Capeloto Otávio A, Zanuto Vitor S, Camargo Vinicius G, Flizikowski Gabriel A S, Lukasievicz Gustavo V B, Herculano Leandro S, Belançon Marcos P, Astrath Nelson G C, Malacarne Luis C
Appl Opt. 2020 Apr 20;59(12):3682-3685. doi: 10.1364/AO.389545.
We use the thermal lens technique in the nanosecond time scale to describe the acoustic wave effect in liquids and the corresponding correlation with the speed of sound in the fluid, volumetric thermal expansion, and piezo-optic coefficient. These physical properties are found to be directly correlated to the anomalous effects observed in the transients at the nanosecond time scale, where acoustic waves dominate the thermal lens signal inducing an oscillating transient. Our results suggest the application of the thermal lens to study the generation and the detection of thermo-acoustic waves in liquids, which makes this method interesting for all-optoacoustic ultrasound detection and imaging.
我们使用纳秒时间尺度的热透镜技术来描述液体中的声波效应，以及与流体中的声速、体积热膨胀和压光系数的相应相关性。发现这些物理性质与在纳秒时间尺度的瞬态中观察到的异常效应直接相关，在该时间尺度下，声波主导热透镜信号并诱导出振荡瞬态。我们的结果表明热透镜可用于研究液体中热声波的产生和检测，这使得该方法对于全光声超声检测和成像很有意义。
