JP2010025812A - Hybrid measuring apparatus using electromagnetic ultrasonic probe and inspection method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hybrid measuring apparatus capable of measuring not only the accurate wall thickness reduced value of piping along with the temperature of piping, but also the temperature of an internal liquid. <P>SOLUTION: In the hybrid measuring apparatus capable of measuring the reduced wall thickness of the piping (w) through which a liquid flows, two electromagnetic ultrasonic probes 11 and 12 having magnets 15-17 and coils 13 and 14 are arranged on the outer periphery of the piping in opposed relationship. The electromagnetic ultrasonic probes are stacked so that a first coil 13 and a second coil 14 respectively consisting of windings may be arranged in parallel to each other so as to turn current inlet sides 13a and 14a toward the same side and the current inlet side or outlet side 13b of the first coil is positioned between the windings 140 of second coil. The magnets are arranged at three places of the gap between the windings of the first coil and the current inlet and outlet sides of the coil so that an N-pole and an S-pole may be alternately arranged on the side of the coils and a magnetizing direction is turned toward the direction coming into contact with and separating from the coils. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  In particular, the present invention uses a hybrid measuring apparatus using an electromagnetic ultrasonic probe capable of measuring the thinning amount and surface temperature of a pipe of a large plant such as a nuclear power generation facility and the internal liquid temperature, and the same. It relates to the inspection method.

Large-scale plant facilities are generally provided with a lot of pipes that connect each device, etc., and these pipes are cut off by the liquid that circulates in the interior due to long-term use. As a result, if a hole or a crack is formed, an accident caused by the outflow of the liquid may be caused.
For this reason, in plant facilities, it has been practiced that an operator inspects pipe thinning by bringing an ultrasonic probe into contact with the outer periphery of the pipe.

However, when the temperature of the liquid is high, the pipe is also heated to a high temperature. Therefore, it is difficult to perform a thinning inspection of the pipe while the plant is operating with this manual inspection method such as an ultrasonic probe.
Therefore, there is a need for a thinning inspection apparatus that inspects pipe thinning regardless of pipe temperature even during plant operation.
In addition to this, as pipe inspection, pipe temperature and liquid temperature in the pipe can change when an abnormality occurs in the plant, so it is also necessary to measure these pipe temperature and liquid temperature. .

On the other hand, a method for inspecting a thinning amount of the inner wall surface of the pipe using the ultrasonic probe shown in Patent Document 1, or an electromagnetic ultrasonic probe capable of traveling in the pipe shown in Patent Document 2. 2. Description of the Related Art An inspection apparatus that measures the amount of thinning of the pipe outer periphery by using a pipe is known.
In general, a thermocouple or the like is used as an apparatus for measuring the piping temperature.

JP 2004-163250 A Japanese Patent Laid-Open No. 9-281087

  However, the pipe thinning amount and pipe temperature can be measured by using the measurement system equipped with the thermocouple in the inspection apparatus used in the inspection method of Patent Document 1 and the inspection apparatus of Patent Document 2. However, the temperature of the liquid in the piping cannot be measured. In addition, when the amount of thinning of the pipe is determined by the pulse echo method and / or electromagnetic ultrasonic resonance method using the speed of sound based on the pipe temperature, the measurement by the measuring unit using the thermocouple and the measuring unit using the inspection device Since the position is different, an error occurs in the temperature, and an error occurs in the sound speed used due to the error. Therefore, there is a disadvantage that an accurate amount of thinning cannot be obtained.

  Therefore, the present invention has been made in view of such circumstances, and uses an electromagnetic ultrasonic probe that can accurately measure the amount of pipe thinning along with the temperature of the pipe and can also measure the temperature of the internal liquid. It is an object of the present invention to provide a hybrid measuring apparatus and an inspection method using the same.

  That is, the invention according to claim 1 is a hybrid measurement device using an electromagnetic ultrasonic probe capable of measuring the thickness reduction and surface temperature of a pipe through which liquid flows and the temperature of the liquid, Two electromagnetic ultrasonic probes having a magnet and a coil are arranged opposite to each other on the outer periphery of the pipe, and the electromagnetic ultrasonic probe includes a first coil and a second coil each comprising a winding, The current inlet sides are arranged in parallel with each other in the same direction, and the current inlet side or the outlet side of the first coil is laminated between the windings of the second coil. The magnet is alternately arranged with N poles and S poles on the coil side at equal intervals between the windings of the second coil and at three locations on the current entrance side and the exit side of the coil sandwiching the magnet. The magnetization direction of the coil By being arranged in the direction of contact and separation, a longitudinal wave transceiver configured by the second coil and the magnets respectively disposed at the three locations, the first coil, and the first coil There is provided a transverse wave transmitter / receiver configured by magnets arranged between the windings of the second coil corresponding to the coil and at two positions on the exit side or the entrance side of the current.

  The invention described in claim 2 is the hybrid measuring apparatus using the electromagnetic ultrasonic probe according to claim 1, wherein the two electromagnetic ultrasonic probes are positioned below the surface of the liquid. Current wiring for supplying current to the first coil and the second coil is connected to each other, and at least one of the first coil and the second coil is in contact with the pipe. It is characterized by being connected to the wiring of a resistance measuring device that measures the resistance value of the coil.

  Furthermore, the invention described in claim 3 is the hybrid measurement apparatus using the electromagnetic ultrasonic probe according to claim 2, wherein the current wiring includes a first coil to which the resistance measurement wiring is connected, and At least one of the second coils is connected to the electromagnetic ultrasonic probe as a composite cable together with the resistance measurement wiring, and the resistance measurement instrument is a measurement arithmetic device for calculating the surface temperature of the pipe. The measurement calculation device is provided so that the temperature of the pipe can be calculated from the resistance of the coil, and the transverse wave transmitted from the transverse wave transceiver of one of the electromagnetic ultrasonic probes is the pipe. The reflected wave reflected at the interface with the liquid is received by the transverse wave transmitter / receiver of the one electromagnetic ultrasonic probe, so that the position at which the one electromagnetic ultrasonic probe is disposed is Thinning of the tube is characterized in that is provided to be operational.

  According to a fourth aspect of the present invention, in the hybrid measurement apparatus using the electromagnetic ultrasonic probe according to the third aspect, the measurement calculation device is configured to receive the transverse wave transmitter / receiver of the other electromagnetic ultrasonic probe. The two electromagnetic ultrasonic probes are received by receiving the reflected wave, which is the reflected transverse wave reflected at the interface of the pipe with the liquid, by the transverse wave transmitter / receiver of the other electromagnetic ultrasonic probe. The thickness reduction amount of the pipe at the position where the pipe is disposed is provided so that it can be calculated, the inner diameter of the pipe corrected by the thickness reduction amount, and the longitudinal wave transmission of one of the electromagnetic ultrasonic probes The longitudinal wave velocity is obtained from the time until the longitudinal wave transmitter / receiver of the other electromagnetic ultrasonic probe receives the longitudinal wave transmitted from the detector, and the velocity of the longitudinal wave obtained in advance is calculated. The temperature of the above liquid can be calculated from the relationship with the liquid temperature. It is characterized in that is provided.

According to a fifth aspect of the present invention, in the hybrid measurement device using the electromagnetic ultrasonic probe according to the third or fourth aspect of the invention, the measurement calculation device may be configured so that the pipe after the transverse wave transmitter transmits a transverse wave. a time difference between time T _{n + 1} to the reception time T _n and n + 1 th reflected wave to the reception of the n-th reflected wave of the multiple reflections to be reflected at the interface between the liquid (T n _{+ 1} -T _n ) is divided by a value twice the transverse wave velocity v based on the pipe temperature, and the pipe thickness D is calculated so as to be calculated by a pulse echo method according to the following equation. .
D = (T _{n + 1} −T _n ) / 2v

A sixth aspect of the present invention is the hybrid measurement apparatus using the electromagnetic ultrasonic probe according to any one of the third to fifth aspects, wherein the measurement calculation device includes a resonance frequency f _n and a frequency of the resonance frequency f _n . It is characterized in that the pipe thickness D can be calculated by an electromagnetic ultrasonic resonance method which is calculated according to the following formula based on the order n and the velocity v of the transverse wave based on the pipe temperature.
D = n (v / 2f _n )

  A seventh aspect of the present invention is a hybrid measurement apparatus using the electromagnetic ultrasonic probe according to any one of the fourth to sixth aspects, wherein the longitudinal wave transmitter / receiver of the other electromagnetic ultrasonic probe is used. The coils constituting the other electromagnetic ultrasonic probe are more wire than the transverse wave transmitter / receiver of the other electromagnetic ultrasonic probe, the longitudinal wave transmitter / receiver of the one electromagnetic ultrasonic probe, and the coil constituting the transverse wave transmitter / receiver. It is characterized by a small diameter.

  According to an eighth aspect of the present invention, in the hybrid measurement apparatus using the electromagnetic ultrasonic probe according to any one of the fourth to sixth aspects, the one electromagnetic ultrasonic probe and the other electromagnetic ultrasonic wave are used. The current wiring of the acoustic probe is connected to the ultrasonic generator via a transmission switch.

  According to a ninth aspect of the present invention, there is provided a method for inspecting a pipe in contact with the pipe using the hybrid measuring apparatus using the electromagnetic ultrasonic probe according to any one of the fourth to eighth aspects. Measuring the direct current resistance of the coil that is being used to determine the pipe temperature, and receiving the reflected wave of the transverse wave transmitted by the transverse wave transceiver of the one electromagnetic ultrasonic probe and the other electromagnetic ultrasonic probe. And the longitudinal wave transmitter / receiver of the other electromagnetic ultrasonic probe transmits the longitudinal wave transmitted from the longitudinal wave transmitter of the one electromagnetic ultrasonic probe. The speed of the longitudinal wave is calculated from the time until reception and the inner diameter of the pipe obtained from the thinning amount, and the temperature of the liquid is obtained from the relationship between the speed and the liquid temperature.

According to the hybrid measuring apparatus using the electromagnetic ultrasonic probe according to claim 1, two electromagnetic ultrasonic probes are arranged opposite to each other on the outer periphery of the pipe, and each electromagnetic ultrasonic probe is arranged. Has a longitudinal wave transceiver and a transverse wave transceiver, and the longitudinal wave transceiver and the transverse wave transceiver each have a coil and a magnet, so the relationship between the temperature of the pipe and the resistance value is obtained in advance. Thus, the pipe temperature can be calculated by measuring the resistance value of the coil.
Furthermore, since the speed of the transverse wave transmitted by the transverse wave transmitter of each electromagnetic ultrasonic probe is uniquely determined by this pipe temperature, each electromagnetic ultrasonic probe is received by receiving the multiple reflected waves of this transverse wave. The thickness of the pipe at the child installation position can be measured. Therefore, it is possible to measure the thickness of the pipe at the position where the velocity of the transverse wave was obtained by measuring the pipe temperature, and to obtain an accurate pipe thickness reduction without causing a pipe thickness measurement error due to the difference in measurement position. be able to.

In addition to this, the inner diameter of the pipe is obtained from the above accurate pipe thinning amount, and after the longitudinal wave is transmitted by the longitudinal wave transmitter / receiver of one electromagnetic ultrasonic probe, the other electromagnetic ultrasonic probe The longitudinal wave velocity is calculated by measuring the time until the longitudinal wave is received by the longitudinal wave transmitter / receiver, and the liquid temperature is calculated from the relationship between the longitudinal wave velocity and the liquid temperature obtained in advance. Can be calculated.
Therefore, by measuring the passage time of the longitudinal wave at the position where the accurate pipe inner diameter is required from the accurate pipe thinning amount, it is possible to prevent an error due to the difference in the measurement position and to prevent the accurate liquid flow. Temperature can be measured.

In particular, according to the hybrid measurement apparatus of the second aspect, when the temperature of the liquid is measured by installing the electromagnetic ultrasonic probe so as to be positioned below the liquid surface, It is possible to prevent a measurement error caused by the longitudinal wave transmitted from the longitudinal wave transmitter / receiver of the acoustic probe passing through the gas on the liquid surface.
Furthermore, the pipe temperature can be simply calculated by measuring the resistance of the coil that is in contact with the pipe through the wiring by a resistance measuring device.

  In addition to this, according to the hybrid measurement device of the third aspect, the electromagnetic ultrasonic probe can be easily installed on the outer periphery of the pipe by using the current wiring as the composite wiring together with the resistance measurement wiring. . In addition to the pipe temperature, the measurement calculation device can measure the amount of pipe thinning, and the pipe management system can be simplified.

  Furthermore, according to the hybrid measurement device of the fourth aspect, it is possible to measure the pipe thinning amount in both two places where the electromagnetic ultrasonic probe of the pipe is installed by the measurement arithmetic device. When measuring the temperature of the liquid, a more accurate liquid temperature can be obtained.

  Further, according to the hybrid measurement device of claim 5, by the pulse echo method, in particular, the thickness of the pipe having a thickness of 5 mm or more can be accurately obtained, and the thickness reduction can be measured, According to the hybrid measuring apparatus of the sixth aspect, the thickness reduction can be measured by accurately obtaining the thickness of a pipe having a thickness of 5 mm or less by the electromagnetic wave ultrasonic resonance method.

  Furthermore, according to the hybrid measuring apparatus of claim 7, the reception surface area is increased by making the coil of the longitudinal wave transmitter / receiver of the other electromagnetic ultrasonic probe smaller than the other coils. Thus, the longitudinal wave reception sensitivity can be improved.

  Further, according to the hybrid measurement device of the eighth aspect, for example, an ultrasonic generator is connected to one electromagnetic ultrasonic probe, and the resistance value of the coil of the one electromagnetic ultrasonic probe is determined. Along with pipe temperature measurement and pipe thickness measurement by reflected wave measurement of the transverse wave transmitter / receiver, after transmitting the longitudinal wave from the longitudinal wave transmitter / receiver, the transmission generator switches the ultrasonic generator to the other electromagnetic ultrasonic wave. By connecting to the probe, the pipe temperature can be measured from the resistance value of the coil of the other electromagnetic ultrasonic probe, and the pipe thickness can be measured by the reflected wave measurement of the transverse wave transceiver. Further, the time from when the longitudinal ultrasonic wave is transmitted until the other electromagnetic ultrasonic probe receives the longitudinal wave is measured, and both of the two places where the electromagnetic ultrasonic probe is installed are measured. The temperature of the liquid can be calculated by deriving the velocity of the longitudinal wave from the pipe inner diameter obtained from the pipe thickness and the above time.

  Therefore, by providing a transmission switching device, one ultrasonic generator can be connected to one and the other electromagnetic ultrasonic probe in order, and the pipe temperature, pipe thickness, and liquid temperature can be inspected. It is not necessary to provide two ultrasonic generators, and the entire apparatus can be reduced in size.

Therefore, as in the pipe inspection method according to claim 9, the pipe temperature is obtained from the coil resistance value, and the transverse wave transmitter / receiver of one electromagnetic ultrasonic probe and the other electromagnetic ultrasonic probe is provided. The thickness of the pipe is obtained by receiving the reflected wave of the transmitted transverse wave, and the longitudinal wave transmitted from the longitudinal wave transmitter of the one electromagnetic ultrasonic probe is the other electromagnetic ultrasonic probe. By measuring the time until the longitudinal wave transmitter / receiver of the tactile receives, the temperature of the liquid is obtained from the velocity of the longitudinal wave based on the inner diameter of the pipe obtained from the thinning amount, and it is accurate and efficient. In addition, the piping temperature, wall thickness and liquid temperature can be measured.
Therefore, when there is an abnormality in the measurement results of the pipe temperature, the pipe thickness, and the liquid temperature, it can be easily detected.

Next, the hybrid measuring apparatus according to the present invention and the inspection method using the same will be described.
First, as shown in FIGS. 1 to 5, in the hybrid measurement apparatus of this embodiment, electromagnetic ultrasonic probes (hereinafter referred to as EMAT sensors) 11 and 12 are respectively provided at two opposing positions on the outer periphery of the pipe w. Two of these first EMAT sensor (one electromagnetic ultrasonic probe) 11 and second EMAT sensor (the other electromagnetic ultrasonic probe) 12 are respectively disposed in the liquid. It is installed so that it may be located below the surface. Then, the hybrid measurement device is provided so that the thinning of the pipe w at the installation location of the sensors 11 and 12 can be measured by transmitting and receiving the transverse waves by the EMAT sensors 11 and 12, and transmitted from the first EMAT sensor 11. The liquid temperature can be measured by receiving the longitudinal wave by the second EMAT sensor 12.

  In each EMAT sensor 11, 12, two coils 13, 14 each having a substantially rectangular shape in plan view, each consisting of a winding, have the same side as the current inlet side 13 a, 14 a of the winding that is one end side in the short direction (FIG. 3). The first coil (one coil) 13 is arranged in parallel with each other toward the middle left hand side, and the winding current outlet side 13b on the other side in the short direction of the first coil (one coil) 13 is connected to the second coil (the other coil). The coil) 14 is laminated so as to be positioned on the cavity between the windings 140. The first coil 13 and the second coil 14 of the first EMAT sensor 11 and the first coil 13 of the second EMAT sensor 12 are linear φ0.2 mm, the number of turns 44, and the short direction is The second coil 14 of the second EMAT sensor 12 has a linear φ of 0.1 mm and a number of turns of 79, except that the second coil 14 of the second EMAT sensor 12 is 23 mm, the longitudinal direction is 30 mm, and the width of the cavity in the lateral direction is 3 mm. The configuration is the same as other coils.

  Further, each EMAT sensor 11, 12 is equidistant between three windings 140 of the second coil 14 and at three locations on the current inlet side 14 a and outlet side 14 b of the second coil 14 sandwiching the EMAT sensor 11, 12. Permanent magnets 15, 16, and 17 are arranged on the coil side so that N poles and S poles are alternately arranged with the magnetizing direction toward and away from the coils 13 and 14, and the coils 13 and 14 are piped On the w side, the second coil 14 is placed in contact with the outer periphery of the pipe w. In addition, as the permanent magnet 15, a plurality (three in the present embodiment) of permanent magnets 15 a to 15 c are arranged in a line in the longitudinal direction of the coils 13 and 14, and similarly, the permanent magnets 16 and 17. As above, a plurality (three in the present embodiment) of permanent magnets 16 a to 16 c and 17 a to 17 c are arranged in a line in the longitudinal direction of the coils 13 and 14. As a result, each of the EMAT sensors 11 and 12 includes nine permanent magnets 15a to 15c, 16a to 16c, and 17a to 17c.

  Each EMAT sensor 11, 12 has a longitudinal wave transmitter / receiver 18 constituted by a second coil 14 and nine permanent magnets 15 a to 15 c, 16 a to 16 c, and 17 a to 17 c respectively disposed at the three positions. And six wires disposed at two locations corresponding to the first coil 13 and the first coil 13, that is, between the windings 140 of the second coil 14 and the current inlet side 14a of the second coil 14, respectively. Of the permanent magnets 15a to 15c and 16a to 16c. Connected to each EMAT sensor 11, 12 is a composite cable 2 having a current supply wiring for supplying a current to each coil 13, 14 and a resistance measurement wiring for measuring the resistance of the second coil 14 in contact with the pipe w. ing.

  On the other hand, the said piping w consists of carbon steel or stainless steel, and the heat insulating material w1 is provided in the outer periphery. Mounting holes w10 of the first EMAT sensor 11 and the second EMAT sensor 12 are respectively formed in the heat insulating material w1, and the heat insulating materials w1 cut out to form these mounting ports w10 are respectively It is processed so as to reduce the thickness, and the cover member w2 is provided so that the attachment port w10 of the first EMAT sensor 11 and the second EMAT sensor 12 can be closed. These lid members w2 are provided at the center thereof so that the composite cable 2 can pass therethrough. Thereby, the 1st EMAT sensor 11 and the 2nd EMAT sensor 12 are installed in the attachment port w10, and the composite cable 2 penetrates the cover member w2, and is extended outside the heat insulating material w1.

In each composite cable 2, each current supply wiring is connected to the output side of the burst wave ultrasonic generator 30 via the transmission switch 31, and each resistance measurement wiring is connected to the DC resistance measuring device 40 via the switch 41. It is connected to the. Furthermore, the current wiring connected to the second coil 14 of the second EMAT sensor 12 is also connected to the burst wave ultrasonic generator 30 via the preamplifier 51. The burst wave ultrasonic generator 30 is The oscilloscope 52 is connected to a personal computer (measurement arithmetic unit) 5.
The personal computer 5 is also connected to the output section of the DC resistance measuring device 40, and is provided so that the temperature of the pipe w can be calculated from the resistance value measured by the DC resistance measuring device 40.

Next, an inspection method using the above-described hybrid measurement apparatus will be described with reference to FIG.
First, before performing the inspection, the relationship between the direct current resistance value and the pipe w temperature is obtained, and the relationship between the acoustic velocity of the longitudinal wave and the liquid temperature is obtained.

Then, the burst wave ultrasonic generator is operated to supply a direct current to the first coil 13 of the first EMAT sensor 11 and the second coil 14 in contact with the pipe w, and this second current is supplied. By measuring the DC resistance value of the coil 14 with the DC resistance measuring device 40, the temperature of the pipe w is obtained by the personal computer 5 from the relationship between the DC resistance and the temperature of the pipe w.
At the same time, the transverse wave transmitted from the transverse wave transmitter / receiver 19 of the first EMAT sensor 11 is reflected by the transverse wave transmitter / receiver 19 to receive the reflected wave reflected by the interface between the pipe and the liquid. A thickness reduction amount a1 of the thickness D1 is obtained.

The thickness D1 of the pipe w is the time from when the transverse wave transmitter / receiver 19 transmits the transverse wave until the nth reflected wave of the multiple reflection reflected at the interface of the pipe w, that is, the inner wall surface of the pipe w, is received. time difference between time T _{n + 1} to the reception of the T _n and n + 1 th reflected wave _{(T n + 1 -T n)} , at twice the value of the acoustic velocity V _th of transverse waves based on the temperature of the pipe w It is calculated | required by the pulse echo method by the following formula | equation (1).
D = (T _{n + 1} −T _n ) / 2V _Th (1)
Further, the pipe thickness D can also be obtained by an electromagnetic ultrasonic resonance method based on the following equation (2) based on the sound velocity V _Th of the transverse wave based on the resonance frequency f _n , the order n of the frequency, and the temperature of the pipe w.
D = n (V _Th / 2f _n ) (2)

Accordingly, the data such as the time T _n is measured and transmitted to the personal computer 5 via the burst wave ultrasonic generator 30 and the oscilloscope 52, so that the personal computer 5 uses the wall thickness D1 of the pipe w. The thickness reduction a1 from the initial value is obtained.
At this time, when the wall thickness D1 of the pipe w is equal to or greater than a predetermined thickness determined by the accuracy of the pulse echo within the range of 2 mm or more and 6 mm or less by the personal computer 5, the pulse echo method according to the above equation (1) is used. Therefore, when the thickness reduction amount a1 is calculated and the thickness D1 is less than the predetermined thickness, the thickness reduction amount a1 of the pipe w is calculated according to the electromagnetic ultrasonic resonance method according to the above equation (2).

  Also, the time from when the longitudinal wave is transmitted by the longitudinal wave transceiver 18 of the first EMAT sensor 11 to when the longitudinal wave of the second EMAT sensor 12 is received by the longitudinal wave transceiver 18 is expressed by the preamplifier 51, The personal computer 5 measures through the burst wave ultrasonic generator 30 and the oscilloscope 52.

Next, the transmission switch 31 switches the current flow from the first EMAT sensor 11 to the second EMAT sensor 12, and the switch 41 switches the measurement target of the DC resistance measuring instrument 40 from the first EMAT sensor 11. Switch to the second EMAT sensor 12.
As a result, a direct current is supplied to the first coil 13 of the second EMAT sensor 12 and the second coil 14 in contact with the pipe w, and the direct current resistance value of the second coil 14 is measured by the direct current resistance measurement. By measuring with the vessel 40, the temperature of the pipe w is obtained by the personal computer 5 from the relationship between the DC resistance and the temperature of the pipe w.

At the same time, the transverse wave transmitted from the transverse wave transmitter / receiver 19 of the second EMAT sensor 12 is reflected by the transverse wave transmitter / receiver 19 to receive the reflected wave reflected at the interface between the pipe and the liquid. A thickness reduction amount a2 of the thickness D2 is obtained.
The thickness a2 of the thickness D2 of the pipe w is equal to or less than the predetermined thickness determined by the accuracy of the pulse echo by the personal computer 5 as in the first EMAT sensor 11. The thickness reduction amount a2 from the initial value is calculated based on the wall thickness D2 obtained by the pulse echo method according to the above equation (1), and when the wall thickness D2 is less than the predetermined thickness, the above equation Based on the thickness D2 obtained by the electromagnetic ultrasonic resonance method according to (2), the thickness reduction a2 from the initial value is calculated.

Then, by adding the thicknesses a1 and a2 of the thicknesses D1 and D2 of the pipe w obtained from the first EMAT sensor 11 and the second EMAT sensor 12 to the initial value Lo of the inner diameter of the pipe w, the pipe w Is determined. The thickness reductions a1 and a2 mean the wall thickness. Next, the acoustic velocity of the longitudinal wave is obtained from the inner diameter L of the pipe w and the longitudinal wave transmission / reception time measured by the personal computer 5, and the liquid temperature is obtained from the relationship between the previously obtained acoustic velocity and the liquid temperature. It is done.
As a result, the temperature of the pipe w and the thicknesses D1 and D2 of the place where the first EMAT sensor 11 and the second EMAT sensor 12 are installed by the personal computer 5 and the temperature of the liquid in the pipe w are obtained. Even when an abnormality occurs in a large plant, it can be instantaneously detected.

In the above-described embodiment, a plurality of permanent magnets 15a to 15c, 16a to 16c, and 17a to 17c are used as the permanent magnets 15, 16, and 17, respectively, but the present invention is not limited to this. Instead, the permanent magnets 15, 16, and 17 are each formed in a single shape, and are provided at equal intervals between the windings 140 of the second coil 14 and the current inlet side and the outlet side of the coil 14 that sandwiches the permanent magnets 15, 16, and 17. Accordingly, the coils 13 and 14 may be arranged in the longitudinal direction, and any one that can transmit and receive a transverse wave and a longitudinal wave is sufficient. Further, instead of the permanent magnets 15, 16, 17, electromagnets may be used.
Further, the present invention is not limited to the above-described embodiment. For example, the second coil 14 may be stacked on the first coil 13, and in this case, the first coil The resistance measurement wiring is connected to 13. In addition, in the case where the thicknesses D1 and D2 of the pipe w are greater than or equal to the predetermined thickness and less than the predetermined thickness, the thickness D1 of the pipe w is determined by both the pulse echo method and the electromagnetic ultrasonic resonance method. D2 may be obtained.

  According to the hybrid measurement device and the inspection method using the same according to the present embodiment, the first EMAT sensor 11 and the second EMAT sensor 12 are arranged opposite to each other on the outer periphery of the pipe w, and the second EMAT sensors 11 and 12 When data such as the DC resistance of the pipe w measured by the resistance measuring instrument 40 connected to the coil 14 is transmitted to the personal computer 5, the personal computer 5 is obtained in advance to obtain the relationship between the DC resistance of the pipe w and the pipe temperature. By inputting, the temperature of the pipe w can be calculated by the computer 5.

  Furthermore, since the sound velocity of the transverse wave is uniquely determined by this pipe temperature, the multiple reflected waves of the transverse wave transmitted by the transverse wave transmitter / receiver 19 of each EMAT sensor 11, 12 are received and the received data is sent to the personal computer 5. By transmitting the data, the computer 5 can calculate the thicknesses D1 and D2 of the pipes w at the installation positions of the EMAT sensors 11 and 12 according to the pulse echo method or the magnetosonic resonance method. Accordingly, it is possible to measure the thicknesses D1 and D2 of the pipe w at the position where the temperature of the pipe w is measured to obtain the sound velocity of the transverse wave, and a measurement error of the thicknesses D1 and D2 of the pipe w due to the difference in measurement position occurs. Without being able to calculate the exact thickness reductions a1 and a2 of the pipe w.

In addition to this, the inner diameter L of the pipe w is obtained from the accurate thickness reductions a1 and a2 of the pipe w, and the second wave is transmitted after the longitudinal wave is transmitted by the longitudinal wave transceiver 18 of the first EMAT sensor 11. The time until the longitudinal wave is received by the longitudinal wave transmitter / receiver 18 of the EMAT sensor 12 is measured by the personal computer 5 to obtain the acoustic velocity of the longitudinal wave, and the relationship between the acoustic velocity and the liquid temperature is obtained in advance. By setting the temperature, the temperature of the liquid can be calculated.
Therefore, by measuring the longitudinal wave transmission / reception time at the position where the accurate inner diameter L of the pipe w is determined from the accurate thickness reductions a1 and a2 of the pipe w, it is possible to prevent an error due to the difference in the measurement position. Thus, an accurate liquid temperature can be measured.

1 is a configuration explanatory diagram of a hybrid measurement device of the present embodiment. FIG. 3 is a schematic plan view of the EMAT sensors 11 and 12 and is a configuration explanatory diagram for explaining that a longitudinal wave transceiver 18 and a transverse wave transceiver 19 are provided. It is a cross-sectional schematic diagram of the EMAT sensors 11 and 12. It is a cross-sectional schematic diagram for demonstrating the attachment to the piping w of the EMAT sensors 11 and 12. FIG. It is a perspective view for demonstrating the attachment to the piping w of the EMAT sensors 11 and 12. FIG. It is a flowchart explaining the inspection method using the hybrid measuring device of this embodiment.

Explanation of symbols

11 First EMAT sensor (one electromagnetic ultrasonic probe)
12 Second EMAT sensor (the other electromagnetic ultrasonic probe)
13 First Coil 13a First Coil Current Inlet Side 13b First Coil Current Outlet Side 14 Second Coil 14a Second Coil Current Inlet Side 14b Second Coil Current Outlet Side 15-17 Permanent magnet 18 Longitudinal wave transmitter / receiver 19 Transverse wave transmitter / receiver 30 Burst wave ultrasonic generator 31 Transmission switcher 40 DC resistance measuring device 41 Switcher D Wall thickness w Piping

Claims (9)

A hybrid measuring device using an electromagnetic ultrasonic probe capable of measuring the amount of thinning and surface temperature of a pipe through which liquid flows and the temperature of the liquid,
Two electromagnetic ultrasonic probes having a magnet and a coil are arranged opposite to each other on the outer periphery of the pipe,
In the electromagnetic ultrasonic probe, the first coil and the second coil, each of which is a winding, are arranged in parallel with each other with the current inlet side facing the same side, and the current of the first coil Are laminated so that the inlet side or the outlet side of the second coil is positioned between the windings of the second coil,
The magnet is arranged with N poles and S poles alternately on the coil side at equal intervals between the windings of the second coil and at three locations on the current inlet side and outlet side of the coil sandwiching the magnet. Then, by arranging the magnetizing direction toward the direction of contacting and separating from the coil,
A longitudinal wave transceiver configured by the second coil and the magnets disposed at the three locations;
A transverse wave transmitter / receiver constituted by the first coil and magnets disposed between the windings of the second coil corresponding to the first coil and at two locations on the current exit side or the entrance side, respectively. A hybrid measurement apparatus using an electromagnetic ultrasonic probe, comprising:   The two electromagnetic ultrasonic probes are installed so as to be positioned below the surface of the liquid, and current wires for supplying current to the first coil and the second coil are connected to each other, and 2. The electromagnetic wave according to claim 1, wherein at least one of the first coil and the second coil is in contact with the pipe and is connected to a wiring of a resistance measuring device that measures a resistance value of the coil. A hybrid measurement device using an ultrasonic probe. The current wiring is connected to the electromagnetic ultrasonic probe as a composite cable together with the resistance measurement wiring for at least one of the first coil and the second coil to which the resistance measurement wiring is connected. ,
The resistance measuring device is a part of a measurement arithmetic device that calculates the surface temperature of the pipe,
The measurement operation device is provided so as to be able to calculate the temperature of the pipe from the resistance of the coil, and a transverse wave transmitted from the transverse wave transmitter / receiver of one of the electromagnetic ultrasonic probes is connected to the liquid of the pipe. By receiving the reflected wave reflected at the interface by the transverse wave transmitter / receiver of the one electromagnetic ultrasonic probe, the amount of thinning of the pipe at the position where the one electromagnetic ultrasonic probe is disposed can be reduced. The hybrid measurement apparatus using the electromagnetic ultrasonic probe according to claim 2, wherein the hybrid measurement apparatus is provided so as to be capable of calculation. The measurement calculation device is configured to convert a reflected wave, which is transmitted from the transverse wave transmitter / receiver of the other electromagnetic ultrasonic probe, at the interface with the liquid of the pipe to the other electromagnetic ultrasonic probe. By receiving at the transverse wave transmitter / receiver of the child, the thinning amount of the pipe at the position where the two electromagnetic ultrasonic probes are arranged is provided so as to be respectively calculated,
The longitudinal wave transmitter / receiver of the other electromagnetic ultrasonic probe is converted into the inner diameter of the pipe corrected by the thinning amount and the longitudinal wave transmitted from the longitudinal wave transmitter of one of the electromagnetic ultrasonic probes. The velocity of the longitudinal wave is obtained from the time until the signal is received, and the temperature of the liquid can be calculated from the relationship between the velocity of the longitudinal wave obtained in advance and the liquid temperature. A hybrid measurement apparatus using the electromagnetic ultrasonic probe according to claim 3. The measurement calculation device includes a time T _n and an (n + 1) th reflection from when the transverse wave transmitter / receiver transmits a transverse wave until the _nth reflected wave of the multiple reflection reflected at the interface between the pipe and the liquid is received. By the pulse echo method according to the following equation, which divides the time difference (T _{n + 1} −T _n ) from the time T _{n + 1} until the wave is received by a value twice the velocity v of the transverse wave based on the pipe temperature, The hybrid measurement apparatus using the electromagnetic ultrasonic probe according to claim 3 or 4, wherein a thickness D of the pipe is calculated.
D = (T _{n + 1} −T _n ) / 2v The measurement calculation device can calculate the thickness D of the pipe by an electromagnetic ultrasonic resonance method which is calculated according to the following equation using the resonance frequency f _n , the order n of the frequency and the velocity v of the transverse wave based on the pipe temperature. A hybrid measurement apparatus using the electromagnetic ultrasonic probe according to any one of claims 3 to 5, wherein D = n (v / 2f _n )   The coil constituting the longitudinal wave transmitter / receiver of the other electromagnetic ultrasonic probe includes a transverse wave transmitter / receiver of the other electromagnetic ultrasonic probe and a longitudinal wave transmitter / receiver of the one electromagnetic ultrasonic probe. The hybrid measurement apparatus using the electromagnetic ultrasonic probe according to any one of claims 4 to 6, wherein a wire diameter is smaller than that of a coil constituting the transverse wave transceiver.   7. The current wiring of the one electromagnetic ultrasonic probe and the other electromagnetic ultrasonic probe is connected to an ultrasonic generator via a transmission switching device. A hybrid measurement apparatus using the electromagnetic ultrasonic probe according to any one of the above.   Using the hybrid measurement device using the electromagnetic ultrasonic probe according to any one of claims 4 to 8, the direct current resistance of the coil in contact with the pipe is measured to determine the pipe temperature, By receiving the reflected wave of the transverse wave transmitted by the transverse wave transmitter / receiver of the one electromagnetic ultrasonic probe and the other electromagnetic ultrasonic probe, the thickness reduction of the pipe is obtained, and the one of the above The pipe obtained from the time until the longitudinal wave transmitter / receiver of the other electromagnetic ultrasonic probe receives the longitudinal wave transmitted from the longitudinal wave transmitter of the electromagnetic ultrasonic probe and the thinning amount A pipe inspection method, wherein the velocity of the longitudinal wave is calculated from the inner diameter of the liquid and the temperature of the liquid is obtained from the relationship between the velocity and the liquid temperature.

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