KR100706023B1 - Blade type acoustic wave measuring device and its system - Google Patents

Abstract

Disclosed are a blade type acoustic wave measuring device and a system thereof.

The present invention generates an input wave including a penetration rod including a control cable for transmitting a control signal of a ground control device, a signal generator for generating a predetermined input wave, and a control signal received through the control cable. A first frame in the form of a spatula including a control blade for starting or terminating, the penetration rod, the signal generator and the control unit, and a penetration blade disposed in a direction in which the penetration rod is inserted, and a direction in which the penetration rod is introduced. A pair of second frames connected to the side of the penetration blade and arranged in parallel to each other, and are disposed to face each other at regular intervals through the second frame, thereby propagating the input wave to the ground, The plurality of transducers for receiving the elastic waves passing through the ground and the second frame to maintain parallel spacing And a third frame having a penetration blade connecting both ends of the second frame.

According to the present invention, it is possible to minimize the disturbance elements that can occur in the penetration equipment for the test in the micro deformation, it is possible to miniaturize the test equipment by using a control box, to prevent soil plugging phenomenon, to improve the disturbing effect This can be minimized to facilitate the depth test.

Description

Apparatus for measuring elastic wave with blade type and system

1 illustrates a soil plugging phenomenon occurring in a conventional acoustic wave measuring apparatus.

2 is a top vertical view and a bottom vertical view of a conventional acoustic wave measuring device.

3 is a perspective view of a blade type acoustic wave measuring device according to an embodiment of the present invention.

4 is a top vertical view and a bottom vertical view of the acoustic wave measuring apparatus of FIG. 3.

5A is a front view of the acoustic wave measuring apparatus of FIG. 3.

5B is a side view of the acoustic wave measuring apparatus of FIG. 3.

FIG. 6 is an internal block diagram of the acoustic wave measuring apparatus of FIG. 3.

FIG. 7 illustrates an operation of the acoustic wave measuring apparatus of FIG. 3.

8 is a perspective view of a blade type acoustic wave measuring apparatus according to another embodiment of the present invention.

9 is a structural diagram of a blade type acoustic wave measuring system according to another embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to measuring acoustic waves, and more particularly, to a blade type acoustic wave measuring apparatus and a system thereof.

Geotechnical investigation is an essential technology for the design and construction of ground structures, and ultimately aims to provide the ground information necessary for the design and analysis of the ground and ground structures based thereon.

In recent years, more design criteria are required for design and construction than simply for stability, depending on the use and characteristics of the structure. In particular, since plant structures for high-tech industries are also affected by the micro deformation of the foundation soil, the ground survey also needs to provide design elements with clarity and reliability according to the micro deformation.

As it is essential to secure the stability of the structure against earthquakes all over the world, it is necessary to secure microscopic ground survey methods for seismic design. Existing physical exploration tests conducted for the ground investigation of such micro deformations can be conducted under the ground conditions limited by environmental factors or test methods, so the ground investigation methods for micro deformations have yet to be developed. To overcome this problem, intrusive seismic test equipment has been developed that can be tested in depth without being affected by soil conditions.

1 illustrates a soil plugging phenomenon occurring in a conventional acoustic wave measuring apparatus.

As shown in Figure 1, when the hard ground is infiltrated into soft ground, the surrounding ground does not pass the test equipment, and the ground and the test equipment is in a state in which it is intruded and cannot be tested. This phenomenon is called oil plugging.

In addition, the currently developed penetrating seismic test equipment has a large contact area between the surrounding ground and the test equipment, thereby increasing the disturbance effect due to friction or area. The characteristics regarding the contact area can be seen through the upper perpendicularity and the lower perpendicularity of the conventional acoustic wave measuring apparatus of FIG. 2.

Therefore, the conventional penetration type acoustic wave measuring device has a problem that it is not possible to prevent the sowing plugging phenomenon, the disturbance effect can not be minimized, so that the depth test is not easy.

The first technical problem to be achieved by the present invention is to minimize the disturbances that can occur in the penetration equipment for testing in the micro deformation, it is possible to miniaturize the test equipment using a control box, to prevent the plugging phenomenon In addition, the present invention provides a blade type acoustic wave measuring device that can easily disturb the depth test because the disturbing effect can be minimized.

The second technical problem to be achieved by the present invention is to minimize the disturbances that can occur in the penetration equipment for testing in the micro deformation, it is possible to miniaturize the test equipment using a control box, to prevent the plugging phenomenon In addition, the disturbance effect can be minimized to facilitate the large-depth test, and a large amount of transducers for measuring seismic waves are installed to estimate the anisotropy necessary for the stress characteristics, and the behavior characteristics according to the micro-deformation of the same depth can be obtained. An object of the present invention is to provide a blade type acoustic wave measuring apparatus capable of measuring elastic wave velocity.

The third technical problem to be achieved by the present invention is to provide a blade type acoustic wave measuring system capable of performing the acoustic wave measurement test, including the blade-type acoustic wave measuring device.

In order to achieve the first technical problem, the present invention provides a penetration rod including a control cable for transmitting a control signal of the ground control device, a signal generator for generating a predetermined input wave, and a control signal received through the control cable. According to the spatula shape including a control unit for starting or ending the generation of the input wave of the signal generation unit, the penetration rod, the signal generation unit and the control unit, and the penetration blade disposed in the direction in which the penetration rod is penetrated. One frame is connected in a direction in which the penetration rod is penetrated, and a pair of second frames connected to the side of the penetration blade and arranged in parallel with each other, and are disposed to face each other at regular intervals through the second frame, A plurality of transducers for propagating the input wave to the ground and receiving the elastic wave passing through the ground; In order to maintain the parallel spacing of the frames it provides a blade-type acoustic wave measuring apparatus comprises a third frame in the form penetration edge connecting the two ends of the second frame.

In order to achieve the second technical problem, the present invention provides a penetration rod including a control cable for transmitting a control signal of the ground control device, a signal generator for generating a predetermined input wave, and a control signal received through the control cable. According to the spatula shape including a control unit for starting or ending the generation of the input wave of the signal generation unit, the penetration rod, the signal generation unit and the control unit, and the penetration blade disposed in the direction in which the penetration rod is penetrated. One frame is connected in a direction in which the penetration rod is penetrated, a pair of second frames connected to the side of the penetration blade and arranged in parallel with each other, and are disposed in a form facing each other at regular intervals through the second frame, To measure the anisotropy of the ground, the vibrations of the transducers are arranged differently so that the input wave A plurality of anisotropic transducers for propagating and receiving elastic waves passing through the ground, a third frame in the form of a penetration blade connecting both ends of the second frame to maintain parallel spacing of the second frame, and the plurality of transducers Provides a blade type acoustic wave measuring apparatus including an output cable for converting the received acoustic wave into an electrical signal and outputting the electrical signal to the ground control device.

In order to achieve the third technical problem, the present invention is a seismic measurement system comprising a ground control device and a penetrating seismic measuring device, the ground control device is input by a signal generator and a user for generating a predetermined input wave And a control unit for starting or terminating the generation of the input wave in accordance with the control signal, wherein the penetration type acoustic wave measuring device includes a penetration rod including a cable for transmitting the input wave, and fixing the penetration rod. A first frame in the form of a spatula including a penetration blade disposed in a direction in which the penetration rod is penetrated, a pair of second frames connected in a direction in which the penetration rod is penetrated and connected in parallel with each other to the side of the penetration blade; It is arranged in a form facing each other at regular intervals through the second frame, the ground to the input wave A blade type elastic wave comprising a plurality of transducers propagating through the ground and receiving elastic waves passing through the ground, and a third frame in the form of a penetration blade connecting both ends of the second frame to maintain parallel spacing of the second frame. Provide a measurement system.

The seismic detection method is an exploration method that measures the propagation speed of an acoustic wave due to the difference in elasticity of rocks and minerals and analyzes it.

Refraction method The seismic detection method is applied when critical refraction occurs in the propagation process of seismic waves. Waves incident at critical angles on the lower layer having high velocity are refracted parallel to the boundary of the layer and propagated at the velocity of the lower layer. Uses include the existence of shadowed zones and the discovery of discontinuities, the exploration of rock salt domes, which are oil-rich areas, the basic survey for the installation of large structures such as dam roads, preliminary geological surveys in undeveloped areas, and groundwater and mineral exploration.

Reflective seismic surveys are used for underground sedimentary investigations and are widely used for offshore oil exploration. The side length of the reflex method is enough to be a fraction of the depth of irradiation, and it is superior to the refraction method for exploring complex multilayer structures in detail. Depths of investigation range from hundreds to thousands of meters, and exploration of the microscopic structure of the earth's crust does not matter, even if several discontinuities exist.

When an external force is applied to an object, the object is deformed. When the external force is removed, the property of returning to the original state is called elasticity of the material. Elasticity is used to obtain underground information because of the difference in transmission speed depending on the object (type of rock). Since the force acting on a unit area is called stress, Hook's law that elastic strain reflects stress is called elastic material.

When an object is impacted, its wavelength is transmitted to the object, which is called a seismic wave. Acoustic waves are classified into longitudinal waves, shear waves, and surface waves. The longitudinal wave is called the fastest P wave (prinary wave) among the seismic waves, and the propagation speed is shown in Equation 1 below.

Where R is the volume elastic flow, ρ is the density, and μ is the stiffness.

Shear waves are called S wave (secondary wave) and the propagation speed is given by the elastic modulus of the medium. The propagation speed of the S wave is shown in Equation 2 below.

Surface waves propagate with energy concentrated on a surface or interface and are divided into Rayleigh waves and love waves. The velocity of seismic wave propagation in rock depends on the quality of the rock.

Seismic waves are refracted when they reach the interface between layers with different propagation velocities and densities, which represent qualitative differences in rock.

The reflection method is suitable for shallow exploration, and the difficulty of discontinuity analysis is large.

Seismic waves can be calculated by measuring the time it takes for P to reach a wave oscillator, or transducer, installed in the ground or on the ground, and using the relationship between the distance from the point of occurrence and the time of arrival. The seismic segregation is clear at 3.5-5.5 km / sec in granite, while the seismic velocity in clay and sand is 0.5-1.5 km / sec.

The present invention aims to accurately grasp the ground characteristics through minimizing the contact area with the ground of the acoustic wave measuring device, intruding to the minimum, and the ground behavior of the micro deformation of the large depth field ground.

Hereinafter, with reference to the drawings will be described a preferred embodiment of the present invention. However, embodiments of the present invention illustrated below may be modified in many different forms, and the scope of the present invention is not limited to the embodiments described below.

3 is a perspective view of a blade type acoustic wave measuring device according to an embodiment of the present invention.

Penetration rod 310 includes a control cable for transmitting a control signal of the ground control device. Preferably, the penetration bar 310 may be made of a material that is durable to the pressure at the time of penetration. Preferably, the penetration bar may be connected to a control device installed on the ground or in the water.

The first frame 320 is fixed by connecting the penetration bar, it is made of a spatula-shaped frame including a penetration blade disposed in the direction in which the penetration bar is inserted.

Preferably, the first frame 320 starts or ends the input wave generation of the signal generator 622 according to the signal generator 622 for generating a predetermined input wave and the control signal received through the control cable. The controller 621 may be built in.

Preferably, the control unit 621 for controlling the signal generator 622 for generating a predetermined input wave and the control unit 621 for starting or ending the generation of the input wave of the signal generator 622 according to the control signal received through the control cable. Embedded in the device, the blade type acoustic wave measuring device according to an embodiment of the present invention may be configured to include only a control cable, a transducer and an output cable.

Preferably, the first frame 320 may be included as a control box that can perform the seismic measurement and the electrical resistivity test therein. In this case, the control box includes a signal generator 622 for generating a predetermined input wave and a controller 621 for starting or ending the generation of the input wave of the signal generator 622 according to a control signal received through the control cable. can do.

The second frame 330 is a pair of frames which are connected in a direction in which the penetration bar is penetrated and connected in parallel with each other to be connected to the side of the penetration blade. The second frame 330 may be more easily formed by forming an end portion of the side that meets the third frame 360 into an awl shape.

The plurality of transducers 341-347 are disposed to face each other at regular intervals through the second frame 330, to propagate an input wave, that is, an elastic wave, to receive ground waves passing through the ground. Although three transducers are arranged in one frame in FIG. 3, the number of transducers may be adjusted and arranged according to a selection by those skilled in the art.

Preferably, the plurality of transducers 341-347 may have a structure in which steel sheets are stacked between a pair of piezoelectric waves. In this case, the plurality of transducers 341-347 may be elements that propagate an input wave having a wavelength corresponding to a voltage difference between the pair of piezoelectric plates when different electrodes are applied to the pair of piezoelectric plates.

The third frame 360 is a penetrating blade-shaped frame connecting both ends of the second frame 330 to maintain parallel spacing of the second frame 330. Preferably, the third frame 360 may be more easily inserted by providing a penetration blade in the penetration direction.

Preferably, when the transducers facing the transducers 341-347 of the blade type acoustic wave measuring apparatus according to the embodiment of the present invention convert the received acoustic waves into electrical signals and output the electrical signals, the ground signals are ground. It may further include an output cable (not shown) for transmitting to the control device. Preferably, the output cable (not shown) may be embedded in the second frame 330, the first frame 320, and the penetration bar 310.

Operation principle of the blade-type acoustic wave measuring apparatus according to an embodiment of the present invention is as follows. First, penetrate the penetration rod to the required depth using the penetration apparatus on the ground or in the water. Next, select a transducer for measuring seismic waves at both ends in the control box and input an input wave such as an impulse, sinusoidal wave, or square wave in the test equipment. Command to send Next, a signal transmitted / received by the transducers at both ends of the second frame 330 is transmitted through an output cable connected to the ground or the water, and the control device of the ground or the water receives the arrival time and speed of the acoustic wave from this signal. Measure

4 is a top vertical view and a bottom vertical view of the acoustic wave measuring apparatus of FIG. 3.

As shown in Figure 4, the blade type acoustic wave measuring apparatus according to an embodiment of the present invention can be seen that the entire device is a penetration type, the contact area with the ground is minimized.

5A is a front view of the acoustic wave measuring apparatus of FIG. 3.

The penetration bar 510 includes a control cable for transmitting a control signal of the ground control device.

The first frame 520 is fixed by connecting the penetration bar, it is made of a spatula-shaped frame including a penetration blade disposed in the direction in which the penetration bar is inserted.

Preferably, the first frame 520 may start or stop the generation of the input wave of the signal generator 622 according to the signal generator 622 for generating a predetermined input wave and the control signal received through the control cable. The controller 621 may be built in.

Preferably, the control unit 621 for controlling the signal generator 622 for generating a predetermined input wave and the control unit 621 for starting or ending the generation of the input wave of the signal generator 622 according to the control signal received through the control cable. Embedded in the device, the blade type acoustic wave measuring device according to an embodiment of the present invention may be configured to include only a control cable, a transducer and an output cable.

The second frame 530 is a pair of frames connected in a direction in which the penetration bar is penetrated and connected in parallel with each other to be connected to the side of the penetration blade.

The plurality of transducers 541-557 are disposed in a form facing each other at a predetermined interval through the second frame 530, and propagate the input wave, that is, the elastic wave to the ground, and receives the elastic wave passing through the ground. In FIG. 5A, seven transducers are arranged per frame, but the number of transducers may be adjusted and arranged according to a selection by those skilled in the art.

In FIG. 5A, when the transducers 541-547 on the left side are selected as transducers for propagating an input wave, that is, an elastic wave, the transducers 551-557 on the right side become a transducer for receiving the elastic wave. On the contrary, when the transducers 551-557 on the right side are selected as transducers for propagating input waves, that is, elastic waves, the transducers 541-547 on the left side become transducers for receiving the elastic waves.

The third frame 560 is a frame in the form of penetration blades connecting both ends of the second frame 530 to maintain parallel spacing of the second frame 530. Preferably, the third frame 560 can be more easily provided by the penetration blade in the penetration direction.

5B is a side view of the acoustic wave measuring apparatus of FIG. 3.

The penetration bar 510 includes a control cable for transmitting a control signal of the ground control device.

The first frame 520 is fixed by connecting the penetration bar, it is made of a spatula-shaped frame including a penetration blade disposed in the direction in which the penetration bar is inserted.

The second frame 530 is a pair of frames connected in a direction in which the penetration bar is penetrated and connected in parallel with each other to be connected to the side of the penetration blade.

The plurality of transducers 541-547 of FIG. 5B are transducers disposed on the left side in FIG. 5A.

The third frame 560 is a frame in the form of penetration blades connecting both ends of the second frame 530 to maintain parallel spacing of the second frame 530. Preferably, the third frame 560 can be more easily provided by the penetration blade in the penetration direction.

FIG. 6 is an internal block diagram of the acoustic wave measuring apparatus of FIG. 3.

The controller 621 starts or stops generating the input wave of the signal generator 622 according to the control signal received through the control cable. The control signal is a signal input by a control device located on the ground or in the water, and is a signal corresponding to a user's operation. The control signal includes a command for generating or terminating an input wave and a command for selecting a type of the input wave.

The signal generator 622 generates a predetermined input wave according to the operation of the controller 621. Preferably, the signal generator 622 may generate an input wave of any one of a sine wave, a square wave, and an impulse according to the control signal.

The plurality of transducers 641-649 for propagating the input wave propagate the input wave by the signal generator 622 to the ground.

The plurality of transducers 651 to 659 for receiving the elastic waves receive the input waves, that is, the elastic waves, which have passed through the ground, and transmit them to the ground or the water through the output cable.

FIG. 7 illustrates an operation of the acoustic wave measuring apparatus of FIG. 3.

7 conceptually illustrates the above-described operations. That is, in the first frame, the signal generator and the control unit are positioned to generate an input wave according to the control signal. In the second frame, the acoustic wave is transmitted / received. In the first frame and the penetration rod, the received acoustic wave signal is ground or Send to the water.

8 is a perspective view of a blade type acoustic wave measuring apparatus according to another embodiment of the present invention.

Blade type acoustic wave measuring apparatus according to another embodiment of the present invention, as shown in Figure 8, may be configured to measure the elastic wave by varying the direction of the transducer mounted for each transducer and to estimate the anisotropic characteristics of the field from it. That is, the measured values are combined to measure the seismic waves on the same depth and to estimate the anisotropy.

That is, as shown in FIG. 8, the plurality of anisotropic transducers are disposed to face each other at regular intervals through the second frame, and the vibration directions of the transducers are different from each other to measure the anisotropy of the ground. Propagates through the air, and receives the acoustic wave passing through the ground.

9 is a structural diagram of a blade type acoustic wave measuring system according to another embodiment of the present invention.

The blade type acoustic wave measuring system according to another exemplary embodiment of the present invention includes a ground control device 970 and a penetration type acoustic wave measuring device 900.

The penetration type acoustic wave measuring device 900, as described above, the first frame in the form of a spatula including a penetration rod including a cable for transmitting an input wave, a penetration rod fixed in the penetration rod and a penetration blade disposed in a direction in which the penetration rod is inserted. , A pair of second frames, which are connected in a direction in which the penetration rod is penetrated and connected to the side of the penetration blade, are arranged in parallel with each other at regular intervals through the second frame to propagate the input wave to the ground. A plurality of transducers for receiving the elastic waves passing through the ground and a third frame in the form of penetration blades connecting both ends of the second frame to maintain parallel spacing of the second frame.

9 is a diagram in which the control unit 971 and the signal generator 972 are not built in the penetrating acoustic wave measuring apparatus 900.

Preferably, the penetrating acoustic wave measuring apparatus 900 further includes an output cable for transmitting the electrical signal to the ground control device 970 when the plurality of transducers convert the received acoustic wave into an electrical signal and output the electrical signal. Can be.

In this case, the output cable may be embedded in the second frame, the first frame and the penetration bar.

The ground control device 970 includes a controller 971 and a signal generator 972.

The controller 971 starts or stops generating the input wave of the signal generator 972 according to a control signal input by the user.

Preferably, the controller 971 may select a transducer for propagating an input wave among a plurality of transducers and generate a control signal for generating an input wave of any one of a sine wave, a square wave, and an impulse.

The signal generator 972 generates a predetermined input wave. Preferably, the signal generator 972 may generate an input wave of any one of a sine wave, a square wave, and an impulse according to the control signal.

Preferably, the ground control device 970 may include a bandpass filter 973 that removes noise from the acoustic waves received by the plurality of transducers.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary and will be understood by those of ordinary skill in the art that various modifications and variations can be made therefrom. However, such modifications should be considered to be within the technical protection scope of the present invention. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

As described above, according to the present invention, by designing a penetration type acoustic wave measuring device in the blade type, to minimize the disturbances that can occur in the penetration equipment for the test in the micro deformation, the test using a control box (Control Box) The equipment can be miniaturized, and the built-in control system (Auto control system) simplifies the test method, prevents the plugging of the soil, and minimizes the disturbing effect, so that it is easy to test the large depth and to measure a large amount of seismic waves. It is possible to estimate the anisotropy required for the stress characteristics by mounting the transducer, and to measure the anisotropy and seismic velocity of the behavior characteristics due to the micro deformation of the same depth.

Claims (11)

A penetration rod including a control cable for transmitting a control signal of the ground control device; A signal generator for generating a predetermined input wave; A controller for starting or terminating generation of an input wave of the signal generator according to a control signal received through the control cable; A spatula-shaped first frame connecting and fixing the penetration bar, the signal generator and the control unit, and a penetration blade disposed in a direction in which the penetration bar is inserted; A pair of second frames connected in a direction in which the penetration bar is penetrated and connected in parallel with each other to the side of the penetration blade; A plurality of transducers arranged to face each other at regular intervals through the second frame to propagate the input wave to the ground and to receive the elastic waves passing through the ground; And Blade type acoustic wave measuring device comprising a third frame in the form of a penetration blade connecting both ends of the second frame to maintain parallel spacing of the second frame. The method of claim 1, The plurality of transducers A structure in which a steel sheet is laminated between a pair of piezoelectric waves, and when different electrodes are applied to the pair of piezoelectric plates, the device propagates an input wave having a wavelength corresponding to the voltage difference between the pair of piezoelectric plates. Blade type acoustic wave measuring device. The method of claim 1, And converting the received acoustic waves into electrical signals to output the electrical signals, and outputting the electrical signals to the ground control device. The method of claim 3, wherein And the output cable is embedded in the second frame, the first frame, and the penetration rod. The method of claim 1, The second frame Blade type acoustic wave measuring device, characterized in that the distal end portion is formed in an awl shape in the penetration direction. The method of claim 1, The signal generator Blade type acoustic wave measuring device, characterized in that for generating an input wave of any one of a sine wave, a square wave or an impulse in accordance with the control signal. A penetration rod including a control cable for transmitting a control signal of the ground control device; A signal generator for generating a predetermined input wave; A controller for starting or terminating generation of an input wave of the signal generator according to a control signal received through the control cable; A spatula-shaped first frame connecting and fixing the penetration bar, the signal generator and the control unit, and a penetration blade disposed in a direction in which the penetration bar is inserted; A pair of second frames connected in a direction in which the penetration bar is penetrated and connected in parallel with each other to the side of the penetration blade; Arranged to face each other at regular intervals through the second frame, the vibration direction of the transducers are arranged differently for measuring the anisotropy of the ground to propagate the input wave to the ground, and receives the acoustic wave passing through the ground A plurality of anisotropic transducers; A third frame in the form of a penetration blade connecting both ends of the second frame to maintain parallel spacing of the second frame; And Blade type acoustic wave measuring device comprising an output cable for transmitting the electrical signal to the ground control device when the plurality of transducers converts the received acoustic wave into an electrical signal and outputs. A seismic measurement system comprising a ground control device and a penetrating seismic measurement device, The ground control device A signal generator for generating a predetermined input wave; And A control unit for starting or terminating generation of an input wave of the signal generator according to a control signal input by a user, The penetration type acoustic wave measuring device A penetration rod including a cable for transmitting the input wave; A first frame having a spatula shape to fix the penetration rod and include a penetration blade disposed in a direction in which the penetration rod is introduced; A pair of second frames connected in a direction in which the penetration bar is penetrated and connected in parallel with each other to the side of the penetration blade; A plurality of transducers arranged to face each other at regular intervals through the second frame to propagate the input wave to the ground and to receive the elastic waves passing through the ground; And Blade type acoustic wave measuring system comprising a third frame in the form of a penetration blade connecting both ends of the second frame to maintain parallel spacing of the second frame. The method of claim 8, The ground control device And a band pass filter for removing noise from the acoustic waves received by the plurality of transducers. The method of claim 8, And converting the received acoustic waves into electrical signals to output the electrical signals, and outputting the electrical signals to the ground control device. The method of claim 8, The control unit Selecting a transducer for propagating an input wave among the plurality of transducers, generating a control signal for generating any one of a sinusoidal wave, a square wave, or an impulse; The signal generator Blade type acoustic wave measuring system, characterized in that for generating an input wave of any one of a sine wave, a square wave or an impulse in accordance with the control signal.

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