WO2012058842A1 - Apparatus and method for identifying and verifying gemstone - Google Patents

Apparatus and method for identifying and verifying gemstone Download PDF

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Publication number
WO2012058842A1
WO2012058842A1 PCT/CN2010/079996 CN2010079996W WO2012058842A1 WO 2012058842 A1 WO2012058842 A1 WO 2012058842A1 CN 2010079996 W CN2010079996 W CN 2010079996W WO 2012058842 A1 WO2012058842 A1 WO 2012058842A1
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Prior art keywords
gemstone
frequency response
response spectrum
signals
digital control
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PCT/CN2010/079996
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French (fr)
Inventor
Yun-Kai Kwong
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Top Art Jewellery(Mfg) Ltd
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Publication of WO2012058842A1 publication Critical patent/WO2012058842A1/en

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Classifications

    • 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
    • G01N29/46—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by spectral analysis, e.g. Fourier analysis or wavelet analysis
    • 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
    • G01N29/11—Analysing solids by measuring attenuation of acoustic waves
    • 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
    • G01N29/36—Detecting the response signal, e.g. electronic circuits specially adapted therefor
    • G01N29/42—Detecting the response signal, e.g. electronic circuits specially adapted therefor by frequency filtering or by tuning to resonant frequency
    • 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
    • G01N29/4454—Signal recognition, e.g. specific values or portions, signal events, signatures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/389—Precious stones; Pearls
    • 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
    • G01N2291/0232—Glass, ceramics, concrete or stone

Definitions

  • the present invention relates to an apparatus and method for identifying and verifying a gemstone, and particularly relates to an apparatus and method employing acoustic resonant techniques to identify and verify a gemstone.
  • U.S. patent No.5379102 provides one optical identification method, it is still based on image optics method, and the identification method is complicated.
  • the present invention provides an apparatus and a method for rapid and effective gemstone identification, and the method is carried out by pre-recording frequency response spectrum of the gemstone, and saving the record as the marker of the gemstone identification.
  • Each substance has its own specific natural frequency , and then with the exciting from the environment, the substance can make vibration by forced. If the exciting frequency of the environment is similar to that of the natural frequency of the substance, the vibration amplitude of the substance will greatly increase.
  • the exciting frequency is the resonance frequency of the substance.
  • the resonance frequency of the gemstone is in accordance with the factors of size, quality and elastic constant, and the elastic constant depends on the perfection of the pureness and the crystal, and the quality.
  • the inner crack, impurity and other flaws of the gemstone would impact the resonance frequency directly. Therefore, when the gemstone is vibrating by forced, the resonance frequency is different from each other and the vibration curve is also unique, so that the vibration curve could be used to identifying gemstone.
  • the present invention provides an apparatus for identifying gemstone, wherein the apparatus includes:
  • an exciter electronically coupled with a digital control module for exciting a gemstone
  • an acoustic receiver electronically coupled with the digital control module, wherein the acoustic receiver is being disposed at one side of the gemstone for receiving the acoustic signals emitted from the excited testing gemstone and transferring the received acoustic signals to the digital control module;
  • the digital control module electronically coupled with the exciter, a storage module and the acoustic receiver respectively, for processing the received acoustic signal of the gemstone, and converting the acoustic signals into frequency response spectrum of the gemstone, and then sending to the storage module;
  • the storage module electronically coupled with the digital control module for receiving the frequency response spectrum of the gemstone from the digital control module; and an identification module electronically coupled with the digital control module, wherein the identification module compares the received frequency response spectrum of the gemstone with the frequency response spectrum of the gemstone saved in the storage module, so as to identify and verify whether the gemstone is authentic.
  • the present invention also provides a method for identifying gemstone, and the identification method is based on the frequency response spectrum of the gemstones.
  • the method comprising a recording process of the frequency response spectrum of the gemstone, and an identifying and verifying process; wherein the recording process of the frequency response spectrum comprises the following steps: [0014] step Al : disposing the gemstone at a designated location;
  • step A2 generating an acoustic signal from an exciter to excite the gemstone, wherein the gemstone generates specific frequency signals after being excited;
  • step A3 receiving the specific frequency signals by an acoustic receiver, and transferring the received specific frequency signals as acoustic signals to a digital control module;
  • step A4 processing the acoustic signals by a digital control module into a frequency response spectrum, and then the frequency response spectrum is sent to a storage module; and wherein the identifying and verifying process comprises the following steps:
  • step B l disposing the gemstone on the designated location
  • step B2 generating an acoustic signal by an exciter to excite the gemstone, wherein the gemstone generates specific frequency signals after being excited;
  • step B3 receiving the specific frequency signals by an acoustic receiver, and transferring the received specific frequency signals as acoustic signals to a digital control module;
  • step B4 processing the acoustic signals by the digital control module into a frequency response spectrum, and then the frequency response spectrum is sent to a storage module and a identification module;
  • step B5 comparing the frequency response spectrum of the gemstone by the identification module with the frequency response spectrum saved in the recording step, thereafter the identification module identifies whether the gemstone needed identifying is the one that had been recorded in the storage module.
  • the method could be used to combine with the common testing method at present, for instance, after detailed and precise testing, the frequency response spectrums of a plurality of gemstone are correspondingly recorded. Using the frequency testing method to get the identity information of any of the gemstone. [0024] Comparing with the prior art, the above method has the advantages as follows:
  • the frequency response spectrum of the gemstones on the forced vibration is used to identify and verify the gemstone, so that the gemstone could not be damage in the identifying processing;
  • FIG. l is a schematic view for an embodiment of the present invention.
  • FIG.2 is a schematic view of the recording time response curve of one gemstone
  • FIG.3 is a schematic view of the recording frequency response curve of one gemstone
  • FIG.4 is a contrastive schematic view of the frequency response curves of different kinds of gemstones
  • FIG.5 is a contrastive schematic view of the frequency response curves of 4 different diamonds
  • FIG.6 is a connection schematic view according to the first embodiment of the present invention.
  • FIG.7 is a schematic view of frequency response spectrum of the gemstone A according to the first embodiment of the present invention.
  • FIG.8 is a schematic view of frequency response spectrum of the gemstone B according to the first embodiment of the present invention.
  • the apparatus for identifying gemstone in the present invention includes:
  • an exciter 1 electronically coupled with a digital control module for exciting a gemstone
  • an acoustic receiver 2 electronically coupled with the digital control module 3, wherein the acoustic receive is disposed at one side of the gemstone for receiving the acoustic signals emitted from the excited testing gemstone and transferring the received acoustic signals to the digital control module 3;
  • the digital control module 3 electronically coupled with the exciter 1, a storage module 4 and the acoustic receiver 2 respectively, for processing the received acoustic signal of the gemstone, and converting the acoustic signals into frequency response spectrum of the gemstone, and then sending to the storage module 4;
  • the storage module 4 electronically coupled with the digital control module for receiving the frequency response spectrum of the gemstone from the digital control module 3 ;
  • an identification module 5 electronically coupled with the digital control module 3, wherein the identification module 5 compares the received frequency response spectrum of the gemstone with the frequency response spectrum of the gemstone saved in the storage module 4, so as to identify and verify whether the gemstone is authentic.
  • the exciter 1 can be selected from an electromagnetic vibration exciter or a mechanical exciter, e.g. the exciter with the electromagnetic vibration being generated by electric hammer or electromagnet force, or the exciter with the mechanical vibration being generated by mechanism system strike.
  • the exciter 1 could be electrically connected with the digital control module 3, whereby the exciting frequency could be controlled under the digital control module 3, and different exciting frequency curves could be put out under different situations.
  • the gemstone exciting method of the exciter 1 could employ non-contacting electric hammer or electromagnet force to excite the gemstone to vibrate, so that the gemstone generates specific frequency signal; the exciter 1 could also drive the gemstone to vibrate directly, so that the gemstone generates specific frequency signal, but this method would be more complicated, the acoustic signal from the exciter 1 could interfere with the specific frequency signal generated from the gemstone after excited, the preferable embodiment is carried out by employing non-contacting electric hammer or electromagnet force to excite the gemstone, then the testing precision could be improved.
  • the specific frequency signal generated from the gemstone are received by the acoustic receiver 2 such as high-precision microphone, which is arranged on a place that is convenient to receive the signal from the gemstone, in order to collect the specific frequency signal from the excited gemstone; the digital control module 3 is used to process the collected specific frequency signal, e.g. a high-speed converter could be used to convert the specific frequency signal into the digital signal, or a filter could be employed to remove the background noise, or Fourier Transformation or Fast Fourier Transformation is employed to convert the specific frequency signal into frequency signal.
  • the acoustic receiver 2 such as high-precision microphone
  • the method for identifying gemstone according to the present invention is carried out by recording the frequency response spectrum of the gemstone in the storage module 4, when identifying gemstone, testing the frequency response spectrum and comparing with the recording frequency response spectrum, so as to judge whether the gemstone which is needed to identify is the recording gemstone.
  • the specific frequency response spectrum of the gemstone is the compared basis, the identifying method comprising a recording process of the frequency response spectrum of the gemstone and an identifying and verifying process.
  • step Al disposing the gemstone at a designated location
  • step A2 generating an acoustic signal from an exciter 1 to excite the gemstone, wherein the gemstone generates specific frequency signals after being excited;
  • step A3 receiving the specific frequency signals by an acoustic receiver 2, and transferring the received specific frequency signals as acoustic signals to a digital control module 3 ;
  • step A4 processing the acoustic signals by a digital control module 3 into a frequency response spectrum, and then the frequency response spectrum is sent to a storage module 4;
  • the identifying and verifying process of the gemstone further comprising the following steps:
  • step B l disposing the gemstone on the designated location
  • step B2 generating an acoustic signal by an exciter 1 to excite the gemstone, wherein the gemstone generates specific frequency signals after being excited;
  • step B3 receiving the specific frequency signals by an acoustic receiver 2, and transferring the received specific frequency signals as acoustic signals to a digital control module 3;
  • step B4 processing the acoustic signals by the digital control module 3 into a frequency response spectrum, and then the frequency response spectrum is sent to a storage module 4 and an identification module 5 ;
  • step B5 comparing the frequency response spectrum of the gemstone by the identification module with the frequency response spectrum saved in the recording step, thereafter the identification module 5 identifies whether the gemstone needed identifying is the one that had been recorded in the storage module 4.
  • the specific frequency signal of the gemstone is received by the acoustic receiver 2, and finally converted into the specific frequency response spectrum.
  • Figs.2-6 show different forms of the spectrum.
  • the specific frequency signal of the gemstone can be converted into the corresponding voltage.
  • Fig.2 is a schematic view of the recording time response curve of one gemstone, the amplitude thereof is act as the specific frequency signal, the time response curve demonstrates the change of the specific frequency signals as time goes by after one exciting to the gemstone;
  • FIG.3 is a schematic view of the recording frequency response curve of one gemstone, the amplitude thereof is act as the specific frequency signal, the frequency response curve demonstrates that the gemstone generates specific frequency signals with different frequency exciting.
  • Fig.5 is a contrastive schematic view of the frequency response curves of four different diamonds c, d, e and f, the shapes of these curves are similar to each other approximately, but the wave crest and the wave trough of the curves are different, so it could be concluded that there are four different diamonds. Since the gemstone acoustic signals without processing by the digital control module 3 are saved in the storage module, so different process ways are employed according to the requirements, the contrastive purpose are obvious.
  • the method is convenient and rapid, and brings no damages to the gemstone itself, it could be used to combine with the common testing method at present, for instance, after detailed and precise testing of a batch of gemstones, the frequency response spectrums are correspondingly recorded, when it needs to know the detailed information associated with any of the gemstones, the detailed information could be obtained only by frequency testing.
  • the exciter 1 is positioned on a transmitting terminal 11 and electrically connected with a computer 7, the exciter 1 excites the gemstone frequency to emit from the transmitting terminal 11, the exciting frequency could be controlled under the computer 7, the gemstone 6 would be arranged on the platform 8 of the transmitting terminal 11 of the exciter 1, the acoustic receiver 2 is a high-precision microphone, which is placed correspondingly to the gemstone 6.
  • the digital control module 3, storage module 4 and identification module 5 are arranged in the computer 7.
  • step Al setting diamond A on the location marked 6 in Fig.6.;
  • step A2 the exciter 1 is power on, and it is under control of computer 7, the acoustic signals characteristic of 0- lOOMHZ are emitted to diamond A through the transmitting terminal 11, and excites diamond A, then diamond A emits specific frequency signals under the excite of the acoustic signals;
  • step A3 the acoustic receiver 2 receives the specific frequency signals, and converts them into the corresponding acoustic signals, and inputs the acoustic signals to the digital control module 3 of the computer 7;
  • step A4 digital control module 3 converts the acoustic signals to digital signals, and processes the digital signals with filtering and Fast Fourier Transformation, and changed into frequency response spectrum, then saves the acoustic signals before processing and the frequency response spectrum after processing in the storage module 4 of the computer 7, the recording step of frequency response spectrum of gemstone A is finished.
  • curve G is the frequency response curve of gemstone A.
  • step B l setting diamond B on the location marked 6 in Fig.6.;
  • step B2 the exciter 1 is power on, and it is under control of computer 7, the acoustic signals characteristic of 0- lOOMHZ are emitted to diamond B through the transmitting terminal 11, and excites diamond B, then diamond B emits specific frequency signals under the excite of the acoustic signals;
  • step B3 the acoustic receiver 2 receives the specific frequency signals, and converts them into the corresponding acoustic signals, and inputs the acoustic signals to the digital control module 3 of the computer 7;
  • step B4 digital control module 3 converts the acoustic signals to digital signals, and processes the digital signals with filtering and Fast Fourier Transformation, and changed into frequency response spectrum, then sends the acoustic signals before processing and the frequency response spectrum after processing in the storage module 4 and the identification module 5 of the computer 7;
  • curve H is the frequency response curve of diamond B.
  • step B5 after the identification module 5 receives the frequency response spectrum of diamond B, the identification module 5 fetches the frequency response spectrum of diamond A of the storage module 4, and compares the two frequency response spectrums, under the situation without any testing error, because the frequency response spectrum G of Fig.7 is identical with the frequency response spectrum H of Fig.8, and the corresponding location of the coordinates of both two are identical with each other, diamond B is identical with diamond A.

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Abstract

An apparatus and method for identifying and verifying gemstones. The principle is carried out by pre-recording the frequency response spectrum of gemstones, storing the pre-recorded frequency response spectrum, and using the stored frequency response spectrum to identify and verify gemstones thereafter. The apparatus includes an exciter, an acoustic receiver, a digital control module, a storage module, and an identification module. After properly disposing a specimen gemstone, the exciter sends exciting signals to the specimen gemstone, then the specimen gemstone being excited emits unique acoustic signals; the acoustic receiver receives the unique acoustic signals; the acoustic signals are then transferred to the digital control module; the digital control module transforms the received acoustic signals to the frequency response spectrum of the specimen gemstone, and then sends the frequency response spectrum to the storage module for storage; the identification module fetches the stored data from the storage module to identify and verify the gemstone. The identifying and verifying method is convenient, rapid and with low cost; more importantly, it causes no damage to the gemstone itself.

Description

APPARATUS AND METHOD FOR IDENTIFYING AND VERIFYING
GEMSTONE
CROSS-REFERNCE TO RELATED DOCUMENTS
[0001] The present invention claims priority from China patent No. 201010539483.4, filed on November 4, 2010 and entitled APPARATUS AND METHORD FOR INDENTIFYING AND VERIFYING GEMSTONE, the entire content of which is incorporated herein by reference.
FIELD OF THE INVENTION
[0002] The present invention relates to an apparatus and method for identifying and verifying a gemstone, and particularly relates to an apparatus and method employing acoustic resonant techniques to identify and verify a gemstone.
BACKGROUND OF THE INVENTION
[0003] There are many kinds of gemstones, and their value differs from each other in a thousand ways. Owing to their small size and sophisticated structure of gemstones, it is not possible to tell apart every gemstone through our eyes alone. For example, as per one gemstone is corresponding to one certificate of authentication, how to assure that this certificate of authentication belongs to this gemstone? Or if this gemstone is stolen, and then it got back, how to assure that the gemstone which is got back is the one which is stolen? Regarding this situation, there is a common solution based on optical measuring method at present such as laser light or X ray, however, this kind of method is not only complicated and time-consuming, but also carried out by professional person to conduct technical identification, basing on expensive testing instrument. There is another simpler identification method, which is carried out by etching specific numbers on the surface or the waist of the gemstone after specific test by laser light as identification, and the numbers are extremely tiny, which is merely seen via high magnified glass, for instance, a identification method and system of gemstone disclosed in Chinese patent with application No. 02143195.7, had some drawbacks, e.g., the identification numbers etched on the gemstone could be eliminated in some ways, then the identification could not be told apart. Furthermore, this identification method itself is carried out by etching, which impacts the perfectibility of the gemstone, and changes the physical properties of the gemstone irreversibly.
[0004] U.S. patent No.5379102 provides one optical identification method, it is still based on image optics method, and the identification method is complicated.
[0005] Therefore, it is greatly necessary to built up a gemstone identification method characteristic of simplification and credibility, to overcome the drawbacks of the present testing method. Currently, sound wave has a wide use in testing filed without damage, e.g. using sound wave to detect geology, schist soil or construction, etc, it possesses simple operation, and low cost.
SUMMARY OF THE INVENTION
[0006] Aim at the above-mentioned problems, the present invention provides an apparatus and a method for rapid and effective gemstone identification, and the method is carried out by pre-recording frequency response spectrum of the gemstone, and saving the record as the marker of the gemstone identification.
[0007] Each substance has its own specific natural frequency , and then with the exciting from the environment, the substance can make vibration by forced. If the exciting frequency of the environment is similar to that of the natural frequency of the substance, the vibration amplitude of the substance will greatly increase. The exciting frequency is the resonance frequency of the substance. As well known, the resonance frequency of the gemstone is in accordance with the factors of size, quality and elastic constant, and the elastic constant depends on the perfection of the pureness and the crystal, and the quality. The inner crack, impurity and other flaws of the gemstone would impact the resonance frequency directly. Therefore, when the gemstone is vibrating by forced, the resonance frequency is different from each other and the vibration curve is also unique, so that the vibration curve could be used to identifying gemstone.
[0008] The present invention provides an apparatus for identifying gemstone, wherein the apparatus includes:
[0009] an exciter electronically coupled with a digital control module for exciting a gemstone;
[0010] an acoustic receiver electronically coupled with the digital control module, wherein the acoustic receiver is being disposed at one side of the gemstone for receiving the acoustic signals emitted from the excited testing gemstone and transferring the received acoustic signals to the digital control module;
[0011] the digital control module electronically coupled with the exciter, a storage module and the acoustic receiver respectively, for processing the received acoustic signal of the gemstone, and converting the acoustic signals into frequency response spectrum of the gemstone, and then sending to the storage module;
[0012] the storage module electronically coupled with the digital control module for receiving the frequency response spectrum of the gemstone from the digital control module; and an identification module electronically coupled with the digital control module, wherein the identification module compares the received frequency response spectrum of the gemstone with the frequency response spectrum of the gemstone saved in the storage module, so as to identify and verify whether the gemstone is authentic.
[0013] The present invention also provides a method for identifying gemstone, and the identification method is based on the frequency response spectrum of the gemstones. The method comprising a recording process of the frequency response spectrum of the gemstone, and an identifying and verifying process; wherein the recording process of the frequency response spectrum comprises the following steps: [0014] step Al : disposing the gemstone at a designated location;
[0015] step A2: generating an acoustic signal from an exciter to excite the gemstone, wherein the gemstone generates specific frequency signals after being excited;
[0016] step A3: receiving the specific frequency signals by an acoustic receiver, and transferring the received specific frequency signals as acoustic signals to a digital control module; and
[0017] step A4: processing the acoustic signals by a digital control module into a frequency response spectrum, and then the frequency response spectrum is sent to a storage module; and wherein the identifying and verifying process comprises the following steps:
[0018] step B l : disposing the gemstone on the designated location;
[0019] step B2: generating an acoustic signal by an exciter to excite the gemstone, wherein the gemstone generates specific frequency signals after being excited;
[0020] step B3: receiving the specific frequency signals by an acoustic receiver, and transferring the received specific frequency signals as acoustic signals to a digital control module;
[0021] step B4: processing the acoustic signals by the digital control module into a frequency response spectrum, and then the frequency response spectrum is sent to a storage module and a identification module; and
[0022] step B5 : comparing the frequency response spectrum of the gemstone by the identification module with the frequency response spectrum saved in the recording step, thereafter the identification module identifies whether the gemstone needed identifying is the one that had been recorded in the storage module.
[0023] The method could be used to combine with the common testing method at present, for instance, after detailed and precise testing, the frequency response spectrums of a plurality of gemstone are correspondingly recorded. Using the frequency testing method to get the identity information of any of the gemstone. [0024] Comparing with the prior art, the above method has the advantages as follows:
[0025] Firstly, the frequency response spectrum of the gemstones on the forced vibration is used to identify and verify the gemstone, so that the gemstone could not be damage in the identifying processing;
[0026] Secondly, it is convenient and rapid to identify gemstone without using complicated apparatus or professional skill.
BRIEF DESCRIPTION OF THE DRAWINGS
[0027] FIG. l is a schematic view for an embodiment of the present invention;
[0028] FIG.2 is a schematic view of the recording time response curve of one gemstone;
[0029] FIG.3 is a schematic view of the recording frequency response curve of one gemstone;
[0030] FIG.4 is a contrastive schematic view of the frequency response curves of different kinds of gemstones;
[0031] FIG.5 is a contrastive schematic view of the frequency response curves of 4 different diamonds;
[0032] FIG.6 is a connection schematic view according to the first embodiment of the present invention;
[0033] FIG.7 is a schematic view of frequency response spectrum of the gemstone A according to the first embodiment of the present invention;
[0034] FIG.8 is a schematic view of frequency response spectrum of the gemstone B according to the first embodiment of the present invention;
DETAILED DESCRIPTION OF ILLUSTRATED EMBODIMENTS
[0035] Referring to Figs.1-8, the apparatus for identifying gemstone in the present invention includes:
[0036] an exciter 1 electronically coupled with a digital control module for exciting a gemstone; [0037] an acoustic receiver 2 electronically coupled with the digital control module 3, wherein the acoustic receive is disposed at one side of the gemstone for receiving the acoustic signals emitted from the excited testing gemstone and transferring the received acoustic signals to the digital control module 3;
[0038] the digital control module 3 electronically coupled with the exciter 1, a storage module 4 and the acoustic receiver 2 respectively, for processing the received acoustic signal of the gemstone, and converting the acoustic signals into frequency response spectrum of the gemstone, and then sending to the storage module 4;
[0039] the storage module 4 electronically coupled with the digital control module for receiving the frequency response spectrum of the gemstone from the digital control module 3 ; and
[0040] an identification module 5 electronically coupled with the digital control module 3, wherein the identification module 5 compares the received frequency response spectrum of the gemstone with the frequency response spectrum of the gemstone saved in the storage module 4, so as to identify and verify whether the gemstone is authentic.
[0041] The exciter 1 can be selected from an electromagnetic vibration exciter or a mechanical exciter, e.g. the exciter with the electromagnetic vibration being generated by electric hammer or electromagnet force, or the exciter with the mechanical vibration being generated by mechanism system strike. The exciter 1 could be electrically connected with the digital control module 3, whereby the exciting frequency could be controlled under the digital control module 3, and different exciting frequency curves could be put out under different situations.
[0042] The gemstone exciting method of the exciter 1 could employ non-contacting electric hammer or electromagnet force to excite the gemstone to vibrate, so that the gemstone generates specific frequency signal; the exciter 1 could also drive the gemstone to vibrate directly, so that the gemstone generates specific frequency signal, but this method would be more complicated, the acoustic signal from the exciter 1 could interfere with the specific frequency signal generated from the gemstone after excited, the preferable embodiment is carried out by employing non-contacting electric hammer or electromagnet force to excite the gemstone, then the testing precision could be improved.
[0043] The specific frequency signal generated from the gemstone are received by the acoustic receiver 2 such as high-precision microphone, which is arranged on a place that is convenient to receive the signal from the gemstone, in order to collect the specific frequency signal from the excited gemstone; the digital control module 3 is used to process the collected specific frequency signal, e.g. a high-speed converter could be used to convert the specific frequency signal into the digital signal, or a filter could be employed to remove the background noise, or Fourier Transformation or Fast Fourier Transformation is employed to convert the specific frequency signal into frequency signal.
[0044] The method for identifying gemstone according to the present invention is carried out by recording the frequency response spectrum of the gemstone in the storage module 4, when identifying gemstone, testing the frequency response spectrum and comparing with the recording frequency response spectrum, so as to judge whether the gemstone which is needed to identify is the recording gemstone. The specific frequency response spectrum of the gemstone is the compared basis, the identifying method comprising a recording process of the frequency response spectrum of the gemstone and an identifying and verifying process.
[0045] The recording process of the frequency response spectrum of the gemstone further comprising the following steps:
[0046] step Al : disposing the gemstone at a designated location;
[0047] step A2: generating an acoustic signal from an exciter 1 to excite the gemstone, wherein the gemstone generates specific frequency signals after being excited;
[0048] step A3: receiving the specific frequency signals by an acoustic receiver 2, and transferring the received specific frequency signals as acoustic signals to a digital control module 3 ; and
[0049] step A4: processing the acoustic signals by a digital control module 3 into a frequency response spectrum, and then the frequency response spectrum is sent to a storage module 4;
[0050] The identifying and verifying process of the gemstone further comprising the following steps:
[0051] step B l : disposing the gemstone on the designated location;
[0052] step B2: generating an acoustic signal by an exciter 1 to excite the gemstone, wherein the gemstone generates specific frequency signals after being excited;
[0053] step B3: receiving the specific frequency signals by an acoustic receiver 2, and transferring the received specific frequency signals as acoustic signals to a digital control module 3;
[0054] step B4: processing the acoustic signals by the digital control module 3 into a frequency response spectrum, and then the frequency response spectrum is sent to a storage module 4 and an identification module 5 ; and
[0055] step B5 : comparing the frequency response spectrum of the gemstone by the identification module with the frequency response spectrum saved in the recording step, thereafter the identification module 5 identifies whether the gemstone needed identifying is the one that had been recorded in the storage module 4.
[0056] The specific frequency signal of the gemstone is received by the acoustic receiver 2, and finally converted into the specific frequency response spectrum. Figs.2-6 show different forms of the spectrum. The specific frequency signal of the gemstone can be converted into the corresponding voltage. Fig.2 is a schematic view of the recording time response curve of one gemstone, the amplitude thereof is act as the specific frequency signal, the time response curve demonstrates the change of the specific frequency signals as time goes by after one exciting to the gemstone; FIG.3 is a schematic view of the recording frequency response curve of one gemstone, the amplitude thereof is act as the specific frequency signal, the frequency response curve demonstrates that the gemstone generates specific frequency signals with different frequency exciting. These curves are in accordance with the natural frequency of the gemstone, and impacted with the size, quality, pureness, perfection of the crystal of the gemstone, and the inner crack, impurity and other flaws of the gemstone would impact the response curve, so the response curve of each gemstone is unique.
[0057] In order to outstanding the characteristic of these curves, for easy comparing, these curves could be processed to the contrastive schematic view showing the frequency response curves in Figs.4-5, demonstrating that the specific frequency signals are different from each other when the gemstone is excited by different frequency. The wave crest and the wave trough of the curve a and curve b shown in Fig.4 are distinctly different from each other, whereby it could be primarily concluded that these two curves stand for two different gemstones, moreover, the shape of the curve is not similar to each other, so it could be concluded that these frequency response curves are generated from different gemstones; Fig.5 is a contrastive schematic view of the frequency response curves of four different diamonds c, d, e and f, the shapes of these curves are similar to each other approximately, but the wave crest and the wave trough of the curves are different, so it could be concluded that there are four different diamonds. Since the gemstone acoustic signals without processing by the digital control module 3 are saved in the storage module, so different process ways are employed according to the requirements, the contrastive purpose are obvious.
[0058] The method is convenient and rapid, and brings no damages to the gemstone itself, it could be used to combine with the common testing method at present, for instance, after detailed and precise testing of a batch of gemstones, the frequency response spectrums are correspondingly recorded, when it needs to know the detailed information associated with any of the gemstones, the detailed information could be obtained only by frequency testing.
[0059] In the first embodiment, referring to Figs.1-6, the exciter 1 is positioned on a transmitting terminal 11 and electrically connected with a computer 7, the exciter 1 excites the gemstone frequency to emit from the transmitting terminal 11, the exciting frequency could be controlled under the computer 7, the gemstone 6 would be arranged on the platform 8 of the transmitting terminal 11 of the exciter 1, the acoustic receiver 2 is a high-precision microphone, which is placed correspondingly to the gemstone 6. The digital control module 3, storage module 4 and identification module 5 are arranged in the computer 7.
[0060] The embodiment of identifying a gemstone A hereinafter, which demonstrates the identifying method and process, before identifying, recording the frequency response spectrum of gemstone A, and the recording steps are as follows:
[0061] step Al : setting diamond A on the location marked 6 in Fig.6.;
[0062] step A2: the exciter 1 is power on, and it is under control of computer 7, the acoustic signals characteristic of 0- lOOMHZ are emitted to diamond A through the transmitting terminal 11, and excites diamond A, then diamond A emits specific frequency signals under the excite of the acoustic signals;
[0063] step A3: the acoustic receiver 2 receives the specific frequency signals, and converts them into the corresponding acoustic signals, and inputs the acoustic signals to the digital control module 3 of the computer 7;
[0064] step A4: digital control module 3 converts the acoustic signals to digital signals, and processes the digital signals with filtering and Fast Fourier Transformation, and changed into frequency response spectrum, then saves the acoustic signals before processing and the frequency response spectrum after processing in the storage module 4 of the computer 7, the recording step of frequency response spectrum of gemstone A is finished. In the schematic view of the frequency response spectrum of Fig.7, curve G is the frequency response curve of gemstone A.
[0065] If want to know whether a diamond B is the one that is recorded gemstone A, it should compare the frequency response spectrum of diamond B with the frequency response spectrum of diamond A. Without considering the testing error, if the frequency response spectrums of two gemstones are identical, and then diamond B is the same as diamond A, contrariwise, diamond B is different from diamond A.
[0066] The detailed identifying process is as follows:
[0067] step B l : setting diamond B on the location marked 6 in Fig.6.; [0068] step B2: the exciter 1 is power on, and it is under control of computer 7, the acoustic signals characteristic of 0- lOOMHZ are emitted to diamond B through the transmitting terminal 11, and excites diamond B, then diamond B emits specific frequency signals under the excite of the acoustic signals;
[0069] step B3: the acoustic receiver 2 receives the specific frequency signals, and converts them into the corresponding acoustic signals, and inputs the acoustic signals to the digital control module 3 of the computer 7;
[0070] step B4: digital control module 3 converts the acoustic signals to digital signals, and processes the digital signals with filtering and Fast Fourier Transformation, and changed into frequency response spectrum, then sends the acoustic signals before processing and the frequency response spectrum after processing in the storage module 4 and the identification module 5 of the computer 7; In the schematic view of frequency response spectrum of Fig.8, curve H is the frequency response curve of diamond B.
[0071] step B5 : after the identification module 5 receives the frequency response spectrum of diamond B, the identification module 5 fetches the frequency response spectrum of diamond A of the storage module 4, and compares the two frequency response spectrums, under the situation without any testing error, because the frequency response spectrum G of Fig.7 is identical with the frequency response spectrum H of Fig.8, and the corresponding location of the coordinates of both two are identical with each other, diamond B is identical with diamond A.

Claims

WHAT IS CLAIMED IS:
1. An apparatus for identifying and verifying a gemstone, said apparatus comprising:
an exciter electronically coupled with a digital control module for exciting a gemstone;
an acoustic receiver electronically coupled with the digital control module, wherein the acoustic signal is being recorded for receiving the acoustic signals emitted from the excited testing gemstone and transferring the received acoustic signals to the digital control module;
the digital control module electronically coupled with the exciter, a storage module and the acoustic receiver respectively, for processing the received acoustic signal of the gemstone, and converting the acoustic signals into frequency response spectrum of the gemstone, and then sending to the storage module;
the storage module electronically coupled with the digital control module for receiving the frequency response spectrum of the gemstone from the digital control module; and
an identification module electronically coupled with the digital control module, wherein the identification module compares the received frequency response spectrum of the gemstone with the frequency response spectrum of the gemstone saved in the storage module, so as to identify and verify whether the gemstone is authentic.
2. The apparatus of claim 1 , wherein the acoustic receiver is a high-precision microphone.
3. The apparatus of claim 1 , wherein the exciter is an electromagnetic vibration exciter or a mechanical exciter.
4. The apparatus of claim 3, wherein the electromagnetic vibration exciter generates electromagnetic vibration by electric hammer or electromagnetic force.
5. The apparatus of claim 3, wherein the mechanical exciter generates mechanical vibration by mechanical or mechatronic system strike.
6. A method for identifying and verifying a gemstone, wherein the method is based on the frequency response spectrum of the gemstone.
7. The method of claim 6, wherein the method comprising a recording process of the frequency response spectrum of the gemstone, and an identifying and verifying process;
Wherein the recording process of the frequency response spectrum comprises the following steps:
Al : disposing the gemstone at a designated location;
step A2: generating an acoustic signal from an exciter to excite the gemstone, wherein the gemstone generates specific frequency signals after being excited;
step A3 : receiving the specific frequency signals by an acoustic receiver, and transferring the received specific frequency signals as acoustic signals to a digital control module; and
step A4: processing the acoustic signals by a digital control module into a frequency response spectrum, and then the frequency response spectrum is sent to a storage module; and
wherein the identifying and verifying process comprises the following steps: step B l : disposing the gemstone on the designated location;
step B2: generating an acoustic signal by an exciter to excite the gemstone, wherein the gemstone generates specific frequency signals after being excited; step B3: receiving the specific frequency signals by an acoustic receiver, and transferring the received specific frequency signals as acoustic signals to a digital control module;
step B4: processing the acoustic signals by the digital control module into a frequency response spectrum, and then the frequency response spectrum is sent to a storage module and a identification module; and
step B5: comparing the frequency response spectrum of the gemstone by the identification module with the frequency response spectrum saved in the recording step, thereafter the identification module identifies whether the gemstone needed identifying is the one that had been recorded in the storage module.
8. The method of claim 7, wherein the acoustic signal is processed into the frequency response spectrum by employing a converter to convert vibration signals into digital signals, or by applying Fast Fourier Transformation to convert acoustic signals into frequency signals, or by employing a filter to remove background noises.
9. The method of claim 7, wherein the acoustic signal is the time response curve or frequency response curve.
10. The method of claim 7, wherein the acoustic signals from the exciter during the recording process of the frequency response spectrum and the gemstone identifying process are the same.
PCT/CN2010/079996 2010-11-04 2010-12-20 Apparatus and method for identifying and verifying gemstone WO2012058842A1 (en)

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