JPH0658361B2 - Ultrasonic probe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an ultrasonic testing device for an ultrasonic testing device for detecting defects, inclusions and the like existing inside the corners of plate materials and square billet materials. It is about tentacles.

[Conventional technology]

FIG. 2 is a sectional view of a conventional ultrasonic probe.
(a) is a transverse sectional view of the ultrasonic probe, and FIG. 2 (b) is a front sectional view.

In the figure, (1) is a flat transmission oscillator, (2) is a flat reception oscillator, (3) is a transmission attachment, (4) is a reception attachment, (5) is cork material, etc. Acoustic shield material, (6) case, (7), (8) connector, (9) shoe for keeping water film, (10) water film, (11) test piece, (1
2) is the flaw detection area, 13 is the surface flaw detection area due to the surface echo of the ultrasonic probe, and 14 is the unflawed area near the corner of the specimen 11.

The conventional ultrasonic probe uses the transducer for transmission as described above.
A flat vibrator is used for both (1) and the vibrator for reception (2), and the vibrator (1), (2) mounting surface of the transmission / reception attachments (3), (4) is the surface of the test body (11). Since it is almost parallel to
As shown in (a), the flaw detection area (12) is the transducer for transmission and reception.
It is formed just below (1) and (2). Also, at this time, in the vicinity of the surface of the test body (11), the transducer for transmission is
Due to the surface echo generated when the ultrasonic wave generated from (1) is received by the receiving transducer (2) from the transmitting attachment (3) via the water film (10) and the receiving attachment (4), respectively. A surface undetected area (13) is produced. In addition, since the end of the test body (11) generally has a curvature due to the corner droop, and conversely has a protrusion due to the burr at the time of cutting, the ultrasonic probe should be placed at the position just on the side of the test body (11). Placement is often difficult. As a result, there is an undetected area near the corner of the test body (11).

[Problems to be solved by the invention]

As shown above, the transceivers (1) and (2) for transmission and reception are flat plates,
And the transducers (1), (2) of the attachments (3), (4) for sending and receiving
In an ultrasonic probe whose mounting surface is configured to be substantially parallel to the surface of the test body (11), the flaw-detectable area (12) is formed almost directly under the transducers (1), (2) for transmission and reception. Therefore, there is a problem that an undetected area (14) is generated near the corner of the test body (11).

The present invention has been made to solve the above problems, and an object of the present invention is to obtain an ultrasonic probe capable of ensuring a conventional flaw detection area and capable of flaw detection up to a corner of a test body.

[Means for solving problems]

The ultrasonic probe according to the present invention is provided with a curvature for diffusing an ultrasonic wave on the surface fixing the transducer, and the center of curvature is such that the ultrasonic beam has a predetermined refraction angle in the test body. As described above, the transmission / reception oscillators having the same curvature as the curvature of the attachments are respectively provided on the transmission / reception attachments that are displaced from the center of the oscillators in the longitudinal direction by a predetermined value.

[Action]

In this invention, the transducer attachment surface of the transmission / reception attachment is inclined with respect to the surface of the test body (11) at the center of the transducer, and the ultrasonic wave can be propagated near the corner of the test body by the above inclination angle. It will be possible. In addition, since the transmission / reception attachment and the transmission / reception transducer each have a curvature that allows ultrasonic waves to diffuse, even if the ultrasonic beam is tilted near the corner of the test body, no flaw detection is performed inside the test body. Does not create a region. That is, it can be an ultrasonic probe that can secure a flaw detection area over a wide range.

〔Example〕

FIG. 1 is a sectional view of an ultrasonic probe showing an embodiment of the present invention, and FIG. 1 (a) is a transverse sectional view of the ultrasonic probe, and FIG.
Figure (b) is a front sectional view.

In the figure, (1) is a curved transmission oscillator, (2) is a curved reception oscillator, and (3) is the transducer (1) mounting surface has the same curvature as the transducer (1). , And the transmission attachment whose center of curvature is offset from the center of the transducer (1) in the longitudinal direction, (4)
Attachment for receiving similar to (3), (5) acoustic shield, (6) case, (7), (8) connector, (9) shoe,
(10) is a water film, (11) is a specimen, (12) is a flaw detection area, (13)
Is a surface flaw detection area, A is a transmission / reception attachment (3), (4)
The amount of deviation between the center of curvature of and the center of the length of the transducers (1) and (2) for transmission and reception, θ is the tilt angle of the ultrasonic beam.

In the ultrasonic probe configured as described above, the transducer (1), (2) mounting surface of the transmitting / receiving attachments (3), (4) is
At the same time that there is a curvature for the ultrasonic waves to diffuse, the center of curvature is deviated from the center of the transducers (3) and (4) in the longitudinal direction by a predetermined amount A. (11) The light is incident on the surface at an angle θ. As a result, the ultrasonic beam causes a predetermined refraction angle in the test body (11) according to Snell's law. The refraction angle is about 4 ° to 10 °
It is the most practical range to propagate the longitudinal ultrasonic wave in the range of the order.

In addition, since the ultrasonic waves are diffused, even if the entire ultrasonic beam is tilted, the flaw detection area (12) immediately below the transmitting / receiving transducers (3) and (4) does not decrease, and the ultrasonic beam It is possible to further increase the flaw detection possible region (12) in the tilt direction.

Therefore, by arranging the ultrasonic probe so that the inclination direction of the ultrasonic beam is on the corner side of the test body (11), the undetected region (14) generated at the corner of the test body (11) can be removed. It is possible to lose it.

〔The invention's effect〕

As described above, the present invention has a curvature for diffusing ultrasonic waves on the surface fixing the vibrator, and the center of curvature is such that the ultrasonic beam has a predetermined refraction angle in the test body. As described above, the transmission / reception oscillator having the same curvature as that of the transmission / reception attachment provided with the transmission / reception attachment displaced from the center of the transducer in the longitudinal direction by the predetermined value. It is possible to propagate the ultrasonic beam into the test object with a predetermined refraction angle and by diffusing it by providing it on each attachment for the test, and as a result, there is no flaw detection existing in the corner part of the test object. There is an effect that a practical ultrasonic probe capable of eliminating the area can be supplied.

[Brief description of drawings]

FIG. 1 is a sectional view of an ultrasonic probe according to the present invention, and FIG. 2 is a sectional view of a conventional ultrasonic probe. In the figure, (1) is a curvature transmission oscillator, (2) is a curvature reception oscillator, (3) is a transmission attachment, (4) is a reception attachment, and (11) is a test piece. (12) is the flaw detection area, and (14) is the non-flawed area at the corner. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (1)

[Claims] 1. In a two-transducer ultrasonic probe having a transmitting oscillator and a receiving oscillator, a curvature for diffusing ultrasonic waves on a surface fixing the transmitting oscillator and the receiving oscillator is provided. Further, the above-mentioned center of curvature has a transmission attachment in which the ultrasonic beam is displaced from the center in the longitudinal direction of each transducer by a predetermined value so that a predetermined refraction angle can be obtained in a test body having a corner portion. And a receiving attachment, and a transmitting oscillator and a receiving oscillator provided on the oscillator fixing surfaces of the transmitting and receiving attachments, respectively, and having the same curvature as that of the transmitting and receiving attachments. An ultrasonic probe characterized in that