The direct transmission technique is the most common method in measuring infrared spectrum of gemstone.
红外光谱仪已广泛地应用于宝石研究与鉴定，其中直接透射技术使用最广泛。
The infrared spectroscope has been widely used in gem research and identification. The direct transmission technique is the most common method in measuring infrared spectrum of gemstone.
红外光谱仪已广泛地应用于宝石研究与鉴定，其中直接透射技术使用最广泛。
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