JPS58178252A - Ultrasonic probe - Google Patents

Abstract

PURPOSE:To detect an internal defect efficiently by radiating an ultrasonic wave in wide range with a convexospherical or cylindrical shell-shaped vibrator. CONSTITUTION:An ultrasonic wave propagation medium 1 takes the shape of a rough wedge and a vibrator 3 comprising a piezo-electric element with the shape of a convexospherical shell having a radius (r) or a cylindrical shell with a cross-section of a radius (r). Here, the angles separately between normals at incident point ends C and D of an ultrasonic wave beam and straight lines 4 and 5 are set at alpha and beta. If only a horizontal wave alone is to enter a sample 2 to be detected, a probe for detection of ultrasonic waves with an expansive horizontal wave is made by properly selecting alpha and beta to meet the requirement of the formula I ) (where, vL1 represents velocity of the vertical wave in the ultrasonic propagation medium 1, vL2 velocity of a vertical wave in the sample 2 and vB2 velocity of a horizontal wave in the sample 2). With such an arrangement, this is very approriate for rough flaw inspection on the job site eliminating the need for longitudinal scanning in a test of ultrasonic flaw inspection or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic probe capable of emitting ultrasonic waves over a wide range, and its purpose is to efficiently detect internal defects through ultrasonic flaw detection tests and the like.

The conventionally developed angle probe for ultrasonic flaw detection is the 11th
Either a parallel beam is incident on the object (2') by the transducer (5') as shown in Figure 2, or the beam of the transducer (6') is applied as shown in Figures 2) to 3). Although the beam was made to focus within the specimen (2'), I have not seen any attempt to actively widen the beam within the specimen.

The above-mentioned parallel or point-focusing type probes are suitable for precision flaw detection, but they are difficult to detect when only determining the presence or absence of defects.
``It is not suitable for use as rough flaw detection 1 in the field.

This invention provides an ultrasonic probe that is suitable for on-site use such as "rough flaw detection" and that emits ultrasonic waves over a wide range, making it hot. The purpose is to do something.

This will be explained in detail below with reference to the figures.

In the figure, (1) is an ultrasonic propagation medium made of synthetic resin such as acrylic resin. This medium (1) is approximately wedge-shaped, and its bottom surface (1a) is brought into contact with the surface of the subject (2). During this contact, a propagation medium such as machine oil (
(not shown).

(3) is a vibrator made of a piezoelectric element, and its shape is a convex spherical shell with a radius r, as shown in Figure 6 (4), or a convex spherical shell with a radius r, as shown in Figure 6 (4).
As shown in Q(B), the cross section is a circle with radius r, and its generatrix forms part of a cylindrical shell that is straight within the cabinet.

C , D, each intersection C, D becomes the end of the incident point of the ultrasonic beam. Note that straight lines (4) and (5) are the effective end points of the vibrator (3),
At B, it coincides with the normal line of the vibrator (3).

The normal lines erected to the incident point ends C and D are (6), respectively.

(7), and the angles formed by straight lines (4) and (5) are ' + I, respectively. If you want only transverse waves to enter the object (2), then α and β satisfy the following conditions. It is necessary.

Here, U L is the longitudinal wave velocity in the ultrasound propagation medium (1), vL2 is the longitudinal wave velocity in the object (2), and W
, , are the transverse wave velocities in the object (2).

By appropriately selecting α and β in this manner, a probe for ultrasonic flaw detection using transverse waves having a p1 spread is constructed.

Next, in a special case where only a longitudinal wave with a wide spread is incident on the object (2), α and - may be selected so as to satisfy the following conditions.

By the way, if the ultrasonic propagation medium (1) is acrylic resin and the object (2) is steel, and a spread transverse wave is to be applied, α, - will be 57.7'≧α〉β〉216°. .

As described above, according to the present invention, it is possible to spread the ultrasonic waves in the specimen, so there is no need for preliminary scanning in ultrasonic flaw detection tests, etc., and one rough flaw detection in the field is possible.
This is extremely appropriate.

Therefore, by using the ultrasonic probe according to the present invention, it is possible to easily determine the presence or absence of internal defects in a test object, and it is possible to efficiently perform ultrasonic flaw detection tests.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the different types of conventional ultrasound probes, Figure 2
The figure is an explanatory diagram showing an actual example of the ultrasonic probe according to the present invention.
FIG. 5 is an explanatory diagram showing each type of vibrator. (1): Ultrasonic propagation medium, (2): Subject, (3):
vibrator. Agent Patent Attorney Sanro Kimura Figure 1 (A) 1B) (C
)1 ID) (E) Figure 2,, + 10 Figure 3 (Deletion (Draw)

Claims (1)

[Claims] An ultrasonic probe characterized by having a transducer in the shape of a convex spherical shell or a cylindrical shell.