KR100662082B1 - A method for radiation beam angle transform of ultrasonic waveguide sensor and an apparatus thereof - Google Patents

Abstract

The present invention relates to a waveguide ultrasonic sensor device and method using a beam radiation angle conversion by frequency modulation, and more particularly to a waveguide ultrasonic sensor device for detecting the internal shape with a high temperature liquid metal using sodium as a coolant. By continuously modulating the frequency of the ultrasonic signal incident on the inside of the sodium through the waveguide to change the radiation angle of the ultrasonic beam, the waveguide ultrasonic wave can detect the internal shape with the liquid metal only by the frequency conversion without mechanical driving A beam radiation angle conversion device and method of a sensor.

The waveguide ultrasonic sensor device according to the present invention includes a synthesizer pulse generator for generating one or more ultrasonic signals whose frequency is continuously modulated in a predetermined band, and converging the one or more ultrasonic signals from the synthesizer pulse generator to the predetermined device by using the ultrasonic wave. An ultrasonic sensor that transmits a signal and receives the ultrasonic signal reflected from the device, and is connected to the ultrasonic sensor to transmit and receive the one or more ultrasonic signals to generate the one or more ultrasonic signals as one or more plate waves having different phase speeds. An ultrasonic wedge, coupled to the ultrasonic wedge, for emitting the one or more plate waves from the ultrasonic wedge to a predetermined specimen at each radial angle, and receiving one or more reflected signals reflected from the specimen Wave guide, and is provided spaced apart by the wave guide and the predetermined distance, it consists of a protective tube to be installed in the shape surrounding the outside of the wave guide.

According to the waveguide ultrasonic sensor device and method of the present invention, by converting the radiation angle of the ultrasonic beam by continuously modulating the frequency of the ultrasonic signal in a predetermined band, to detect the internal shape with a liquid metal without mechanical driving of the waveguide ultrasonic sensor device The effect can be obtained.

Ultrasonic shape detection, liquid metal, frequency, waveguide, plate wave, sodium internalization

Description

Method and apparatus for beam radiation angle conversion of waveguide ultrasonic sensor {A METHOD FOR RADIATION BEAM ANGLE TRANSFORM OF ULTRASONIC WAVEGUIDE SENSOR AND AN APPARATUS THEREOF}

1 is a block diagram showing the configuration of a waveguide ultrasonic sensor device according to the prior art.

Figure 2 is a block diagram showing the configuration of a waveguide ultrasonic sensor device using the ultrasonic beam radiation angle conversion according to the frequency modulation of the present invention.

Figure 3 is a view showing the configuration of the ultrasonic wedge of the waveguide ultrasonic sensor device according to the present invention.

Figure 4a is a graph showing the phase velocity dispersion characteristics of the plate wave according to the product of the wave guide thickness and the wave guide wave propagated in the wave guide.

Figure 4b is a graph showing the group velocity dispersion characteristics of the plate wave according to the product of the wave guide thickness and the frequency of the wave wave propagated in the wave guide.

Figure 5 is a graph showing the change in amplitude according to the frequency of the ultrasonic signal propagated in the waveguide ultrasonic sensor of the present invention reflected by the underwater test body and returned.

6 is a flow chart showing the sequence of the waveguide ultrasonic detection method according to an embodiment of the present invention.

7 is an internal block diagram of a general purpose computer system that may be employed to construct a waveguide ultrasonic sensor device in accordance with the present invention.

<Explanation of symbols for the main parts of the drawings>

210: synthesizer pulse generator 220: ultrasonic sensor

230: ultrasonic wedge 240: wave guide

250: protective tube 260: ultrasonic radiation beam

270 test body 280 liquid metal

290: shape detection device

The present invention relates to a waveguide ultrasonic sensor device and method using a beam radiation angle conversion by frequency modulation, and more particularly to a waveguide ultrasonic sensor device for detecting the internal shape with a high temperature liquid metal using sodium as a coolant. By continuously modulating the frequency of the ultrasonic signal incident on the inside of the sodium through the waveguide to convert the radiation angle of the ultrasonic beam, it is possible to detect the shape and deformation of the internal structure with liquid metal only by the modulation of the frequency without mechanical driving. The present invention relates to an apparatus and method for converting a beam radiation angle of a waveguide ultrasonic sensor.

As a liquid metal using sodium as a coolant, there is a technical problem to be overcome, unlike a conventional light water reactor using water as a coolant. Since sodium solidifies below 98 ℃, the sodium in the vessel and piping should always be maintained at around 200 ℃ even during shutdown. In addition, because sodium coolant is opaque, optical inspection is impossible. Ultrasonic waves, which generate mechanical waves, allow you to see objects inside opaque sodium. Ultrasonic technology in sodium is generally the pulse echo method used in the industrial ultrasound. In the pulse-echo method, the time difference between the pulse and the echo and the magnitude of the echo signal can be measured to obtain the reflector information on the distance and the magnitude to the reflector. The shape of the reflector can be imaged on the computer using the echo arrival time difference and the signal magnitude along with the sensor position information obtained during the scanning process.

Developing Liquid Metals Developed countries have developed technologies to overcome the opacity of sodium from the very beginning of developing liquid metals to develop basic technology, visualization devices and sensors for under-sodium viewing (USV), and to observe the core. Research and development has been carried out for application to internal sodium and in-situ testing. The inspection technology that visualizes the inside of sodium using ultrasonic waves detects core deformation by high-speed neutrons, in-service inspection of furnace structures and devices with liquid metal, locates fuel assemblies during fuel replacement, and whether there are any obstacles in the fuel transport path. Enable detection, etc.

As a method of sodium internalization, a method of directly immersing an ultrasonic sensor in high temperature sodium and a method of installing an ultrasonic sensor outside of a reactor vessel head and transmitting and receiving ultrasonic waves remotely using a waveguide were applied.

The waveguide sensor and the sodium immersion sensor are each a remote ranging scan method that scans ultrasonic waves horizontally from the top of the core for obstacle detection at the top of the core, and a proximity scan method that visualizes the core by scanning ultrasound directly from the top of the core. Applied. France developed the horizontal Ranging scan method of the rod-shaped waveguide sensor and applied it successfully to Phenix. In the UK, the waveguide sensor using thin and long plate was developed and tested in the laboratory. It did not actually apply.

In Japan, in order to overcome the driving limitation of the waveguide sensor, a sensor that is directly immersed in sodium was developed and applied to monitor the presence of obstacles on the upper core by a horizontal ranging scan method. Several countries, such as the United Kingdom, the United States, Germany, and India, have developed a close-scan method using liquid immersion sensors in order to test images for liquid metal furnaces.

Each country has made many improvements by concentrating research on the development of immersion high temperature ultrasonic sensor, but it has a problem that the lifespan at high temperature is not so long and transmission and reception sensitivity is easily deteriorated. In addition, the need for intensive R & D on the approach and scanning method and the development of high-precision image processing to the target to be visualized has emerged, and has been proposed as the main core R & D task for commercialization with liquid metal.

Sodium internal visualization technology to liquid metal is required to successfully develop an ultrasonic sensor that can be used for a long time with stable performance at high temperature of more than 200 ℃ of radioactive. Ultrasonic sensors for internal sodium visualization have been developed in two directions. The first method is to use a liquid immersion type high temperature ultrasonic sensor that is directly immersed in sodium using PZT (Lead Zirconate Titanate) or Lithium Niobate, which is a high-temperature piezoelectric element. Ultrasonic sensors are installed on the outside and ultrasonic waves are remotely propagated inside sodium using waveguides such as solid rods and plates.

The method of direct immersion in sodium can obtain high resolution ultrasound image, but it is difficult to use for a long time due to the shortened life of the sensor due to high temperature environment, and the waveguide sensor method does not contact the high temperature environment for a long time. There is an advantage in using the sensor, but there are limitations in the ultrasound beam scanning angle conversion and scanning.

1 is a block diagram showing the configuration of a waveguide ultrasonic sensor device according to the prior art.

As shown in FIG. 1, the waveguide ultrasonic sensor device according to the related art receives an ultrasonic signal from an ultrasonic sensor 110 and an ultrasonic sensor 110 for detecting and transmitting an ultrasonic signal, and converts the ultrasonic signal into a liquid metal ( 130) using a wave guide 120, sodium propagating to the test body 140, sodium as a coolant, a liquid metal furnace 130 containing a predetermined test body, and generates an ultrasonic signal to transmit to the ultrasonic sensor 110 The pulse generator 150 and the scanner controller 160 for controlling the scanning of the waveguide 120, and by measuring the ultrasonic signal reflected from the test body 140, to detect the shape inside the liquid metal furnace 130 It further comprises a predetermined computer, an A / D board, an oscilloscope to perform an operation.

The prior art waveguide ultrasonic sensor device requires a mechanical drive of the waveguide 120 to detect the shape of the liquid metal furnace 130, that is, the shape of the test body 140. The ultrasonic wave signal propagated into the liquid metal furnace 130 through the wave guide 120 propagates with a radiation angle within a predetermined range, so that the waveguide 120 detects the shape of the entire inside of the liquid metal furnace 130. The entire shape of the inside of the liquid metal furnace 130 may be detected only by performing mechanical operations such as changing the direction of the direction or changing the position of the waveguide 120. However, the mechanical operation of the wave guide 130 as described above, that is, the scanning operation, considering all the specifications and operating conditions of the wave guide 120 and the liquid metal furnace 130, all of the inside of the liquid metal furnace 130 There is a fundamental difficulty in performing the scanning operation to detect the shape, which is practically limited.

As the above disadvantages are raised, the waveguide ultrasonic sensor device propagates an ultrasonic signal to the inside of the liquid metal without mechanical driving, and thus the waveguide can detect the shape and deformation of the inside with the liquid metal. There is an urgent need for the development of an ultrasonic sensor device.

The present invention has been made to improve the prior art as described above, by converting the radiation angle of the ultrasonic beam by continuously modulating the frequency of the ultrasonic signal in a predetermined band, the inside of the liquid metal without mechanical drive of the waveguide ultrasonic sensor device An object of the present invention is to provide a waveguide ultrasonic sensor device and method capable of detecting a shape.

In addition, the present invention implements the electronic scanning of the waveguide ultrasonic sensor according to the frequency modulation, overcoming the limitation of the scanning range of the waveguide ultrasonic sensor due to the mechanical drive wave to detect the internal shape of the liquid metal in more detail An object of the present invention is to provide a guide ultrasonic sensor device and method.

In addition, the present invention is to install the wave guide from the penetrating portion of the upper part of the reactor to the high temperature liquid metal inside the sodium, and to install the ultrasonic sensor on the upper part of the reactor to oscillate the ultrasonic wave without any problem in high temperature or high radioactivity to form the internal shape of the liquid metal It is an object of the present invention to provide a waveguide ultrasonic sensor device and method that can detect more safely and efficiently.

In addition, an object of the present invention is to provide a waveguide ultrasonic sensor device and method that can implement a phased array ultrasonic oscillation method for driving a plurality of sensors by an electronic method in a single waveguide ultrasonic sensor, low cost, high efficiency do.

In order to achieve the above object and to solve the problems of the prior art, the waveguide ultrasonic sensor device according to the present invention, the synthesizer pulse generator for generating one or more ultrasonic signals that frequency is continuously modulated in a predetermined band, from the synthesizer pulse generator An ultrasonic sensor for converging the one or more ultrasonic signals to transmit the ultrasonic signal to a predetermined device, and receiving the ultrasonic signal reflected from the device, and connected with the ultrasonic sensor to receive the one or more ultrasonic signals Ultrasonic wedges for generating the above ultrasonic signals into one or more plate waves having different phase velocities, respectively, connected to the ultrasonic wedges, and receiving the one or more plate waves from the ultrasonic wedges to generate the one or more plate waves with a predetermined test object, respectively. A wave guide for emitting at least one reflected signal reflected from the test object, and a waveguide installed at a predetermined distance from the wave guide and surrounding the outside of the wave guide, The apparatus may further include a shape detecting device configured to receive the reflected signal from the waveguide and detect a shape of the test object.

Types of sound waves mainly used in ultrasonic flaw detection include longitudinal waves, transverse waves, surface waves, and plate waves. In this specification, a configuration for detecting an internal shape of a liquid metal using a plate wave is disclosed. Fan wave is another form of ultrasonic wave used for non-destructive testing of metals. The plate wave theory is described by Horace® Lamb and is also referred to as Lamb wave. The plate wave travels inside a thin plate, ie, a plate having a thickness within only three wavelengths. And it consists of a complex vibration form that proceeds through the entire thickness of the material.

The characteristics of the plate vibration mode are affected by the density of the material, the elastic properties of the metal and its structure, thickness and frequency. The wave is divided into symmetrical and antisymmetrical modes according to the way it proceeds, and this pattern is further subdivided by velocity, which is controlled by the angle at which the wave enters the specimen. Theoretically, there can be infinite speeds of plate waves that can travel within a given material. Basically, the speed of a plate wave in a given material is determined by the plate thickness and frequency. The symmetry mode in a plate is called an extensional mode because its displacements are symmetrical with respect to the central axis of the plate thickness, and the average displacement of particles with respect to the plate thickness is mainly in the x- axis direction. On the other hand, the antisymmetric mode is also called transverse mode or flexural mode because the displacements are antisymmetrical with respect to the central axis of the plate thickness and the average displacement of the particles is in the z- axis direction.

Ultrasonic examination is a method that uses the characteristics of ultrasonic waves to transmit, refract or reflect at the interface such as discontinuities when proceeding in a test body. Pulse-echo analysis is a method of analyzing and analyzing ultrasonic waves reflected from discontinuous parts. Or Pulse-reflection, Through Transmission, which is a method of analyzing and inspecting transmitted ultrasonic waves, and Resonance, which is similar to the Pulse Echo method, but using a resonance phenomenon. In the present specification, the ultrasonic pulse is regularly incident on the test object and the internal shape of the liquid metal is detected by using the pulse echo method, which is a method of obtaining the necessary information such as the size and position of the reflection source by analyzing the ultrasonic wave reflected from the reflection source. An example of the configuration will be described.

Ultrasonic flaw detection is classified into A-scan, B-scan, and C-scan according to a display method of displaying information about reflected waves on a monitor screen or other recording device. An example of a configuration for detecting the internal shape of a liquid metal by the B-scan method, which shows the thickness of the specimen and the depth and length of the discontinuity, which is very convenient for checking the distribution of defects, is disclosed.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

Figure 2 is a block diagram showing the configuration of a waveguide ultrasonic sensor device using the ultrasonic beam radiation angle conversion according to the frequency modulation of the present invention.

As shown in FIG. 2, the waveguide ultrasonic sensor device according to the present invention includes a synthesizer pulse generator 210 and a synthesizer pulse generator 210 generating one or more ultrasonic signals whose frequencies are continuously converted in a predetermined band. It is connected to the ultrasonic sensor 220 and the ultrasonic sensor 220 to converge the signal and transmit the ultrasonic signal to a predetermined device, and receive the ultrasonic signal reflected from the device, the phase velocity of each of the one or more ultrasonic signals An ultrasonic wedge 230 and an ultrasonic wedge 230 for generating another one or more wave waves are connected, and the one or more plate waves are received from the ultrasonic wedge 230 to respectively generate the one or more plate waves with a predetermined test body 270. A wave that emits at a radial angle of and receives one or more reflected signals reflected from the test object 270 The guard 240 is installed to be spaced apart from the guide 240, the wave guide 240 by a predetermined distance, and installed in a form surrounding the outside of the wave guide 240, and the reflected signal from the wave guide 240 A shape detecting device 290 that receives and detects the shape of the test body 270, is filled with a predetermined liquid metal (herein using sodium), and includes one or more test bodies 270 therein. The liquid metal furnace 280 may be further included.

Synthesizer pulse generator 210 is composed of a synthesizer (Synthesizer) pulse generator capable of continuously converting the frequency of the ultrasonic signal in a predetermined band in order to change the radiation angle of the ultrasonic wave propagated to the test object through the wave guide 240. In the present specification, an ultrasonic detection method of continuously converting an ultrasonic frequency of 1 MHz from 0.8 MHz to 1.2 MHz and converting an emission angle of ultrasonic waves propagated to a test object through the waveguide 240 will be described as an example.

The ultrasonic sensor 220 converges the ultrasonic signal from the pulse generator 210 and transmits the ultrasonic signal to the wave guide 240 through the ultrasonic wedge 230 and propagates to the test body 270 through the wave guide 240. Then, the ultrasonic signal reflected from the test body 270 is received and transmitted to the shape detection device 290.

The ultrasonic wedge 230 is connected to the ultrasonic sensor 220 and serves to generate the ultrasonic signal as a plate wave. The phase velocity of the antisymmetric mode wave has a dispersion characteristic in which the propagation velocity varies with frequency in the frequency domain where the product fd of the frequency f and the waveguide 240 thickness d is 3 or less. Ultrasonic wedges 230 filled with a fluid containing water or glycerin are used for the sake of clarity.

4A is a graph illustrating the phase velocity dispersion characteristics of a plate wave according to the product of the frequency of the plate wave propagated in the wave guide 240 and the thickness of the wave guide 240.

4B is a graph showing the group speed dispersion characteristics of the plate wave according to the product of the frequency of the wave wave propagated in the wave guide 240 and the thickness of the wave guide 240.

As shown in FIGS. 4A and 4B, the plate wave has a dispersion property in which its propagation speed varies depending on the thickness of the plate through which it propagates, that is, the waveguide 240 and the frequency of the incident ultrasonic wave. Among the several wave modes, the 0th antisymmetric plate wave (A ₀ mode) is the dispersion of phase velocity and group velocity in the region where the product (fd) of the frequency (f) of the ultrasonic wave and the thickness (d) of the waveguide 240 is 3 or less. Since the characteristic is large, the physical characteristic that the incident angle and the radiation angle of the ultrasonic beam change rapidly in the region. As shown in FIGS. 4A and 4B, when the product fd of the ultrasonic wave frequency f and the waveguide 240 thickness d has a value between 0.5 and 2.5, a high dispersion region It is important to determine that the product fd of the frequency f of the ultrasonic wave and the thickness d of the waveguide 240 generates a plate wave having a value of the region.

3 is a view showing the configuration of the ultrasonic wedge 230 of the waveguide ultrasonic sensor device according to the present invention.

As shown in FIG. 3, in the waveguide ultrasonic sensor device according to the present invention, an ultrasonic wedge 320 is installed at an upper end of the wave guide 340, and a liquid 330 of water or glycerin is formed inside the ultrasonic wedge 320. Is filled, and the ultrasonic sensor 310 is installed on the upper end of the ultrasonic wedge 320.

Generally used ultrasonic wedges are made of a polymer material, the longitudinal velocity of the polymer wedge is usually about 2700m / s, the product of the frequency (f) and the waveguide 240 thickness (d) of the ultrasonic wave in Figure 4a and 4b (d) ), In the region of 2.5 or more, the phase velocity of the plate wave becomes 2700 m / s or more, so that the zeroth order antisymmetric plate wave below the velocity cannot be generated. In order to generate a zeroth order antisymmetric wave wave in a region of high dispersion, that is, a product fd of the frequency f of the ultrasonic wave and the thickness d of the waveguide 240 has a value between 0.5 and 2.5. Use a wedge made of a material whose longitudinal velocity (C _L ) is between 1500 m / s and 2000 m / s, or with a liquid such as water (C _L = 1480 m / s) or glycerin (C _L = 1920 m / s) Filled wedges should be used.

By filling the liquid 330 such as water or glycerin into the inside of the ultrasonic wedge 320 as shown in FIG. 3, by using the ultrasonic wedge 320, which makes the waveguide 340 directly contact the liquid, the frequency of ultrasonic waves f ), And the product fd of the waveguide 240 thickness d generates a zeroth order antisymmetric plate wave of the region having a value between 0.5 and 2.5, and improves the efficiency of the conversion of the ultrasonic beam radiation angle by frequency modulation. Can be. In addition, the ultrasonic wedge 320 is made of a semi-circular shape of the external shape of the portion where the ultrasonic sensor 310 is installed, the variable angle ultrasonic wave that can adjust the incident angle of the ultrasonic signal transmitted to the waveguide through the ultrasonic sensor 310 It may be composed of a wedge 320.

The waveguide 240 is connected to the ultrasonic wedge 230, receives the wave wave from the ultrasonic wedge 230, propagates the wave wave to the test body 270 of the liquid metal furnace 280, and reflects from the test body 270. One or more reflected signals whose blind spots change rapidly are received and transmitted to the ultrasonic sensor 220. In the present specification, a plate-shaped waveguide of a thin long stainless steel having a thickness of about several millimeters and a few meters in length is used for propagation of the wave.

The protective tube 250 protects the waveguide 240 from the high-temperature, radioactive sodium liquid metal, and the waveguide 240 does not directly contact the liquid sodium, so that the propagation energy of the plate wave does not escape into the sodium. The guide 240 is spaced apart from the surface by a predetermined length and installed in a form surrounded by a predetermined metal.

Since the liquid metal furnace 280 is filled with opaque high temperature sodium and cannot be optically inspected, the liquid metal furnace 280 detects the shape of the liquid metal furnace 280 using the waveguide ultrasonic sensor device of the present invention.

When the ultrasonic wave signal propagated by the waveguide ultrasonic sensor device of the present invention is reflected back from the test object 270, the shape detecting device 290 analyzes the ultrasonic signal and analyzes the inside of the test body 270 and the liquid metal furnace 280. Detect the shape and derive the graphic. The shape detecting device 290 includes a computer including an oscilloscope and a predetermined software module, and in the present invention, the internal shape of the test body 270 and the liquid metal furnace 280 through the B-scan ultrasonic inspection method. Can be detected and derived into a given graphic.

Hereinafter, the principle and method of detecting the shape of the inside with a liquid metal more efficiently will be described in detail by modulating the frequency of the incident ultrasonic signal using the waveguide ultrasonic sensor device of the present invention to convert the beam radiation angle.

의 주파수 방정식을, 반대칭모드의 경우에는

의 주파수 방정식을 얻을 수 있다. 여기서, p와 q는 두께방향 파동벡터성분으로 각각

이고,

이며, k는 파수(wave number), h는 판의 두께이다. 상기의 식으로부터 판파는 그 위상속도가 주파수의 함수로 주어지는 분산(dispersive) 특성을 가짐을 알 수 있다. 즉, 판파의 위상속도는 판의 두께와 주파수에 따라 결정된다.In the waveguide in the form of a plate, there is a wave wave propagating along the plate. The Rayleigh-Lamb frequency equation can be obtained from the boundary condition that the stress should be zero at the plane boundary of the plate to obtain the phase velocity of the plate wave for symmetric and antisymmetric modes. In symmetric mode

Frequency equation, in the case of antisymmetric mode

You can get the frequency equation of. Where p and q are the wave direction vector components

ego,

Where k is the wave number and h is the thickness of the plate. It can be seen from the above equation that the wave has a dispersive characteristic whose phase velocity is given as a function of frequency. That is, the phase velocity of the wave is determined by the thickness and frequency of the plate.

임계각으로 전파된다. 여기서 C_L 은 액체내의 종파속도(물인 경우 상온에서 1480m/s이고 소듐인 경우 200℃에서 2450m/s)이고, C_p는 웨이브가이드에서 전파되는 판파의 위상속도이다. 예를 들어 판파의 위상속도가 2500m/s이고, 액체내의 종파속도가 1480 m/s인 경우, 초음파 빔의 방사각은 약 36°정도가 된다When the waveguide is submerged in the liquid, the wave wave propagating in the waveguide is converted into a longitudinal wave in the liquid, and the longitudinal wave in the liquid

Propagated at critical angle. Where C _L is the longitudinal wave velocity in the liquid (1480 m / s at room temperature for water and 2450 m / s at 200 ° C for sodium), and C _p is the phase velocity of the wave wave propagating in the waveguide. For example, if the phase velocity of the plate wave is 2500 m / s and the longitudinal wave velocity in the liquid is 1480 m / s, the radiation angle of the ultrasonic beam is about 36 °.

When the longitudinal wave propagated into the liquid is reflected by the reflector and returns to the angle of radiation angle q, the plate wave is generated in the waveguide, and the ultrasonic transducer detects the plate wave and detects the reflected signal. Through the mode conversion process as described above, the waveguide sensor can be transmitted and received.

In this case, since the ultrasonic beam emission angle q is determined by the longitudinal wave velocity C _L in sodium and the phase velocity Cp of the plate wave in the waveguide, the ultrasonic wave is modulated to convert the phase wave phase of the wave wave, Depending on the phase velocity, the radiation angle of the ultrasonic beam propagated to sodium can be converted.

By controlling the conversion of the ultrasonic beam radiation angle by the modulation of the frequency as described above, it is possible to detect the shape of the inside with the liquid metal, without going through the scanning requiring the mechanical operation of the waveguide.

FIG. 5 is a graph illustrating a change in amplitude according to a frequency of an ultrasonic signal propagated by a waveguide ultrasonic sensor of the present invention and reflected by a test object therein into a liquid metal.

FIG. 5 is a horizontal flat specimen and a test specimen having an inclination of ± 2 degrees while continuously modulating the incident pulse frequency of an ultrasonic wave having a frequency of 1 MHz to a 1 mm thick waveguide from 0.8 MHz to 1.2 MHz according to an embodiment of the present invention. A graph showing the amplitude distribution of the ultrasonic waves received from the diagram is shown.

In the graph of FIG. 5, the amplitude of the received ultrasonic wave reflected from the test object is changed according to the angle of the ultrasonic radiation beam that is changed according to the frequency modulation, and the center frequency of the amplitude distribution chart is changing. Received ultrasonic waves reflected from the horizontal flat specimen have a maximum amplitude at a frequency of 1 MHz, and receive ultrasonic waves reflected from a specimen having a +2 degree slope have a maximum amplitude at a frequency of 0.9 MHz and a slope of -2 degrees. The received ultrasonic waves reflected from the test specimen having the maximum amplitude at the frequency of 1.1 MHz. Therefore, since the received ultrasonic waves reflected from each test object have different frequencies with maximum amplitudes, the radiation angles corresponding to the respective frequency bands are derived, and the direction in which the derived radiation angles are directed is measured. The internal shape can be detected with metal.

6 is a flowchart illustrating a sequence of a waveguide ultrasonic detection method according to an embodiment of the present invention.

According to an embodiment of the present invention shown in FIG. 6, when an ultrasonic signal is generated through the synthesizer pulse generator 210 (S611), the generated ultrasonic signal is provided to the ultrasonic wedge 230 in which the ultrasonic sensor 220 is installed. By the conversion to the wave mode (S612) is transmitted to the wave guide 240. The ultrasonic signal transmitted to the waveguide 240 has a predetermined radiation angle and is emitted to the liquid metal in the liquid metal furnace 280 (S613). At this time, the ultrasonic signal emitted to the liquid metal is converted to the longitudinal wave mode (S614). ). The ultrasonic signal converted to the longitudinal wave mode and approaching the test body 270 inside the liquid metal furnace 280 is reflected by the test body 270 (S615) and propagates back to the waveguide 240 at the radial angle (S616). The reflected ultrasonic signal received from the waveguide 240 is converted back to the plate wave mode (S617) is transmitted to the shape detecting device 290, the shape detecting device receives and analyzes the ultrasonic signal (S618), the analysis Based on the result, the shape of the internal test body 270 is detected with the liquid metal (280) (S619). When step S619 is performed to detect the shape of the test body 270, the synthesizer pulse generator 210 modulates the frequency to generate an ultrasonic signal, and performs the above operation again with the ultrasonic signal having the modulated frequency. Done. The frequency modulation of step S620 may be performed after the shape detection step S619 is performed as in the embodiment of FIG. 6, or may be continuously performed in the generation step S611 of the ultrasonic signal.

Embodiments of the invention also include computer-readable media containing program instructions for performing various computer-implemented operations. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The medium or program instructions may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. The medium may be a transmission medium such as an optical or metal wire, a waveguide, or the like including a carrier wave for transmitting a signal specifying a program command, a data structure, or the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like.

7 is an internal block diagram of a general purpose computer system that may be employed to construct a waveguide ultrasonic sensor device in accordance with the present invention.

Computer system 700 includes one or more processors 701 connected to a main memory including random access memory (RAM) 702 and read only memory (ROM) 703. The processor 701 is also called a central processing unit (CPU). As is well known in the art, the ROM 703 serves to pass data and instructions to the CPU unidirectionally, and the RAM 702 typically transfers data and instructions bidirectionally. Used to. RAM 702 and ROM 703 may include any suitable form of computer readable media. Mass storage 704 is bidirectionally coupled to processor 701 to provide additional data storage capability, and may be any of the computer readable recording media described above. The mass storage device 704 is used to store programs, data, and the like, and is typically an auxiliary memory device such as a hard disk which is slower than the main memory device. Certain mass storage devices such as CD ROM 706 may be used. The processor 701 may be one or more input / output interfaces, such as a video monitor, trackball, mouse, keyboard, microphone, touchscreen display, card reader, magnetic or paper tape reader, voice or handwriting reader, joystick, or other known computer input / output device. 705 is connected. Finally, the processor 701 may be connected to a wired or wireless communication network through the network interface 707. Through this network connection, the procedure of the method described above can be performed. The apparatus and tools described above are well known to those skilled in the computer hardware and software arts.

The hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention.

 According to the waveguide ultrasonic sensor device and method of the present invention, by converting the radiation angle of the ultrasonic beam by continuously modulating the frequency of the ultrasonic signal in a predetermined band, to detect the shape inside the liquid metal without mechanical driving of the waveguide ultrasonic sensor device The effect can be obtained.

In addition, according to the waveguide ultrasonic sensor device and method of the present invention, by implementing the electronic scanning of the waveguide ultrasonic sensor according to the frequency modulation, overcome the limitation of the scanning range of the waveguide ultrasonic sensor according to the mechanical drive in more detail liquid metal The effect of detecting the internal shape of the furnace can be obtained.

In addition, according to the waveguide ultrasonic sensor device and method of the present invention, by installing a wave guide from the penetrating portion of the upper portion of the reactor to the high temperature liquid metal into the sodium, and by installing an ultrasonic sensor on the upper portion of the reactor, any problems with high temperature or high radioactivity By oscillating the ultrasonic wave without the liquid, it is possible to obtain the effect of detecting the inner shape with the liquid metal more safely and efficiently.

In addition, according to the waveguide ultrasonic sensor device and method of the present invention, a waveguide ultrasonic wave can be implemented in a single waveguide ultrasonic sensor can implement a phased array ultrasonic oscillation method of driving a plurality of sensors by an electronic method, The effects provided by the sensor device and method can be obtained.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above-described embodiments, which can be variously modified and modified by those skilled in the art to which the present invention pertains. Modifications are possible. Accordingly, the spirit of the present invention should be understood only by the claims set forth below, and all equivalent or equivalent modifications thereof will belong to the scope of the present invention.

Claims (8)

In the waveguide ultrasonic sensor device, A synthesizer pulse generator for generating one or more ultrasonic signals whose frequency is continuously modulated in a predetermined band; An ultrasonic sensor that converges the one or more ultrasonic signals from the synthesizer pulse generator to transmit the ultrasonic signals to a predetermined test body, and receives the ultrasonic signals reflected from the test body; An ultrasonic wedge connected to the ultrasonic sensor to receive the one or more ultrasonic signals to generate the one or more ultrasonic signals as one or more plate waves having different phase speeds; A waveguide connected to the ultrasonic wedge, receiving the one or more plate waves from the ultrasonic wedge and emitting the one or more plate waves to the test body at respective radial angles, and receiving one or more reflected signals reflected from the test body; And A protective tube installed to be spaced apart from the wave guide by a predetermined distance and formed to surround the outside of the wave guide Waveguide ultrasonic sensor device comprising a. The method of claim 1, The ultrasonic wedge is composed of a material having a velocity of between 1,500 m / s and 2000 m / s, or a liquid wedge filled with water or glycerin, and the angle of incidence can be varied. Ultrasonic sensor device. The method of claim 1, The wave wave is a waveguide ultrasonic sensor device, characterized in that the phase speed of the wave wave is changed by the ultrasonic signal that the frequency is continuously converted. The method of claim 1, The waveguide is configured in the form of a plate made of stainless steel, and the waveguide comprises a symmetric mode having a symmetrical distribution with respect to the central axis of the plate thickness or an antisymmetrical mode having an antisymmetric distribution with each other. Ultrasonic sensor device. The method of claim 1, A shape detecting device which receives the reflected signal from the waveguide and detects a shape of the test object Waveguide ultrasonic sensor device further comprises. In the waveguide ultrasonic detection method, Generating one or more ultrasonic signals whose frequencies are continuously converted in a predetermined band; Transmitting the one or more ultrasonic signals to an ultrasonic sensor coupled with an ultrasonic wedge; Generating the at least one ultrasonic signal with at least one plate wave having a different phase velocity; Emitting the at least one fan wave at different radiation angles into a predetermined liquid metal; And Receiving one or more reflection signals from a predetermined test object located inside the liquid metal Waveguide ultrasonic detection method comprising a. The method of claim 6, Detecting the shape of the test object by using the received reflected signal Waveguide ultrasonic detection method further comprises. A computer-readable recording medium having recorded thereon a program for executing the method of claim 6.

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