JPS58180946A - Focussing type ultrasonic probe - Google Patents

Abstract

PURPOSE:To obtain a focal point with an optional depth by exchanging only a shoe, by a method wherein an acoustic lens space is provided to the shoe by processing the same and focussed ultrasonic waves are obtained by utilizing the difference in acoustic velocities of the material quality of a substance filling said space and the material quality of the shoe. CONSTITUTION:Incident ultrasonic waves applied to a shoe 3 provided with a recessed part 2 having radius of curvature of R from a vibrator 1 bring lens effect by a medium 4 having acoustic velocity different from that of the shoe 3 filling the recessed part 2 to be converged. In this case, the shoe 3 is brought into close contact with an object 5 to be tested through the medium so as to obtain converged ultrasonic waves at a focal point 6 by the difference in acoustic velocities of the shoe 3 and the object 5 to be tested. By this constitution, because a focal point with an optional depth can be set by exchanging only the shoe with respect to one vibrator, a probe with various focus depths can be supplied inexpensively.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a probe used in ultrasonic flaw detection testing, and in particular to a focusing probe suitable for precise evaluation of material defects.
This makes it possible to easily change the focal length by replacing the shoe.

Conventional focusing type bevel probes have a fixed focus search, so they often have the disadvantage that a large number of probes are required to obtain a focus at an arbitrary depth.

An object of the present invention is to provide a focusing type ultrasonic probe in which only the shoe is replaced in an ultrasonic probe in which the transducer and the shoe are separated, thereby obtaining a focal point at an arbitrary depth.

Conventional focal point type tactile probes have a lens effect on the vibrator itself, but in the present invention, a sound condensation gap is created in the shoe, and the sound speed of the shoe and the medium that fills this space are changed. This difference provides an ultrasonic focusing effect.

An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 shows the state in which the specially processed shoe of the present invention is coupled to a normal vertical probe and brought into contact with a test object.

In FIG. 1, ultrasonic waves incident from a vibrator 1 into a shoe 3 having a concavity 2 of curvature R are converged due to the lens effect caused by a medium 4 having a different sound velocity from the shoe filling the concavity. Further, by bringing the shoe 3 and the test object 5t into close contact with each other via a medium, a focal point 6 can be obtained within the test object due to the difference in sound speed between the shoe and the test object.

Although FIG. 2 shows the case of an oblique probe, there is an I# enemy in which by preparing a large number of shoes with different curvatures R, the focal point can be set to an arbitrary depth by replacing only the shoes.

FIGS. 3 and 1g4 show examples of fixed focus type probes using conventional curved vibrators for reference.

According to the present invention, a focal point of any depth can be set for one vibrator by replacing only the shoe, so there is an advantage that bevel probes of various focal depths can be supplied at low cost.

[Brief explanation of the drawing]

Figure 1 shows a state in which the focus is set inside the test object by the lens effect of the shoe in vertical flaw detection, and Figure 2 shows the state in which the focus is set in the test object by the lens effect of the shoe in the case of oblique sampling. 3 and 4 are explanatory diagrams of a conventional fixed focus type probe using a curved type probe. DESCRIPTION OF SYMBOLS 1... Vibrator, 2... Indentation of curvature H, 3... Shoe, 4... Medium, 5... Test object, 6... Focus. Agent Patent Attorney Akio Takahashi 1st Kuchika 2nd

Claims (1)

[Claims] 1. In an ultrasonic probe consisting of a probe and a shoe, a sonic lens space is created in the shoe, and the sound velocity difference between the material of the object filling the space and the material of the shoe is used to generate focused ultrasound waves. A focused ultrasonic probe whose % characteristic is to obtain .