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AssigneeAkademiet for de Tekniske Videnskaber, Svejsecentralen
InventorsSvend Aage Lund, Palle Rasmus Jensen
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Method and apparatus are disclosed in which it is possible by means of ultrasonic examination according to the pulse echo method to obtain an indication, or a recording of images, of internal inhomogeneities in otherwise homogeneous bodies, corresponding substantially to the images obtained by producing a normal radiographic film of the body. To obtain this an ultrasonic angle probe is moved across the surface of the body and the echo signals are used to produce punctiform markings on a recording surface in such a way that (a) the markings are effected along a moving axis of indication, (b) the displacement of a reference point on the axis of indication follows the displacement of the sound emission point of the probe, (c) the direction of the axis of indication follows the direction of the projection of the sound path on the surface of the body, and (d) the distance from the reference point to each marking is proportional to the echo time of the corresponding ultrasonic pulse. Various methods of recording, including remote recording, are described.
A method of indicating, or of recording images of internal inhomogeneities in otherwise homogeneous bodies which have a substantially plane or slightly curved surface, by ultrasonic examination according to the pulse echo method, including guiding at least one angle probe connected to an ultrasonic apparatus across the surface of the body to scan its interior by emitting and receiving short-duration ultrasonic pulses in directions that form a predetermined angle with the surface of the body, and activating indicating means in response to received reflected sound pulses to produce punctiform markings on a substantially plane recording surface, characterized by the steps of moving the indicating means having an axis of indication along which the markings on the recording surface are made to thereby move the axis in the plane of the recording surface in such a way that the displacement of a reference point on the axis of indication in relation to the recording surface follows the two-dimensional displacement of the sound emission point of the probe in relation to the surface of the body on a predetermined scale, the axis of indication in relation to the recording surface following the direction of the projection of the sound path on the surface of the body, each of said markings being effected at a distance from the reference point that is proportional to the time interval that has elapsed from the emission to the reception of a sound pulse.
An apparatus for indicating, or for recording images of internal inhomogeneities in otherwise homogeneous bodies which have a substantially plane or slightly curved surface by ultrasonic examination according to the pulse echo method, comprising an ultrasonic apparatus having at least one angle probe connected thereto and indicating means responsive thereto which, by being activated when reflected sound pulses are received by said ultrasonic apparatus produce punctiform markings on a substantially plane recording surface, characterized by means to move the indicating means having an axis of indication along which the markings on the recording surface are made to thereby move this axis in the plane of the recording surface so that the displacement of a reference point on the axis of indication in relation to the recording surface follows the two-dimensional displacement of the sound emission point of the probe in relation to the surface of the body on a predetermined scale, the direction of the axis of indication in relation to the recording surface following the direction of the projection of the sound path on the surface of the body, the indicating means producing markings at a distance from the reference point that is proportional to the time interval that has elapsed from the emission to the reception of a sound pulse.
Dependencies are inferred from the claim text.