当物质受到周期性强度调制的光照射时，产生声信号的现象。用光照射某种媒质时，由于媒质对光的吸收会使其内部的温度改变从而引起媒质内某些区域结构和体积变化；当采用脉冲光源或调制光源时，媒质温度的升降会引起媒质的体积涨缩，因而可以向外辐射声波。这种现象称为光声效应（photoacoustic effect）。
It is a new method that detecting the content of carbon in fly ash by photoacoustic effect.
应用光声效应来检测粉煤灰中碳的含量是一种全新的碳检测技术。
参考来源 - 利用光声效应的粉煤灰中未燃烧碳的含量检测仪器的研制Photoacoustic effect of solid state was analyzed by acoustic excitated and laser excitated ultrasonic in the paper based on one dimension changed temperature field, and photoacoustic effect of biological tissue(spinach leaf tissue, fowl liver tissue) was analyzed through experiements.
本文以一维交变温度场的固体光声效应为理论基础,从声激发和激光激发超声两个方面分析了固体光声效应,并对生物组织(菠菜叶片组织和鸡的肝脏组织)的光声效应进行了实验研究。
参考来源 - 基于光声效应的生物组织光谱特性研究·2,447,543篇论文数据，部分数据来源于NoteExpress
粉煤灰光声效应的产生源于粉煤灰材料对入射调制光能量的吸收。
The photo-acoustic effect results from the absorption of modulated light energy.
以固体光声效应的RG理论为依据，用光声法测量了压电陶瓷材料PZT的热参量。
According to the RG theory of the photoacoustic effect with solids, the thermal parameters of PZT ceramic material have been measured by using photoacoustic method.
以光声效应的基本原理为理论基础，介绍了应用光场效应检测粉煤灰中碳含量的研究及仪器的结构设计。
By combine fundamental principle of photoacoustic response, the measuring unburnt carbon in fly ash by photoacoustic response is studied, and the instrument design is introduced.
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