SNR enhancement for composite application using multiple Doppler vibrometers based laser ultrasonic propagation imager |
| |
| Institution: | 1. College of Mechanical and Electrical Engineering, Nanyang Normal University, Nanyang 473061, China;2. College of Physics and Electronic Engineering, Nanyang Normal University, Nanyang 473061, China;3. Sichuan Information Security Testing Evaluation Center, Chengdu 610000, China;1. School of Mechanical Engineering & Automation, Northeastern University, Shenyang, Liaoning, China;2. Department of System Cybernetics, Hiroshima University, Kagamiyama, Hiroshima, Japan;1. AGH University of Science and Technology, Al. A. Mickiewicza 30, Krakow 30-059, Poland;2. Airbus Defence and Space, B.P. 20011, Saint Médard en Jalles Cedex 33165, France;1. Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology, Republic of Korea;2. X-NDT Inc., Republic of Korea;3. Aeronautical Technology Directorate, Agency for Defense Development, Republic of Korea;4. LANL-CBNU Engineering Institute-Korea, Chonbuk National University, Republic of Korea;5. The Engineering Institute, Los Alamos National Laboratory, United States |
| |
| Abstract: | In recent years, the technology of using laser ultrasonic propagation imaging for damage visualization of composite structures were applied to real-world applications. Among many choices of sensor for the Ultrasonic Propagation Imager, the laser interferometry has several advantages: it is non-invasive, and portable, and with extraordinarily long-range measurement. However, the critical issue with interferometry sensing is its low signal-to-noise ratio (SNR), where the background noise can mask the damage-induced waves and making it impossible to identify the damages, especially in composite structures. In this paper, we propose a hardware-based SNR enhancement technique using multiple Laser Doppler Vibrometers (LDVs). The out-of-plane mode of ultrasonic signals are measured by multiple LDVs at a common sensing point and then averaged in real time. We showed that the SNR enhancement in experiments was consistent with the theoretical prediction, and also the test results showed a clear improvement for damage visualization of structures using Ultrasonic Wave Propagation Imaging and Ultrasonic Wavenumber Imaging algorithms. |
| |
| Keywords: | Laser Doppler Vibrometers Carbon fiber reinforced plastic Aerospace structure Laser Ultrasonic Propagation Imager Ultrasonic Wavenumber Imaging |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
