Abstract
With excellent thermal conductivity and unique two-dimensional structure, the graphene heat dissipation film (GHDF) has been a potential photoacoustic (PA) material for multiple applications. In this study, we apply the GHDF into laser ultrasonic detection of seismic physical model (SPM). The PA effect of the GHDF is theoretically analyzed and experimentally demonstrated. The GHDF is physically attached to the upper surface of SPM, and excited effectively by a 532 nm pulsed laser. Distinguishable layered echo signal of SPM verifies the feasibility of the ultrasonic excitation approach using GHDF. This work opens up a new application of GHDF in ultrasonic detection of SPM.
Highlights
Seismic physical model (SPM) is an important method to study the propagation of elastic wave in laboratory [1] The ultrasonic transducer receives the reflected signal inside SPM and the 3D model is reconstructed according to inversion algorithm [2]
The conventional ultrasonic source excited by piezoelectric transducers (PZTs) has narrow transmitting frequency and low coupling efficiency, which is not suitable for high resolution detection of SPM [3]
When the laser power is set in the damage threshold range of the film, the signal amplitude increases with the laser power
Summary
Seismic physical model (SPM) is an important method to study the propagation of elastic wave in laboratory [1] The ultrasonic transducer receives the reflected signal inside SPM and the 3D model is reconstructed according to inversion algorithm [2]. A method of using photoacoustic (PA) effect to excite broadband ultrasonic waves for detection, has been widely used in nondestructive testing [4]. Its unique two-dimensional crystal structure provides good mechanical strength and thermal conductivity. The excellent thermal conductivity and unique two-dimensional structure of graphene makes it an ideal candidate for heat dissipation films of chips and various electronic devices [8]. The graphene heat dissipation film (GHDF) includes graphene film and reduced graphene oxide film [9]. It has good PA effect, and can be expanded in a large area with excellent flexibility, which is a high-quality PA material for ultrasonic detection of SPM in this work
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