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聲放射力

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聲放射力(英語:Acoustic radiation force)( ARF )是一種聲學現象,當聲波遇到障礙物時,與此物體產生交互作用,變產生了聲放射力。通常,施加在障碍物上的力是通过对其时变表面上的声辐射压力(由于声波的存在)进行积分来评估的。

公式

声放射力的大小可以由以下公式得出:

其中:

  • 是每单位体积的力,單位是kg/(s2cm2);
  • 吸收系数,单位为Np/cm (Neper/cm);
  • 是给定位置的声波强度,單位為W/cm2
  • 介质中的聲速,单位为cm/s。[1][2]

不同頻率下的聲波產生的聲放射力不同,越高頻率的吸收係數越大,然而聲波強度則越小。水的吸收係數為 0.002dB/(MHz2cm) [3]氣泡受到聲放射力影響時,會有聲致發光現象。[4]

參考來源

  1. ^ Palmeri, Mark; Sharma, Amy; Bouchard, Richard; Nightingale, Roger; Nightingale, Kathryn. A finite-element method model of soft tissue response to impulsive acoustic radiation force. IEEE Trans Ultrason Ferroelectr Freq Control. October 2005, 52 (10): 1699–1712. PMC 2818996可免费查阅. PMID 16382621. doi:10.1109/tuffc.2005.1561624. 
  2. ^ McAleavey, S. A.; Nightingale, K. R.; Trahey, G. E. Estimates of echo correlation and measurement bias in acoustic radiation force impulse imaging. IEEE Trans Ultrason Ferroelectr Freq Control. June 2003, 50 (6): 631–641. PMID 12839175. S2CID 12815598. doi:10.1109/tuffc.2003.1209550.  需付费查阅
  3. ^ Szabo, Thomas L. Diagnostic ultrasound imaging: inside out 2nd. Academic press. 2013 [2021-12-06]. ISBN 9780126801453. (原始内容存档于2021-12-06). 
  4. ^ Leighton, T.G.; Walton, A.J.; Pickworth, M.J.W. Primary Bjerknes forces. European Journal of Physics. 1990, 11 (1): 47. doi:10.1088/0143-0807/11/1/009. 


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聲放射力
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