JPS6050415A - Ultrasonic wave apparatus for searching abnormal bodies buried in sea bottom - Google Patents

Abstract

PURPOSE:To seach the shapes of mines and the like buried in the sea bottom and the like accurately and to display the shape on a CRT in three dimensions, by transmitting monopulse ultrasonic waves having a short pulse width from crossed-array wave transmitting and receiving devices, which are arranged on concave surfaces, performing scanning in two dimensions, receiving the reflected waves, and performing processing. CONSTITUTION:A plurality of concave type electromagnetic induction type wave transmitter groups and a plurality of wave receiver groups are arranged in cross arrays so that they crossed at right angles. A monopulse ultrasonic wave is transmitted from a wave transmitter array 2 to an object. The reflected wave is received by a wave receiver array 3. The scanning of the object at the sea bottom is performed in a two-dimensional plane. The reflected data is processed and converted into a digital signal by an A/D converter 9. The signal is stored in an RAM10. Based on the object read out of the RAM10, the contour of the object is strengthened, and noise components are removed. After these processings, the object is displayed on a CRT21 as a colored three-dimensional picture.

Description

Detailed Description of the Invention This invention relates to a device for detecting sunk J115 ordinary objects such as bullets buried under the bottom of the seabed. , and by converting the concave surface arrangement 9-day square array transmitting/receiving Beno type into ?3-track resolution, and mechanically scanning this 1-wave receiver in 2-dimensional manner, J. Take 1q of data,
Image processing I in the receiving system! 11 circuit to the right, image 1 image fidelity 11
] Sa L! This relates to a device that can display three-dimensional images on caRT and accurately explore the shape of objects.

At present, there are still a number of areas left in the world, and there are a large number of
-,)j971...■It is determined that (1) remains in ■.

Undersea civil engineering work in these TI+j areas IT% 5
``Conducted 1 million lightning surveys to ensure construction safety.''
； ■Louie: ``Turtle C to J
-It takes 4ν'C to do something. Conventionally, magnetic surveying has been used as a method for detecting AW lightning buried beneath the 7N ocean floor. In order to determine whether or not it is a metal object, a diver conducts a -C diving exploration, and a magnetic test is conducted to determine the jTL 1!1Q.However, the strength of the magnetic field from a mine varies in relation to the earth's magnetism. Because of the danger, underwater exploration is carried out on the assumption that even the smallest magnetic reaction may be a mine.As a result, the time and cost required for these operations are enormous, and J5, and even the construction work, are being carried out. Due to the deepening of the water entering the port, the amount of work performed by C divers and the 4T limit for each diver's work have increased, and Rikihi believes that the current exploration method is not safe enough. 14 has not been achieved,
Moreover, it is inefficient and wasteful. Therefore, there is a demand for the development and practical application of equipment capable of remote exploration, which can be automated and labor-saving as an alternative to underwater exploration. It was invented to respond.

Fig. 1 shows an example of an electrical circuit system diagram of the present invention. It is a power supply device, and the wave device array 2 converts this E-no-pulse drive into monopulse ultrasonic waves.
It is a beta organ. 3 is a transmitter array that returns from the λ j quasiform on the ocean floor (QJ) and a receiver array that converts Rikihi's monopulse ultrasonic waves into electrical signals.

The output of the receiver array 3 is a weak electric current (because there is a high frequency signal).
Lower 1m0Conlrol) Input to circuit 6 and transmit ultrasonic wave)
11'1 of the distance 11 is increased by 1'1' to compensate for the diffusion attenuation. Communication station with 64 SYC circuits 1. The logarithmic power amplifier 7 supplies the logarithm 1 IL, and the STG circuit 8 supplies J to compensate for the loss of ultrahigh waves jO in the γt bottom sediment. The amplifiers 4 and 8 of the TC circuit 8 convert the analog signal processed by the converter 9 into a digital signal, and M
)10.

On the other hand, 11 +J, there is a position detector, horizontal direction XY
It detects seven addresses that are the same as the address in the vertical direction and inputs them to the C control device 12 to control the output data of the A/''D converter 9 to be written to the corresponding address on the memory 10. 13 is a reference plane level that is set to an arbitrary value δΩ, and by dividing the data read out from the divider circuit 14 by the reference plane level 13, the level change is emphasized. The level will become noticeable.

The data resulting from this division is stored in the digital memory 15, and the readout data is compared with a predetermined level by a comparator circuit 1G, and is converted into 1-bit data by comparison with the level. This clarifies the boundary line of the image of the object. The 1-data data (stored in the J digital memory 17 and read out) converted into m data by the comparator 16 is added by the integrating circuit 18 to the data of 27 addresses above, below, to the left, and to the right, centering on the ζ゛ measurement address. Isolated noise components such as pebbles existing near the object A are removed.The data subjected to the hanging-averaging process by the integrating circuit 18 is stored in the digital memory 19,
The data stored in each memory 10, 15, 17.
It is read/7) output to the device 2-1. .

CRT device RY 21 TeLt object 1111”l<:+
X-Y,'X-Z,'+"7 fault shadow ψ] Three-dimensional XYZ
Color display overlays the child dimension image by data.

Figure 2 shows the power generated from the high-voltage power supply 1 in Figure 1 (Figure C is a comparison of Novals ultrasonic waves and conventional 1-1 impulse ultrasonic waves). The figure shows the waveforms of each A-silo snip at each point in the 1-in-burst super wave. (a) The figure shows J5 (, Ta has a pulse width of 22, and A-wave carving is 41F) 51 waves.
This is the pulse width of J. On the other hand, in the figure (b), the pulse width 1N) 23 must be recessed with at least 10 wavelengths in order to drive the oscillator, and the pulse width 1N) 23 is the monopulse pulse width 10 times or more compared to a22. Therefore,
(1)) As shown in the figure, the Enopulse method (see Figure 1) has a shorter pulse width than the conventional ultrasonic emission method, and can improve self-analysis ability. 3 shows a diagram of the structure of the transducer array 2, 33 in FIG. A plurality of X-ray receivers are arranged in a line on the fixed plate 2/I to form the receiver array 3. As shown in the figure, the transmitter arrays 3 are arranged in a cross shape so that they are perpendicular to each other, and the transmitter 2 is arranged so that their ultrasonic beams are focused on the object.
The heights of the transducers 3a and 3a are arranged on the fixed plate 24 so that they are each concave.

FIG. 4 is a diagram showing the exploration and art dealer display according to the present invention, and in FIG. 4 (a) the ultrasonic beam 25 from the transducer array 2°3 is focused on the object 26. .

The transducer arrays 2 and 3 can scan the target object 26 two-dimensionally, and can geometrically scan the XY horizontal plane. is X7
Therefore, 30 has 77 sides. Also, (b) (c)
, (d) shows a method of displaying images on the CRT device fa21 in Fig. 1, and (b) shows a Y7 tomographic image cut in the YZ plane 4. Yes, it covers YZ picture 1/31 at the position of lag on the X axis.(c)l
:Lt1+, +, shows a tomographic image of ii statue 32
Display. ((1) The figure shows both images of the X71I7i layer cut in the YIl111 direction on the
, (+1 ), (c ), ((+ > 1 of the object in the figure
Images of the i-layer in 33 directions at the position r of one arc can be displayed by the C1 machining device. Next, knead 9 and line <j C
In addition, laboratory experiments showed that the present invention's loading force X tN bottom sedimentation 5T fabric IA'' test was effective compared to the conventional limb J, rishi (,J)
Since 1111 has been published, I will explain the main points. The experiment used was an electromagnetic induction wave device 6 with a diameter of 100 mm.
11! Did you receive J? 5+ Niiei child/I 0111
111(7) Disc oscillator 16 tl! J 's' is used, it is attached in a Tas shape, and the heat is super 1゛1 wave - 11! ,'',1/)・2.5m.As a result of preliminary experiments, )X wave height L'' is 90
Fill-nl-1500V, t<le), width 40
us, Chuetsu Frequency VV 25. K11'7 ('Directivity of ultrasonic beam 131 cliff decrease'1! Angle approximately: 31α, underwater resolution width was 25 cm at focal point #t 2.5 m).

The image processing is equipped with a noise removal device that clarifies the emphasis boundary line of the level change, and the image display is made up of 30 x 30 x 30 pixels.
The element has a resolution of 5 cm. Using this device, 1971 cans (600φX
900 mm) was suspended in water, and a transducer was installed so that the target object was at a focal length of 2.5 m, and an exploration experiment was conducted. In the experiment, three-way tomographic images of X'l/, XZ, and Y7 were taken with the object horizontal and tilted at 7 degrees, 20 degrees, and 3 degrees and 11 degrees.

As a result, the two-way tomographic image (J) was easy to visualize the shape of the actual object. Even objects that are
Images seen from the Y, XZ, and YZjj directions were also observed, which is something that cannot be seen in conventional combined wave exploration, and can be said to be a groundbreaking result.

Furthermore, as a simulated experiment for the exploration of 11σ mines buried at the bottom of
J at 5cm position! ]l! Set up and conduct exploration experiments.

As a result, super? ) Despite the exploration of the wave attenuation constant in the sand, we were able to obtain a two-way tomographic image of 1!7 by processing the images 3, and the conventional 11:
j P is an object buried below 50 cm below the bottom of 7f11 (it is said that 51 undetectable "1" ability, but this fire u
1 (v, "by i, r') #7 Objects buried 25 cm below the bottom can be clearly detected. It turns out that it can be detected accurately, and Ilj Ii:
(Sinking difference 1: ; The device of this invention can contribute to improving the efficiency of object exploration work, etc.), and has a great practical effect. child.

Figure 5 [J Using the device of this invention C buried in the seabed 7. Shishi C is here (how many? lr, gun bomb analysis 11th generation) last month ■ Tatsumi 7;
This is a diagram showing an example of a 14-degree survey of the Earth. This shows the case of high wave exploration. (ri) Figure C' shows a case where the water is deep and the transducer cannot be hung on the bottom of the ship, C', and a case where the transducer is installed on a pedestal and the pedestal is lowered to the bottom surface -1- for exploration. .

In the figure (a), the transducer arrays 2 and 3 are removed on the deck of the exploration vessel 34. The ultrasonic beam 36 originally transmitted from the transmitter A1 and Noy2 (J) is reflected by a foreign object 38 buried in the seabed 37, and the receiver array 3 receives this reflected beam. (1)) In the figure, a pedestal 40 is installed on the seabed 37 so as to be positioned above and over the abnormal object 38.

The main body 3 is mounted on the pedestal 40 so that the transducer array 2.3 is movable in the X and Y directions.
5 is connected by a couple 39 for sending signals and a moving horn N source for the drive device.

As explained above, if the device of the present invention is used in combination with the conventional magnetic survey method and Inno1, it will be possible to detect the shapes of common items sunk on the seabed, such as thunderbolts and bombs, which were impossible with magnetic survey. Since it is possible to accurately display cross-sectional images in three directions, there is no need for the diver to conduct a confirmation survey, which improves the efficiency of the survey work and is beneficial in terms of safety measures. This device is not only used to detect abnormal objects buried under the sea, such as mines and scorched shells, but also to detect sunken ships, sunken trees, and other objects buried under the sea, as well as the shape of objects that have been knocked into the earth and sand during underwater civil engineering works in rivers, lakes, and other areas. Exploration Zuruse: ``Answering system jL and ζ issue III Zuruga Hisaru.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, FIG. 1 is an electric circuit system diagram of the present invention, and FIG. 2 is a comparison of the characteristics of the inventive pulsed ultrasonic wave with the conventional h-Leverst sonic wave. Figure 3 shows the transducer J Louis 4M71 according to the present invention.
Figure 4 shows the use of the device of the present invention. 3 wave exploration picture 1 (J
+A figure showing the display method, Fig. 5 shows an example of 1:xl in which 17 Iη submerged abnormal objects are collected using the wood invention device. 1 Takatsuki 2 power supply device 2) Wave wave device Nori 3 Wave receiver array 4 Amplifier 5j Detector G, 13SrC times (“H (7ta・j number”)
1'1 width vessel 9 △/[) change (ku; vessel 10.15.-1
7.19 γr digital meter 11 position detector 12 system 9
1I equipment 13 Reference plane level 14 Divide circuit 1G comparison circuit 18 Multilayer circuit 20 Switch 21 CR1-device 22 Pulse width 'T' a 23 Pulse width -11] 24 Fixed plate 25 Ultrasonic beam 26 Target object 27 Exploration iiJ depth 2 g Figure (b) ・°"]n38.・

Claims (1)

[Claims] A transmitter array in which a plurality of electromagnetic induction transmitter groups that transmit monopulse ultrasonic waves with a short pulse width are arranged in a concave shape, and a transmitter array that receives ultrasonic waves from the transmitter group. A receiver array in which a plurality of receiver groups for converting into electrical signals are arranged in a concave shape and perpendicular to the JZ waver array; The above-mentioned feed J3. The transducer array is scanned over a two-dimensional plane, and the monopulse ultrasonic waves from the transducer array are sent to the target object. =1 data output means, a reflection data processing means including a device for emphasizing the anti-Q·j data, a device for emphasizing the ring of two objects >11, and a device for removing and covering miscellaneous components; storage means for storing data of the means and reflection data processing means; and object display means 14u for reading data from the storage means and displaying a two-dimensional 1'17i layer image or a three-dimensional frame image related to the object. What is the characteristic of the ultrasonic waves that sink to the bottom? inspection device.