JP2013221875A - Saturation degree measuring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid a locally measuring range and to enable monitoring for a long period without requiring labor and time for an installing work.SOLUTION: A saturation degree measuring system 1 includes: a power transmission section 2 configured by connecting a transmission antenna 6 to an AC power source 5; a power reception section 3 including a reception antenna 7; and an arithmetic processing section 4 performing data processing on power values measured by the power transmission section 2 and the power reception section 3. Each of the transmission antenna 6 and the reception antenna 7 is buried into a ground 8 and power is transmitted from the power transmission section 2 to the power reception section 3 by magnetic field resonant coupling. The arithmetic processing section 4 includes a transmission efficiency calculation section 11 calculating power transmission efficiency using the power values of the transmission antenna 6 and the reception antenna 7, and a saturation degree estimation section 12 estimating a saturation degree in an area 13 of the ground 8 interposed between the transmission antenna 6 and the reception antenna 7 using the power transmission efficiency.

Description

  The present invention relates to a saturation measurement system that mainly measures moisture saturation in the ground.

  In the final disposal of radioactive waste, high-level radioactive waste is planned to be disposed deep in a bedrock of several hundred meters below ground in a state of being confined in an artificial barrier made of vitrified material, overpack and cushioning material. The low-level radioactive waste is placed in a relatively shallow ground in a state where waste solidified with cement or the like is placed in a concrete pit in the form of a drum can and surrounded by an artificial barrier made of cushioning material. However, it is necessary to monitor the physical properties of the cushioning material that constitutes the artificial barrier over a long period of time.

  The material that constitutes the buffer material is bentonite that has the ability to delay the movement of groundwater by exhibiting water absorption due to swelling, and for such bentonite, the proportion of water in the gap, that is, water saturation Hydraulic characteristics represented by degrees (hereinafter simply referred to as saturation) are important monitoring indicators.

  Bentonite saturation can be measured by the time domain measurement method called TDR (Time-Domain Reflectometry) and the frequency domain measurement method called FDR (Frequency-Domain Reflectometry) in addition to the resistivity method and RI method. is there.

  These methods pay attention to the difference between the dielectric constant of the ground constituent material and air and the dielectric constant of water, and since the apparatus can be miniaturized, it has been widely adopted ( Patent Document 1).

JP 2010-139246 A JP 2011-160496 A

  However, in the above-described TDR and FDR, there is a possibility that the measurement range may be limited to a local ground region in the vicinity of the probe, which causes a problem that it is difficult to measure a ground region away from the probe.

  In addition, when TDR or FDR probes are embedded in the ground, it is necessary to embed the power supply cable to the probe together with the ground, so that it is troublesome to install when the measurement depth is deep or the measurement range is large. In order to avoid this problem, and trying to adopt a battery power supply to avoid it, there has been a problem that monitoring over a long period of time becomes difficult.

  The present invention has been made in consideration of the above-described circumstances. A saturation measurement system that avoids the measurement range from becoming local, does not require labor for installation work, and can be monitored over a long period of time. The purpose is to provide.

  In order to achieve the above object, a saturation measurement system according to the present invention includes a power transmission unit in which a transmission antenna is connected to an AC power source, and a reception antenna that is electromagnetically resonantly coupled to the transmission antenna. And a power receiving unit configured to transmit power from the power transmitting unit via the receiving antenna, and a transmission that calculates a ratio of a power value of the receiving antenna to a power value of the transmitting antenna as power transmission efficiency Applying the efficiency calculation unit and the power transmission efficiency to the saturation-transmission efficiency characteristic indicating the relationship between the saturation of the medium and the power transmission efficiency at the saturation, the saturation corresponding to the power transmission efficiency And a saturation estimation unit that estimates this as the saturation of a medium interposed between the transmission antenna and the reception antenna.

  Further, the saturation measurement system according to the present invention includes a wireless transmission unit in each of the power transmission unit and the power reception unit, and the power value transmitted through each wireless transmission unit can be received. A transmission efficiency calculation unit is configured.

  The saturation measurement system according to the present invention is a saturation measurement system including a power transmission unit in which a transmission antenna is connected to an AC power source, and a plurality of power reception units each provided with a reception antenna, Each power receiving unit has its receiving antenna electromagnetically coupled to the transmitting antenna so that power is transmitted from the power transmitting unit, or the receiving antenna is electromagnetically resonantly coupled to a receiving antenna belonging to another power receiving unit. The power of two antennas that constitute at least one pair of antennas that are electromagnetically resonantly coupled to each other among the transmitting antenna and the plurality of receiving antennas are configured so that power is indirectly transmitted from the power transmission unit. A transmission efficiency calculation unit that calculates the ratio of the power value of the antenna pair from the value as power transmission efficiency, and the power transmission efficiency is calculated with the saturation of the medium. The saturation corresponding to the power transmission efficiency is obtained by applying it to the saturation-transmission efficiency characteristic indicating the relationship with the power transmission efficiency in the saturation, and this is estimated as the saturation of the medium interposed between the antenna pair. And a saturation estimation unit.

  In the saturation measurement system according to the present invention, the transmission antenna and the plurality of reception antennas are arranged in a line.

  In addition, the saturation measurement system according to the present invention is configured to electromagnetically resonance-couple antenna pairs each including two adjacent antennas of the transmission antenna and the plurality of reception antennas, and to set power values of the respective antennas. It is configured to measure.

  In addition, the saturation measurement system according to the present invention transmits the power value to the power transmission unit or the power reception unit provided with an antenna from which the power value is measured among the transmission antenna and the plurality of reception antennas. Each of the transmission efficiency calculation units is configured so that a wireless transmission unit is provided and the power value transmitted through each wireless transmission unit can be received.

  Moreover, the saturation measuring system which concerns on this invention uses the said medium as a buffer material of the artificial barrier at the time of carrying out geological disposal of radioactive waste.

  The so-called wireless power transmission that transmits power without contact is classified into a radiation type using microwaves and lasers and a non-radiation type using electromagnetic induction. Since the gap) is as small as several centimeters to several tens of centimeters, the application range is limited.

  Recently, research on electromagnetic resonance coupling (electromagnetic resonance) as one of non-radiation type wireless transmission systems has been conducted. By using electromagnetic resonance coupling between a transmitting antenna and a receiving antenna, Even if the gap is several meters, it is possible to transmit power from the transmitting antenna to the receiving antenna with an efficiency of 50% or more, and a wide range of applications is expected in the future (Patent Document 2).

  When transmitting power from a transmitting antenna to a receiving antenna by electromagnetic resonance coupling, the present applicants pay attention to the fact that the transmission efficiency differs depending on the degree of saturation of the medium spreading between the transmitting antenna and the receiving antenna. As a result of research and development on whether the saturation of the ground can be measured, the present invention has been made.

  That is, in the saturation measurement system according to the present invention, first, the transmission antenna and the reception antenna are embedded in the medium to be measured. In some cases, the transmission antenna may be arranged so as to contact the surface of the medium.

  Here, the reception antenna transmits electromagnetic power from the power transmission unit by electromagnetic resonance coupling with the transmission antenna of the power transmission unit, or electromagnetic resonance coupling with reception antennas belonging to other power reception units. The power is transmitted from the power transmission unit indirectly.

  On the other hand, for the medium to be measured, the relationship between the saturation and the power transmission efficiency at that time is obtained in advance as the saturation-transmission efficiency characteristic.

  In determining the saturation-transmission efficiency characteristics, the types of media such as sandy soil, cohesive soil, bentonite mixed soil, and bentonite are determined, and various water-containing conditions are prepared for the media. The antenna is embedded in the same configuration as when the saturation measurement is performed, and the power value of each antenna is measured in this state, and the power transmission efficiency between the antennas is calculated from the measured power value. For example, the saturation may be measured by a specific resistance method, and the relationship between the power transmission efficiency and the saturation may be obtained therefrom.

  Although it is known that the saturation is obtained by utilizing the change in the dielectric constant and permeability of the medium depending on the magnitude of the saturation, in the present invention, at the time of power transmission in electromagnetic resonance coupling. This is different from the conventional saturation estimation method in that the saturation is estimated by obtaining the power transmission efficiency.

  Next, the AC power supply of the power transmission unit is activated, and the power of the power transmission unit is received by a reception antenna that is electromagnetically resonantly coupled to the transmission antenna of the power transmission unit, and in some cases, another reception that is electromagnetically resonantly coupled to the reception antenna. The power is sequentially transmitted to the power reception unit via the antenna, the power value of each antenna at that time is measured, and the power transmission efficiency between the antennas is calculated by the transmission efficiency calculation unit using the power value.

  In calculating the power transmission efficiency, for example, a transmission efficiency calculation unit is configured as one of the arithmetic processing units in a computer installed in a management facility on the ground, and the power value measured by each antenna is wired or wireless. After data transmission, the power value may be input to the transmission efficiency calculation unit.

  The power transmission efficiency is calculated as the ratio of the power value of the receiving antenna to the power value of the transmitting antenna when the power receiving unit is configured as a single power receiving unit, but when it is configured as a plurality of power receiving units Is calculated as a ratio of power values in at least one pair of antenna pairs that are electromagnetically coupled to each other among the transmission antenna and the plurality of reception antennas.

  For example, when a saturation measurement system according to the present invention is configured by a power transmission unit and two power reception units, a maximum of three antenna pairs from among a transmission antenna and two reception antennas are configured to be capable of electromagnetic resonance coupling. For example, it is assumed that the power transmission efficiency of two pairs of antennas is calculated from them, and when the power transmission unit and the three power reception units are configured, the transmission antenna and the three reception antennas It is assumed that a maximum of six antenna pairs are configured so as to be capable of electromagnetic resonance coupling, and the power transmission efficiency of, for example, three antenna pairs is calculated from them.

  When a plurality of power receiving units are provided as described above, the power transmission efficiency can be calculated only in the antenna pair that is electromagnetically coupled to each other and can transmit power from the power transmitting unit. It is not necessary to calculate all the power transmission efficiencies for antenna pairs that are capable of electromagnetic resonance coupling.

  Next, by applying the power transmission efficiency calculated by the transmission efficiency calculation unit to the above-described saturation-transmission efficiency characteristic, the saturation estimation unit performs an operation for obtaining the saturation corresponding to the power transmission efficiency, When the power receiving unit is configured with a single power receiving unit, the degree of saturation of the medium interposed between the transmission antenna and the receiving antenna is estimated, and when the power receiving unit is configured with a plurality of power receiving units. Is estimated as the saturation of the medium interposed between the antenna pair.

  In this way, power transmission using electromagnetic resonance coupling is possible even with an air gap of about several meters, so that the saturation of the medium can be estimated as an average value rather than a local value. It becomes possible.

  Also, when transmitting the power value measured by the receiving antenna of the power receiving unit, whether it is wireless or wired, the power required for the data transmission can be covered by the power transmitted by electromagnetic resonance coupling. In addition, it is not necessary to install a power supply cable or install a battery to replace it, and to perform maintenance and inspection work for them.Thus, long-term monitoring can be realized reliably and at low cost, and a power supply cable to the power receiving unit Since it is not necessary to embed in the medium, the initial installation work is greatly simplified as compared with the prior art.

  In the present invention, the power transmission efficiency when power is transmitted by electromagnetic resonance coupling is the basic data for estimating the saturation, and the configuration of the load in the power receiving unit is arbitrary. In the case where the unit is provided, the wireless transmission unit becomes a load in the power reception unit, and the wireless transmission unit can be operated with the transmitted power.

  The transmitting antenna and the receiving antenna may be configured in any manner as long as they can transmit power by electromagnetic resonance coupling, and may be resonance coupling by a magnetic field or resonance coupling by an electric field. In the case of resonance coupling, a helical antenna that is a magnetic field type antenna can be used, and in the case of resonance coupling by an electric field, a meander line antenna that is an electric field type antenna can be used.

  In the case where the power receiving unit is composed of a plurality of power receiving units, it is arbitrary how the transmitting antenna and the plurality of receiving antennas are arranged relative to each other, but if these are arranged in a row, a farther region, or The configuration is suitable when a deeper region is to be measured.

  Here, among the transmission antenna and the plurality of reception antennas, if the antenna pair composed of two adjacent antennas is electromagnetically coupled to each other and the power value of each antenna is measured, the transmission antenna In addition, it is possible to measure the degree of saturation of the medium along the array arrangement path of the plurality of receiving antennas between all the antennas at once.

  The measured power value may be transmitted to the ground via a data transmission cable embedded in the medium. Alternatively, when the power receiving unit is configured by a single power receiving unit If so, the power transmission unit and the power receiving unit can each be provided with a radio transmission unit, and the transmission efficiency calculation unit can be configured to receive data of the power value transmitted through each radio transmission unit. If the power receiving unit is composed of a plurality of power receiving units, the power value is transmitted to the power transmitting unit or the power receiving unit provided with the antenna from which the power value is measured among the transmitting antenna and the plurality of receiving antennas. It is possible to configure a transmission efficiency calculation unit so that a wireless transmission unit for transmission is provided, and a power value transmitted through each wireless transmission unit can be received.

  According to such a configuration, the installation work of not only the power supply cable but also the data transmission cable is reduced, so that the initial installation work is further facilitated. Note that it is sufficient that the wireless transmission unit is provided only for the antenna whose power value is measured, and it is not necessary to provide the wireless transmission unit for the antenna dedicated for power transmission or power relay.

  In applying the present invention, various materials and materials including ground constituent materials can be used as a medium for measuring the degree of saturation, but a buffer material for an artificial barrier when geological disposal of radioactive waste is performed. If the present invention is applied to the measurement of the degree of saturation of the medium as a medium and the present invention is capable of realizing reliable monitoring over a long period of time and at low cost, the geological disposal of radioactive waste can be soundly managed and managed. Is possible.

It is a figure of the saturation measuring system which concerns on 1st Embodiment, (a) is a block diagram, (b) is a layout. The equivalent circuit diagram which shows the magnetic field resonance coupling of a transmitting antenna and a receiving antenna. A graph showing the saturation-transmission efficiency characteristics. The block diagram of the saturation measuring system which concerns on 2nd Embodiment. The arrangement plan of the saturation measuring system concerning a 2nd embodiment. The arrangement plan of the saturation measuring system concerning the modification of a 2nd embodiment.

  Embodiments of a saturation measurement system according to the present invention will be described below with reference to the accompanying drawings.

[First Embodiment]
FIG. 1A is a block diagram showing a saturation measuring system according to the first embodiment. As shown in FIG. 2A, a saturation measurement system 1 according to this embodiment is an example in which the saturation measurement system according to the present invention is applied to saturation estimation of the ground 8, and includes a power transmission unit 2 and a power reception unit. Unit 3, an arithmetic processing unit 4 for data processing of power values measured by the power transmission unit and the power reception unit, and a storage unit 15 in which data necessary for the arithmetic processing unit is stored and saved. Includes an AC power supply 5 and a transmission antenna 6 connected to the AC power supply, and the power reception unit 3 is provided with a reception antenna 7.

  The transmission antenna 6 is embedded in the vicinity of the ground surface of the ground 8 as a medium, and the reception antenna 7 is also in the ground 8 and below the transmission antenna 6 as shown in the layout diagram of FIG. It is buried in

  FIG. 2 is an equivalent circuit diagram showing magnetic resonance coupling between the transmitting antenna 6 and the receiving antenna 7. As shown in the figure, the transmitting antenna 6 and the receiving antenna 7 are configured to be magnetically coupled to each other (magnetic field resonance) and to transmit power from the power transmitting unit 2 to the power receiving unit 3 by the magnetic field resonant coupling. It is.

  The transmitting antenna 6 and the receiving antenna 7 are each preferably composed of helical coils formed in a spiral shape so as to be suitable for magnetic field resonance.

  On the other hand, the power transmission unit 2 is provided with a power measurement unit 9 that measures the power value of the transmission antenna 6, and the power reception unit 3 is provided with a power measurement unit 10 that measures the power value of the reception antenna 7. 4 includes a transmission efficiency calculation unit 11 that calculates the ratio of the power value of the reception antenna 7 to the power value of the transmission antenna 6 using the measured power value as power transmission efficiency, and the transmission antenna using the power transmission efficiency. 6 and a reception antenna 7 are provided with a saturation estimation unit 12 for estimating the saturation in the region 13 of the ground 8 interposed.

  Here, the saturation estimation unit 12 corresponds to the power transmission efficiency by applying the power transmission efficiency calculated by the transmission efficiency calculation unit 11 to the saturation-transmission efficiency characteristic read from the storage unit 15. The saturation is obtained and estimated as the saturation of the region 13.

  The arithmetic processing unit 4 includes hardware such as a motherboard, a CPU, a memory, and a built-in hard disk of a personal computer 14 installed in a ground management facility (not shown), and software that operates on the hardware. The storage unit 15 can be configured by a built-in hard disk of the personal computer.

  In order to estimate the saturation of the region 13 in the ground 8 using the saturation measurement system 1 according to the present embodiment, first, prior to the saturation estimation, the saturation of the soil that is a constituent material of the region 13 and the current level The relationship with the power transmission efficiency is created in advance as saturation-transmission efficiency characteristics.

  FIG. 3 is a graph showing the created saturation-transmission efficiency characteristics. As shown in the figure, the saturation-transmission efficiency characteristic shows the relationship between the horizontal axis with the power transmission efficiency and the vertical axis with the saturation. The higher the power transmission efficiency, the higher the saturation level. Tends to decline.

  In obtaining saturation-transmission efficiency characteristics, the same soil material as the soil constituting the region 13 is prepared in various water-containing states, and this is put into, for example, an indoor test soil tank and the transmitting antenna 6 and The receiving antenna 7 is embedded in the same relative positional relationship as the configuration shown in FIG. 1B, and the power values of the transmitting antenna 6 and the receiving antenna 7 are measured in this state, and the measured power value is used between the antennas. While calculating the power transmission efficiency, the degree of saturation of the soil material at that time may be measured by, for example, a specific resistance method, and the relationship between the power transmission efficiency and the degree of saturation may be obtained therefrom.

  The created saturation-transmission efficiency characteristics are stored in the storage unit 15 so that they can be read from the arithmetic processing unit 4.

  The degree of saturation of the region 13 in the ground 8 is estimated by the following procedure. That is, first, the AC power source 5 of the power transmission unit 2 is activated, and the power of the power transmission unit 2 is transmitted to the power reception unit 3 via the reception antenna 7 that is magnetically coupled to the transmission antenna 6 of the power transmission unit. Each power value of the transmitting antenna 6 and the receiving antenna 7 is measured by the power measuring units 9 and 10 and transferred to the personal computer 14 on the ground.

Next, using each power value of the transmitting antenna 6 and the receiving antenna 7 measured by the power measuring units 9 and 10, the following equation:
Power transmission efficiency = power value of receiving antenna 7 / power value of transmitting antenna 6
Thus, the power transmission efficiency between the antennas is calculated by the transmission efficiency calculation unit 11.

  Next, the saturation-transmission efficiency characteristic stored in advance is read from the storage unit 15 and the power transmission efficiency calculated by the transmission efficiency calculation unit 11 is applied to the saturation-transmission efficiency characteristic. The saturation corresponding to the efficiency is calculated by the saturation estimation unit 12, and the saturation is estimated as the saturation of the region 13 in the ground 8.

  As described above, according to the saturation measurement system 1 according to the present embodiment, power transmission using magnetic field resonance coupling is possible even with an air gap of about several meters. Can be estimated not as a local value but as an average value.

  Further, when transmitting the power value of the receiving antenna 7 measured by the power receiving unit 3, whether it is wireless or wired, the power required for the data transmission is the power transmitted from the transmitting unit 2 by magnetic resonance coupling. Therefore, it is not necessary to install a power supply cable, install a battery to replace it, and maintain and inspect them. Thus, long-term monitoring can be realized reliably and at low cost. Since it is not necessary to embed a power supply cable to the ground 8, the initial installation work is greatly simplified as compared with the prior art.

  Although not particularly mentioned in the present embodiment, the power transmission unit 2 and the power receiving unit 3 are each provided with a wireless transmission unit, and the transmission efficiency is such that the power value transmitted through the wireless transmission unit can be received. If the calculation part 11 is comprised, since not only a power supply cable but the installation work of a data transmission cable is also reduced, initial installation work becomes still easier.

  In the present embodiment, power transmission is performed by magnetic field resonance coupling, but electric field resonance coupling may be used instead.

[Second Embodiment]
Next, a second embodiment will be described. Note that components that are substantially the same as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 4 is a block diagram showing a saturation measuring system according to the second embodiment, and FIG. 5 is a layout diagram thereof. As shown in these drawings, the saturation measurement system 41 according to the present embodiment is a radioactive waste artificial barrier formed in the ground 8 of the saturation measurement system according to the present invention, and constitutes the artificial barrier. It is an example applied to the saturation estimation of bentonite 48 as a buffer material, and includes a power transmission unit 2, a power reception unit 3a, a power reception unit 3b, and a power reception unit 3c, and a power reception unit 3a, a power reception unit 3b, and a power reception unit 3c. Are provided with receiving antennas 7a, 7b, and 7c, respectively, and the arithmetic processing unit 4 is configured to perform data processing on the power values measured by the power transmitting unit 2 and the power receiving units 3a, 3b, and 3c.

  The transmitting antenna 6 is embedded in the ground 8 in the vicinity of the bentonite so as to contact the bentonite 48 as a medium, and the receiving antennas 7a, 7b, 7c are deep inside the bentonite 48 and below the transmitting antenna 6. It is sequentially embedded in a row along the direction. Here, the receiving antennas 7a, 7b, and 7c have the same configuration as the receiving antenna 7, and the description thereof is omitted.

  As described with reference to FIG. 2, the transmitting antenna 6 and the receiving antenna 7a are magnetically coupled to each other, and power is transmitted from the power transmitting unit 2 to the power receiving unit 3a by the magnetic field resonant coupling. By the same magnetic field resonance coupling, the receiving antennas 7a and 7b and the receiving antennas 7b and 7c are magnetic field resonance coupled to each other, and the magnetic field resonance coupling causes the power receiving unit 3a to the power receiving unit 3b, and further from the power receiving unit 3b to the power receiving unit. Electric power is sequentially transmitted to 3c.

  That is, the transmitting antenna 6 and the receiving antenna 7a, the receiving antenna 7a and the receiving antenna 7b, and the receiving antenna 7b and the receiving antenna 7c respectively constitute an antenna pair in the present invention. In the present embodiment, it is assumed that the three antenna pairs having combinations other than those described above are not magnetically coupled to each other.

  The power receiving units 3a, 3b, and 3c include power measuring units 10a, 10b, and 10c that measure the power values of the receiving antennas 7a, 7b, and 7c as well as the power receiving unit 3 of the first embodiment. Wireless transmission units 42a, 42b, and 42c that transmit data of the respective power values are provided.

  The transmission efficiency calculation unit 11 receives data of each power value from the radio transmission units 42a, 42b, and 42c via a radio reception unit (not shown), and receives a reception antenna for the power value of the transmission antenna 6 from these power values. The ratio of the power value of 7a, the ratio of the power value of the receiving antenna 7b to the power value of the receiving antenna 7a, and the ratio of the power value of the receiving antenna 7c to the power value of the receiving antenna 7b are respectively calculated as power transmission efficiency. Yes.

  The saturation estimation unit 12 applies each power transmission efficiency calculated by the transmission efficiency calculation unit 11 to the saturation-transmission efficiency characteristic read from the storage unit 15, so that the saturation corresponding to each power transmission efficiency is obtained. The degree of saturation is determined as the degree of saturation of the regions 13a, 13b, and 13c in the bentonite 48 interposed between the transmitting antenna 6 and the receiving antenna 7a, between the receiving antennas 7a and 7b, and between the receiving antennas 7b and 7c. Each is supposed to be estimated.

  In order to estimate the saturation of the regions 13a, 13b, and 13c of the bentonite 48 using the saturation measurement system 41 according to the present embodiment, first, prior to the saturation estimation, the saturation of the bentonite 48 to be measured and its The relationship with the current power transmission efficiency is created in advance as saturation-transmission efficiency characteristics as in the first embodiment.

  In obtaining the saturation-transmission efficiency characteristics, the same bentonite material as the bentonite 48 is prepared in various water-containing states, which are put into, for example, an indoor test soil tank, and the transmitting antenna 6 and the receiving antenna 7a, 7b and 7c are embedded in the same relative positional relationship as the configuration shown in FIG. 5, and the power values of the transmitting antenna 6 and the receiving antennas 7a, 7b, and 7c are measured in this state, and between the antennas based on the measured power values On the other hand, the degree of saturation of bentonite at that time is measured by, for example, a specific resistance method, and the relationship between the power transmission efficiency and the degree of saturation may be obtained therefrom.

  The created bentonite is stored in the storage unit 15 so that the saturation-transmission efficiency characteristic can be read from the arithmetic processing unit 4.

  The degree of saturation of the regions 13a, 13b, and 13c in the bentonite 48 is estimated by the following procedure. That is, first, the AC power supply 5 of the power transmission unit 2 is activated, and the power of the power transmission unit 2 is transmitted to the power reception unit 3a via the reception antenna 7a that is magnetically coupled to the transmission antenna 6 of the power transmission unit. The power transmitted to the unit 3a is transmitted to the power receiving unit 3b via the receiving antenna 7b that is magnetically resonantly coupled to the receiving antenna 7a, and the power transmitted to the power receiving unit 3b is coupled to the receiving antenna 7b and the magnetic field resonant coupling Are sequentially transmitted to the power receiving unit 3c via the receiving antenna 7c.

  On the other hand, the power values of the transmitting antenna 6 and the receiving antennas 7a, 7b, and 7c when the power of the power transmitting unit 2 is successively transmitted to the power receiving units 3a, 3b, and 3c by the magnetic field resonance coupling are represented by the power measuring unit 9 and the power. The measurement units 10a, 10b, and 10c respectively measure and transfer these to the personal computer 14 on the ground via a communication cable (not shown) and the wireless transmission units 42a, 42b, and 42c.

Next, using each power value of the transmitting antenna 6 and the receiving antenna 7a measured by the power measuring unit 9 and the power measuring unit 10a,
Power transmission efficiency = power value of receiving antenna 7a / power value of transmitting antenna 6
Thus, the power transmission efficiency between the transmission antenna 6 and the reception antenna 7a is calculated by the transmission efficiency calculation unit 11, and the reception antennas 7a and 7b and the reception antennas 7b, which are measured by the power measurement units 10a, 10b, and 10c. The power transmission efficiency between the antennas is similarly calculated by the transmission efficiency calculation unit 11 using each power value of 7c.

  Next, the saturation-transmission efficiency characteristics stored in advance are read from the storage unit 15 and each power transmission efficiency calculated by the transmission efficiency calculation unit 11 is applied to the saturation-transmission efficiency characteristics. The saturation level corresponding to the power transmission efficiency is calculated by the saturation level estimation unit 12, and each saturation level is estimated as the saturation level of the regions 13 a, 13 b, and 13 c in the bentonite 48.

  As described above, according to the saturation measurement system 41 according to the present embodiment, power transmission using magnetic field resonance coupling is possible even with an air gap of about several meters. Can be estimated as an average value rather than a local value.

  In addition, when data is transmitted from the power values of the receiving antennas 7a, 7b, and 7c measured by the power receiving units 3a, 3b, and 3c, the necessary power is covered by the power sequentially transmitted from the transmitting unit 2 by magnetic resonance coupling. Therefore, it is not necessary to install a power supply cable, install a battery to replace it, and to perform maintenance and inspection work for them. Thus, long-term monitoring can be realized reliably and at low cost, and the power receiving unit 3a, Since it is not necessary to embed the power supply cable to 3b and 3c in the bentonite 48, the initial installation work is greatly simplified as compared with the conventional case.

  Further, according to the saturation measuring system 41 according to the present embodiment, the receiving antennas 7a, 7b, and 7c provided in the plurality of power receiving units 3a, 3b, and 3c are arranged in a row along the depth direction together with the transmitting antenna 6. Since it is arranged in a deeper area, a deeper region can be measured.

  In addition, according to the saturation measurement system 41 according to the present embodiment, the antenna pair composed of two adjacent antennas among the transmission antenna 6 and the reception antennas 7a, 7b, and 7c is electromagnetically resonantly coupled to each other. Since the antenna power values are respectively measured, the saturation of the bentonite 48 along the columnar arrangement path of the transmission antenna 6 and the reception antennas 7a, 7b, and 7c is measured between all the antennas and collectively. It becomes possible.

  In addition, according to the saturation measurement system 41 according to the present embodiment, the wireless transmission units 42a, 42b, and 42c for transmitting data of the measured power values are provided in the power receiving units 3a, 3b, and 3c, respectively. The installation work of not only the power supply cable but also the data transmission cable is reduced, so that the initial installation work is further facilitated.

  In addition, according to the saturation measurement system 41 according to the present embodiment, since the bentonite 48, which is a buffer material for an artificial barrier when geologically disposing radioactive waste, is used as a saturation measurement target medium, Low-cost monitoring makes it possible to operate and manage geological disposal of radioactive waste in a sound manner.

  In addition, it is not necessary to connect the power supply cable to the receiving antennas 7a, 7b, and 7c, and the data transmission cables are connected to the power measuring units 10a, 10b, and 10c by providing the wireless transmission units 42a, 42b, and 42c. Since it is not necessary, no cables penetrating the bentonite 48 are laid, and thus it is possible to prevent the water mist communicating with the ground 8 from being formed in the bentonite 48 in advance.

  In the present embodiment, the example in which the radioactive waste is applied to the buffer material of the artificial barrier when the geological disposal is performed has been described, but it goes without saying that it can be applied to a general ground instead.

  In the present embodiment, power transmission is performed by magnetic field resonance coupling, but electric field resonance coupling may be used instead.

  In this embodiment, the transmitting antenna 6 and the receiving antennas 7a, 7b, and 7c are embedded in the bentonite 48 so as to form a line along the depth direction, and among them, adjacent antenna pairs, that is, the transmitting antenna 6 And the receiving antenna 7a, the receiving antenna 7a and the receiving antenna 7b, the receiving antenna 7b and the receiving antenna 7c are respectively coupled by magnetic field resonance, and the power values of the transmitting antenna 6 and the receiving antennas 7a, 7b, and 7c are set. However, it is not necessary to measure the power values for all these four antennas. Instead of the above-described embodiment, for example, as shown in FIG. 6A, the power values at the receiving antennas 7a and 7b are measured. Measurement may be omitted, and only the power values of the transmission antenna 6 and the reception antenna 7c may be measured, as shown in FIG. Sea urchin, omit the measurement of the power value of the transmitting antenna 6 and the receiving antenna 7a, the receiving antenna 7b, may be measured only power values of 7c.

  In the case of such a modification, in the case of FIG. 9A, the saturation of the region 13d over a relatively wide range extending between the transmission antenna 6 and the reception antenna 7c is different from that of the reception antenna in the case of FIG. The saturation level of the region 13d extending between 7b and 7c is measured. In addition, the receiving antennas 7a and 7b in FIG. 6A and the transmitting antenna 6 and the receiving antenna 7a in FIG.

  In this embodiment, the transmitting antenna 6 and the receiving antennas 7a, 7b, and 7c are embedded in the bentonite 48 so as to form a line along the depth direction, and among them, adjacent antenna pairs, that is, the transmitting antenna 6 And the receiving antenna 7a, the receiving antenna 7a and the receiving antenna 7b, and the receiving antenna 7b and the receiving antenna 7c are configured to be magnetically coupled to each other, but the relative arrangement configuration of the transmitting antenna and the receiving antenna is arbitrary, Of these, it is arbitrary which antenna pair is electromagnetically resonantly coupled.

DESCRIPTION OF SYMBOLS 1,41 Saturation measurement system 2 Power transmission part 3, 3a, 3b, 3c Power reception part 4 Arithmetic processing part 5 AC power supply 6 Transmitting antenna 7, 7a, 7b, 7c Reception antenna 8 Ground (medium)
11 Transmission efficiency calculation unit 12 Saturation degree estimation unit 42a, 42b, 42c Wireless transmission unit

Claims (7)

A power transmission unit in which a transmission antenna is connected to an AC power supply, and a power reception unit that is provided with a reception antenna that is electromagnetically resonantly coupled to the transmission antenna, and through which the power is transmitted from the power transmission unit A transmission efficiency calculation unit that calculates a ratio of the power value of the reception antenna to the power value of the transmission antenna as power transmission efficiency; and the power transmission efficiency as the degree of saturation of the medium and the power transmission efficiency at the degree of saturation. Is applied to the transmission efficiency characteristics, and the saturation corresponding to the power transmission efficiency is obtained, and this is estimated as the saturation of the medium interposed between the transmitting antenna and the receiving antenna. A saturation measurement system comprising a degree estimation unit. 2. The transmission efficiency calculation unit according to claim 1, wherein a wireless transmission unit is provided in each of the power transmission unit and the power reception unit, and the transmission efficiency calculation unit is configured to receive data of a power value transmitted through each wireless transmission unit. Saturation measurement system. A saturation measurement system comprising a power transmission unit in which a transmission antenna is connected to an AC power source and a plurality of power reception units each provided with a reception antenna, wherein each power reception unit is connected to the transmission antenna. Power is transmitted from the power transmission unit by electromagnetic resonance coupling with the power transmission unit, or power is indirectly transmitted from the power transmission unit by electromagnetic resonance coupling of the reception antenna with a reception antenna belonging to another power reception unit. And the ratio of the power value of the antenna pair to the power value of at least one pair of antenna pairs that are electromagnetically coupled to each other among the transmitting antenna and the plurality of receiving antennas. A transmission efficiency calculation unit that calculates the transmission efficiency, and the power transmission efficiency, which indicates the relationship between the saturation of the medium and the power transmission efficiency at the saturation. A saturation degree estimation unit that obtains a saturation degree corresponding to the power transmission efficiency by applying to a degree-transmission efficiency characteristic, and estimates this as a saturation degree of a medium interposed between the antenna pairs. Saturation measurement system. The saturation measurement system according to claim 3, wherein the transmission antenna and the plurality of reception antennas are arranged in a line. 5. The saturation according to claim 4, wherein among the transmitting antenna and the plurality of receiving antennas, an antenna pair composed of two adjacent antennas is electromagnetically coupled to each other and a power value of each antenna is measured. Degree measurement system. Among the transmission antenna and the plurality of reception antennas, a radio transmission unit that transmits data of the power value is provided in the power transmission unit or the power reception unit provided with an antenna for measuring a power value, and each of the radio transmissions The saturation measurement system according to any one of claims 3 to 5, wherein the transmission efficiency calculation unit is configured so that the power value transmitted through the unit can be received. The saturation measuring system according to any one of claims 1 to 6, wherein the medium is used as a buffer material for an artificial barrier when the radioactive waste is disposed of.

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