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US 3,996,792 AGranted
Supersonic wave flaw detecting apparatus
AssigneeHitachi, Ltd.
InventorsJun Kubota, Soji Sasaki
Life of this patent
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AssigneeHitachi, Ltd.
InventorsJun Kubota, Soji Sasaki
Estimating the term…
A supersonic or ultrasonic wave flaw detector in which acoustic boundaries of flaws and/or abnormality of materials within an object to be inspected is detected by supersonic or ultrasonic waves and the position and shape of such a flaw and/or abnormality are displayed. A hard object to be inspected is sector-scanned with a supersonic wave beam with a variable-angle beam probe in direct contact with the object. In a range of comparatively small incident angles at which the longitudinal wave mainly penetrates the object, sectional images due to echo signals of the longitudinal wave are displayed on a display screen with scanning lines representative of the transmission speed and direction of the longitudinal wave. In the range of large incident angles where the shear wave penetrates the object, on the other hand, sectional images due to the echo signals of the shear wave are displayed on the display screen with scanning lines representative of the transmission speed and direction of the shear wave. For this, the sweeping speed and direction for the display scanning lines are switched in accordance with the ranges of incident angles. The switched flaw detecting operation modes of longitudinal and shear waves thus combined covers a complete sectional image to be displayed on the display screen.
A supersonic wave flaw detecting apparatus comprising a variable angle beam probe for performing sector scanning by transmitting and receiving a supersonic wave beam while maintaining acoustic contact with an object of inspection, said probe generating an electrical signal in accordance with the direction of transmission and receiving of the supersonic wave beam, a display unit for displaying an acoustic sectional image of said object on a display screen of said display unit, said display unit brightness-modulating the display scanning lines with an echo signal of said supersonic wave beam received from said object by said variable angle beam probe, said display scanning lines being associated with the transmission path and transmission velocity of said supersonic wave beam in said object of inspection, an angle detector for detecting the incident angle of said supersonic wave beam from said variable angle beam probe and generating an angular signal, a scanning mode control device for generating command signals in accordance with the two modes of the longitudinal wave and shear wave in response to the angular signal from said angle detector, and a scanning signal generator for producing a display scanning signal for said display unit in accordance with the velocity and direction of transmission of a selected one of the longitudinal wave and shear wave of the supersonic wave beam in response to said command signals produced from said scanning mode control device and said angular signal produced from said angle detector.
Dependencies are inferred from the claim text.