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声波频率在 16Hz-20kHz 之间

网址:www.com-to-com.com  2022-10-27  作者:admin    阅读:

声波频率在 16Hz-20kHz 之间,是能为人耳所闻的机械波;次声波就是频率低于16 Hz 的机械,而波超声波则是频率高于20kHz的机械波 。
The frequency of sound wave is between 16Hz and 20kHz, which can be heard by human ears; Infrasonic wave is a mechanical wave whose frequency is lower than 16 Hz, while ultrasonic wave is a mechanical wave whose frequency is higher than 20 kHz.
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超声波的特性是频率高、波长短、绕射现象小。它最显著的特性是方向性好,且在液体、固体中衰减很小,穿透本领大,碰到介质分界面会产生明显的反射和折射,因而广泛应用于工业检测中。
The characteristics of ultrasonic wave are high frequency, short wavelength and small diffraction phenomenon. Its most remarkable characteristics are good directionality, small attenuation in liquid and solid, high penetration, and obvious reflection and refraction when touching the interface of medium, so it is widely used in industrial detection.
超声波的传播速度:超声波通常有纵波、横波及表面波,他们的传播速度,取决于介质的弹性常数及介质密度。气体和液体中只能传播纵波,气体中声速为344m/s,液体中声速为900-1900m/s。在固体中,纵波、横波和表面波三者的声速成一定关系。通常可认为横波声速为纵波声速的一半,表面波声速约为横波声速的90% 。
Propagation speed of ultrasonic wave: ultrasonic wave usually has P-wave, S-wave and surface wave. Their propagation speed depends on the elastic constant and density of medium. The velocity of sound in gas and liquid is 344M / s and 900-1900m / s respectively. In solids, the velocities of P-wave, S-wave and surface wave are related to each othertuijian:dianzugui.37ix.com.cn www.dianzugui58.com www.jiedixiang58.com
www.hupomuju.cn www.zhenxinmoju.com www.tongdiaoniu.com.cn www.zhihongmuju.cn. It is generally considered that the velocity of S-wave is half of that of P-wave, and that of surface wave is about 90% of that of S-wave.
超声波在介质中传播时,随着传地变电阻柜 精密铸造 中频电炉设备 保定断桥铝门窗 保定养老院 镜子批发 启闭机播距离的增加,能量逐渐衰减。能量的衰减决定于超声波的扩散、散射和吸收。
When the ultrasonic wave propagates in the medium, the energy gradually decreases with the increase of the propagation distance. The attenuation of energy depends on the diffusion, scattering and absorption of ultrasound.

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