Development of a New Multi-spectral Induced Luminescence Imaging System (GV5000) and Its Application in Screening Melee-sized Near-colorless Synthetic Diamonds and Natural Diamonds
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摘要: 天然钻石中普遍含有聚合氮以及复杂的生长结构，而合成钻石不含氮或含少量单氮并有典型的与合成条件有关的生长结构，利用此类性质可对天然和合成钻石进行区分。但对粒度细小或镶嵌复杂的钻石样品进行检测时，现有仪器由于局限性难以实现有效测量。本文研制了一种新型宝石发光性测试装置——宽频诱导发光测试仪（GV5000），通过对激发光源和滤光片、结构设计和测试方式的研发，实现了可同时观察多个小颗粒样品（最小为0.002 ct）的荧光特征和磷光特征，建立了一种以发光特征差异性作为筛分条件快速、准确筛分无色小颗粒天然钻石和合成钻石的分析方法。应用本方法测试了9015粒样品，并通过红外光谱、光致发光光谱等方法对筛查结果进行验证，表明97%的天然钻石具有蓝白色荧光并无磷光，而合成钻石的发光特征明显区别于天然钻石。本方法避免了样品大小和形状的影响，提高了小颗粒钻石鉴定的准确度和检测效率，对天然钻石的筛查率可达97%，对合成钻石的筛查率可达100%。
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关键词:
- 宽频诱导发光测试仪(GV5000) /
- 荧光 /
- 磷光 /
- 小颗粒无色合成钻石 /
- 金刚石
Abstract: Natural diamonds commonly contain polymeric nitrogen and have complex growing textures, whereas synthetic diamonds do not contain nitrogen or do contain single nitrogen and have typical growing textures related to the synthetic process. Using these characteristics, natural and synthetic diamonds can be distinguished. However, effective identification on melee-sized diamonds or mounted jewelry is not feasible by conventional instruments. A multi-spectral induced luminescence imaging system, GV5000 has been invented, and is described in this paper. Through improving the excitation light source, the light filter, the device configuration, and testing methods, the fluorescence and phosphorescence features of multiple melee-sized diamonds (≥0.002 ct) can be observed simultaneously. An efficient and precise method to identify colorless melee-sized natural and synthetic diamonds on the basis of the luminescent characteristics has also been established. 9015 samples were analyzed by GV5000 and screening results were checked by infrared spectroscopy, and photoluminescence spectroscopy, 97% of the natural diamonds display blue fluorescence without phosphorescence. Moreover, the luminescence of synthetic diamonds is different from that of natural ones. This new method erases the influences of size and shape of samples and increases the accuracy and efficiency of the identification on melee-sized diamonds. The screening rates of natural and synthetic diamonds are as high as 97% and 100%, respectively. -
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