JPS6262287B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic probe, and more particularly to a multi-ultrasonic probe suitable for flaw detection in primary cooling system piping of nuclear power plants.

Conventionally, flaw detection of primary cooling system piping in existing nuclear power plants has been carried out manually using three ultrasonic probes: one vertically at 0 degrees, the other at an oblique angle of 45 degrees and 60 degrees. Incidentally, in recent years, semi-automation of flaw detection has been promoted in order to reduce radiation exposure of inspectors. However, in the above case, the ultrasonic probe must be scanned one by one, which complicates the structure of the device, and the amount of radiation exposure is large. Tentacles are desired.

In this way, in a nuclear power plant, the vertical angle (0 degree)
Despite the demand for flaw detection at three angles: and two types of oblique angles (45 degrees and 60 degrees), there was no probe that could perform multi-angle flaw detection in a short time with a single probe. .

The purpose of the present invention is to scan three images at different angles in one scan.
To provide an ultrasonic probe that can quickly detect flaws with a regular beam and can ensure reliable flaw detection by providing good accessibility to the weld line even if the weld line has excess.

The shoe for transmitting ultrasonic waves is divided and acoustically separated from each other, and one transducer of a two-split type transducer for vertical flaw detection and one transducer for oblique flaw detection are installed in one of the separated shoes. The other two-part vibrator for vertical flaw detection and the other vibrator for oblique flaw detection are attached to the other separated shoe, and the one vibrator for oblique flaw detection and the other The transducers for oblique flaw detection are attached to each shoe in such a way that the ultrasonic beams have different oblique angles from each other and pass below the two-split type transducer within each shoe. This is an ultrasonic probe that uses multiple beams at different angles in one scan.
It enables rapid flaw detection from multiple angle directions, and even if there is excess when inspecting a weld line, each diagonal beam incident is concentrated near the vertical beam incident part by the two-split type vibrator, and all beams are incident. This improves the accessibility to the inspection position.

The present invention will be explained in detail below using the embodiments shown in FIGS. 1 to 3.

FIG. 1 is a longitudinal cross-sectional view showing one embodiment of the ultrasonic probe of the present invention, FIG. 2 is a cross-sectional view taken along the line A--A in FIG.
FIG. 3 is a cross-sectional view. In Fig. 1, 1 is a case, 2 is a shoe, 3 is an ultrasonic transducer for a refraction angle of 0°, 4 is an ultrasonic transducer for a refraction angle of 45°, 5 is an ultrasonic transducer for a refraction angle of 60°, and 6 7 is a cable, 8 is an ultrasonic beam with a refraction angle of 0°, 9 is an ultrasonic beam with a refraction angle of 45°, and 10 is an ultrasonic beam with a refraction angle of 60°.

The above-mentioned refraction angle is expressed by the angle formed between the normal line of the ultrasonic wave input surface and the ultrasonic beam. Since the vertical beam is on the normal line, the angle of refraction is 0°. The beam refraction angle of the vibrator 3 shown here is 0°.

The transducer 3, as shown in FIGS. 2 and 3, consists of ultrasonic transducers 3a and 3b that are mounted separately into shoes 2a and 2b separated by a sound material 6,
For example, the ultrasonic beam 8 is sent out from the ultrasonic transducer 3a, reflected by a defect 12 within the subject 11, and received by the transducer 3b.

On the other hand, ultrasonic transducers 4 for 45° and 60°,
5 are attached to the shoes 2a and 2b, respectively, and the transducers 4 and 5 of these probes transmit and receive ultrasonic beams 9 and 10, respectively, with one transducer. Note that since the beams 9 and 10 have a positional offset value D from the center, it is necessary to correct this offset value when data is processed using a computer.

As described above, the ultrasonic probe of the present invention transmits and receives ultrasonic beams using separate transducers 3a and 3.
Split-type ultrasonic transducer 3 for refraction angle 0° performed in b.
Ultrasonic transducers 4 and 5 for refraction angles of 45° and 60°, which transmit and receive ultrasound beams with one transducer, are connected to a second wave transducer 2a and 2b separated by a sound material 6.
As shown in Figures 1 and 3, the incident points of the three ultrasonic beams can be aligned on the same line, and the approach of each ultrasonic beam (ultrasonic ) can be maintained well. Also, in one scan, 3
Since flaws can be detected using an ultrasonic beam, the amount of radiation exposure can be reduced accordingly.
Furthermore, since the ultrasonic transducers 3 to 5 that transmit and receive the three ultrasonic beams 8 to 10 are housed in one case, the device is compact.

In addition, in FIG. 1, three ultrasonic beams 8
Although the ~10 incident points are one point, it may be effective depending on the purpose of use even if the incident points are placed one after the other.

As explained above, according to the present invention, since ultrasonic beams with multiple refraction angles can be transmitted, flaw detection can be performed quickly with multiple beams in one scan, and without being blocked by sound insulating materials. There is an effect that good accessibility can be maintained by bringing the incident point of each ultrasonic beam close to the vertical beam incident point with a refraction angle of 0 degrees.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing one embodiment of the ultrasonic probe of the present invention, FIG. 2 is a cross-sectional view taken along the line A--A in FIG.
FIG. 3 is a cross-sectional view. 1... Case, 2, 2a, 2b... Show, 3... Ultrasonic transducer for refraction angle of 0°, 4... Ultrasonic transducer for refraction angle of 45°, 5... Ultrasonic transducer for refraction angle of 60°, 6...
Shiya sound material, 8 to 10... Ultrasonic beam, 11... Subject, 12... Defect.

Claims (1)

[Claims] 1. In an ultrasonic probe in which a plurality of ultrasonic transducers are attached to a shoe for transmitting ultrasonic waves, the shoe for transmitting ultrasonic waves is divided and acoustically separated from each other by a sound insulating material, and the One transducer of a two-part transducer for vertical flaw detection and one transducer for oblique flaw detection are placed in one shoe, and the other transducer of a two-part transducer for vertical flaw detection is placed in the other separated shoe. and the other transducer for oblique flaw detection are mounted in series along the sound insulating material, and the one transducer for oblique flaw detection and the other transducer for oblique flaw detection have different oblique angles. An ultrasonic probe, characterized in that the ultrasonic beam is attached to each shoe in such a way that the ultrasonic beam passes below the two-part transducer within the shoe.