JPS6176952A - Method and device for flaw detection of nonmetallic material by infrasonic wave - Google Patents

Abstract

PURPOSE:To execute efficiently and economically flaw detection by making incident an infrasonic wave on a material to be tested and comparing the intensity of the acoustic wave transmitted through or reflected from the material to be tested. CONSTITUTION:The electric signal of 1-25C/S transmitted from a signal trans mitter 1 is amplified by an amplifier 2 and is converted to acoustic energy by an acoustic wave receiver 3.The infrasonic wave is made incident on the material M to be tested consisting of a non-metal. The infrasonic wave is re ceived by an acoustic receiver 4 by which the wave is converted to the electric signal. The signal is further amplified by an amplifier 5 and is displayed on a Lissajous' figure, etc. If there is a defect in the material M, the intensity of the acoustic wave received by the receiver 4 is different and therefore the intensity is compared by drawing the figure on a display device 6, by which the presence or absence of the defect in the material M is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an in-seven laser diode for non-destructive testing of materials such as wood and concrete, structures made of these materials, or structures made of metal lined with rubber or resin. This invention relates to a method and apparatus for causing 42 scratches on non-metallic materials by Tsuku waves.

Conventionally, as a non-destructive testing method using sound waves, an ultrasonic flaw detection test method, for example, JIS 22344 [m-sonic flaw detection test method using pulse reflection method for metal materials] has been used.

Generally, as the frequency used increases, the directivity of the sound layer improves, but the radiance increases.

Therefore, compared to ultrasonic waves and audible sound waves, the in-7 laser beam has less energy loss.The present invention takes advantage of this property and uses materials with a large vcR of sound waves, making it easier to detect flaws with such precision. If not, for example, it is used to detect defects in wood, concrete, etc., such as cavities, or to detect defects in metal, etc., lined with rubber, etc.

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

To explain the maf configuration, the frequency is variable, 1 to 25C.
/'S's Denki Igo No. J2 believer I J equipment I, for example 1r
Connect a buzzer, etc. to the amplifier 2 (this amplifier 2 may not be used, but Figure 1 shows the case where it is used). Connect.The sonic person Igoko converts the electric signal into energy with sound and inputs the sound i′fLs1 into the material under test M, and this sound 1 skin S
1 is received by a sound-to-skin receiver 4''c consisting of a microphone, etc., converted to electrical g, and amplified by an amplifier 5. (This amplifier 5 may not be used, but it is shown in the drawing. (The case in which it is used is shown.) Connected to a display device 6 consisting of an on-loss hoop or the like.

Also, by integrating the sound 7 skin input structure and the sound wave reception device, using the sound wave input receiver 7, the sound source 8 device 1, the amplifier 9 device 2, and the rf
The wave receiver 7, the amplifier 5, and the display 6 may be connected.Although the drawing shows the case where the amplifiers 2 and 5 are separate, they may be integrated.

Next, to explain the operation, the transmitter 1 is connected to a power source, the receiver 1 transmits an electric signal with a frequency of 1 to 25 C/S, and the amplifier 2 amplifies it depending on the heart condition. IJF3
Or, by sonic wave reception r-7 (converted to - with l energy, inject an in-7 run second wave, that is, sound l skin S1, into a material M made of a non-11, genus substance, and The sound wave receiver 4 or the sound wave receiver 7 receives the sound wave S1 or S2 and converts it into an electric signal Af3, which is amplified by the amplification width 2i5 according to the heart attack, and is displayed on the display 6. In this case, as shown in Fig. 3, if there is a defect in the test material M, the sound wave S1 received by the sound wave receiver 4 in that part is compared to the healthy part. Since the strength of the sound waves differs, by drawing a figure on the display 6 and comparing the two, it is possible to know whether there is a defect f in the material under test M.Fourth.
Figure 1 An example of using the soil sound wave receiver P7, the reflected sound wave S
Fig. 5 shows the flaw detection state when the substance K made of gold J1 or the like is lined with the test material M, for example, rubber. In both cases in the figure, the sound (pL
Since the strength of S2 is different, a figure is drawn on the display 6 and compared to detect the defect I in the material M to be tested.

The method and device for preserving non-metallic materials using infrasonic waves according to the present invention have been described above, and the present invention can provide the following effects.

■Efficiently and economically damage the interior of materials such as wood and concrete.

2) When metal etc. are lined with rubber or grease, it is possible to easily know the internal stain condition.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIGS. 1 and 2 are block diagrams. Figures 3 to 55 are schematic diagrams showing flaw detection conditions. 1.Flash transmitter 2.5.Intensifier 3..+) Nobuko Nobuko 4.Sound wave receiver 6.Display device 7
・・a adult receiver■・・・Defect Substance M consisting of K-4 group, etc.・・Test material 31. S2...-Soundwave Figure 3 Sl S Figure 4 Figure 50

Claims (2)

[Claims] (1) A transmitter emits an electrical signal with a frequency of 1 to 25 C/S, and this signal is transmitted directly or via an amplifier to a sound wave receiver or a sound wave receiver to convert it into acoustic energy. Infrasonic waves are applied to a test material made of a non-metallic substance, and the sound waves transmitted or reflected through the test material are received by a sound wave receiver or a sound wave receiver and converted into an electrical signal.
This is a flaw detection method for non-metallic materials using infrasonic waves that are connected to a display device either directly or via an amplifier. (2) The transmitter emits an electrical signal with a frequency of 1 to 25 C/S, and this signal is transmitted directly or via an amplifier to a sound wave receiver or a sound wave receiver to convert it into acoustic energy. Infrasonic waves are applied to a test material made of a non-metallic substance, and the sound waves transmitted or reflected through the test material are received by a sound wave receiver or a sound wave receiver and converted into an electrical signal.
This is a flaw detection device for non-metallic materials using infrasonic waves, which is connected to a display device either directly or via an amplifier.