JPS63229362A - Apparatus for measuring sound field characteristic of ultrasonic wave - Google Patents

Abstract

PURPOSE:To enhance measuring accuracy, by automating the measurement of a sound field by mounting an X-Y scanner to a probe holder or an ultrasonic wave reflecting body. CONSTITUTION:A probe 1 is driven to an initial position S to start a measurement. Ultrasonic beam is reflected by an ultrasonic wave reflecting body 3 to be detected by an ultrasonic flaw detector 5 and a central operation apparatus 6 stores an echo peak in a memory apparatus 7 through an A/D converter 10. The apparatus 6 indicates the driving of a pitch X1 to a scanner indication apparatus 9 on the basis of an inputted initial condition and an X-Y scanner is moved by X1 by a pulse motor 11-1. When the movement of a scanning range X2 in an X-direction is finished, a scanning range Y2 in a Y-direction is similarly moved to taken in and store data. The apparatus 6 performs the indicated imaging processing of the inputted data to display a processing result on a display apparatus 8. By this method, the sound field characteristic of the probe 1 can be measured with high accuracy. As a result, the discovery of the abnormality of the probe 1 at an early stage or the control of the deterioration state thereof can be easily performed and detection accuracy can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for measuring the characteristics of a sound field created by a probe used in ultrasonic flaw detection.

[Conventional technology]

The detection characteristics of defects in materials by ultrasonic flaw detection are greatly influenced by the acoustic field characteristics of the ultrasonic beam emitted from the probe.

Sound field characteristics are expressed by the intensity distribution of the beam in the ultrasonic medium, etc. In the case of a water immersion probe, an ultrasonic reflector is placed in the water and the ultrasonic waves are emitted from the probe and reflected by the reflector. The reflected echo height of the beam is measured and displayed.

These sound field characteristics depend on the transducer material of the probe.

It varies depending on the shape, excitation conditions, etc., and also changes depending on use. When the sound field characteristics of the probe change, the detection characteristics of defects in the material change, so harmful material defects may not be detected, or harmless defects, signals from non-defects, or simple noise may be treated as harmful defects. This may result in erroneous detections such as

Therefore, in order to conduct ultrasonic flaw detection of materials with high precision, it is necessary to measure the sound field characteristics of the probe used, and to set conditions suitable for the characteristics, such as the number of probes, their arrangement, the distance between the probe and the material, etc. need to be set. Furthermore, even if the same probe is used, it is necessary to perform appropriate management by measuring its sound field characteristics.

Conventionally, to measure the underwater sound field of an ultrasonic probe, the probe and ultrasonic reflector are placed in the water, and the positional relationship between the two is manually changed to detect the reflected echo of the ultrasonic beam. Since the height was measured, calculated, and displayed, there were problems in that it was not possible to take many measurement points, there were limits to accuracy and display methods, and it took a long time to measure.

[Problem that the invention seeks to solve]

The present invention aims to significantly improve the accuracy of ultrasonic flaw detection by automating the sound field measurement of an ultrasonic probe to obtain highly accurate data in a short time and to enable various displays. shall be.

[Means for solving problems]

The configuration of the device of the present invention will be explained with reference to FIG. A probe holder 2 holding a probe 1 and an ultrasonic reflector 3 positioned opposite to the probe holder 2 are arranged in the liquid. An XY scanner 4 is attached to the probe holder 2 and is movable in steps in the X and Y directions. An ultrasonic flaw detector 5 is connected to the probe 1 via a probe holder 2, and the ultrasonic flaw detector 5 is connected to a central processing unit 6 via an A/D converter. The bag @6 is connected to a storage device 7 and a display device 8.

Further, the central processing unit 6 is connected to a scanner instruction device 9, and the scanner instruction device 9 is connected to the XY scanner 4 via a pulse motor 11.

Although FIG. 1 shows the XY scanner 4 attached to the probe holder 2, the probe holder 2 is fixed and the XY scanner 4 is attached to the ultrasonic reflector 3. It may also be movable. As the ultrasonic reflector 3, in addition to the spherical one shown in FIG. Set perpendicular or parallel to the central axis.

The A/D converter 10 is not necessary when using a digital ultrasonic wound instrument. The storage device 7 includes a RAM, a floppy disk, etc., and the display device 8 includes a CRT.
There are displays, printers, etc. To move the XY scanner 4 according to instructions from the scanner instruction device 9,
In addition to the pulse motor 11, a servo motor or the like may be used.

[Effect]

The operation of the device of the present invention will be explained using the examples shown in FIGS. 1 and 2. Probe name, deep wound name 2 reflector name.

Frequency 2 frequency bandwidth, deep wound gain (sensitivity).

Initial conditions such as scanning range (X2, Y2 in Figure 1), data acquisition pitch (XI, Yl in Figure 1), etc. are input to the central processing unit 6 (initial conditions manual step 1; hereinafter, steps in parentheses are (omitted), the central processing unit 6 clears the memory 2), drives the probe 1 to the initial position S (initial position movement = 3), and starts measurement (4).

When the ultrasonic beam emitted from the probe 1 is reflected by the ultrasonic reflector 3 and detected by the ultrasonic flaw detector 5 after passing through the probe 1 (data acquisition: 5), the A/D converter 10 detects the ultrasonic beam. A/D conversion to convert reflected echo height into digital data:
6), the central processing unit 4A 6 reads this and stores it in the storage device 7.
(memory = 7). Next, the central processing unit 6 instructs the scan instruction device 9 to drive the pitch X1 based on the initial conditions previously input to it, the device 9 energizes the pulse motor 11, and the XY scanner 4 Drive probe 1 in the X direction by a predetermined pitch X1 (X-axis movement =
8) Do. The central processing unit 6 subsequently similarly takes in measurement instructions and detection data, and stores the detection data in the storage device 6 (5 to 9) 6X direction scanning range X
When the movement of 9.2 is completed (9), the central processing unit 6 moves 9.2. The probe 1 is moved to Y via the indicating device 9 and the
Y-axis movement by a predetermined pitch Y2 in the direction: 10
), the moving direction in the X-axis direction is switched to the opposite direction from the previous time (11), and data is captured and stored in the storage device 7 while moving in the same manner on the X-axis (5 to 8). The measurement ends when the movement of the Y direction scanning range Y2 is completed (12
), file (-file name for probe measurement data) (16, 17), and store in storage device 7 (17)
).

When replacing the probe 1 with another probe and measuring the probe (18=N), initial conditions are input (1) and measurements are carried out in the same manner as described above (1 to 18).

When measurements are not being performed, such as when measurements are completed for all required probes, the central processing unit 6 performs imaging processing in steps 19 to 21. That is, when a file name is input (19), the central processing unit 6 checks whether the input file name exists in the storage device 7 (20), and if it exists, it stores the file name in the storage device 7 (20). 21), selects the visualization process specified by the input (22), performs the selected visualization process on the recalled data (23) and displays it on the display device 8. (23)
.

Measurement results can be displayed, for example, with a three-dimensional sound field profile as shown in Figure 3, a two-dimensional sound field cross-sectional view as shown in Figure 4, and underwater distance characteristics and effectiveness as shown in Figure 5. The beam width, the underwater sound field transversal diagram as shown in FIG. Execute processing. These are displayed on a display device 8 consisting of a CRT display. Note that the information may be displayed on the printer instead of or together with the display device 8.

〔Example〕

Frequency: 2MHz, frequency bandwidth: N, B, (narrow band).

Vibration dimension: 10X10os, transducer material: zircon/lead titanate porcelain, flat type probe, flaw detector resolution: 1. Pulse energy: MAX, rejection: Off, sensitivity: 26db, diameter 28.0
Using a spherical ultrasonic reflector of m, the scanning range is set in the X direction: 0. Assuming O5 nm, Y direction: 2 mm, number of data in X direction: 280 pieces, number of lines in Y direction = 90,
The sound field characteristics were measured.

The sound field profile (three-dimensional display) of the measurement results is shown in Figure 3, the cross-sectional view of the sound field is shown in Figure 4, the underwater distance characteristics and effective beam width are shown in Figure 5, and the horizontal underwater sound field at the Y direction position = 38I. The retention diagrams are shown in Figure 6. From these measurement results, the sound field characteristics of the probe can be accurately recognized.

〔Effect of the invention〕

According to the method of the present invention, the sound field characteristics of an ultrasonic probe can be measured with high accuracy and efficiency, and can be displayed using various methods that meet various needs.

Therefore, when performing ultrasonic flaw detection on various materials, the optimum placement of the probe and the optimum setting of flaw detection conditions can be performed, and furthermore, it is possible to detect abnormalities in the probe at an early stage and manage the state of deterioration, making it easy to detect material defects. Accuracy is significantly improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. FIG. 2 is a flowchart showing an overview of the control operation of the central processing unit 6 shown in FIG. FIG. 3, FIG. 4, FIG. 5, and FIG. 6 are drawings showing the measurement results by the above-mentioned embodiment apparatus, and all of them show graphs printed out by a printer of the measurement results. 1: Probe 2: Probe holder 3: Ultrasonic reflector 4: XY scanner 5: Ultrasonic flaw detector 6: Central processing unit 7: Storage device
8: Display device 9: Scanner instruction device 10: A/
D converter 11-1.11-2: Motor

Claims (1)

[Claims] a probe holder that holds the probe immersed in the liquid;
an ultrasonic reflector positioned opposite the probe in the liquid; an XY scanner attached to the probe holder or the ultrasonic reflector; and an ultrasonic reflector connected to the probe. a sonic flaw detector, a central processing unit connected to the ultrasonic flaw detector, a storage device and a display device connected to the central processing unit, a scanner instruction device connected to the central processing unit and the XY scanner; A sound field characteristic measuring device for an ultrasonic probe, comprising: