Madelin Guillaume, Hosten Bernard, Biateau Christine, Mougenot Charles, Franconi Jean-Michel, Thiaudière Eric
Laboratoire de Résonance Magnétique des Systèmes Biologiques, UMR 5536, CNRS, Université de Bordeaux 2, 146 rue Léo Saignat, case 93, 33076 Bordeaux cedex, France.
Ultrasonics. 2005 Oct;43(9):769-74. doi: 10.1016/j.ultras.2005.04.001.
The aim of this paper is to compare two different methods for the calculation of the ultrasonic output power of underwater transducers: the radiation force balance, which is the standard method, and the laser heterodyne interferometry, which is rather used to depict displacement or velocity distributions of the acoustic field. Here it is shown that the latter can also be used to calculate the acoustic time-average power with an uncertainty of about 22%, the radiation force balance giving an uncertainty of 12% (with 95% confidence). The interferometry experiments performed with two transducers working at 2.25 MHz and 8.25 MHz showed that they produce different acoustic fields (respectively Gaussian and Lorentz-sigmoidal distributions). Taking into account the acoustic field profiles, the acoustic time-average power from interferometry was calculated. It was found very similar to the time-average power measured with the radiation force balance in the plane-wave assumption.
标准方法辐射力平衡法，以及常用于描绘声场位移或速度分布的激光外差干涉测量法。本文表明，后者也可用于计算声时平均功率，不确定度约为22%，而辐射力平衡法的不确定度为12%（置信度为95%）。对工作在2.25 MHz和8.25 MHz的两个换能器进行的干涉测量实验表明，它们产生不同的声场（分别为高斯分布和洛伦兹-西格玛分布）。考虑到声场分布，计算了干涉测量法得到的声时平均功率。结果发现，在平面波假设下，该功率与用辐射力平衡法测得的时平均功率非常相似。
