发明授权
US6128092A Method and system for high resolution ultrasonic imaging of small
defects or anomalies.
有权
用于高分辨率超声成像小缺陷或异常的方法和系统。
- 专利标题: Method and system for high resolution ultrasonic imaging of small defects or anomalies.
- 专利标题(中): 用于高分辨率超声成像小缺陷或异常的方法和系统。
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申请号: US353018申请日: 1999-07-13
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公开(公告)号: US6128092A公开(公告)日: 2000-10-03
- 发明人: Daniel Levesque , Alain Blouin , Christian Neron , Jean-Pierre Monchalin
- 申请人: Daniel Levesque , Alain Blouin , Christian Neron , Jean-Pierre Monchalin
- 申请人地址: CAX Ottawa
- 专利权人: National Research Council of Canada
- 当前专利权人: National Research Council of Canada
- 当前专利权人地址: CAX Ottawa
- 主分类号: G01N29/24
- IPC分类号: G01N29/24 ; G01N29/40 ; G01N29/42 ; G01N29/46 ; G01S15/89 ; G01B9/02
摘要:
A method and system is provided for enhanced ultrasonic detection and imaging of small defects inside or at the surface of an object. The Synthetic Aperture Focusing Technique (SAFT) has been used to improve the detectability and to enhance images in conventional ultrasonics and this method has recently been adapted to laser-ultrasonics. In the present invention, an improved version of the frequency-domain SAFT (F-SAFT) based on the angular spectrum approach is described. The method proposed includes temporal deconvolution of the waveform data to enhance both axial and lateral resolutions, control of the aperture and of the frequency bandwidth to improve signal-to-noise ratio, as well as spatial interpolation of the subsurface images. All the above operations are well adapted to the frequency domain calculations and embedded in the F-SAFT data processing. The aperture control and the spatial interpolation allow also a reduction of sampling requirements to further decrease both inspection and processing times. This method is of particular interest when ultrasound is generated by a laser and detected by either a contact ultrasonic transducer or a laser interferometer.
公开/授权文献
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