1) three-dimensional acoustic intensity
三维声强
1.
The formula of the sound field separation technique based on measurement of the three-dimensional acoustic intensity with single holographic plane was established according to the superposition theory of particle velocity and the Euler equation in wave number domain, and the acoustic pressure caused by the sound sources on one side of holo.
在测量全息面三维声强和均方声压的基础上,根据平面上二维切向有功声强与复声压相位间的关系来间接获取复声压的相位,结合测得的均方声压,得到全息复声压;根据全息面上微粒法向振速的叠加原理和波数域的 Euler公式,推导出基于单全息面三维声强测量的声场分离公式,将全息面两侧声源各自在全息面上产生的声压分离开来。
2) 3-D sound intensity probe
三维声强探头
3) 3D and contour maps
三维声强与等值线图
4) two-dimensional sound intensity
二维声强
1.
Aimed at facilitating recognition and location of noise source,this paper proposes the physical model of the new two-dimensional sound intensity probe based on the two-microphone cross-spectral method and offers algorithms for two dimensional sound intensity.
为便于识别和定位平面内噪声源,依据双传声器互谱声强法原理,建立二维矢量声强探头的物理模型,推导了二维声强的计算公式,分别在单极子和偶极子声场条件下,利用该探头测量二维声强及定位误差。
5) 3-D sonogram
三维声图
6) 3D ultrasound
三维超声
1.
3D Ultrasound System for US-guided Intervention Therapy;
用于超声引导介入治疗的三维超声系统
2.
Design and implementation of 3D ultrasound system and its diagnostic application;
三维超声软件系统Ultra 3D~(TM)的设计及临床应用
3.
Detection of gastric emptying of gastroparesis syndrome in diabetic patients with 3D ultrasound
三维超声检测糖尿病胃轻瘫患者胃排空功能的研究
补充资料：声强级
某点声强i与基准声强i0之比的常用对数乘以10。即声强级li=10lgii0。单位为分贝。式中基准声强为10-12瓦/米2，是人耳刚能产生听觉的最弱声音，其声强级为零分贝。轻声交谈时的声强级约为10～20分贝，打雷、放炮时的声强级可达110～120分贝。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条