoustic resonance spectrum counterfeiting method is used for measurement analysis and anti-counterfeiting identification of the jewelry and is characterized by comprising the following steps:
s1, building an acoustic resonance spectrum measurement system comprising an acoustic emission/receiving probe, an amplifier, a spectrum analyzer and a computer, adjusting the spectrum scanning range of the spectrum analyzer to enable the spectrum range to comprise the frequencies of the measured jewelries and jewelries, and setting the frequency sweeping sampling point number and the data sampling precision of the spectrum analyzer;
step S2, the acoustic emission/receiving probe is adopted to generate acoustic vibration, the tested jewelry and jewelry are excited to resonate, the resonant acoustic signal is received, then the acoustic signal is amplified by the amplifier, and the amplified acoustic signal is subjected to sweep frequency measurement by the spectrum analyzer, so that the resonance frequency spectrum of the tested jewelry and jewelry is obtained;
step S3, extracting the resonance frequency corresponding to the acoustic co-spectral peak of the jewelry and jewelry to be detected in the resonance spectrum, and further analyzing the spectral line width of each resonance spectral peak by using the spectrum analyzer, thereby obtaining the corresponding quality factor Q;
and step S4, comparing the resonance spectral line, the resonance frequency and the quality factor Q obtained by analysis with standard data stored in a database by using the computer to obtain a difference, and performing the anti-counterfeiting identification on the tested jewelry and the jewelry according to the difference obtained by comparison.
2. The jewelry and jewelry acoustic resonance spectrum counterfeiting method according to claim 1, characterized in that:
the acoustic emission/receiving probe is a single or a plurality of discrete probes, and each probe can be used for emitting vibration excitation and receiving vibration signals.
3. The jewelry and jewelry acoustic resonance spectrum counterfeiting method according to claim 1, characterized in that:
the measured jewels and ornaments comprise solid materials which are made of metal, alloy, aggregate, tooth, shell, pearl, fossil, amber, ore, plastic, glass, gem and wood, and jewels and ornaments which are formed by combining and inlaying a plurality of solid materials.
4. The jewelry and jewelry acoustic resonance spectrum counterfeiting method according to claim 1, characterized in that:
wherein the frequency spectrum comprises resonance frequency caused by mechanical vibration in all samples above 0Hz, and the bandwidth of the frequency spectrum comprises the resonance peak of the jewelry and jewelry to be detected.
5. The jewelry and jewelry acoustic resonance spectrum counterfeiting method according to claim 1, characterized in that:
wherein the step S2 includes the following steps:
exciting free resonance of the measured jewelry and the jewelry by using the acoustic vibration, and carrying out one or more times of sweep frequency measurement to obtain resonance frequency spectrums of the measured jewelry and the jewelry;
and when the same measuring position and angle of the measured jewelry and the jewelry are measured for multiple times and the placing positions and angles of the measured jewelry and the jewelry are changed, multiple groups of resonance spectral lines with different amplitudes and phases are obtained.
6. The jewelry and jewelry acoustic resonance spectrum counterfeiting method according to claim 1, characterized in that:
wherein the step S3 includes the following steps:
extracting the resonance frequency [ f ] corresponding to the acoustic co-spectral peak of the jewelry and the jewelry to be detected1,f2,…fn]Analyzing and calculating to obtain the quality factor [ Q ] corresponding to the spectral line width at the resonance spectrum peak1,Q2,…Qn]：
Wherein, BW0.7Indicating a drop in amplitude intensity to a peak
The spectral bandwidth of time.
7. The jewelry and jewelry acoustic resonance spectrum counterfeiting method according to claim 1, characterized in that:
wherein, step S4 includes the following steps:
comparing the resonance spectral lines, the resonance frequencies and the quality factors Q obtained by analysis with stored standard data, and analyzing whether the resonance spectral lines, the resonance frequencies and the quality factors Q of the jewelry to be tested are consistent with the standard data stored in a database or not or analyzing whether the resonance parameters of the jewelry to be tested are consistent with the resonance parameter information obtained by a given standard component through measurement or theoretical calculation or not according to the positions and the numbers of the resonance spectral peaks, the offset of the center frequency of the spectral peaks and the change of the quality factors Q of each spectral peak;
if the measured jewelry and the jewelry are consistent, judging that the measured jewelry and the jewelry are genuine and are not damaged;
if not, judging that the jewelry to be detected and the jewelry are damaged or fake.
8. The jewelry and jewelry acoustic resonance spectrum counterfeiting method according to claim 1, characterized in that:
wherein, when the resonance parameters of the measured jewelry and jewelry are inconsistent with the resonance parameter information obtained by measurement or theoretical calculation of a given standard component:
if the resonance spectrum peak has deviation, spectrum peak loss or a new resonance spectrum peak, judging that the jewelry and the jewelry to be detected have deformation or crack damage;
and if the resonance spectrum peak is obviously different from the genuine article data, judging that the jewelry to be detected and the jewelry are fake articles with different materials or shapes.
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| CN111829650A (en) * | 2020-07-30 | 2020-10-27 | 方博科技(深圳)有限公司 | Algorithm for testing frequency sweep parameters by using single-frequency signal combination |
| CN113325085A (en) * | 2021-08-03 | 2021-08-31 | 深圳市深国检珠宝检测有限公司 | Detection device and detection method for detecting stability of jewelry inlaid with precious stones |
| EP4053553A1 (en) * | 2021-03-03 | 2022-09-07 | Commissariat à l'Energie Atomique et aux Energies Alternatives | Method for detecting fissures in a part made from an aluminium alloy produced by additive manufacturing |
| CN116659797A (en) * | 2023-08-02 | 2023-08-29 | 宁德时代新能源科技股份有限公司 | Impact response spectrum determining method, device, computer equipment and storage medium |
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