JPH058781B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an ultrasonic flaw detection device for flaw detection of piping, etc., and more specifically, a transmitting probe that projects ultrasonic waves onto a member to be inspected, and the A receiving probe that receives the ultrasonic waves transmitted through the member, an attenuator that attenuates the intensity of the ultrasonic waves received by the receiving probe at a set ratio, and a display that displays the attenuated signal attenuated by the attenuator on a cathode ray tube. The present invention relates to an ultrasonic flaw detection device equipped with a device.

[Prior art]

Conventionally, to configure the display device in the above-mentioned ultrasonic flaw detection equipment, an attenuator attenuates an analog signal from a receiving probe that indicates the intensity of the received ultrasonic wave at a set ratio, and then based on the attenuated analog signal value. Then, the state of change in the received ultrasound intensity is
It is configured to display a waveform on a cathode ray tube with a logarithmic scale, and the display range is adjusted to display the waveform well within the image area of the cathode ray tube regardless of large changes in the intensity of received ultrasonic waves.In other words, attenuation processing is performed using an attenuator. By changing the attenuation ratio setting of the attenuator, adjustments can be made to match the change range of the analog signal value and the input range of the CRT. By reading the height on a logarithmic scale, it was possible to read the intensity of the received ultrasound in decibels, which indicates the attenuation state of the transmitted ultrasound.

For recording purposes, a terminal is provided to transmit an analog signal from the attenuator, that is, an analog signal value that has been attenuated by the attenuator, and based on the output signal value from that terminal, the waveform is equivalent to the waveform displayed on the cathode ray tube. A device was installed to print the graph on logarithmic scale recording paper, and the recorded data was used to compare and examine the measurement results.

[Problem that the invention seeks to solve]

However, when comparing and examining measurement results using recorded data, reading the data plotted on logarithmic scale recording paper is extremely troublesome due to the logarithmic scale, and reading errors may occur due to individual differences. Furthermore, if you try to obtain the decibel value of the received ultrasound from the recorded data,
There was room for improvement in data processing, such as the need to perform manual calculations to correct data for attenuation processing performed by an attenuator for range adjustment.

An object of the present invention is to enable recorded data processing to be performed accurately and easily without reading errors, and to omit artificial calculation processing for data correction for attenuation processing by an attenuator.

[Means to solve the problem]

The characteristic configuration of the ultrasonic flaw detection apparatus according to the present invention includes an A/D converter for an attenuated signal obtained by attenuating the intensity of the received ultrasonic wave at a set ratio by an attenuator, an output value c from the A/D converter, and the above. Calculating means for calculating an attenuation decibel value e of the output value c with respect to the reference value d based on a reference value d corresponding to an upper limit value in a display device that displays the attenuation signal on a cathode ray tube according to the following formula e=20logc/d. , an encoder for reading a decibel value f indicating the degree of change in the reference value d changed by the attenuator, and a correction calculation for the attenuation decibel value e from the calculation means using the decibel value f read by the encoder. The present invention is provided with a means and a means for digitally displaying the corrected decibel value g calculated by the means, and its functions and effects are as follows.

[Effect]

In other words, by digitizing the analog signal from the attenuator, that is, the analog signal value that has been attenuated by the attenuator for range adjustment, using the A/D converter, the value corresponding to the height of the waveform displayed on the cathode ray tube can be digitized. In addition to obtaining the output value c shown by Obtain the attenuation decibel value e of the output value c.

Then, by reading the attenuator setting value, that is, the attenuation ratio state of the attenuator in that range using the encoder, and then calculating backwards, the upper limit value (reference value d) displayed on the cathode ray tube in the attenuated state can be determined. Determine the decibel value f that indicates how many decibels of the upper limit displayed on the cathode ray tube corresponds to the state before attenuation processing,
Using the decibel value f, the attenuation decibel value e
By correcting the attenuation decibel value e, a corrected decibel value g is obtained that allows the magnitude comparison between before and after attenuation, and the corrected decibel value g is digitally displayed by a digital display means.

〔Effect of the invention〕

As a result of the above, it is possible to digitally record the decibel value of the received ultrasonic wave itself, which indicates the attenuation state of the ultrasonic wave that has passed through the inspected member, so when comparing measurement results, it is no longer necessary to read the logarithmic scale as in the past. The recorded data can be easily and accurately continued without any reading errors that tend to occur when reading a logarithmic scale.Furthermore, there is no artificial correction calculation for the attenuation process by the attenuator. The decibel value of the received ultrasonic waves can be obtained directly from the recorded data, and the efficiency of processing the recorded data can be greatly improved.

[Example] Next, an example will be described based on FIG. 1 and FIG. 2.

A transmitting probe 2 for projecting ultrasonic waves onto the member to be inspected 1 and a receiving probe 3 for receiving the ultrasonic waves transmitted through the member to be inspected 1 are provided, and information from the receiving probe 3 is provided. Based on this, the system is equipped with an analog display section 4 that displays the changing state of the intensity of the received ultrasonic waves as a waveform image as shown in FIG. A display device 6 is provided, and an ultrasonic flaw detection device is configured to detect flaws in the inspected member 1 based on the intensity information of the received ultrasonic waves displayed by the display device 6, that is, the attenuation information of the transmitted ultrasonic waves. There is.

The analog display section 4 in the display device 6 is provided with an attenuator 7 that attenuates the signal from the reception probe 3 at a set ratio, and the analog voltage signal after attenuation processing by the attenuator 7 is transferred to the cathode ray tube 4A. A waveform A with a height h proportional to the voltage value a of the analog signal
It is configured to display images on a cathode ray tube 4.
Display range adjustment in order to draw waveform A well within the image area _h0 of A, that is, adjustment to match the change range of the attenuated analog voltage signal value a by the attenuator 7 and the input range of the cathode ray tube 4A. By changing the attenuation ratio of the attenuator 6 and setting the height h of the displayed waveform A while taking into consideration the setting state of the attenuator 7,
By reading the logarithmic scale attached to the cathode ray tube 4A, the intensity of the received ultrasonic waves detected by the receiving probe 3 can be read in decibel values.

On the other hand, the digital display section 5 is configured with an analog signal value a that has been attenuated by an attenuator 7.
A measurement output terminal 8 that outputs the voltage in parallel with the input to the cathode ray tube 4A, and a reference output terminal 9 that outputs a reference voltage signal of a value b equal to the upper limit voltage value of the input range of the cathode ray tube 4A are provided. Child 8,
By providing A/D converters 10 and 11 that separately digitize the analog voltage signals from 9, the output value c transmitted from the A/D converter 10 between the measurement output terminals and the reference output terminal side Based on the reference value d transmitted from the A/D converter 11, the upper limit height _h0 of the image area of the cathode ray tube 4A and the height h of the displayed waveform A are determined.
The attenuation decibel value e, which shows the difference in decibels between
An arithmetic circuit 12 is provided which performs calculations according to (a).

e=20log c/d... (a) Then, based on the information from the auxiliary attenuator 7a that is linked to the attenuator 7, read the set value of the attenuator 7, that is, the set attenuation ratio, and calculate the set value from the reading result. A read decibel value f indicating how many decibels of received ultrasonic intensity before attenuation processing by the attenuator 7 corresponds to the voltage value b of the reference voltage signal (equal to the upper limit value of the input range of the cathode ray tube 4A) at the set value. An encoder 13 is provided for calculating the attenuation decibel value e from the arithmetic operation circuit 12 and a decibel value f read from the encoder 13. The calculated decibel value g, that is, the original decibel value of the received ultrasound intensity shown in the display waveform A, or in other words, the decibel value of the received ultrasound itself detected by the receiving probe 3 is digitally displayed. An electronic display 15 is provided so that the decibel value of the received ultrasonic wave can be directly read without reading a scale or the like.

In the figure, 16 indicates the calculated decibel value g, the attenuation decibel value e, the output value c from the measurement output terminal side A/D converter 10, and the reference output terminal side A/D converter 11.
This is a changeover switch for digitally displaying the reference value d from 1 on the electronic display 15 as an alternative.

[Another example]

Next, another embodiment of the present invention will be described.

The specific configuration for transmitting the reference value d can be modified in various ways, and these transmitting configurations are collectively referred to as reference value transmitting means 9 and 11.

Output value c from the A/D converter 10 for the signal from the attenuator 7 (that is, the analog signal value a that has been attenuated by the attenuator 7)
and the reference value d from the reference value transmitting means 9, 11.
Based on the equation (a) above, the attenuation decibel value e
The specific calculation configuration for calculating can be changed in various ways, and these calculation configurations are collectively referred to as calculation means 1.
It is called 2.

Furthermore, in addition to the digital display of the calculated decibel value g calculated by the subtractor 14, it is also possible to apply a print display on the recording paper P in addition to the electric light display, and these various display configurations are collectively referred to as digital display. It is called means 15.

Further, as shown in FIG. 3, the display device 6 includes an analog display section 4 using a cathode ray tube 4A.
and the digital display section 5 provided with the digital display means 15 may be constructed as separate units.

[Brief explanation of drawings]

1 and 2 show an embodiment of the ultrasonic flaw detection device according to the present invention, FIG. 1 is a schematic circuit diagram, and FIG. 2 is a diagram of a display device. FIG. 3 is a diagram showing another embodiment of the present invention. 1... Member to be inspected, 2... Transmitting probe, 3...
Receiving probe, 4A... Braun tube, 6... Display device, 7... Attenuator, 9, 11... Reference value transmitting means, 10... A/D converter, 12... Arithmetic means, 13... Encoder , 14...subtractor, 15
... Digital display means, c ... Output value, d ... Reference value, e ... Attenuation decibel value, f ... Read decibel value, g ... Calculated decibel value.

Claims (1)

[Scope of Claims] 1. A transmitting probe 2 that projects ultrasonic waves onto a member to be inspected 1, a receiving probe 3 that receives the ultrasonic waves that have passed through the member to be inspected 1, and reception by the receiving probe 3. An attenuator 7 that attenuates the intensity of the ultrasonic wave at a set ratio, and a display device 6 that displays the attenuation signal attenuated by the attenuator 7 on a cathode ray tube 4A.
An ultrasonic flaw detection apparatus comprising: an A/D converter 10 for the attenuated signal;
Based on the output value c from 0 and the reference value d corresponding to the upper limit value on the display device 6, the attenuation decibel value e of the output value c with respect to the reference value d is calculated by the following formula e=20logc/d. a calculation means 12 for calculating, an encoder 13 for reading a decibel value f indicating the degree of change in the reference value d changed by the attenuator 7, and a decibel value f read by the encoder 13;
means 14 for correcting the attenuation decibel value e from the calculating means 12 using
The ultrasonic flaw detection apparatus is provided with means 15 for digitally displaying the corrected decibel value g calculated in step 4.