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29 July 2015 Development of near infrared spectrometer for gem materials study
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Proceedings Volume 9659, International Conference on Photonics Solutions 2015; 96591B (2015) https://doi.org/10.1117/12.2195813
Event: International Conference on Photonics Solutions 2015, 2015, Hua Hin, Thailand
Abstract
Most of gem materials can be characterized by infrared absorption spectroscopy. Normally, mid infrared absorption technique has been applied for investigating fundamental vibrational modes. However, for some gem materials, such as tourmaline, NIR is a better choice due to differentiation. Most commercial NIR spectrometers employ complicated dispersive grating or Fourier transform techniques. In this work, we developed a filter type NIR spectrometer with the availability of high efficiency and low-cost narrow bandpass NIR interference filters to be taught in a physics laboratory. The instrument was designed for transmission-mode configuration. A 50W halogen lamp was used as NIR source. There were fourteen NIR filters mounted on a rotatory wheel for wavelength selection ranging from 1000-1650 nm with steps of 50 nm. A 1.0 mm diameter of InGaAs photodiode was used as the detector for the spectrometer. Hence, transparent gem materials can be used as samples for experiment. Student can learn vibrational absorption spectroscopy as well as Beer-Lambert law from the development of this instrument.
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W. Jindata, W. Meesiri, and W. Wongkokua "Development of near infrared spectrometer for gem materials study", Proc. SPIE 9659, International Conference on Photonics Solutions 2015, 96591B (29 July 2015); https://doi.org/10.1117/12.2195813
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