Multi-frequency excitation based full-field laser scanning for improved depth estimation (Conference Presentation)

Seong Jin Im; JunYoung Jeon; Gyuhae Park; To Kang; Soon Woo Han

doi:10.1117/12.2514225

1 April 2019 Multi-frequency excitation based full-field laser scanning for improved depth estimation (Conference Presentation)

Seong Jin Im, JunYoung Jeon, Gyuhae Park, To Kang, Soon Woo Han

Author Affiliations +

Proceedings Volume 10971, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XIII; 109710B (2019) https://doi.org/10.1117/12.2514225
Event: SPIE Smart Structures + Nondestructive Evaluation, 2019, Denver, Colorado, United States

Abstract

This paper presents the improved thickness estimation technique using Steady-state excitation Continuous-scanning Laser Doppler Vibrometery(SCLDV). In this study, the wavenumber sensitivity with respect to the thickness variations of a structure, along with the information of wave modes, is utilized to find an optimal interrogation frequency band for SCLDV. In addition, the use of multi-frequency steady-state response is used to improve the accuracy of the thickness variation. By utilizing the wavenumber sensitivity along with the multi-frequency excitations, the proposed SCLDV shows the improved depth estimation, compared to the previous approaches which empirically select the interrogation frequency. For validation of this technique, several experiments were performed on steel plates, which contain corrosion damage with various depth variations. The results showed that the proposed technique is very efficient in detecting and visualizing very small thickness variations of a structure at high speed.

Conference Presentation

Citation Download Citation

Seong Jin Im, JunYoung Jeon, Gyuhae Park, To Kang, and Soon Woo Han "Multi-frequency excitation based full-field laser scanning for improved depth estimation (Conference Presentation)", Proc. SPIE 10971, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XIII, 109710B (1 April 2019); https://doi.org/10.1117/12.2514225

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KEYWORDS

Laser scanners

Corrosion

Doppler effect

Visualization

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