Receiving device and detecting device

Abstract

To provide a receiving device and a detecting device that enable an operator to efficiently detect a coating damage part of an underground buried object.SOLUTION: There is provided a receiving device that has a wheel electrode which moves along an underground buried object, having a corrosion protective coating on its external surface, on the ground surface right above the underground buried object to detect the potential difference of the ground surface, and the receiving device comprises a display device which displays information related to the potential difference of the ground surface detected by the wheel electrode, wherein the display device displays, on one screen, a real-time data display part which displays real-time information on a phase value and an amplitude value in the information and a chart display part which displays information on a history as to the phase value, the amplitude value, and the movement distance of the receiving device in the form of a waveform chart.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to a receiving device and a detecting device. [Background technology]

[0002] A technology has been disclosed for detecting, from above ground, the presence and location of damaged parts of the anticorrosion coating (hereinafter referred to as "damaged parts") of an underground buried object whose outer surface is coated with an anticorrosion coating. Patent Document 1 discloses a detection device that displays on a display device the earth surface potential difference detected by a receiving device, and detects the presence and location of the damaged part from the waveform.

[0003] In this type of detection device, for example, as shown in Fig. 7, a worker (operator O) may move a receiving device 200' along an underground buried object to detect the earth surface potential difference and confirm the location of the damaged part. Fig. 7 is a schematic diagram showing an example of conventional detection of the earth surface potential difference by an operator O.

[0004] Here, the operator O checks the location of the damaged part and whether or not there is a damaged part by looking at two screens, screen α and screen β, shown in FIG. A waveform chart of historical data of the phase and amplitude of the earth surface potential difference is displayed on the screen α. The screen α is a screen on a PC. Screen β displays real-time data of changes in the phase or amplitude of the earth's surface potential difference calculated by the lock-in amplifier. Operator O confirms the location of the damage to the underground buried object based on the data displayed on screen β and marks the location of the damage on the ground surface. Operator O determines whether or not a damaged area is definitely present at the location of the damage to the underground buried object confirmed based on the data displayed on screen β based on changes in the waveform chart on screen α. In detail, after confirming the location of the damage and the possibility of the presence or absence of a damaged area based on the data displayed on screen β, when a change in the waveform chart that would be displayed if damage is present is displayed on screen α, operator O confirms that a damaged area definitely exists in the underground buried object. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 63-191049 Summary of the Invention [Problem to be solved by the invention]

[0006] However, when the operator O checks the location of the damaged part and whether or not there is a damaged part based on the data displayed on the two screens, the screen α and the screen β, the following problem occurs. Screen β always displays real-time data on changes in the phase or amplitude of the Earth's potential difference. On the other hand, the waveform chart displayed on screen α is not displayed in real time. That is, the waveform chart displayed on screen α is displayed slightly later than the real-time data displayed on screen β. For this reason, for example, if operator O is moving the receiving device while looking only at screen α, he or she may notice the occurrence of a damaged area after passing the actual damaged area a short distance away. In this case, operator O, who is looking only at screen α, may miss the phase change of the Earth's potential difference displayed on screen β, causing operator O to forget to mark the Earth's surface. If operator O forgets to mark the Earth's surface, operator O must return the receiving device to the position where the marking is to be made, stop acquiring the waveform chart on screen α, and reacquire the changes in the phase or amplitude of the Earth's potential difference displayed on screen β. Therefore, the receiving device must be idled. Furthermore, for example, even if operator O can confirm changes in the phase or amplitude of the Earth's potential difference on screen β, the waveform chart displayed on screen α may be over-range. When the waveform chart displayed on screen α is over-range, operator O needs to change the range of the waveform chart. However, operator O may not be able to change the range of the waveform chart in a timely manner, resulting in an inaccurate waveform chart. In this case, operator O must return the receiving device and stop the lock-in amplifier from calculating changes in the phase or amplitude of the Earth's potential difference, and then re-acquire the waveform chart displayed on screen α. Furthermore, in addition to checking the data displayed on the two screens, the operator O must also operate an input device provided on the receiving device located on or near the two screens. Therefore, since the operator O must operate two operating locations (screens or input devices), this takes a lot of time and effort, which may result in a decrease in work efficiency.

[0007] An object of the present disclosure is to provide a receiving device and a detecting device that allow an operator to efficiently detect damaged portions of the coating of an underground buried object. [Means for solving the problem]

[0008] The present disclosure has been made to solve the above problems, and proposes the following means. A receiving device having wheel electrodes that detects the potential difference on the ground surface by moving along an underground buried object on the ground surface directly above the underground buried object whose outer surface is coated with a corrosion-resistant coating, and is equipped with a display device that displays information about the potential difference on the ground surface detected by the wheel electrodes, and the display device displays on a single screen: a real-time data display section that displays real-time information about phase values ​​and amplitude values, and a chart display section that displays historical information about phase values, amplitude values, and the distance traveled by the receiving device as a waveform chart. [Effects of the Invention]

[0009] According to the present disclosure, a receiving device and a detecting device can be provided that allow an operator to efficiently detect damaged portions of the coating of an underground buried object. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic diagram of a detection device according to an embodiment of the present disclosure. [Figure 2] FIG. 10 is a diagram showing an example of a waveform output by a lock-in amplifier. [Figure 3] FIG. 10 is a diagram showing an example of the waveform of the integrated value of the sine of the amplitude of a signal integrated by an integration device. [Figure 4] FIG. 10 is a schematic diagram showing how an operator detects the presence and location of a damaged area based on information displayed on a display device. [Figure 5] FIG. 1 is a schematic diagram of a display device. [Figure 6] 1 shows a schematic diagram of a display device when the phase meter is a circular meter. [Figure 7] FIG. 1 is a schematic diagram showing an example of conventional detection of earth surface potential difference by an operator. DETAILED DESCRIPTION OF THE INVENTION

[0011] A detection device 1000 and a detection method according to an embodiment of the present disclosure will be described below with reference to the drawings. The detection device 1000 according to this embodiment detects the position of a damaged portion Bs in an underground buried object B having an outer surface coated with a corrosion-resistant coating. In detail, an operator O moves a receiving device 200 along the underground buried object B on the ground surface above the underground buried object B, and detects the potential difference on the ground surface as a detection signal using a wheel electrode 210 provided in the receiving device 200. The underground buried object B may be, for example, a buried pipe or a metal pipe such as a steel pipe. As shown in Fig. 1, the detection device 1000 includes a measurement signal transmitter 100 and a receiving device 200. Fig. 1 is a schematic diagram of the detection device 1000.

[0012] An outline of the detection of the potential difference on the ground surface by the detection device 1000 will be described below. First, a measurement signal transmitter 100 (described later) passes an AC signal current between an underground buried object B and a counter electrode 120 (described later) to generate a potential difference. Next, the wheel electrode 210 detects the potential difference along the underground buried object B as a detection signal. The detection signal is then input to a signal processing device 300 and processed. The signal processed by the signal processing device 300 is displayed on a display device 400.

[0013] 1, the measurement signal transmitter 100 is a device for generating a potential difference at the position of a damaged portion Bs of an underground buried object B. The measurement signal transmitter 100 includes a counter electrode 120 placed underground (inside the soil). The measurement signal transmitter 100 is connected to the underground buried object B and the counter electrode 120. The measurement signal transmitter 100 applies an AC voltage between the underground buried object B and the counter electrode 120 to pass an AC current. Therefore, if a damaged portion Bs exists in the underground buried object B, a current I flows into the underground buried object B through the damaged portion Bs. Therefore, a potential difference occurs around the damaged portion Bs.

[0014] The receiving device 200 detects the ground surface potential difference directly above the buried object B. The receiving device 200 includes a wheel electrode 210, a signal processing device 300, a range switch 320, an integrating device 330, and a display device 400. Furthermore, the receiving device 200 includes a reference signal generator (not shown).

[0015] The wheel electrode 210 moves along the buried object B on the ground surface directly above the buried object B, and continuously detects the potential difference on the ground surface. As shown in FIG. 1, two wheel electrodes 210 are provided in the receiving device 200. Therefore, the ground surface potential difference is the potential difference between the potential detected by one wheel electrode 210 and the potential detected by the other wheel electrode 210. The wheel electrode 210 is connected to the signal processing device 300. The wheel electrode 210 outputs the potential difference on the ground surface to the signal processing device 300 as a detection signal. The wheels of the wheel electrode 210 are preferably made of, for example, conductive sponge rubber wheels.

[0016] A rotation signal generator such as an encoder (not shown) is provided on the wheel of the wheel electrode 210. The encoder (not shown) sends a signal related to the amount of wheel rotation of the wheel electrode 210 to, for example, a display device 400. The display device 400 converts the signal into a travel distance, which is then displayed on the display device 400. The display device 400 may calculate the travel time of the wheel electrode 210 based on the travel distance measured by, for example, an encoder (not shown) and the speed (speed of the operator O) at which the wheel electrode 210 travels along the underground buried object B. The travel time of the wheel electrode 210 may be calculated by, for example, a clock built into the display device 400.

[0017] The signal processing device 300 processes the signal output from the wheel electrode 210. The signal processing device 300 inputs the processed signal to the display device 400.

[0018] The signal processing device 300 may be, for example, a lock-in amplifier. A lock-in amplifier is a device that measures parameters such as the amplitude and phase of an AC signal. The lock-in amplifier in this embodiment measures the parameters of the signal based on the signal output from the wheel electrode 210. As shown in FIG. 1, the lock-in amplifier outputs the amplitude A of the signal to the range switcher 320 and the integrating device 330 , and outputs the phase φ to the integrating device 330 and the display device 400 .

[0019] There is no particular limitation on the number of lock-in amplifiers in the signal processing device 300. For example, the signal processing device 300 may include one lock-in amplifier or two lock-in amplifiers. When the signal processing device 300 includes two lock-in amplifiers, signals are output from the wheel electrodes 210 to the two lock-in amplifiers, respectively.

[0020] A reference signal generator (not shown) is connected to the lock-in amplifier. A reference signal is input to the lock-in amplifier by the reference signal generator (not shown). The reference signal is a frequency signal whose relative phase change with the AC signal current output by the measurement signal generator 100 is the same as that of the AC signal current output by the measurement signal generator 100 within a range of at least 180 degrees / hour.

[0021] The lock-in amplifier measures the following parameters from the processed signal, as shown in Figure 2: Waveform W1 of signal amplitude A [Figure 2(a)] Waveform W2 of Acosφ [Figure 2(b)] ·Waveform W3 of Asinφ [Fig. 2(c)] Waveform W4 of phase φ [Figure 2(d)] Figure 2 shows an example of the waveform of a parameter measured from a signal processed by a lock-in amplifier. The horizontal axis in Figures 2(a) to (d) indicates the distance from the damaged area Bs, with the damaged area Bs as the origin. The vertical axis in Figures 2(a), (b), and (c) indicates the potential difference (mV) of the signal, and the vertical axis in Figure 2(d) indicates the value of the signal phase φ.

[0022] Figure 2(a) shows that the potential difference is at a minimum at the origin, i.e., the position of the damaged area Bs. Figures 2(b) and 2(c) show that the sign of the potential difference is reversed at the position of the damaged area Bs. Figure 2(d) shows that the phase φ is reversed at the position of the damaged area Bs.

[0023] The range switcher 320 switches the maximum amplitude (full-scale value) of the signal amplitude A (mV or V) to be displayed by the display device 400. The range switcher 320 preferably selects a range in which the signal amplitude A is as close as possible to the upper limit of the display range of the display device 400. Specifically, after switching to an appropriate range, the range switcher 320 converts the signal amplitude A into a percentage amplitude %A (the ratio of the amplitude A to the full-scale value), as shown in FIG. 1 . The range switcher 320 then outputs the percentage amplitude %A to the display device 400.

[0024] The integrating device 330 integrates the sine of the amplitude of the signal A sin φ or the cosine of the amplitude A cos φ, i.e., the potential difference distribution on the Earth's surface, based on the phase φ and amplitude A output from the lock-in amplifier. The integrating device 330 outputs the integrated value ΣA sin φ or ΣA cos φ of the sine of the amplitude of the signal A sin φ or the cosine of the amplitude A cos φ to the display device 400. Fig. 3 shows an example of the waveform of the integrated value ΣA sin φ of the sine A sin φ of the signal amplitude integrated by the integration device 330. The horizontal axis in Fig. 3 indicates the distance from the damaged area Bs, with the damaged area Bs as the origin, as in the horizontal axis in Fig. 2. As shown in Fig. 3, ΣA sin φ has a maximum value at the position of the damaged area Bs.

[0025] 1, the display device 400 displays various signals output from the signal processing device 300, the range switcher 320, and the integrating device 330. For example, the display device 400 displays the integrated waveform (ΣA sin φ) of the potential difference distribution, the phase φ output from the lock-in amplifier, and the amplitude A output from the range switcher 320. The display device 400 may be configured using an information device (information processing device) such as a smartphone, tablet, personal computer, dedicated device, or server device. The display device 400 may include, for example, a known display. For example, the display device 400 includes displays such as a CRT (Cathode Ray Tube) display, a liquid crystal display, or an organic EL (Electro-Luminescence) display. For example, the display device 400 may be a display included in a known PC. In this case, the functions of the above-mentioned integrating device 330 may be ensured by executing a program using a processor such as a CPU (Central Processing Unit) and memory included in the PC. For example, the display device 400 may be a pen recorder such as a known balance recorder. The display device 400 may be a so-called touch panel. The display screen of the display device 400 may also serve as an input unit.

[0026] 4, the operator O detects the presence or absence and position of a damaged part Bs in the underground buried object B based on the information displayed on the display device 400. FIG. 4 is a schematic diagram showing how the operator O detects the presence or absence and position of a damaged part Bs based on the information displayed on the display device 400. As shown in Fig. 7, in a conventional detection device, the operator O needs to detect the presence and location of the damaged area Bs while looking at two screens. On the other hand, as shown in Fig. 4, in the detection device 1000 according to this embodiment, the operator O can detect the presence and location of the damaged area Bs based on information displayed on a single screen of the display device 400. This makes it possible to reduce the occurrence of forgetting to mark the ground surface, mistakes in switching the range, and the like, as described above. Furthermore, with conventional receiving devices, the operator O had to check the data displayed on the two screens and also operate an input device provided on the receiving device located on or near the two screens. Therefore, the operator O had to operate two operation locations (screens or input devices), which was time-consuming and could reduce work efficiency. On the other hand, with the detection device 1000 according to this embodiment, the operator O can operate the receiving device 200 based on information displayed on a single screen. Therefore, the operator O's time and effort can be reduced and work efficiency can be improved.

[0027] As shown in Fig. 5, the display device 400 includes a real-time data display unit 410 and a chart display unit 430. Fig. 5 is a schematic diagram of a display screen displayed by the display device 400. In the example shown in the figure, the real-time data display unit 410 is located at the top of the display screen, and the chart display unit 430 is located at the bottom of the display screen, but the positional relationship is not limited to this. The real-time data display unit 410 displays real-time information about the phase value and amplitude value. Specifically, the real-time data display unit 410 displays the real-time phase φ output from the lock-in amplifier and the real-time percent amplitude %A output from the range switch 320. Therefore, the operator O can determine the location of the corrosion protective coating damage in real time based on the information displayed by the real-time data display unit 410. The operator O then makes a mark on the ground surface directly above the location where the corrosion protective coating damage is suspected to have occurred. Here, "real time" means that processed information is output immediately (output substantially without a time lag). Therefore, the lock-in amplifier immediately outputs the phase φ to the real-time data display unit 410, and the range switcher 320 immediately outputs the percent amplitude %A to the real-time data display unit 410.

[0028] The real-time data display unit 410 includes a synchronization failure display unit 411, a communication abnormality display unit 412, a phase meter display unit 413, a phase adjustment button 414, an initial setting button 415, a lock button 416, an amplitude range display unit 417, an amplitude meter display unit 418, an amplitude range setting button 419, and an overvoltage display unit 420.

[0029] 5, the real-time data display unit 410 includes two of each of a synchronization failure display unit 411, a phase meter display unit 413, a phase adjustment button 414, an initial setting button 415, a lock button 416, an amplitude range display unit 417, an amplitude meter display unit 418, and an amplitude range setting button 419. Below, the elements from the synchronization failure display unit 411 to the amplitude range setting button 419 (excluding the communication abnormality display unit 412, the same applies below) will be described as a set of elements. One set from the synchronization failure display unit 411 to the amplitude range setting button 419 is located to the right of the other set. Furthermore, each set corresponds to two lock-in amplifiers provided in the signal processing device 300. Therefore, information output from each lock-in amplifier is displayed via each set provided in the real-time data display unit 410. The following description will be given assuming that the signal processing device 300 is provided with two lock-in amplifiers.

[0030] The synchronization failure display unit 411 displays whether or not the information displayed by the real-time data display unit 410 is synchronized with the parameters actually measured by the lock-in amplifier. For example, the synchronization failure display unit 411 displays nothing while the synchronization is successful, and lights up when the synchronization fails, allowing the operator O to detect that the synchronization has failed.

[0031] The communication error display unit 412 displays whether or not communication between the display device 400 and the lock-in amplifier is normal. For example, the communication error display unit 412 displays nothing while the communication is normal, and lights up when the communication is not normal.

[0032] The phase meter display unit 413 displays the real-time phase φ output from the lock-in amplifier. The phase meter display unit 413 includes a phase meter 413a and a needle 413b. 5, the range in which phase meter 413a can display phase φ is 360 degrees, from −180 degrees to +180 degrees, with the center of the meter being 0 degrees. The needle 413b indicates the real-time value of the phase φ within the range. The operator O identifies the position of the damaged area Bs by checking the change in the needle 413b. For example, when the wheel electrode 210 passes over the damaged area Bs, the needle 413b swings from the right to the left with 0 degrees on the phase meter 413a as the center value. By checking that the needle 413b has swung from the right to the left, the operator O can identify the position of the damaged area Bs. Therefore, the operator O can easily determine whether the wheel electrode 210 has passed over the damaged area Bs.

[0033] The phase adjustment buttons 414 have a function of adjusting the real-time value of the phase φ displayed by the phase meter display unit 413. The phase adjustment buttons 414 include a first phase decrease button 414a, a second phase decrease button 414b, a first phase increase button 414c, and a second phase increase button 414d. The operator O adjusts the real-time value of the phase φ displayed by the phase meter display unit 413 by pressing each button.

[0034] The first phase decrease button 414a and the second phase decrease button 414b are located to the left of the first phase increase button 414c and the second phase increase button 414d, so that the operator O can easily determine which button to press when adjusting the value of the phase φ.

[0035] The first phase decrease button 414 a and the second phase decrease button 414 b have the function of decreasing the real-time value of the phase φ displayed on the phase meter display section 413 . The first phase decrease button 414a and the second phase decrease button 414b each have an arrow pointing to the left. As shown in Fig. 5, the shapes of the arrows on the first phase decrease button 414a and the second phase decrease button 414b are different from each other. This allows the operator O to intuitively adjust the amount of decrease in the phase φ.

[0036] The amount of decrease in phase φ caused by the second phase decrease button 414b is greater than the amount of decrease in phase φ caused by the first phase decrease button 414a. For example, the amount of decrease in phase φ caused by the first phase decrease button 414a is 1 degree, and the amount of decrease in phase φ caused by the second phase decrease button 414b is 30 degrees.

[0037] The first phase increment button 414 c and the second phase increment button 414 d increase the real-time phase φ value displayed on the phase meter display 413 . The first phase increase button 414c and the second phase increase button 414d each have an arrow pointing to the right. As shown in Fig. 5, the shapes of the arrows on the first phase increase button 414c and the second phase increase button 414d are different from each other. This allows the operator O to intuitively adjust the amount of increase in the phase φ.

[0038] The second phase increase button 414d increases the phase φ by a larger amount than the first phase increase button 414c increases the phase φ by 1 degree, for example, and the second phase increase button 414d increases the phase φ by 30 degrees.

[0039] As described above, the first phase decrease button 414a and the second phase decrease button 414b each have an arrow pointing to the left, and the first phase increase button 414c and the second phase increase button 414d each have an arrow pointing to the right. Therefore, the operator O can easily understand the phase φ adjustment function of each button.

[0040] The initial setting button 415 has a function of initializing the real-time phase φ output from the lock-in amplifier. Specifically, when the operator O presses the initial setting button 415, the value of the real-time phase φ is set to the 90-degree position on the meter. In conventional receiving devices, the initial setting of the value of the phase φ is performed by the operator O operating a rotary knob or the like and visually adjusting the value so that it is at a 90-degree position. On the other hand, in the receiving device 200 according to this embodiment, the operator O can perform the initial setting of the value of the phase φ by pressing the initial setting button 415. Therefore, the operator O can more easily perform the initial setting of the value of the phase φ.

[0041] The lock button 416 has a function of preventing the value of the phase φ displayed in the phase meter display unit 413 from being changed even when the phase adjustment button 414 and the initial setting button 415 are pressed. The lock button 416 has two modes: a lock mode and an unlock mode. When the lock button 416 is in the lock mode, the value of the phase φ displayed in the phase meter display unit 413 does not change even when the phase adjustment button 414 and the initial setting button 415 are pressed. Therefore, even if the operator O presses the phase adjustment button 414 or the initial setting button 415 by mistake, it is possible to prevent the value of the phase φ displayed in the phase meter display unit 413 from being unintentionally changed. When the lock button 416 is in the unlock mode, the value of the phase φ is changed and adjusted by the operator O by pressing the phase adjustment button 414 or the initial setting button 415 . When the lock button 416 is in the lock mode, the lock button 416 emits light, for example, in green. When the lock button 416 is in the unlock mode, the lock button 416 emits light, for example, in gray. In this way, the display mode of the lock button 416 may differ depending on the mode.

[0042] The amplitude range display section 417 displays the full-scale value of the amplitude A in real time. The amplitude range display section 417 includes a full-scale value stacked bar section 417a and a full-scale value numeric display section 417b. 5, the full-scale value stacked bar section 417a displays the full-scale value as a stacked bar. Therefore, a change in the full-scale value of the amplitude A in real time is expressed by the expansion and contraction of the stacked bar. Therefore, the operator O can intuitively grasp the full-scale value. 5, the full-scale value numeric display section 417b displays the full-scale value as a numeric value. The full-scale value numeric display section 417b is disposed, for example, below the full-scale value stacked bar section 417a. Therefore, the operator O can visually recognize both the full-scale value stacked bar section 417a and the full-scale value numeric display section 417b. This makes it possible to prevent the operator O from mistaking the full-scale value.

[0043] The amplitude meter display 418 displays the real-time percentage of the amplitude A relative to the full-scale value. That is, it displays the real-time percentage amplitude %A. Specifically, the amplitude meter display 418 displays the real-time percentage amplitude %A as a stacked bar. Therefore, changes in the real-time percentage amplitude %A are represented by expansion and contraction of the stacked bar. This allows the operator O to intuitively confirm changes in the real-time percentage amplitude %A. The colors of the stacked bars of the two amplitude meter display units 418 (amplitude meter display units 418 included in different pairs) are not particularly limited. Preferably, the colors of the stacked bars of the two amplitude meter display units 418 are different from each other. For example, the color of one stacked bar may be green, and the color of the other stacked bar may be red. In this case, the operator O can easily distinguish between the two stacked bars. Therefore, it is possible to prevent the operator O from misinterpreting the amplitude meter display units 418.

[0044] The operator O checks the amount of change in the stacked bar relative to the moving distance of the wheel electrode 210 to determine whether the currently set full-scale value of the real-time amplitude A is appropriate. For example, if the value and amount of change in the stacked bar are large, the operator O may determine that the currently set full-scale value is small. In this case, the operator O may change the full-scale value to a larger value. Furthermore, for example, if the value and amount of change in the stacked bar are small, the operator O may determine that the currently set full-scale value is large. In this case, the operator O may change the full-scale value to a smaller value. As described above, by checking the value and amount of change of the stacked bar, it is possible to determine whether the full-scale value of amplitude A is appropriate. Furthermore, by checking the value and amount of change of the stacked bar, it is possible to determine whether the full-scale value of the waveform chart, which will be described later, is appropriate. Therefore, it is possible to prevent the waveform chart from over-ranging due to a delay in range switching when passing through a damaged area. As a result, data can be collected within an appropriate range.

[0045] The operator O can confirm the real-time value of the amplitude A from the information displayed in the amplitude range display section 417 and the amplitude meter display section 418. For example, assume that the full-scale value displayed in the amplitude range display section 417 is 1 mV, and the real-time percent amplitude %A displayed in the stacked bar of the amplitude meter display section 418 is 20%. In this case, the real-time value of the amplitude A is 0.2 mV.

[0046] The amplitude range setting button 419 has a function of changing the full-scale value of the real-time amplitude A. The amplitude range setting button 419 includes a range increase button 419a and a range decrease button 419b. The range up button 419a and the range down button 419b are arranged above and below the amplitude range display section 417. In detail, the range up button 419a and the range down button 419b are arranged above and below the two amplitude range display sections 417. Therefore, it is possible to prevent mistakes in changing the full scale value, etc., caused by confusing one amplitude range setting button 419 with the other amplitude range setting button 419. Furthermore, the range up button 419a is located above the range down button 419b, so that the operator O can intuitively increase and decrease the full scale value.

[0047] The range increase button 419a has a function of changing the full scale value to a larger value. For example, when the full scale value is set to 10 mV, the full scale value is changed to 100 mV by the operator O pressing the range increase button 419a. The range down button 419b has a function of changing the full scale value to a smaller value. For example, when the full scale value is set to 10 mV, the full scale value is changed to 1 mV by the operator O pressing the range down button 419b.

[0048] The communication error display unit 412 displays whether or not communication between the display device 400 and the lock-in amplifier is normal. For example, the communication error display unit 412 displays nothing while the communication is normal, and lights up when the communication is not normal.

[0049] The overvoltage display unit 420 displays that an excessively large voltage has been input to the lock-in amplifier. For example, if an excessively large voltage is input to the lock-in amplifier, the overvoltage display unit 420 lights up, allowing the operator O to detect that an excessively large voltage has been input to the lock-in amplifier. Note that if an excessively large voltage is not being input to the lock-in amplifier, the overvoltage display unit 420 does not light up and may not display anything. The display mode of the overvoltage display unit 420 may change depending on whether or not an excessively large voltage is being input to the lock-in amplifier. The communication error display unit 412 and the overvoltage display unit 420 are common to the two sets.

[0050] The chart display unit 430 displays, as a waveform chart, historical information about the phase φ output from the lock-in amplifier and the percent amplitude %A output from the range switcher 320. Furthermore, the chart display unit 430 displays, as a waveform chart, historical information about the value ΣAsinφ or ΣAcosφ obtained by integrating the sine Asinφ or cosine Acosφ of the amplitude of the signal output from the integrator 330. Therefore, the operator O can reliably confirm whether or not a damaged area Bs is present by checking the changes in the waveform chart.

[0051] The chart display unit 430 includes a phase chart display unit 431, an amplitude chart display unit 432, an integration chart display unit 433, an amplitude chart range display unit 434, and a screen scroll button 435. As shown in Fig. 5, the phase chart display unit 431, the amplitude chart display unit 432, and the integration chart display unit 433 display history information with the moving distance or moving time calculated by an encoder (not shown) on the vertical axis and each parameter on the horizontal axis.

[0052] 5, the chart display unit 430 has two phase chart display units 431 and two amplitude chart display units 432. Using these phase chart display units 431 and amplitude chart display units 432 and two measurement signal transmitters 100 with different frequencies, it is possible to eliminate interference signals from adjacent buried objects that are not the target of investigation. Hereinafter, the above-mentioned phase chart display unit 431 and amplitude chart display unit 432 will be described as a set of elements. One set of phase chart display section 431 and amplitude chart display section 432 is located to the right of the other set. Furthermore, each set corresponds to two lock-in amplifiers provided in signal processing device 300. Therefore, information output from each lock-in amplifier is displayed via each set provided in chart display section 430.

[0053] The phase chart display unit 431 displays historical information about the phase φ output from the lock-in amplifier as a waveform chart. The amplitude chart display unit 432 displays historical information about the percent amplitude %A output from the range switcher 320 as a waveform chart. The amplitude chart range display section 434 displays the full-scale value of the amplitude A. As described above, the information displayed on the chart display section 430 is saved at the timing when the encoder pulse is output to the display device 400. Here, if the full-scale value of amplitude A is changed while the wheel electrode 210 is stationary, the amplitude range display section 417 of the real-time data display section 410 displays the full-scale value of amplitude A after the change. On the other hand, because the wheel electrode 210 is stationary, the encoder (not shown) does not output encoder pulses. Therefore, the chart display section 430 does not display the full-scale value of amplitude A after the change, but displays the full-scale value of amplitude A before the change. Therefore, in this case, the operator O can check the full-scale value of amplitude A before the change from the chart display section 430. The integration chart display unit 433 displays, as a waveform chart, historical information about the integration value ΣAsinφ or ΣAcosφ of the sine of the amplitude Asinφ or the cosine of the amplitude Acosφ of the signal output from the integration device 330 . The screen scroll button 435 scrolls the information displayed in the phase chart display section 431, the amplitude chart display section 432, and the integration chart display section 433 in the vertical direction of the paper surface.

[0054] The receiving device 200 described above is a receiving device having a wheel electrode 210 that detects the potential difference on the ground surface by moving along an underground buried object B on the ground surface directly above the underground buried object B, which has a corrosion-resistant coating on its outer surface, and is equipped with a display device 400 that displays information about the potential difference on the ground surface detected by the wheel electrode 210.The display device 400 displays on a single screen: a real-time data display unit 410 that displays real-time information about the value of phase φ and the value of amplitude A, and a chart display unit 430 that displays historical information about the value of phase φ, the value of amplitude A, and the distance traveled by the receiving device 200 as a waveform chart.

[0055] In the conventional receiving device, the operator O needs to detect the position of the damaged part Bs while looking at two screens. According to the above configuration, the display device 400 displays, on a single screen, the real-time data display unit 410, which displays real-time information about the value of the phase φ and the value of the amplitude A, and the chart display unit 430, which displays historical information about the value of the phase φ, the value of the amplitude A, and the travel distance of the receiving device 200 as a waveform chart. Therefore, the operator O can visually confirm the real-time information and the historical information based on the information displayed on the single screen of the display device 400. Therefore, the operator O can detect the position of the damaged area Bs and the presence or absence of the damaged area Bs without moving his or her eyes significantly. This reduces the chance of forgetting to mark the ground surface or making range-switching errors. Furthermore, the display device provided in the conventional receiving device could not simultaneously display real-time information about the value of the phase φ and the value of the amplitude A on one screen. Therefore, it was necessary to select whether to display the value of the phase φ or the value of the amplitude A, for example, using a switching knob. As a result, for example, if the user forgot to switch the display using the knob, the location of the damaged area Bs could be overlooked. According to the above configuration, the display device 400 includes a real-time data display unit 410 that displays real-time information about the value of the phase φ and the value of the amplitude A. Therefore, real-time information about the value of the phase φ and the value of the amplitude A can be displayed simultaneously. This prevents the user from forgetting to switch the display using the switching knob as described above. Furthermore, with conventional receiving devices, the operator O had to check the data displayed on the two screens and also operate an input device provided on the receiving device located on or near the two screens. Therefore, the operator O had to operate two operation locations (screens or input devices), which was time-consuming and could reduce work efficiency. On the other hand, with the above configuration, the operator O can operate the receiving device 200 based on information displayed on a single screen. Therefore, the operator O's time and effort can be reduced and work efficiency can be improved.

[0056] According to the receiving device 200, the operator O can determine the location of damage to the corrosion protective coating based on the information displayed by the real-time data display unit 410, and can determine whether or not damage to the corrosion protective coating has occurred based on the information displayed by the chart display unit 430.

[0057] According to the above configuration, the operator O can determine the location of damage to the corrosion protective coating based on the information displayed by the real-time data display unit 410, and can determine whether or not damage to the corrosion protective coating has occurred based on the information displayed by the chart display unit 430. Here, the real-time data display unit 410 and the chart display unit 430 are displayed on a single screen. Therefore, the operator O can determine the location of damage to the corrosion protective coating and whether or not damage to the corrosion protective coating has occurred based on the information displayed on a single screen.

[0058] According to the receiving device 200, the real-time data display unit 410 includes a phase meter display unit 413 that indicates the value of the phase φ, a phase adjustment button 414 that has a function of adjusting the value of the phase φ, an initial setting button 415 that has a function of initializing the value of the phase φ indicated by the phase meter display unit 413, a lock button 416 that has a function of locking the phase adjustment button 414 and the initial setting button 415, an amplitude range display unit 417 that has a function of displaying the full-scale value of the amplitude A, an amplitude meter display unit 418 that has a function of displaying the ratio of the amplitude A to the full-scale value, i.e., the percentage amplitude %A, and an amplitude range setting button 419 that has a function of changing the full-scale value of the amplitude A.

[0059] According to the above configuration, the phase adjustment button 414 has a function of adjusting the value of the phase φ. Therefore, the operator O can easily adjust the value of the phase φ by pressing the phase adjustment button 414. Furthermore, the initial setting button 415 has a function of initially setting the value of the phase φ indicated by the phase meter display unit 413. Therefore, by pressing the initial setting button 415, the operator O can initially set the value of the phase φ indicated by the phase meter display unit 413. Here, in conventional receiving devices, the initial setting of the value of the phase φ is performed visually by the operator O. Therefore, the operator O can more easily initially set the value of the phase φ. Furthermore, the lock button 416 has a function of locking the phase adjustment button 414 and the initial setting button 415. Therefore, even if the operator O accidentally presses the phase adjustment button 414 or the initial setting button 415, it is possible to prevent the value of the phase φ displayed on the phase meter display unit 413 from being changed unintentionally. Furthermore, the amplitude meter display unit 418 has a function of displaying the percent amplitude %A, so that the operator O can check the percent amplitude %A in real time.

[0060] According to the receiving device 200, the phase meter display unit 413 has a half-moon shaped phase meter 413a, and the center of the phase meter 413a is set to 0 degrees.

[0061] According to the above configuration, the phase meter display unit 413 has a crescent-shaped phase meter 413a, and the center of the phase meter 413a is set to 0 degrees. Therefore, when the wheel electrode 210 passes through the damaged area Bs, the needle changes from the right to the left with 0 degrees as the center value. This allows the operator O to easily determine whether the wheel electrode 210 has passed through the damaged area Bs.

[0062] According to the receiving device 200, the amplitude range display unit 417 includes a full-scale value stacked bar unit 417a that displays the full-scale value of amplitude A as a stacked bar, and a full-scale value numeric display unit 417b that displays the full-scale value of amplitude A as a numeric value.

[0063] According to the above configuration, the amplitude range display unit 417 includes a full-scale value stacked bar section 417a that displays the full-scale value of amplitude A as a stacked bar. Therefore, the operator O can intuitively grasp the full-scale value. Furthermore, the amplitude range display unit 417 includes a full-scale value numeric display section 417b that displays the full-scale value of amplitude A as a numeric value. Therefore, the operator O can visually recognize both the full-scale value stacked bar section 417a and the full-scale value numeric display section 417b. This makes it possible to prevent the operator O from mistaking the full-scale value.

[0064] According to the receiving device 200, the amplitude meter display 418 displays the percentage of the amplitude A relative to the full-scale value, that is, the percentage amplitude %A, as a stacked bar.

[0065] According to the above configuration, the amplitude meter display unit 418 displays the percent amplitude %A as a stacked bar. Therefore, changes in the percent amplitude %A are expressed by the expansion and contraction of the stacked bar. This allows the operator O to intuitively confirm the percent amplitude %A.

[0066] According to the receiving device 200, the amplitude range setting button 419 includes a range up button 419a for changing the full scale value of the amplitude A to a larger value, and a range down button 419b for changing the full scale value of the amplitude A to a smaller value, and the range up button 419a is located above the range down button 419b in the real-time data display section.

[0067] According to the above configuration, range up button 419a is arranged above range down button 419b in real-time data display section 410. Therefore, the full-scale value of amplitude A can be intuitively increased or decreased.

[0068] According to the receiving device 200, the chart display unit 430 displays a waveform chart of the integrated value calculated based on the value of the phase φ and the value of the amplitude A.

[0069] According to the above configuration, the chart display unit 430 displays a waveform chart of the integrated value calculated based on the value of the phase φ and the value of the amplitude A. Therefore, the operator O can determine whether or not damage to the corrosion protection coating has occurred based on the waveform chart of the integrated value in addition to the value of the phase φ and the value of the amplitude A.

[0070] The detection device 1000 described above is a detection device that detects damaged areas Bs in an underground buried object B having a corrosion-resistant coating on its outer surface, and is equipped with a receiving device 200 and a measurement signal transmitter 100 that generates a potential difference at the location where damage to the corrosion-resistant coating occurs, and the measurement signal transmitter 100 is equipped with a counter electrode 120 placed underground.

[0071] According to the above configuration, the detection device 1000 includes the receiving device 200. As described above, the operator O can visually confirm real-time information and the historical information based on the information displayed on one screen of the display device 400. Therefore, by using the detection device 1000, the operator O can detect the position of the damaged area Bs and the presence or absence of the damaged area Bs without moving his or her eyes significantly. This reduces the chance of forgetting to mark the ground surface or making mistakes when switching the range.

[0072] (Variation)

[0073] The technical scope of the present disclosure is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present disclosure.

[0074] For example, the display device 400 may include a system setting button 440. The system setting button 440 has a function for changing settings for information displayed on the display device 400. Therefore, the operator O can change settings for information displayed on the display device 400 by pressing the system setting button 440. The changeable settings may be, for example, whether or not various pieces of information are displayed.

[0075] The screen on which the settings can be changed may be different from the screen on which the real-time data display unit 410 and the chart display unit 430 are arranged. Furthermore, the screen on which the settings can be changed does not have to be displayed when the operator O detects the position of the damaged area Bs using the wheel electrode 210. Furthermore, when the settings need to be changed, the operator O may press the system setting button 440 to display the screen on which the settings can be changed.

[0076] For example, as shown in Fig. 6, the phase meter 413a may be a circular meter. Fig. 6 shows a schematic diagram of the display device 400 when the phase meter 413a is a circular meter. When the phase meter 413a is a circular meter, the movable range of the needle 413b is 360 degrees, from -180 degrees to +180 degrees.

[0077] In addition, within the scope of the present disclosure, the components in the above-described embodiments may be replaced with well-known components as appropriate, and the above-described modified examples may be combined as appropriate.

[0078] (Addendum) <1> A receiving device according to one embodiment of the present disclosure is a receiving device having wheel electrodes that detect the potential difference on the ground surface by moving along an underground buried object on the ground surface directly above the underground buried object whose outer surface is coated with a corrosion-resistant coating, and is equipped with a display device that displays information about the potential difference on the ground surface detected by the wheel electrodes.The display device displays on a single screen: a real-time data display unit that displays real-time information about phase values ​​and amplitude values; and a chart display unit that displays historical information about the phase values, amplitude values, and travel distance of the receiving device as a waveform chart.

[0079] With conventional receiving devices, the operator must check two screens to detect the presence and location of damaged areas. According to the above configuration, the display device displays on a single screen: a real-time data display section that displays real-time information about phase values ​​and amplitude values; and a chart display section that displays historical information about phase values, amplitude values, and the distance traveled by the receiving device as a waveform chart. Therefore, the operator can visually confirm the real-time information and the historical information based on the information displayed on the single screen of the display device. Therefore, the operator can detect the location and presence of damaged areas without moving their eyes significantly. This reduces the chance of forgetting to mark the ground surface or making range-switching errors. Furthermore, the display devices of conventional receivers cannot simultaneously display real-time information about phase and amplitude values ​​on one screen. Therefore, it is necessary to select whether to display phase or amplitude values ​​using, for example, a switching knob. As a result, for example, if the user forgets to switch the display using the knob, the location of the damaged area may be overlooked. According to the above configuration, the display device includes a real-time data display section that displays real-time information about the phase value and the amplitude value. Therefore, real-time information about the phase value and the amplitude value can be displayed simultaneously. This prevents the user from forgetting to switch the display using the switching knob as described above. Furthermore, with conventional receiving devices, the operator had to check the data displayed on the two screens and also operate an input device provided on the receiving device located on or near the two screens. Therefore, the operator had to operate two operating locations (screens or input devices), which was time-consuming and could result in reduced work efficiency. On the other hand, with the above configuration, the receiving device can be operated based on information displayed on a single screen. Therefore, the operator's time and effort can be reduced and work efficiency can be improved.

[0080] <2> the above <1> According to the receiving device of the present invention, it is possible to determine the location of damage to the corrosion-protective coating based on the information displayed by the real-time data display unit, and it is also possible to determine whether or not damage to the corrosion-protective coating has occurred based on the information displayed by the chart display unit.

[0081] According to the above configuration, the operator can determine the location of damage to the corrosion protective coating based on the information displayed by the real-time data display unit, and can determine whether or not damage to the corrosion protective coating has occurred based on the information displayed by the chart display unit. Here, the real-time data display unit and the chart display unit are displayed on a single screen. Therefore, the operator can determine the location of damage to the corrosion protective coating and whether or not damage to the corrosion protective coating has occurred based on the information displayed on the single screen.

[0082] <3> the above <1> or <2> According to the receiving device of the present invention, the real-time data display unit includes a phase meter display unit that indicates a phase value, a phase adjustment button that has a function of adjusting the phase value, an initial setting button that has a function of initializing the phase value indicated by the phase meter display unit, a lock button that has a function of locking the phase adjustment button and the initial setting button, an amplitude range display unit that has a function of displaying the full-scale value of the amplitude value, an amplitude meter display unit that has a function of displaying the ratio of the amplitude value to the full-scale value (percent amplitude), and an amplitude range setting button that has a function of changing the full-scale value of the amplitude value.

[0083] According to the above configuration, the phase adjustment button has a function of adjusting the phase value, so that the operator can easily adjust the phase value by pressing the phase adjustment button. Furthermore, the initial setting button has the function of initializing the phase value indicated by the phase meter display. Therefore, by pressing the initial setting button, the operator can initialize the phase value indicated by the phase meter display. In conventional receiving devices, the initial setting of the phase value was performed by the operator operating a rotary knob or the like and adjusting it visually. Therefore, the operator can more easily initialize the phase value. Furthermore, the lock button has a function of locking the phase adjustment button and the initial setting button, so that even if the operator accidentally presses the phase adjustment button or the initial setting button, the phase value displayed on the phase meter display unit can be prevented from being changed unintentionally. Additionally, the amplitude meter display has the function of displaying the percentage amplitude, so that the operator can see the percentage amplitude in real time.

[0084] <4> the above <3> According to the receiving device of the present invention, the phase meter display unit has a meter in a crescent shape.

[0085] According to the above configuration, the phase meter display unit has a crescent-shaped meter. Therefore, for example, if the center of the meter is 0 degrees, when the wheel electrode passes the damaged area, the needle will move from the right to the left with 0 degrees as the center value. This allows the operator to easily determine whether the wheel electrode has passed the damaged area.

[0086] <5> the above <3> or <4> According to the receiving device, the amplitude range display unit includes a full-scale value stacked bar unit that displays the full-scale value of the amplitude value as a stacked bar, and a full-scale value numeric display unit that displays the full-scale value of the amplitude value as a numeric value.

[0087] According to the above configuration, the amplitude range display unit includes a full-scale value stacked bar unit that displays the full-scale value of the amplitude value as a stacked bar. This allows the operator to intuitively grasp the full-scale value. Furthermore, the amplitude range display unit includes a full-scale value numeric display unit that displays the full-scale value of the amplitude value as a numeric value. This allows the operator to visually recognize both the full-scale value stacked bar unit and the full-scale value numeric display unit. This prevents the operator from mistaking the full-scale value.

[0088] <6> the above <3> ~ <5> In the receiving device according to any one of the above aspects, the amplitude meter display unit displays the ratio (percent amplitude) of the amplitude value to the full scale value as a stacked bar.

[0089] According to the above configuration, the amplitude meter display unit displays the percentage amplitude as a stacked bar. Therefore, changes in the percentage amplitude are expressed by the expansion and contraction of the stacked bar. This allows the operator to intuitively check the percentage amplitude.

[0090] <7> the above <3> ~ <6> According to any one of the above embodiments of the receiving device, the amplitude range setting button includes a range up button for changing the full-scale value of the amplitude value to a larger value, and a range down button for changing the full-scale value of the amplitude value to a smaller value, and the range up button is positioned above the range down button on the real-time data display section.

[0091] According to the above configuration, the range up button is located above the range down button on the real-time data display section, so that the full-scale value can be intuitively increased or decreased.

[0092] <8> the above <1> ~ <7> According to the receiving device according to any one of the above aspects, the chart display unit displays a waveform chart of an integrated value calculated based on a phase value and an amplitude value.

[0093] According to the above configuration, the chart display unit displays a waveform chart of the integrated value calculated based on the phase value and the amplitude value, allowing the operator to determine whether or not the corrosion-protective coating has been damaged based on the waveform chart of the integrated value in addition to the phase value and the amplitude value.

[0094] <9> A detection device according to one aspect of the present disclosure is a detection device for detecting a position where damage to a corrosion-resistant coating has occurred in an underground buried object having an outer surface coated with a corrosion-resistant coating, the detection device comprising: <1> ~ <8> and a measurement signal transmitter that generates a potential difference at a location where damage to the corrosion protection coating has occurred, the measurement signal transmitter having a counter electrode placed underground.

[0095] According to the above configuration, the detection device includes a receiving device. As described above, the operator can visually check real-time information and the historical information based on the information displayed on a single screen of the display device. Therefore, by using the detection device, the operator can detect the location and presence of damaged areas without moving their eyes significantly. This reduces the chance of forgetting to mark the ground surface or making range switching errors. [Explanation of symbols]

[0096] 1000 Detector 100 Measurement signal generator 120 Opposite 200 receiving device 210 Wheel electrode 400 display device 410 Real-time data display section 413 Phase meter display 413a Phase Meter 414 Phase adjustment button 415 Initial Settings Button 416 Lock Button 417 Amplitude range display 417a Full scale value stacked bar 417b Full scale value numeric display 418 Amplitude meter display 419 Amplitude range setting button 419a Range increase button 419b Range down button 430 Chart display section A amplitude B Underground objects Bs Damaged area φ phase

Claims

1. A receiving device having wheel electrodes that moves along an underground buried object on the ground surface directly above the underground buried object, the outer surface of which is coated with a corrosion-resistant coating, to detect a potential difference on the ground surface, a display device that displays information about the potential difference of the ground surface detected by the wheel electrodes; The display device includes: a real-time data display unit that displays real-time information about phase values ​​and amplitude values ​​among the information; a chart display unit that displays the information on the history of the phase value, the amplitude value, and the moving distance of the receiving device as a waveform chart, and displays the information on the history of the phase value, the amplitude value, and the moving distance of the receiving device on one screen. Receiving device.

2. 2. The receiving device according to claim 1, a location of damage to the corrosion-protective coating can be determined based on the information displayed by the real-time data display unit; and It is possible to determine whether or not damage to the corrosion-protective coating has occurred based on the information displayed by the chart display unit. Receiving device.

3. 3. The receiving device according to claim 1, The real-time data display unit a phase meter display that indicates the phase value; a phase adjustment button having a function of adjusting the phase value; an initial setting button having a function of initializing the phase value indicated by the phase meter display unit; a lock button having a function of locking the phase adjustment button and the initial setting button; an amplitude range display unit having a function of displaying a full-scale value of the amplitude value; an amplitude meter display unit having a function of displaying a ratio of the amplitude value to the full scale value; an amplitude range setting button having a function of changing the full scale value of the amplitude value; a receiving device including:

4. 4. The receiving device according to claim 3, The receiving device, wherein the phase meter display unit has a meter in a crescent shape.

5. 4. The receiving device according to claim 3, The amplitude range display unit a full-scale value stacked bar portion that displays the full-scale value of the amplitude value as a stacked bar; a full-scale value numeric display unit that displays the full-scale value of the amplitude value as a numeric value; A receiving device comprising:

6. 4. The receiving device according to claim 3, The amplitude meter display unit The receiving device displays the ratio of the amplitude value to the full scale value as a stacked bar.

7. 4. The receiving device according to claim 3, The amplitude range setting button a range increase button for changing the full scale value of the amplitude value to a larger value; a range down button for changing the full scale value of the amplitude value to a smaller value; Equipped with The receiving device, wherein the range increase button is arranged above the range decrease button on the real-time data display unit.

8. 2. The receiving device according to claim 1, The chart display unit displays a waveform chart of an integrated value calculated based on the phase value and the amplitude value.

9. A detection device for detecting a position where damage to the corrosion-resistant coating has occurred in the underground buried object having the corrosion-resistant coating applied to an outer surface thereof, the detection device comprising: a receiving device according to claim 1 or 2; and a measurement signal transmitter that generates a potential difference at a position where damage to the corrosion-protective coating has occurred, A detection device, wherein the measurement signal transmitter comprises a counter electrode disposed in the ground.

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