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激光光声光谱(PAS,PhotoAcousticSpectroscopy)检测技术
激光光声光谱检测技术是一种基于光声效应的光谱检测方法。 一、基本原理 当物质吸收周期性调制的光能量后,会以热的形式将光能转化为热能,导致物质温度周期性变化。由于热胀冷缩,这种温度变化会引起物质体积的周期性变化,从而产生压力波,即声信号。
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Marks first year of 2nd term
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