本发明是一种用于表征液体样品（20）的方法，所述样品包括浸入液体介质（22）中的颗粒，所述方法包括以下步骤：a）借助于 光源（11），适于向所述样品发射入射光波（12）; b）借助于光检测器（30）检测由如此照射的样品透射的光波（14）; c）将样品表征为由光电检测器检测到的光波强度的函数。 该方法包括在步骤c）之前在样本中施加声波（45），样本中的所述声波形成压力节点（46）和压力腹部（47） ，以便在后者中分离颗粒耗尽部分和富含颗粒的部分，阶段c）包括从耗尽部分透射的光波的强度表征液体介质。

The invention is a method of characterizing a liquid sample (20), said sample comprising particles immersed in a liquid medium (22), the method comprising the steps of:
a) illuminating said sample with a light source (11) capable of emitting an incident light wave (12) toward the sample;
b) detecting, with the aid of a photodetector (30), a light wave (14) transmitted by the sample thus illuminated;
c) Sample characterization according to an intensity of the light wave detected by the photodetector. The method comprises, prior to step c), an application of an acoustic wave (45) in the sample, said acoustic wave pressure forming nodes (46) and pressure antinodes (47) in the sample , so as to separate, in the latter, a depleted portion and a particle enriched portion particles, step c) comprising the characterization of the liquid medium from the intensity of the light wave transmitted through the depleted portion.