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3.提高成像性能的技术声成像,由于声波的波长与光的波长比较长10~4～10~5倍左右,没有像光学底片或撮像管那样高灵敏度、高分辨力的面检测器等等,所以,一般说来所得到的图像质量不佳。且,在利用声波时,可直接检测相位,因此,成像系统的自由度大。由于具有这些声响撮像的特殊性,过去为提高成像性能做过种种尝试。本章将这样的技术分类为发声方式,接收发射、图像形成及图像处理作一概述。
3. Improve the performance of imaging imaging technology, the wavelength of the sound wave and the light wavelength of 10 ~ 4 ~ 10 ~ 5 times longer, there is no optical film or photographic tube as high sensitivity, high resolution surface detector and so on , So, in general, the resulting image quality is poor. Moreover, the phase can be directly detected when utilizing sound waves, and therefore the degree of freedom of the imaging system is large. Due to the special nature of these acoustic images, various attempts have been made in the past to improve imaging performance. This chapter classifies such techniques as vocalization, receive emission, image formation, and image processing.