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.
了解电声器件的相位特性对有源消声控制器的设计及消声效果分析具有重要作用。
It is important to understand the phase characteristics of electro-acoustic device for the design and effect analysis of active noise cancellation controller.
戏中只有一点打动了观众：那就是它的雷声效果比以往任何一部舞台剧中的雷声效果都来得逼真，这是由丹尼斯自己设计的。
Only one element of the production stirred the audience: thunder sound effects more realistic than any heard before on the stage, effects that Dennis himself created.
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