JPS5837001Y2 - Ultrasonic flaw detection equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an ultrasonic flaw detection device capable of recording the flaw detection position of a probe.

The most common method of flaw detection using ultrasonic waves is called the pulse reflection method, in which the reflection of ultrasonic pulses from the material to be inspected is observed on a cathode ray tube.

In this pulse reflection method, since the probe is arbitrarily moved over the surface to be inspected, it is not possible to accurately determine the flaw detection position, and there has been a strong demand for a device that can measure and record these positions.

To record the position of such a probe, for example, during an in-service inspection of a nuclear power plant, a beacon that generates sound waves and a receiving sensor are used to measure the position.

Such conventional ultrasonic flaw detection equipment is designed to be measured in a large-scale factory or permanently installed at a specific location, making it unsuitable for portable use.
Since handling is complicated, reproduction operations are also relatively difficult.
The reliability of the method itself was also lacking.

This invention was made to eliminate the above-mentioned drawbacks.
The purpose of the present invention is to provide an ultrasonic flaw detection device capable of recording flaw detection positions with excellent reproducibility and reliability using a simple mechanism while maintaining the portability of the device.

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

Figure 1 shows the ultrasonic flaw detection device according to the present invention applied to a welded part of a straight pipe and an elbow. In the figure, 1 is a straight pipe, 2 is an elbow, 3 is a welded part, 4 is a flaw detector, and 5 is a probe. Indicate each child.

Further, 10 and 20 indicate a sheet and an optical detection section that were added to the conventional device.

In the figure, the sheet 10 is a sheet of paper or film with a checkered pattern that does not easily reflect light, which does not significantly affect the transmittance of ultrasonic waves, and has an appropriate width depending on the flaw detection area, that is, the surface to be inspected. Paste or temporarily fasten something.

FIG. 2 is a detailed cross-sectional view of the optical detection section 20 additionally installed inside the probe 5. It is installed near the transducer 5a that emits ultrasonic waves 5S, 20a is the light source, and 20b is the light source. The focusing lens 20C is called an image sensor and is a detection device containing a photodiode.

The operation of the ultrasonic flaw detection device according to the present invention will be explained below.

Ultrasonic waves 5S generated by the probe 5 are applied to the test surface through a sheet 10 placed in close contact with the welded portion of the straight pipe 1 and the elbow 2 or the test surface near the welded portion, Ultrasonic flaw detection is performed by displaying the state of ultrasonic pulses reflected by the surface to be inspected or flaws in the material on the cathode ray tube of the flaw detector 4.

Since a sheet material is selected that does not have a significant effect on incident and reflected waves of ultrasonic waves, the presence or absence of C) 10 is considered to have almost no adverse effect on normal flaw detection operations.

On the other hand, light rays generated from a light source 20a installed in the probe form a bright spot on the sheet surface by a focusing lens 20b.

If this bright spot is on the mark 10a attached to the sheet 10, the amount of reflected light is small, and on the sheet surface other than the mark, the amount of reflected light is large.

Therefore, the mark can be detected by installing the image sensor 20C at the position where the amount of reflected light is greatest, and the mark can be calculated in accordance with the moving distance of the probe that is moved parallel to the test surface and the sheet surface. A numerical value is obtained.

That is, the position of the probe 5 can be stored or recorded in the flaw detector 4 based on the interval between the checkered marks attached to the sheet 10 and the count value.

In this way, by constructing an optical system that can separately count each of the vertical lines and horizontal lines of the checkered mark on the sheet 10 and also identify the direction of movement, the counted value of the mark and the flaw detection data can be recorded on a magnetic tape or the like. It can be memorized reliably, and the flaw detection position can be determined and the flaw detection results can be reproduced.

In the embodiments described above, the reflectance of the mark was lowered relative to the sheet, but the opposite configuration is also possible, and the interval between the lattice stripes can also be changed as appropriate depending on the shape of the surface to be inspected.

As is clear from the above explanation, according to the ultrasonic flaw detection device of the present invention, there is no need to make the shape of the probe large, and the optical detection section added to the probe can also have a simple configuration. It is easy to handle and allows reliable measurement and recording.

Furthermore, even if the shape of the surface to be inspected is complex, it can be easily recorded by bringing a marked sheet into close contact with the surface to be inspected, and flaw detection accuracy can also be improved by reducing the grid spacing.

Furthermore, since the structure and handling are simple, the entire device can be downsized and can be easily moved and operated by one person as a portable device.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an embodiment of an ultrasonic flaw detection apparatus according to the present invention, and FIG. 2 is a detailed sectional view of the embodiment. 1...straight pipe, 2...elbow, 3...
...Welded part, 5...Probe, 10...
- Sheet, 20... Optical detection section.

Claims (1)

[Scope of utility model registration request] Marks are attached as indicators of positions that can significantly change the light reflectance, and the points are marked without significantly affecting the ultrasonic transmittance.
In addition, it includes a sheet placed on the surface to be inspected, a light source that irradiates this sheet, and a detection device that measures the intensity of reflected light from this light source to read the mark, and also irradiates the sheet through the sheet and onto the surface to be inspected. An ultrasonic flaw detection device comprising a probe that emits ultrasonic waves, and capable of recording a flaw detection position of the probe from a read value of the detection device.