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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Bubble sizing with high spatial resolution
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Bubble sizing with high spatial resolution

机译：具有高空间分辨率的气泡大小

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The authors propose a technique that allows them to size bubbles with the same accuracy as with the double-frequency method and to locate them with the same range resolution as with the pulsed Doppler velocimeter. They demonstrate that the signal scattered by the bubble insonified by a high-frequency pulsed ultrasonic field and a low-frequency pumping field is a low-frequency signal sampled at the repetition frequency rate and in which the amplitude is maximum when the bubble resonates. However using a conventional Doppler flowmeter, the maximum amplitude is not detectable when the repetition frequency is a multiple of the pump frequency. The modifications of the signal processing needed to overcome this drawback are discussed and implemented in the conventional Doppler flowmeter. Using this modified setup the lateral and the longitudinal range resolution are the same as in conventional Doppler flowmeters. The resonance frequency thus obtained is also compared to the resonance frequency measured by the double Doppler frequency method. Some practical improvements are proposed to make the system easy to use. Using this latest version, the resonant requencies for ten different bubble sizes are measured and compared. The case in which the nonlinearity effect (due to a bubble at resonance) generates out-of-phase upper and lower sidebands is discussed, and it is demonstrated that this effect is so feeble that it is negligible.
机译：作者提出了一种技术，该技术可以使气泡以与双频方法相同的精度进行大小调整，并以与脉冲多普勒测速仪相同的范围分辨率进行定位。他们证明，由高频脉冲超声场和低频泵浦场声波的气泡散射的信号是以重复频率采样的低频信号，当气泡共振时振幅最大。但是，使用常规的多普勒流量计，当重复频率是泵频率的倍数时，最大振幅是无法检测到的。克服此缺点所需的信号处理修改已在常规多普勒流量计中讨论和实施。使用此修改后的设置，横向和纵向量程分辨率与常规多普勒流量计相同。将如此获得的谐振频率也与通过双多普勒频率法测量的谐振频率进行比较。为了使该系统易于使用，提出了一些实际的改进。使用此最新版本，可以测量和比较十种不同气泡大小的共振频率。讨论了非线性效应（由于共振时的气泡引起）产生异相的上，下边带的情况，并且证明了这种效应微弱到可以忽略不计。

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