Inspecting multilayered airspace structures using ultrasonic narrowband spectroscopy

Tadeusz Stepinski; Marcus Jonsson

doi:10.1117/12.599069

19 May 2005 Inspecting multilayered airspace structures using ultrasonic narrowband spectroscopy

Tadeusz Stepinski, Marcus Jonsson

Proceedings Volume 5767, Nondestructive Evaluation and Health Monitoring of Aerospace Materials, Composites, and Civil Infrastructure IV; (2005) https://doi.org/10.1117/12.599069
Event: Nondestructive Evaluation for Health Monitoring and Diagnostics, 2005, San Diego, CA, United States

Abstract

Recently, an increased need for effective NDE tools for layered structures has been observed with the increased use of bonded structures (e.g. GLARE) and carbon fiber reinforced panels (CFRP) in modern aircraft constructions. NDE of multilayered airspace structures can be performed using ultrasonic spectroscopy which makes use of the information in the frequency domain generated due to the constructive and destructive interference of elastic waves. The paper presents a novel narrowband ultrasonic spectroscopy (NBS) technique which utilizes specially designed resonance transducers with carefully selected narrow frequency bands. The NBS is based on sensing electrical impedance of the piezoelectric transducer in the vicinity of its resonance. The theoretical model which enables predicting the resonance frequencies and modal shapes of the thickness mode resonances occurring in multi-layered structures is presented in the first part of the paper. The model includes the KLM equivalent circuit of a piezoelectric transducer used for sensing the resonances. Theoretical and experimental results are presented showing the relation of the impedance plane indications to the parameters of adhesive in aluminum sandwich structures. Results of the mechanized inspection CFRP specimens are presented in the second part of the paper.

Citation Download Citation

Tadeusz Stepinski and Marcus Jonsson "Inspecting multilayered airspace structures using ultrasonic narrowband spectroscopy", Proc. SPIE 5767, Nondestructive Evaluation and Health Monitoring of Aerospace Materials, Composites, and Civil Infrastructure IV, (19 May 2005); https://doi.org/10.1117/12.599069

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available