SU1578847A1 - Method of determining directional pattern of ultrasound converter in solid body - Google Patents

Abstract

The invention relates to the monitoring of the acoustic characteristics of ultrasonic transducers. The goal is to increase the information content and accuracy in determining the directivity pattern of the converter in a solid body by measuring in both the near and far zones. The method consists in inputting and receiving radiation, respectively, on mutually orthogonal solid surfaces. The input of radiation (bulk ultrasonic waves) into a solid body is carried out at different areas of contact of the working surface of the controlled transducer with a solid body. The reception is performed at points located along arcs of circles of different radii with a common center lying on the edge of a solid body formed by the radiation input and reception planes. For each point of reception, the maximum value of the signal corresponding to this point is recorded. After registering the received signals, a graph of the distribution of the fields is plotted. 1 il.

Description

The invention relates to the technique of controlling the acoustic characteristics of ultrasonic transducers used in the conduct of non-intrusive testing of products.

The purpose of the invention is to increase the information content and accuracy in determining the directivity pattern of the transducer in a solid body by measuring in both the near and far zones0

The method consists in inputting and receiving radiation, respectively, on mutually orthogonal solid surfaces. Radiation is input into a solid, namely, bulk (longitudinal or transverse) ultrasonic waves, is carried out at different contact areas of the working surface of the controlled transducer with a solid, and reception is performed at points that are

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arcs of circles of different radii with a common center lying on the edge of a solid body formed by the radiation input and reception planes. For each point of reception, the maximum value of the signal corresponding to this point is recorded. After registering the received signals, a floor distribution is plotted.

The drawing shows schematically a device for carrying out the proposed method.

Transducer 1 under investigation is fixed on the plane of radiation input of solid 2 with the help of magnetic clamp 3 so that the VG face of this body bounds the emitting surface of the transducer under investigation

specified segment AB. A receiving transducer 4 is installed on the plane of receiving a radiation of a solid IOP; Converters 1 and 4 are connected to a flaw detector (not shown).

Ultrasonic volume waves (longitudinal for direct and transverse for an oblique converter) emitted by the transducer 1 being investigated, propagating along the IOP plane receiving a solid body 2, are transferred to the lateral waves; which are received by the receiving transducer 4 installed in the coordinate-scanning mechanism 5. The receiving transducer has a variable input angle. Moving the receiving transducer 4 along the coordinate line 6 of the mechanism 5 establishes a predetermined distance between it and the radiating transducer 1. The angular displacement of the ruler 6 is measured by the protractor 7.

The amplitude of the transformed side-wave received at an arbitrary point on the receiving surface of the solid is directly proportional to the amplitude of the radiated field distributed below the surface of the solid 2 for all distances from the radiating transducer to the receiving

Line 6 is set perpendicularly to the VG face and, by changing the input angle of the receiving transducer 2 and simultaneously rotating it around OO, find the maximum echo signal of the side waves. To remove the angular distribution of the field at a given distance, the ruler 6 is rotated around the axis 00 s

the specified angular step (on the protractor 7) and for each position of the receiving transducer 4 find the maximum amplitude of the receiving signal

rotation of the converter around the axis O Oh and register it. To remove the distribution of the field along the acoustic axis of the transducer under investigation, the receiving transducer 4 is moved with a predetermined pitch along the ruler 6 at its perpendicular position to the VG edge and for each position of the receiving transducer the amplitude of the received signal is measured. Change (increase or increase) the radiating surface of the converter under study by moving it relative to the VG face and the described operations are repeated.

The method according to the invention makes it possible to obtain reliable information about the spatial distribution of the radiation field of the transducer under investigation, both in the near and in the far zone.

Claims (1)

Formula iso rete n i five five / five five 0 The method for determining the radiation pattern of an ultrasound transducer in a solid, including the insertion into a solid of bulk (longitudinal or transverse) ultrasonic waves, receiving and recording them at points located along a circular arc with a center lying on the surface of the radiation input into the solid, plotting the distribution a floor, characterized in that, in order to increase the information content and accuracy by measuring both in the near and in the far zone, the input and reception of radiation is carried out accordingly on mutually orthogonal surfaces of a solid, the radiation being introduced into a solid is carried out at different areas of contact of the working surface of the controlled converter with a solid, and reception is performed at points located along arcs of circles of different radii with a common center lying on the verge of a solid bodies formed by radiation input and reception planes, and the maximum signal value is recorded for each reception point. and tf