发明名称 |
Examination method for distinguishing between natural diamond and synthetic CVD/HPHT diamonds |
摘要 |
This invention is within the technical field of distinguishing between natural diamond and synthetic CVD and HPHT diamonds, involves an examination technique using the Raman spectra. Procedurally, a highly sensitive Raman spectrometer (S/N>10,000) is used to scan and examine the diamond sample. The spectrometer is fitted with a tailor-made probe that has a large facula and surface area. Specially developed software is then used to perform an intensity correction and a background elimination to obtain a specific Raman spectral range (250-2800 cm−1) with the corrected intensity and a smooth baseline. Next, the Raman peak intensity of 2030 cm−1 (the post-correction and -standardization characteristic peak) is used as a basis to distinguish between natural diamond and synthetic CVD and HPHT diamonds. This method has the advantages of being non-destructive, simple, fast, and practical identification for diamonds. |
申请公布号 |
US9581553(B2) |
申请公布日期 |
2017.02.28 |
申请号 |
US201514838377 |
申请日期 |
2015.08.28 |
申请人 |
Pan Dong-Shyogn |
发明人 |
Pan Dong-Shyogn |
分类号 |
G01N21/87;G01N21/65;G01N33/38 |
主分类号 |
G01N21/87 |
代理机构 |
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代理人 |
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主权项 |
1. An examination method for distinguishing between natural and synthetic CVD/HPHT diamonds, comprising:
providing a Raman spectrometer having a laser beam of wavelength 785 nm and total laser energy of 450 mW for an average detection of diamond surfaces; three continuous scans being performed using a tailor-made probe having a large facula and surface area to obtain three spectra, from which an average Raman spectra is determined; defining a collection range of the spectrometer as 250-2800 cm−1; and after the collection of the Raman spectral data, the intensity being subjected to two operations: (a) correction and standardization, and (b) background elimination that result in a Raman spectrogram with a smooth baseline and a calibrated intensity; wherein a carbon Raman characteristic peak for diamonds occurs at 1332 cm−1, whereas natural diamonds have an extra nitrogen-derived Raman characteristic peak at 2030 cm−1. |
地址 |
Taipei TW |