声密度 meaning in Chinese

sound density

Acoustics - determination of sound power levels of noise sources using sound intensity - part 2 : measurement by scanning
声学.用声密度测定噪声源的声能级.第2部分:扫描法测定
Acoustics - determination of sound power levels of noise sources using sound intensity - part 1 : measurement at discrete points
声学.用声密度测定噪声源的声功率级.第1部分:不连续点的测量