Development of UV-Vis-NIR-MIR absorption spectroscopy for gemstone analysis

Zhen Wang; Hiroshi Takahashi

doi:10.1117/12.2624632

3 October 2022 Development of UV-Vis-NIR-MIR absorption spectroscopy for gemstone analysis

Zhen Wang, Hiroshi Takahashi

Proceedings Volume 12216, Novel Optical Systems, Methods, and Applications XXV; 122160R (2022) https://doi.org/10.1117/12.2624632
Event: SPIE Optical Engineering + Applications, 2022, San Diego, California, United States

Conference Poster

Abstract

Ultraviolet-visible (UV-Vis) absorption spectroscopy has been widely exploited by the gemstone industry, as it can be used to identify natural and synthetic gemstones, type of gemstone, and the origin of their color, all using a non-destructive method. Current spectrometers for gemstone identification capture required spectral information, however, they have a few noticeable disadvantages: it is difficult to customize the setup (adding fluorescence/LED illumination, implementing new software functions to capture time series data etc.), they can have long measurement times, and high maintenance cost. Due to these reasons, we have designed a UV-Vis absorption spectrometer that can capture spectra from 220 nm to 990 nm, with a measurement time up to 10 seconds. The device can be used to measure both loose/mounted gemstones, with almost no sample size limitation. They have been installed globally for diamonds, colored stones and pearl production. Several new options are currently being developed for the current unit: new software functions such as time series spectra measurements and hardware updates specifically for diamond treatments and coating detection. Besides the UV-Vis wavelength range, a new approach is to further extend the current wavelength range (up to 990 nm) to the Near-Infrared (NIR) – Mid-Infrared (MIR) range (up to 5μm). Spectrometers based on up-conversion phenomenon of non-linear crystal have been utilized for this research. The target for this development is towards quick and easy operated gemstone screening.

Citation Download Citation

Zhen Wang and Hiroshi Takahashi "Development of UV-Vis-NIR-MIR absorption spectroscopy for gemstone analysis", Proc. SPIE 12216, Novel Optical Systems, Methods, and Applications XXV, 122160R (3 October 2022); https://doi.org/10.1117/12.2624632

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