Raman spectrum gem and jade appraising device and method

Abstract

A Raman spectrum gem and jade appraising device and a method are provided. The device comprises a power source, an optical part and a data analysis and control module. The optical part comprises a laser excitation power source, a laser, a reflector path, a high-voltage power source, a photomultiplier, a monochromator and a photon counter. The data analysis and control module comprises a general control drive, a computer and a display. The method includes fixing a sample to be detected to a sample rack in the reflector path, supplying power to the laser through the laser excitation power source to generate polarized laser, performing collimation, refraction and condensation processing through the reflector path to obtain an intensive laser beam, irradiating the sample to be detected to excite internal molecules of the sample to be detected to generate energy level transition to generate Raman shift so as to obtain scattered light, collecting and processing by the monochromator to generate spectral signals, converting into electric pulses through the photomultiplier, amplifying and counting through the photon counter to obtain spectrum information, inputting into the computer, processing, and displaying a result through the display. The device and the method can appraise gem and jade in a nondestructive, accurate and standardized manner.

Description

technical field [0001] The invention relates to the technical field of gem identification, in particular to a Raman spectrum gem identification device and method. Background technique [0002] With the improvement of the living standards of the domestic public in recent years, the jewelry market has gradually shown its good development trend. As the main component of the jewelry industry, gemstones occupy a large proportion in the market, and their formal identification and grading have also become market transactions. An important guarantee of fairness and stability. The concept of gemstones in gemology has a broad sense and a narrow sense. In a broad sense, gems and jade are not distinguished, and generally refer to gems, which refer to minerals or rocks that are magnificent in color, hard and durable, rare, and can be polished and carved into jewelry and handicrafts, including natural and synthetic, as well as some organic materials . In the narrow sense, there are gem...

AI Technical Summary

Problems solved by technology

At present, the identification of gems and jade mainly relies on the long-term experience of professional appraisers, with the help of magnifying glasses, refractometers, microscopes, hydrometers and other non-destructive tools. However, the development of high-tech in recent years has made various artificial gems, synthetic gems and Optimized gem varieties have flooded into the jewelry market. Synthetic gems that have undergone artificial treatments such as coloring and filling have the same chemical composition, and even the same molecular crystal structure and physical properties as natural gems, so it is difficult to use conventional identification. means to precisely distinguish them from natural gemstones

The disadvantages of the existing gem identification instruments are: the current identification of gems and jades requires a variety of tools to cooperate with the identification, and the process is complicated; the existing identification equipment cannot identify some high-quality imitations to a certain extent; The traditional method relies too much on experience, and human subjective judgment occupies a large share in the identification; the use of traditional color filters for some gemstones, the color is not obvious enough, such as the change of dyed quartzite under the color filter. Difficult to observe; the 10x magnifying glass has some shortcomings in the observation of gemstone texture filled with high precision, and can only be judged by simple naked eyes; ultraviolet fluorescent lamps can achieve the identification effect for most gemstones, but some gemstones such as sapphire are not fluorescent and cannot be detected. identify

Images