Photoacoustic generation using WS2 in ultrasonic detection of seismic physical models

Abstract

The photoacoustic generation in tungsten disulfide (WS2) films based on photoacoustic effect is proposed and experimentally demonstrated. WS2 films, fabricated by liquid exfoliation technique, are characterized by x-ray diffraction (XRD), Raman spectroscopy and ultraviolet-visible (UV–vis) absorption spectroscopy. The laser power and the amount of WS2 during films formation are the two key factors in photoacoustic generation of WS2. With the increasing of laser power, the photoacoustic signals in WS2 are enhanced correspondingly. Similarly, increasing the supernatant volume filtered through the membrane increases the photoacoustic output. Based on the high efficiency of photoacoustic transformation, WS2 films are expected to replace the electrical ultrasonic transducer and act as a photoacoustic transducer, finally realizing an all-fiber ultrasonic detection system of seismic physical models.