超声波的产生----外文翻译.doc
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超声波的产生----外文翻译,the sound wave is the object mechanical vibrations condition (or energy) dissemination form. the so-called vibration is refers to material the particle the reci...
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The sound wave is the object mechanical vibrations condition (or energy) dissemination form. The so-called vibration is refers to material the particle the reciprocating motion which carries on nearby its position of equilibrium. For example, drum surface after rap, it on high and low vibrates, this kind of vibrational state to disseminates in all directions through the air medium, this is a sound wave. The ultrasonic wave is refers to the vibrational frequency to be bigger than above 20KHz, its each second vibration number of times (frequency) very high, has surpassed the person ear sense of hearing upper limit (20000Hz), people sound wave named ultrasonic wave which cannot hear this kind. Supersonic and may Wen Sheng be essentially consistent, their common ground is one kind of mechanical vibrations, usually will disseminate by the longitudinal wave way in the elastic medium, will be one kind of energy dissemination form, its diversity will be the ultrasonic frequency is high, the wave length, will have the good beam in certain distance along the straight line dissemination and the directivity, at present the abdomen supersonic image formation will use the frequency range in 2~5MHz, (will vibrate 1 time for 3~3.5MHz each second is 1Hz,1MHz=106Hz commonly used, namely each second will vibrate 1,000,000 times, but Wen Bo frequency between 16-20000HZ).
Two main parameters about ultrasonic wave:
Two main parameters about ultrasonic wave are: Frequency: F≥20KHz; Power density: p= emissive power (W)/emitting area (cm2); Usually p≥0.3w/cm2; The supersonic wave energy which disseminates in the liquid carries on the clean to the object surface's contamination, its principle available
声波是物体机械振动状态（或能量）的传播形式。所谓振动是指物质的质点在其平衡位置附近进行的往返运动。譬如，鼓面经敲击后，它就上下振动，这种振动状态通过空气媒质向四面八方传播，这便是声波。 超声波是指振动频率大于20KHz以上的,其每秒的振动次数（频率）甚高，超出了人耳听觉的上限（20000Hz），人们将这种听不见的声波叫做超声波。超声和可闻声本质上是一致的，它们的共同点都是一种机械振动，通常以纵波的方式在弹性介质内会传播，是一种能量的传播形式，其不同点是超声频率高，波长短，在一定距离内沿直线传播具有良好的束射性和方向性，目前腹部超声成象所用的频率范围在 2~5MHz之间，常用为3~3.5MHz（每秒振动1次为1Hz，1MHz=106Hz，即每秒振动100万次，可闻波的频率在16－20000HZ 之间）。
超声波的两个主要参数：
超声波的两个主要参数：频率：F≥20KHz；功率密度：p=发射功率(W)/发射面积(cm2)；通常p≥0.3w/cm2；在液体中传播的超声波能对物体表面的污物进行清洗，其原理可用“空化”现象来解释：超声波振
Two main parameters about ultrasonic wave:
Two main parameters about ultrasonic wave are: Frequency: F≥20KHz; Power density: p= emissive power (W)/emitting area (cm2); Usually p≥0.3w/cm2; The supersonic wave energy which disseminates in the liquid carries on the clean to the object surface's contamination, its principle available
声波是物体机械振动状态（或能量）的传播形式。所谓振动是指物质的质点在其平衡位置附近进行的往返运动。譬如，鼓面经敲击后，它就上下振动，这种振动状态通过空气媒质向四面八方传播，这便是声波。 超声波是指振动频率大于20KHz以上的,其每秒的振动次数（频率）甚高，超出了人耳听觉的上限（20000Hz），人们将这种听不见的声波叫做超声波。超声和可闻声本质上是一致的，它们的共同点都是一种机械振动，通常以纵波的方式在弹性介质内会传播，是一种能量的传播形式，其不同点是超声频率高，波长短，在一定距离内沿直线传播具有良好的束射性和方向性，目前腹部超声成象所用的频率范围在 2~5MHz之间，常用为3~3.5MHz（每秒振动1次为1Hz，1MHz=106Hz，即每秒振动100万次，可闻波的频率在16－20000HZ 之间）。
超声波的两个主要参数：
超声波的两个主要参数：频率：F≥20KHz；功率密度：p=发射功率(W)/发射面积(cm2)；通常p≥0.3w/cm2；在液体中传播的超声波能对物体表面的污物进行清洗，其原理可用“空化”现象来解释：超声波振
