KR20240055368A - TDR Sensor, and Pipe-Attached Leak Detection System and Method Thereof - Google Patents

Abstract

The present invention relates to a pipe-attached water leak detection system that can accurately detect the location of water leaks in the pipe 10 by attaching a TDR sensor 100 with a twisted structure to the pipe 10. The twisted structure has increased elasticity and flexibility. When attaching the TDR sensor 100 having the structure to the pipe 10, it is attached longitudinally to the lower part of the horizontal pipe portion 11 of the pipe 10, and the curved pipe portion 12 and the vertical pipe portion of the pipe 10 It is attached in a spiral shape to (11), so that the attenuation and noise of the TDR sensor 100 are small even in a long pipe or pipe 10 including a curved pipe portion 12 or a vertical pipe portion 13, preventing water leakage in the pipe 10. You can accurately determine the location.

Description

TDR sensor, pipe-attached leak detection system and method including the same {TDR Sensor, and Pipe-Attached Leak Detection System and Method Thereof}

The present invention relates to a TDR sensor, a pipe-mounted water leak detection system and method including the same, and more specifically, to a TDR sensor with a new structure and a TDR sensor with a new structure that can accurately detect the presence or absence of leaks in the pipe and the location of the leak by attaching it to the pipe. It relates to a TDR sensor, a pipe-mounted water leak detection system and method having the same.

The TDR (Time Domain Reflectometry) technique was initially used mainly to detect local defects in electric wires, and has since been applied to various technical fields to identify distant locations and characteristics of objects using returned signals.

In general, a TDR sensor can deform a wave due to refraction or reflection in response to the progress of a specific wave input through a pair of conductors. It measures the degree of this deformation in the time domain to diagnose the overall condition of the conductor or It can be used to infer unique points on a conductor.

TDR sensor technology with these characteristics is an electromagnetic method that is economical and can monitor the status of objects over a wide range of objects, and has recently replaced the existing sonic method in the field of pipe leak detection technology.

However, the TDR sensor is equipped with two cables or measurement lines, but the spacing between the two measurement lines is not maintained uniformly or a lot of noise is generated due to deformation such as bending, which prevents accurate measurement. There is a problem.

To solve this problem, ‘TDR measurement line and TDR measurement system equipped with it’ (hereinafter referred to as ‘Prior Art 2’) is proposed in Domestic Patent Publication No. 10-1312072.

The TDR measurement line 100 shown in Prior Art 1 is arranged parallel to each other in a strip shape as shown in FIG. 1, and includes two conductor lines 110 through which electric pulses each flow; It is formed of an insulating covering member 120 that surrounds the two conductor wires 110 and fixes the two conductor wires 110 to be positioned parallel to each other, so that the spacing between the two conductor wires 110 is uniform. There are advantages to maintaining it.

However, prior art 1 is formed in a strip shape, so there still remains the problem that a lot of noise is generated when the TDR measurement line is bent or installed in a curved pipe part, etc.

Domestic Registered Patent No. 10-2187098 is an invention related to 'Heat transport pipe damage detection system and method using TDR measuring line' (hereinafter referred to as 'Prior art 2'), which is a technology for detecting damage to pipes using TDR technique. An example is given.

Prior art 2 includes a TDR device 120 electrically connected to the TDR measurement line 110, as shown in FIG. 1, and the TDR measurement line 110 is a heat transport pipe 130 that is subject to detection of damage. ) is formed in the form of a band of the same length as the length of the buried heat transportation pipe 130, and is installed at a position corresponding to the heat transportation pipe 130 throughout the entire length section of the buried heat transportation pipe 130, and the TDR device 120 is provided with a TDR measurement line 110 ) includes an electric pulse generator 122 that generates an electric pulse signal applied to the electric pulse signal, a signal detector 123 that detects a reflected signal of the electric pulse signal, and a control unit 121 that is electrically connected to the electric pulse generator and the signal detector. , the control unit 121 has the advantage of being able to check whether the heat transport pipe is damaged and the location of the damage based on the reflected signal of the electric pulse signal received from the signal detector 123.

However, in prior art 2, when the pipe is formed as a straight line and its length is short, such as the heat transportation pipe 130 shown in FIG. 2, the TDR measurement line 110 is installed at the top of the pipe to accurately detect leakage. However, when attaching it to a pipe, it is still difficult to install a TDR sensor if there are curved and/or vertical sections in the pipe, and even if a strip-shaped TDR sensor is installed, the signal shape is flat due to deformation such as bending. There is a problem in that it is difficult to determine whether there is a pipe leak.

In addition, since it is a system that additionally installs a separate TDR sensor at a certain distance from the heat transportation pipe, there is a problem that it is difficult to apply to pipes that are not buried.

In addition, when monitoring a wide range of objects with the existing TDR sensor, a lot of noise is generated in the elongated signal shape, making it difficult to visually observe the change in signal shape in case of water leakage, and real-time monitoring is also not easy.

Registered Patent No. 10-1312072 (announced on October 4, 2013) Registered Patent No. 10-2187098 (announced on December 4, 2020)

In order to solve the above problems, the present invention aims to provide a TDR sensor that has a flat signal with low attenuation and low noise even when installed in a long pipe or a pipe that is long or includes a curved pipe or a vertical section. do.

In addition, in the present invention, the pipe-mounted water leak detection system and method can accurately detect the location of water leak by attaching the TDR sensor to a pipe to have a flat signal shape even when installed in a pipe that is long or includes a curved pipe and a vertical portion. We would like to provide.

The TDR sensor according to the present invention includes a reference cable 110; and a cable 120 for measuring reflected waves, wherein the reference cable 110 and the cable 120 for measuring reflected waves include conductors 111 and 121, respectively; insulating covering members (112, 122); and moisture absorption members 113 and 123 are sequentially stacked, and the reference cable 110 and the reflected wave measurement cable 120 are twisted so that the distance between the two cables 110 and 120 is Not only does it remain constant, but it is also constructed to have elasticity and flexibility.

The pipe-mounted water leak detection system according to the present invention includes a pipe (10); The TDR sensor 100 attached to the pipe 10; A TDR measuring device 20 electrically connected to the reference cable 110 of the TDR sensor 100 and the cable 120 for measuring reflected waves; And a computer 30 with a built-in control unit 40 that operates the TDR measuring device 20, wherein the TDR sensor 100 is located at the bottom of the horizontal pipe portion 11 of the pipe 10 in the longitudinal direction. It is attached in a spiral shape to the curved pipe portion 12 and the vertical pipe portion 11 of the pipe.

In addition, the control unit 40 includes a TDR sensor spirally wound around the curved pipe portion 12 and the vertical pipe portion 13 when calculating the water leak location of the pipe 10 from the position measured by the TDR sensor 100. It is preferable that a compensation unit 41 that compensates for the difference in length of 100 is provided.

The pipe-mounted water leak detection method according to the present invention includes attaching the TDR sensor 100 to the pipe 10 (S100); A step of electrically connecting the TDR sensor 100 with the TDR meter 20 and the computer 30 with a built-in control unit 40 (S200); And a step (S300) of transmitting a pulse wave to the TDR meter 20 and then receiving a reflected wave to detect water leakage in the control unit 40. At this time, the step (S100) includes attaching the TDR sensor 100 in the longitudinal direction to the lower part of the horizontal pipe portion 11 of the pipe 10 (S110); And a step (S120) of attaching the TDR sensor 100 to the curved pipe portion 12 and the vertical pipe portion 11 of the pipe in a spiral manner, and the step (S300) is performed in the TDR measuring device 20. Transmitting a pulse wave to the TDR sensor 100 (S310); Receiving a reflected wave from the TDR sensor 100 at the TDR meter 20 (S320); The position of the TDR sensor 100 derived from the water leakage position in the compensation unit 41 of the control unit 40 is calculated by calculating the difference in length of the TDR sensor 100 spirally wound around the curved pipe portion 12 and the vertical pipe portion 13. Compensating step (S330); and a step (S340) of displaying the location of the water leak in the pipe 10 on the computer 30.

The pipe-mounted water leak detection system according to the present invention includes a TDR sensor 100 configured to have a twisted structure in which two strands, a reference cable 110 and a cable 120 for measuring reflected waves, constituting the TDR sensor 100, have a constant pitch. By installing it in a pipe, the reference cable 110 and the reflected wave measurement cable 120 that make up the TDR sensor 100 are always installed at the same distance and under the same environmental conditions, and the environmental conditions do not change even if the length becomes longer. It has the advantage of generating a flat signal whose signal shape is significantly different from existing TDR sensors, making it easy to identify signal changes due to water leakage.

The TDR sensor 100 according to the present invention has a structure in which the reference cable 110 and the cable 120 for measuring reflected waves are twisted together, so unlike the strip-shaped TDR sensor shown in Prior Art 1, it is elastic and flexible in various directions. Even if the piping increases and is bent or wrapped around the outer circumference of the pipe, there is little attenuation and deformation of the signal, which has the advantage of making it easier to process signals and determine the location of water leaks.

The pipe-mounted water leak detection system according to the present invention is provided with moisture absorption members 113 and 123 outside the reference cable 110 of the TDR sensor 100 and the cable 120 for measuring reflected waves, so that it can be used for piping on land that is not buried. It has the advantage of being able to accurately detect the location of water leaks.

In the pipe-mounted water leak detection system according to the present invention, the TDR sensor 100 is installed at the lower part of the horizontal pipe portion 11 of the pipe 10, and the curved pipe portion 12 and the vertical pipe portion 13 are installed in a spiral shape. 10) It has the advantage of being able to accurately detect its location no matter where a water leak occurs.

Figure 1. TDR measurement line having a strip-shaped structure shown in Prior Art 1.
Figure 2. Heat transport pipe damage detection system using the TDR measurement line shown in Prior Art 2.
Figure 3. Conceptual diagram of a pipe-mounted water leak detection system according to the present invention.
Figure 4. Leakage signal graph of the TDR sensor used in the present invention.
Figure 5. Structure of the TDR sensor 100 according to the present invention.
Figure 6. Change in signal shape compared to the twisted structure of the TDR sensor 100 according to the present invention.
Figure 7. Shows the signal shape according to the coating thickness of the sensor developed in the present invention.
Figure 8. Conceptual diagram of attaching a TDR sensor to the water leak detection system of the present invention.
Figure 9. Comparison of water leak detection signals using the TDR sensor of the present invention and the existing TDR sensor.
(a) Water leak detection graph using a twisted structure TDR sensor
(b) Water leak detection graph using the existing parallel structure TDR sensor
Figure 10. Flow chart of a water leak detection method using the water leak detection system of the present invention.
Figure 11. A detailed flowchart of the water leak detection step (S300) of the present invention.

Hereinafter, the present invention will be described with reference to the attached drawings. However, the present invention may be implemented in various different forms and, therefore, is not limited to the embodiments described herein.

Throughout the specification, when a part is said to be "connected (connected, contacted, combined)" with another part, this means not only "directly connected" but also "indirectly connected" with another member in between. "Includes cases where it is. Additionally, when a part is said to “include” a certain component, this does not mean that other components are excluded, but that other components can be added, unless specifically stated to the contrary.

Figure 3 is a conceptual diagram of a pipe-mounted water leak detection system according to the present invention.

The pipe-mounted water leak detection system of the present invention includes a pipe 10 connected to a liquid tank 50, as shown in FIG. 3; TDR sensor 100 attached to the pipe 10; TDR instrument (20); and a computer 30 including a control unit 40.

The pipe 10 of the present invention is not limited to buried pipes, but is intended for pipes 10 exposed on land or to the outside.

When a hole in the pipe 10 occurs due to corrosion, external shock, etc., the fluid leaks to the outside due to the pressure of the tank 50. The TDR technique can be used to determine whether the pipe is leaking.

Figure 3 shows a pipe 10 made up of a horizontal pipe section, but typical pipes are often long and include not only the horizontal pipe section 11 but also the curved pipe section 12 and the vertical pipe section 13. There are many, and the pipe joint 14 is usually formed as a flange joint with a protruding structure. The water leak detection system of the present invention is a water leak detection system that can be applied to such general pipes.

The computer 30 is generally configured to display and monitor signals, and is equipped with a control unit 40 that operates the TDR measuring instrument 20 and performs signal processing.

The TDR meter 20 is a device that transmits pulse waves and converts reflected waves in time units into impedance signals.

As shown in FIG. 3, when a water leak occurs at a point (P1) of the pipe 10, looking at the TDR meter signal as shown in FIG. 3, there is a difference from the signal when no water leak occurs in FIG. 4. You can see that

In Figure 4, the X-axis represents the round trip distance, and the Y-axis represents the impedance value.

The black line in Figure 4 is the signal obtained when the TDR sensor is installed in the air, and the red line is the signal obtained after dropping water on one position (P1) of the TDR sensor. From this, the impedance value at the location where the water leak occurred is It can be seen that it is decreasing.

Since this TDR sensor 100 is composed of a reference cable 110 and a cable 120 that returns by reflected waves, the X-axis represents a round-trip distance as shown in FIG. 4. Therefore, the leak location is calculated as half the round trip distance (one-way distance).

The present invention proposes a TDR sensor 100 with a new structure, which includes a reference cable 110 and a cable 120 for measuring reflected waves, as shown in FIG. 5. Since the two cables 110 and 120 must have the same impedance, it is preferable that they are made of the same shape and material.

The reference cable 110 and the cable 120 for measuring reflected waves of the present invention are sequentially combined with conductors 111 and 121 that transmit electromagnetic waves, insulating coating members 112 and 122, and moisture absorption members 113 and 123, respectively. The insulating coating members 112 and 122 are formed to surround the outside of the conductors 111 and 121, and the moisture absorption members 113 and 123 are formed to surround the insulating coating members 112 and 122. Consists of. [Figure 5] shows the shape of the TDR sensor developed in the present invention. The sensor is divided into a moisture-absorbing material [Figure 5-1], an insulating coating material made of insulating material surrounding the conductor [Figure 5-2], and a conductor through which electromagnetic waves are transmitted [Figure 5-3]. It is desirable to configure the length of the TDR sensor 100 to have a length set according to the monitoring target, such as a pipe. At this time, since the performance of the TDR meter 20 may affect the maximum length, it is desirable to install a suitable meter 20.

The moisture absorption members 113 and 123 are additionally configured to increase the accuracy of detection of the impedance value of the reflected object according to the reflected wave principle of the TDR sensor 100. The moisture absorption members 113 and 123 are preferably made of a material such as a sponge or quick-drying fiber that easily absorbs water leakage from the pipe 10 and dries quickly.

In the configuration of the TDR measurement line presented in Prior Art 1, the two cables 110 and 120 forming the sensor are formed parallel to each other to form a strip shape.

Prior art 1 has the advantage of maintaining the same spacing between the two cables 110 and 120 by forming them in a strip shape.

However, in prior art 1, the TDR measurement line is formed in a strip shape and has a specific direction, so there is no problem when attached to the horizontal pipe part of the pipe, but when installed in the curved pipe part, attenuation and noise occur due to the bending action. Problems that may increase arise. In addition, the TDR sensor can be installed vertically in the vertical pipe, but if a water leak occurs in the vertical pipe, liquid will flow down the length of the pipe, so if a water leak occurs on the side where the TDR sensor is not attached, it cannot be detected. There is a problem.

In addition, when the two cables 110 and 120 are parallel as in prior art 1, an insulating coating member and/or air (insulator) can be provided between the two conductors 111 and 121, which is similar to the capacitor structure. . A capacitor stores electricity and prevents current from flowing. Therefore, there may be a problem in which signals that should flow through the reference conductor and the return conductor may accumulate due to the capacitor structure, causing mutual interference.

In order to solve this problem, the inventor of the present invention configured the reference cable 110 of the TDR sensor 100 and the cable 120 for measuring the reflected wave to be twisted with each other, as shown in FIG. 5.

It is preferable that the conductors 111 and 121 of each cable 110 and 120 are composed of stranded wires rather than solid wires to facilitate twisting, and the number of wires and the size of the diameter in the stranded conductors are determined by the environment in which they are applied, such as seawater pipes and thermal fluid transport pipes. It can be set according to .

When the two cables (110, 120) are configured in a twisted structure like this, a slight bending phenomenon occurs at the twisted portion, but the two cables (110, 120) have the same structure over the entire length and can maintain the same spacing, thereby reducing noise. By significantly reducing it, a flat signal can be formed in the longitudinal direction.

When the two cables 110 and 120 are twisted together, they function as inductors. The inductor's role is to prevent sudden changes in current by resisting changes in current. Therefore, this prevents the influence of external current changes (noise), so the signal appears flat. Since this is similar to a coil, the amount of energy (force) that prevents the influence of noise varies depending on the number of twists per unit length, so it is necessary to set the number of twists appropriately.

The twist structure of the two cables 110 and 120 affects the signal shape of the sensor as shown in FIG. 6.

Looking at FIG. 6, when two cables are parallel, the signal is accumulated in a capacitor structure, and the signal of the returning reflected wave is reduced. Accordingly, the impedance value gradually increases and the graph gradually rises upward.

On the other hand, Figure 6 shows that when the number of times the two cables (110, 120) are twisted is increased with 50cm set as the unit length (L), the force that prevents external current changes becomes stronger due to the role of the inductor, resulting in a flat surface without noise. A signal appears. However, if the number of twists is more than 5, the power to block noise is sufficient, so even if the number of twists is increased, the signal does not change significantly.

In Figure 6, the diameter (d) of the conductors (111, 121) is 0.98 m, which is about 1 cm, so it can be seen that the number of twists is sufficient if it is 1/10 of the unit length (L) of the cable / conductor diameter (d). there is.

Meanwhile, the insulating covering members 112 and 122 are components to prevent interference with signals reflected and returned from the cable-type TDR sensor, and any insulating material such as PVC is sufficient.

The TDR sensor 100 of the present invention is used by being directly attached to a pipe, and since the two cables 110 and 120 are formed in a twisted state, the thickness of the insulating covering members 112 and 122 may affect the signal, The thickness of the insulating covering members 112 and 122 is preferably determined so that the two cables 110 and 120 do not interfere with each other.

As shown in FIG. 7, if the thickness of the insulating covering members 112 and 122 is thin, the two conductors 111 and 121 may interfere and the impedance may decrease, and the thickness of the insulating covering members 112 and 122 may decrease. If it is excessively thick, the impedance value increases, but because the shielding effect is excessively formed, the change in impedance value due to water is minimal, making it difficult to determine whether there is a water leak.

In the present invention, the diameter (d) of the conductors (111, 121) is 0.98 mm, which is about 1 cm, and the thickness of the insulating coating members (112, 122) is suitable to be between about 0.8 mm and 1.2 mm, so the insulating coating members (112, 122) It is appropriate to set the thickness of (112, 122) in the range of 80% to 120% of the diameter (d) of the conductors (111, 121).

As such, the TDR sensor 100 of the present invention, which has a twisted structure shown in FIG. 5, has increased elasticity compared to the existing strip-shaped TDR measurement line as shown in Prior Art 1 due to its structural characteristics and can be used in various directions. Because flexibility also increases, in the pipe-mounted water leak detection system of the present invention, as shown in FIG. 8, the TDR sensor 100 is measured, installed on the bend part 12 and the flange part of the pipe, or connected to the bend part 12. Even if the signal is measured by wrapping it around the outer peripheral surface of the vertical pipe portion 13, there is an advantage in that the signal can be measured without significant signal attenuation and noise.

The pipe-mounted water leak detection system shown in Figure 8 is as follows.

In the horizontal pipe portion 11 of the pipe 10, the TDR sensor 100 is installed at the lower part of the pipe. Liquid leaking from the pipe moves to the lower part of the pipe by gravity and then falls, so if it is installed at the lower part of the pipe (10) (6 o'clock direction), leakage can be effectively detected.

If there is an obstacle such as the flange 14 of the pipe 10, it is installed by attaching it according to the shape of the obstacle.

The TDR sensor 100 is installed in the curved pipe portion 12 and the vertical pipe portion 13 of the pipe 10 while spirally surrounding the surface of the pipe.

When there is a leak from the curved pipe part 12 and the vertical pipe part 13, the liquid falls due to gravity, so if it is installed with the outer peripheral surface wrapped in a spiral shape, leaks in all directions can be detected.

When installed in a spiral, the pitch of the spiral can be set according to the environment in which the pipe is applied. In the future, it will be easier and easier to determine the exact location of the TDR sensor 100 and the exact leakage location of the pipe 10 in the compensator 41. In order to accurately determine it, it would be desirable to form it into a spiral shape with the same pitch.

In this way, when installing the TDR sensor 100 on the surface of the pipe, fixing it using adhesive or an insulating cable tie will enable more stable measurement and monitoring.

Figure 9a shows a signal for detecting leakage and location of a pipe using the TDR sensor 100 having a twisted structure of the present invention. Various leakage locations can be clearly identified from the measured signal.

Figure 9b is a signal measured when a TDR sensor having a conventional strip shape rather than a twisted structure as shown in prior art 1 is installed as shown in Figure 8, but the signal itself is uneven and it is unclear whether it is a leakage signal. Therefore, it can be seen that it is difficult to accurately identify the presence and location of a leak.

In this way, it can be seen that the pipe-mounted water leak detection system according to the present invention is significantly effective in identifying the location of the leak, unlike existing systems.

A method of detecting a water leak in a pipe using the pipe-mounted water leak detection system of the present invention having the above configuration is as follows.

The pipe-mounted water leak detection method of the present invention includes the step of attaching the TDR sensor 100 to the pipe 10 as shown in FIG. 10 (S100); A step of electrically connecting the TDR sensor 100 with the TDR meter 20 and the computer 30 with a built-in control unit 40 (S200); And a step (S300) of transmitting a pulse wave to the TDR meter 20 and then receiving a reflected wave to detect water leakage in the control unit 40.

In the step (S100) of attaching the TDR sensor 100 to the pipe 10, the TDR sensor 100 prepares a TDR sensor 100 having a twisted structure, and the horizontal pipe portion 11 of the pipe 10 The TDR sensor 100 is attached to its lower part in the longitudinal direction, and the curved pipe part 12 and the vertical pipe part 11 of the pipe are attached by winding the TDR sensor 100 in a spiral shape on its surface.

When there are multiple spirals, it would be desirable to wind the TDR sensor 100 to have the same pitch so that the position of the pipe can be accurately matched from the position of the TDR sensor 100.

The step (S300) of transmitting a pulse wave to the TDR meter 20 and then receiving a reflected wave to detect water leakage in the control unit 40 (S300) is a step (S300) of detecting water leakage in the TDR meter 20, as shown in FIG. Transmitting a pulse wave to the sensor 100 (S310); Receiving a reflected wave from the TDR sensor 100 at the TDR meter 20 (S320); The position of the TDR sensor 100 derived from the water leakage position in the compensation unit 41 of the control unit 40 is calculated by calculating the difference in length of the TDR sensor 100 spirally wound around the curved pipe portion 12 and the vertical pipe portion 13. Compensating step (S330); and a step (S340) of displaying the location of the water leak in the pipe 10 on the computer 30.

The position of the TDR sensor 100 derived from the water leakage position in the compensation unit 41 of the control unit 40 is calculated by calculating the difference in length of the TDR sensor 100 spirally wound around the curved pipe portion 12 and the vertical pipe portion 13. The compensating step (S330) represents a step of converting or compensating for the signal detected by the leakage position to the length or position of the TDR sensor 100 to the length or position of the pipe 10.

By installing the TDR sensor 100 by winding it in a spiral shape on the curved pipe part 12 and the vertical pipe part 13, the length of the TDR sensor 100 and the length of the pipe are not the same at the leakage location of the pipe, and the TDR sensor 100 The length of may be longer. The length of the spirally wound TDR sensor 100 can be matched to the length of the pipe using the pipe diameter (D) and the spiral pitch (p), and using this, the leak location of the pipe 100 can be accurately indicated. there is.

Next, the step of displaying the location of the water leak in the pipe 10 on the computer 30 (S340) is a step of displaying the location of the water leak in the pipe 10 on the computer's monitor or displaying it with a number. Additionally, this step can be used to monitor pipe leaks.

Through the method described above, it is possible to accurately identify leakage and location of leaks even for pipes of various shapes and/or pipes that are not buried, and continuous monitoring is also possible.

The scope of the present invention is indicated by the patent claims described below, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention.

10: Piping 11: Horizontal pipe part 12: Bend pipe part
13: Vertical pipe 14: Pipe joint 20: TDR measuring instrument
30: computer 40: control unit 41: compensation unit
50: Tank 100: TDR sensor 110: Reference cable
111: Conductor 12: Insulating coating member 113: Moisture absorption member
120: Cable for measuring reflected waves 121: Conductor
122: insulating covering member 113: moisture absorption member
L: Unit length of cable d: Diameter of conductor

Claims (4)

reference cable 110; In the TDR sensor including a cable 120 for measuring reflected waves,
The reference cable 110 and the reflected wave measurement cable 120 each include conductors 111 and 121; insulating covering members (112, 122); and moisture absorption members 113 and 123 are sequentially stacked,
The reference cable 110 and the reflected wave measurement cable 120 are formed in a twisted structure,
A TDR sensor characterized by not only maintaining a constant distance between the two cables (110, 120) but also having elasticity and flexibility.
piping (10);
The TDR sensor (100) of claim 1 attached to the pipe (10);
A TDR measuring device (20) electrically connected to the reference cable (110) of the TDR sensor (100) and the cable (120) for measuring reflected waves; and
It includes a computer 30 with a built-in control unit 40 that operates the TDR measuring instrument 20,
The TDR sensor 100 is
The horizontal pipe portion 11 of the pipe 10 is attached in the longitudinal direction at the bottom.
A pipe-attached water leak detection system, characterized in that it is spirally attached to the curved pipe portion 12 and the vertical pipe portion 11 of the pipe.
According to paragraph 2,
In the control unit 40,
When calculating the water leak location of the pipe 10 from the position measured by the TDR sensor 100, the difference in length of the TDR sensor 100 spirally wound around the curved pipe portion 12 and the vertical pipe portion 13 is compensated for. A pipe-mounted water leak detection system, characterized in that it is provided with a compensation unit (41).
Attaching the TDR sensor 100 shown in claim 1 to the pipe 10 (S100);
A step of electrically connecting the TDR sensor 100 with the TDR meter 20 and the computer 30 with a built-in control unit 40 (S200); and
It includes a step (S300) of transmitting a pulse wave to the TDR meter 20, receiving a reflected wave, and detecting water leakage in the control unit 40,
The S100 step is,
Attaching the TDR sensor 100 in the longitudinal direction to the lower part of the horizontal pipe portion 11 of the pipe 10 (S110); and
It includes a step (S120) of attaching the TDR sensor 100 in a spiral manner to the curved pipe portion 12 and the vertical pipe portion 11 of the pipe,
The S300 step is,
Transmitting a pulse wave from the TDR meter 20 to the TDR sensor 100 (S310);
Receiving a reflected wave from the TDR sensor 100 at the TDR meter 20 (S320);
The position of the TDR sensor 100 derived from the water leakage position in the compensation unit 41 of the control unit 40 is calculated by calculating the difference in length of the TDR sensor 100 spirally wound around the curved pipe portion 12 and the vertical pipe portion 13. Compensating step (S330); and
A pipe-mounted water leak detection method comprising a step (S340) of displaying the water leak location of the pipe 10 on the computer 30.

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