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The near-field imaging method based on the spatio-temporal gradient analysis
Kenbu Teramoto,Akito Uekihara 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Ultrasonic guided waves, because of their long range in spection ability, are now being used more and more as a very efficient and economical NDE method for large are a inspection. The use of Lamb-waves has recently been interested in the non destructive evaluations for thin-plate-like structures. The conventional time-of-flight technique is not reliable for locating the defects even in isotropic plates because of the dispersiveness in the Lamb-wave propagation. A voiding difficulties caused by the dispersiveness, this paper proposes a novel spatio-temporal gradient imaging method which has anability to localize cracks and to reconstruct the near-field images of cracks. The proposed method utilizes the determinant of the covariance matrix defined over the shear strain field over the surface. The determinant denotes the Distributions of Correlated Intensity Modulation(DCIM) of the incident and scattered wave fronts. The DCIM increases significantly in the near-field of the point-like defects. In this study, the computational process in wave field near-the defects is discussed and their physical meanings are investigated through FDTD-simulations.
Time reversal imaging for gradient sensor networks over the Lamb-wave field
Kenbu Teramoto,Akito Uekihara 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Combining the time reversal mirror(TRM) with the spatio-temporal gradient analysis has an ability to localize a scatterer such as a defect in a thin plate. Time-reversed signals propagate backwards through the time-independent medium and go throug hall the multiple scattering, reflections, and refraction. As a result, the TRM provides the means for converging wave front narrowly in time and space. If the focal point coincides with a point-like, the converging cylindrical wave provides the orthogonal pair of out-of-plane-surface shear strains to be linearly independent. The proposed imaging method utilizes the determinant of the covariance matrixde fined over the shear strain field. The determinant denotes the Distributions of Correlated Intensity Modulation(DCIM) of two or more converging wave fronts. The DCIM increases significantly in the near-field of the focal point. In this paper, we explore analytically and numerically the defect imaging by time reversal method based on the spatio-temporal gradient analysis.
A Study on Bladder Compression Systems for Urination Assist
Kazuo Kiguchi,Yoshihiko Sakamoto,Kenbu Teramoto,Jiro Uozumi,Keiji Nakashima 한국과학기술원 인간친화 복지 로봇 시스템 연구센터 2005 International Journal of Assistive Robotics and Me Vol.6 No.2
An implantable urination assist system is proposed, which could help patients with neuropathic bladder to regain self-urination ability. The proposed system assists the urination by directly pushing the bladder of the patient using Shape Memory Alloys(SMA). Peltier elements are used to control the temperature of the SMA in the system. The effectiveness of the proposed system was evaluated by experimental tests with a bladder model.