Relationship between Second- and Third-order Acoustic Nonlinear Parameters in Relative Measurement
http://www.sciencedirect.com/science/article/pii/S0041624X14002947
Relationship between second- and third-order acoustic nonlinear parameters in relative measurement
Highlights
- •
We proposed the simplified form of third-order acoustic nonlinear parameter.
- •
We newly derived the relationship between simplified forms of second- and third-order nonlinear parameter.
- •
We experimentally verified this new relationship.
Abstract
The higher-order acoustic nonlinear parameters are considered effective damage indices in the field of nondestructive evaluation (NDE). They are defined by using the displacement amplitudes of the fundamental frequency and the harmonics, which are called the absolute nonlinear parameters. Generally, however, it is difficult to measure the very small displacement amplitudes of high-frequency harmonics. Therefore, the simplified parameters using the detected wave signal amplitudes, which are known as the relative nonlinear parameters, have been widely used, although their applications are limited to the relative comparison of before and after damage of a single material under consistent experimental circumstances. In this paper, in order to make clear the concept of relative parameter, we presented first that the relative ratio of the simplified parameters is identical to that of the absolute parameters when the detected signal amplitudes are linearly proportional to the actual displacement amplitudes with respect to the fundamental frequency and the harmonics. In addition, the new relationship between the relative ratio of simplified second-order parameter and the relative ratio of simplified third-order parameter was derived from the relationship between the absolute second- and third-order parameters. This new relationship was successfully verified based on experimental results obtained from Al 6061-T6 processed for different heat treatment times, where it was confirmed in advance that the PZT detection signal amplitudes at the fundamental frequency and its second- and third-order harmonics were linearly proportional to the displacement amplitudes.
-
인듐안티모나이드(InSb) 소자를 이용한 적외선 방사온도 계측시스템의 개발 연구
-
Crack Detection in Single-Crystalline Silicon Wafer Using Laser Generated Lamb Wave
-
Relationship between Second- and Third-order Acoustic Nonlinear Parameters in Relative Measurement
-
"Acoustic Nonlinearity of Surface Wave in a Fatigued Aluminum Alloy Specimen "
-
Fully Non-Contact Assessment of Acoustic Nonlinearity According to Plastic Deformation in Al6061 Alloy
-
"수박에서의 초음파 전파 특성에 관한 실험적 연구"
-
Wavelet analysis based deconvolution to improve the resolution of scanning acoustic microscope images for the inspection of thin die layer in semiconductor
-
펄스형 초음파 신호에서 비선형 파라미터의 정밀추정
-
Laser ultrasonic inspection in ablation regime
-
Initial Second Harmonic Generation in Narrowband Surface Waves by Multi-Line Laser Beams for Two Kinds of Spatial Energy Profile
-
Ultrasonic Characterization for directional coarsening in nickel-base superalloy during creep exposure
-
Reflection and Transmission of Acoustic Waves Across Contact Interfaces
-
In-Line Ultrasonic Monitoring for Sediments Stuck on Inner Wall of a Polyvinyl Chloride Pipe
-
"Development of Pressure Control System of Contact Transducer for Measurement of Ultrasonic Nonlinear Parameter "
-
Simulations for Internal Defect Inspection using Laser Generated Ultrasonic Wave in Ablation Regime
-
Influence of slit width on harmonic generation in ultrasonic surface waves excited by masking a laser beam with a line arrayed slit
-
CHARACTERIZATION OF TAINLESS STEEL FIBER REINFORCED ALUMINUM COMPOSITE USING ULTRASONIC NONLINEARITY
-
Initial Second Harmonic Generation in Narrowband Surface Waves by Multi-Line Laser Beams for Two Kinds of Spatial Energy Profile Models
-
Experimental Characterization of Cyclic Deformation in Copper Using Ultrasonic Nonlinearity
-
전파속도를 알 수 없는 재료에서의 AE 발생위치 온라인 측정