Fabrication of Cheap Optical Transducers (CHOTs) on film carriers for in-situ application and generation of surface acoustic waves

13th Anglo-French Physical Acoustics Conference

Ageeva, V.^1 ; Stratoudaki, T.^1 ; Clark, M.^1 ; Somekh, M.G.^1

Electrical Systems and Optics Division, Faculty of Electrical and Electronic Engineering, University of Nottingham, Nottingham

NG7 2RD, United Kingdom^1

关键词: Aluminium samples;    Complex geometries;    Curved components;    Fabrication method;    Optical transducers;    Surface acoustic wave (SAW);    Surface acoustic waves;    Ultrasonic inspections;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/581/1/012010/pdf
DOI  :  10.1088/1742-6596/581/1/012010

来源: IOP

【 摘 要 】

Cheap optical transducers (CHOTs) are patterns on the surface of a component activated by lasers to generate and detect ultrasound. Excited optically, with minimal surface impact, and fully customizable, CHOTs provide a simple alternative to conventional piezoelectric transducers, offering wireless, remote operation. Of particular interest is application of CHOTs for in-situ ultrasonic inspection of hard-to reach and complex-geometry components such as those of aero-engines. A suitable fabrication method has been developed to allow in-situ application of CHOTs onto large size and curved components, as well as those already in service, challenging for current laboratory-based micro-patterning methods. This work describes the fabrication of a transferable g-CHOT for generation of ultrasound. The g- CHOT has been made on an SU8 carrier film using a sacrificial polystyrene layer, allowing the transducer to be transferred from the substrate and subsequently delivered and applied to the surface of the sample in-situ. The functionality of the fabricated transducer is demonstrated by detection of the Surface Acoustic Waves (SAW) generated by the g-CHOT transferred onto glass and aluminium samples.