Tip sample distance control system is the key part of scanning near field infrared microscopy.

针尖样品的距离控制系统是扫描近场红外显微镜的重要组成部分。

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This formula is not limited by the aperture radius and the distance from the screen and can be used as a theory of near field optics.

推导了圆孔衍射公式，该公式不受孔径大小和到屏距离的限制，可以作为近场光学的理论。

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The sound pressure at near distance under free field was computed by using the wave number integration and the basic characteristics of the radiated noise were analyzes.

利用波数积分方法仿真计算了该模型在自由场条件下的近程声场，并分析了近场辐射噪声的基本规律。

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