JPS5831869B2 - Ultrasonic flaw detection equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic flaw detection device, and particularly to an ultrasonic flaw detection device suitable for performing flaw detection in a three-dimensional three-dimensional area using a variable angle probe.

Conventionally, in ultrasonic flaw detection equipment using a variable angle probe, the variable angle probe is driven at different angles to detect one cross-sectional area of the object to be inspected. Therefore, the flaw detection signal display is This is a B-scope display (cross-sectional display), and the inspection area that can be displayed on one screen is limited to one cross-sectional area of the object to be inspected, which has the disadvantage that flaw detection in a three-dimensional three-dimensional area is not possible.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art described above and to provide an ultrasonic flaw detection apparatus capable of detecting flaws in a three-dimensional three-dimensional area using a variable angle probe.

A feature of the present invention is to drive the variable angle probe in a direction that intersects a plane including the ultrasonic beam direction, and transmit flaw detection signals in at least the three directions orthogonal to the display surface of the display device. The key point is that the variable angle probe is configured to display an image viewed from a direction perpendicular to the angle of movement and the driving surface.

The present invention will be explained in detail below using the embodiments shown in FIGS. 1 to 5.

FIG. 1 is a diagram explaining the principle of an ultrasonic flaw detection device using a variable angle probe according to the present invention. In FIG. 1, 1 is a variable angle probe;
2 is an object to be inspected, and 3 and 4 are ultrasonic beams sent out from the variable angle probe 1.

Here, when the variable angle probe 1 is placed at the 0 point and is operated to change its angle to perform fan-shaped scanning of the ultrasonic beam, flaw detection in the cross section 0-B-D can be performed by this fan-shaped scanning.

Therefore, when the variable angle probe 1 is driven to change its angle and moved in the direction of the arrow shown along the O-C axis while performing fan-shaped scanning of the ultrasonic beam, flaws can be detected in approximately half of the area of the test object 2. can be done.

Next, place the variable angle probe 1 at point D of the object to be inspected 2,
While performing fan-shaped scanning of the ultrasonic beam in the same way as above,
By moving in the -G direction, about half of the remaining area can be detected for flaws, thereby making it possible to detect flaws in the entirety of the object to be inspected 2, that is, the entire three-dimensional area.

As described above, in the present invention, the variable angle probe 1 is driven to change the angle and scan the ultrasonic beam in a fan shape while moving in a direction intersecting a plane including the ultrasonic beam direction (the driving device is not shown). ), it is possible to perform flaw detection in a three-dimensional three-dimensional area of the object to be inspected 2.

FIG. 2 is a diagram showing the relationship between the coordinate axes of the display surface of a display device that displays flaw detection signals when flaw detection is performed by the method explained using FIG. 1.

In FIG. 2, the 0 point on the X-Y coordinate plane indicates the position where the variable angle probe 1 was first placed, and A and B are written in parentheses.

C corresponds to A, B, and C in FIG. 1, respectively.

Therefore, in the first quadrant 101, the upper surface 0-C- of FIG.
The flaw detection image seen from E-A can be displayed, the flaw detection image seen from the side 0-A-D-B in FIG. 1 can be displayed in the third quadrant 103, and the flaw detection image seen from the side 0-A-D-B in FIG. side 0-C-F-B
The flaw detection image seen from the front can be displayed.

Therefore, in these three quadrants, flaw detection images are displayed in chronological order using the flaw detection signals obtained when the variable angle probe 1 explained using Fig. 1 is moved in the O-C line direction. By doing so, all information can be displayed on one display screen.

As a result, the amount of flaw detection data can be reduced, and defects can be determined easily and quickly.

The second quadrant 102 is not necessarily necessary to display the flaw detection cross-sectional image of the inspected object 2, but if it is used to display the flaw detection conditions, sample number, or flaw detection status using a television camera, the entire surface can be used effectively. can do.

Generally, in the case of image processing, such a display space is often required for convenience of organization.

If necessary, if you want to display only the image of one of the three quadrants above, you may display only that image, which will have almost the same effect. .

FIG. 3 is a diagram showing the temporal relationship of the sweeping sawtooth wave for displaying flaw detection images in three quadrants in time series, as explained using FIG. 2.

In Fig. 3, T is a trigger signal, and trigger pulse T1 causes ultrasonic beams to be generated on the -X (A) and -Y (B) axes, respectively.
- A sawtooth wave is added to form a display scanning line corresponding to the propagation path and velocity of the beam, and in the third quadrant 103 of the display surface in FIG. A flaw detection image viewed from the 0-A-D-B plane is displayed in quadrant 103.

Next, a sawtooth wave of the component in the Y direction (OB force direction) of the display scanning line is added to the -Y (B) axis by the trigger pulse T2,
Additionally, a position signal in the X direction (OC direction) of the variable angle probe 1 is added to the X (C) axis, and the fourth quadrant 104 is
A flaw detection image viewed from the F-B plane is displayed.

Next, with the trigger pulse T3, the position signal of the variable angle probe 1 in the OC direction is added to the X0 axis as described above, and the sawtooth of the -X direction (OA direction) component of the display scanning line is added to the Y(A) axis. wave is applied, and a flaw detection image viewed from the 0-CE-A plane is displayed in the first quadrant 101.

At the trigger pulse T4, the state returns to the state of the trigger pulse T1, and the display is repeated chronologically in the same manner, and when the variable angle probe 1 reaches point C, the display of the entire flaw detection image is completed.

With this, for example, when a cathode ray tube is used as a display device, since it has an afterglow property, flaw detection images viewed from three orthogonal directions can be displayed simultaneously in three quadrants of the display surface of the display device.

Note that when displaying coordinate axes that correspond to the X-axis and Y-axis on the display screen, a luminance signal is entered in the Z-axis for luminance signals of the display device, and the respective axes, that is, -X, -Y, and ,Y
Sawtooth waves may be applied to each axis independently.

FIG. 4 is a block diagram showing an embodiment of the circuit of the ultrasonic flaw detection apparatus of the present invention for performing the display explained using FIG. 2.

In Fig. 4, 1 is a variable angle probe, 2 is an object to be inspected,
5 is an ultrasonic transceiver that transmits ultrasonic signals to the variable angle probe 1 and receives ultrasonic echo signals from defects etc. received by the variable angle probe 1; 6 is a trigger signal generator; ,
Trigger pulses T, , T2 . shown in FIG. ...is generated.

7 inputs a trigger pulse from a signal trigger signal generator 6 corresponding to the position of the variable angle probe 1 and the incident angle of the ultrasonic beam, and forms a display scanning line corresponding to the propagation path and speed of the ultrasonic beam. This is a sawtooth wave generation circuit that generates a sawtooth wave to be applied to the X-Y coordinate axes for the purpose of the present invention, as well as a position signal in the OC direction (see FIG. 2) of the variable angle probe 1.

8 is a selection gate circuit, which includes, for example, a flip-flop circuit element, an AND circuit element, an analog switch element, etc., and trigger pulse T1. T2.

. . . The sawtooth wave and position signal to be applied to the X-Y coordinate axes are selected in the order shown in FIG. 3 and output as a deflection signal.

Reference numeral 9 denotes a scan conversion memory, which inputs the flaw detection signal from the ultrasonic transmitter/receiver 5 on the Z axis, and inputs the deflection signal from the selection gate circuit 8 on the X and Y axes, respectively, to convert the above Z-axis input signal. By addressing, an ultrasonic flaw detection image is formed and stored, and read out using a standard TV signal.

Reference numeral 10 denotes a data insertion device that inserts flaw detection conditions, sample numbers, flaw detection status, etc., to further facilitate image processing.

11 is a TV camera, 12 is a manual setting device for flaw detection conditions, etc.
Reference numeral 13 denotes a display device, for example, a monitor television, on which a flaw detection image is displayed.

FIG. 5 shows an example in which a flaw detection signal is displayed as a flaw detection image on the display surface of the display device 13 according to the present invention.

In this example, as shown in FIG. 5a, the flaw detection image when there are defects 14 to 16 in the object 2 to be inspected is shown in FIG. The flaw detection image seen from the B plane is in the third quadrant 103 of the X-Y coordinate plane 14a, 15a
, 16a, and the flaw detection image seen from the 0-B-F-C plane is shown in the fourth quadrant 104 as 14b, 15b,
16b, the flaw detection image seen from the 0-C-E-A plane is the first
They are displayed in quadrant 101 as 14c, 15c, and 16c.

According to the embodiment of the present invention, as described above, flaw detection images viewed from three orthogonal directions can be simultaneously displayed on the same display screen, so that the efficiency of ultrasonic flaw detection can be significantly improved.

Further, the flaw detection image may be displayed in any one or two of the three quadrants, and the same effect can be obtained depending on the purpose of flaw detection.

In the embodiment shown in FIG. 1, the object 2 to be inspected is shown as a rectangular prism, but the present invention can also be applied to a cylindrical or other shaped object.
It has the same effect.

Further, although the case in which the number of variable angle probes 1 is one is shown, this is not limited to one, and it is also possible to use a plurality of them, without changing the effect.

As explained above, according to the present invention, it is possible to easily perform ultrasonic flaw detection in a three-dimensional three-dimensional area, and one of the flaw detection images viewed from three orthogonal directions using flaw detection signals is used. one on the display surface of a display device, or
Since all of them are displayed simultaneously, there is a remarkable effect that the efficiency of ultrasonic flaw detection can be significantly improved.

[Brief explanation of the drawing]

1 to 5 are diagrams showing an embodiment of the present invention. FIG. 1 is a perspective view for explaining the principle of ultrasonic flaw detection using the variable probe of the present invention, and FIG. The figure shows the X-Y
A coordinate diagram for explaining the procedure for displaying a flaw detection image on a coordinate plane, and Fig. 3 is an explanatory diagram of the temporal relationship of the X-Y axis sweep signals when displaying a flaw detection image on the X-Y coordinate plane of Fig. 2. , FIG. 4 is a block diagram showing the circuit configuration of the ultrasonic flaw detection apparatus of the present invention, and FIG. 5 is a diagram showing an example of displaying a flaw detection image according to the present invention. Explanation of symbols, 1...Variable angle probe, 2...
...Object to be inspected, 3, 4...Ultrasonic beam, 5
... Ultrasonic transceiver, 6 ... Trigger signal generator, 7 ... Sawtooth wave generation circuit, 8 ...
. . . Selection gate circuit, 9 . . . Scan conversion memory 13 . . . Display device (monitor television).

Claims (1)

[Claims] 1. In an ultrasonic flaw detection device using a variable angle probe, means for driving the variable angle probe in a direction intersecting a plane including the ultrasonic beam direction, and a means for displaying a flaw detection signal on a display device. An ultrasonic flaw detection apparatus comprising: means for displaying an image viewed from at least a direction perpendicular to a first driving surface of the variable angle probe among three directions perpendicular to a display surface.