JP2008145232A - Magnetization evaluation device - Google Patents

Abstract

An object of the present invention is to evaluate the magnetization of a fluid.
A magnetization evaluation apparatus includes a magnetic sensor unit and an evaluation unit. The magnetic sensor unit 12 includes a resin bobbin 14 having a through hole 16 serving as a flow path through which the measurement object 8 flows, an excitation coil 20 and a detection coil 18 wound around the outer periphery of the bobbin 14. The evaluation unit 30 is connected in series with the amplifier to the magnetic sensor unit 12, and when a phase difference occurs between the input waveform to the excitation coil and the output waveform from the detection coil, the frequency is changed to compensate for the phase difference to zero. The relationship between the amount of change in frequency when the phase difference is compensated to zero and the amount of magnetization of the measurement object 8 is obtained in advance, and the measurement object 8 is placed in the flow path passing through the magnetic sensor unit 12. The amount of magnetization of the measuring object 8 is evaluated from the amount of frequency change that compensates for the phase difference that occurs when the current flows.
[Selection] Figure 1

Description

  The present invention relates to a magnetization evaluation apparatus, and more particularly to a magnetization evaluation apparatus that evaluates the magnetization of a fluid.

  The possibility that magnetism affects the health of the human body has been described in various aspects. For example, it is a bracelet using a magnet, a magnetic pellet or the like to be attached to a location such as a muscle lump. And magnetizing water is also performed.

  For example, Patent Document 1 discloses a configuration of a magnetization chamber in which a magnetizer having a permanent magnet and a yoke is arranged as a device for applying magnetism to water flowing in a pipe and magnetizing it.

  As disclosed in Patent Document 2, the inventor of the present application inserts a measurement object into an air core portion of an excitation coil and a detection coil arranged in a predetermined positional relationship, and a displacement amount that is an insertion depth thereof. We are developing a method that can measure with high accuracy by using the phase shift method. This technique uses the fact that the inductance of the excitation coil and the detection coil changes as the measurement object is inserted into the air core. That is, when a phase difference that occurs in response to a change in inductance occurs between the output signal from the detection coil and the input signal to the excitation coil, the phase difference is reduced to zero by changing the frequency using the phase shift circuit. The amount of change in inductance is obtained from the amount of change in frequency that compensates and compensates for the phase difference to zero. By obtaining in advance the correspondence between the displacement of the measurement object and the inductance, or the relationship between the measurement object and the frequency change amount, the displacement of the measurement object can be obtained with high accuracy.

JP 2005-40694 A JP 2003-139562 A

  In addition to Patent Document 1, many inventions such as an apparatus for producing magnetized water are disclosed. However, in the magnetized water production apparatus, even if magnetism is supplied to water, there are few means for evaluating whether water has been magnetized. Currently used magnetic sensors include MI sensors, SQUIDs, and high-sensitivity magnetoresistive elements, but problems remain due to sensitivity, resolution, miniaturization, and the like. Although the method of Patent Document 2 can accurately measure a change in inductance, it is for displacement detection and not for magnetization detection.

  An object of the present invention is to provide a magnetization evaluation apparatus capable of evaluating the magnetization of a fluid.

  A magnetization evaluation apparatus according to the present invention is arranged around a flow path through which a measurement object flows, and is connected in series with a magnetic sensor unit having an excitation coil and a detection coil together with an amplifier to the magnetic sensor unit. When there is a phase difference between the input waveform and the output waveform from the detection coil, the phase shift circuit that compensates the phase difference by changing the frequency to zero, the amount of frequency change when the phase difference is compensated to zero, and the measurement target The relationship between the amount of magnetization of the object is obtained in advance, and the amount of magnetization of the object to be measured is evaluated from the amount of frequency change that compensates for the phase difference that occurs when the object to be measured flows through the flow path passing through the magnetic sensor unit. And a magnetization amount evaluation unit.

  In the magnetization evaluation apparatus according to the present invention, it is preferable that the excitation coil and the detection coil are connected in series with their polarities wound in opposite directions.

  Further, the magnetization amount measuring unit preferably sets a threshold frequency change amount for evaluating the presence / absence of magnetization, and when the frequency change amount is less than the threshold frequency change amount, it is preferable to evaluate that the measurement object is not magnetized. .

  According to the magnetization evaluation apparatus according to the present invention, the relationship between the amount of change in frequency and the amount of magnetization of the measurement object when the phase difference is compensated to zero in the phase shift method is obtained in advance, and the flow path passes through the magnetic sensor unit. The amount of magnetization of the measurement object is evaluated from the amount of change in frequency that compensates for the phase difference that occurs when the measurement object is passed through to zero. Therefore, the magnetization of the fluid can be evaluated.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following, water will be described as a measurement object. However, other than water, a fluid containing water as a main component, for example, water containing additives, drainage, alcoholic beverages, biological fluids, blood, etc. may be used as the measurement object. Good. The dimensions, structures, and the like described below are examples for explanation, and can be appropriately changed according to the application.

  FIG. 1 is a diagram showing a configuration of the magnetization evaluation apparatus 10. In FIG. 1, water that is the measurement object 8 is shown although it is not a component of the magnetization evaluation apparatus 10. The magnetization evaluation apparatus 10 is an apparatus that evaluates the magnetization of water, which is a fluid, as a measurement object. In particular, it is an apparatus for evaluating the magnetization of water that is magnetized by applying magnetism to water.

  The magnetization evaluation apparatus 10 includes a magnetic sensor unit 12 having an air-core coil configuration and an evaluation unit 30 that is connected to the magnetic sensor unit 12 and evaluates the magnetization amount of the measurement object 8. The magnetic sensor unit 12 includes a resin bobbin 14 having a through hole 16 serving as a flow path through which the measurement object 8 flows, an excitation coil 20 and a detection coil 18 wound around the outer periphery of the bobbin 14.

  As the exciting coil 20 and the detecting coil 18, a conductor wire that is covered with insulation and wound around the bobbin 14 with a predetermined number of turns can be used. Preferably, the excitation coil 20 and the detection coil 18 have the same electrical characteristics such as inductance. For example, a conductor wire of the same thickness and the same material is used, and the same number of turns is wound around the outer periphery of the bobbin 14 having the same winding diameter. The winding directions are preferably connected in series with opposite polarities. The reverse polarity means that, as shown in FIG. 1, if one of the directions wound around the central axis of the bobbin 14 is clockwise, the other is counterclockwise. The connection point may be grounded and may not be set to a special potential while being connected.

  An example of the dimensions of the magnetic sensor unit 12 will be described. The bobbin 14 is made of a resin whose outer diameter is about 40 mm, the axial length is about 40 mm, the inner diameter is about 25 mm, and the coil winding thickness is about 1 mm. It is. The diameter of the winding, the number of turns, etc. were appropriately selected so as to satisfy the above conditions.

  As described above, by using coils having the same electrical characteristics and winding them in series with the polarity reversed, the magnetic balance around the central axis of the bobbin 14 can be accurately taken. As a result, the change in the magnetic characteristics of the measurement object 8 flowing through the through hole 16 of the bobbin 14 can be detected with high accuracy by the composite coil in which the excitation coil 20 and the detection coil 18 are integrated.

  FIG. 2 is a diagram illustrating an internal configuration of the evaluation unit 30. The evaluation unit 30 includes a terminal 32 that receives an output signal from the detection coil 18, a terminal 34 that outputs an input signal to the excitation coil 20, and a terminal 36 that outputs a magnetic evaluation result. The interior of the evaluation unit 30 is configured as follows.

  A terminal 32 connected to the detection coil 18 is connected to the amplifier 40 via a suitable DC cut capacitor. The amplifier 40 is an electronic circuit that appropriately amplifies the signal detected by the detection coil 18, and a well-known amplifier circuit can be used.

  The output of the amplifier 40 is input to the phase shift circuit 42, and the output of the phase shift circuit 42 is connected to the excitation coil 20 via the terminal 34. Therefore, when the measurement object 8 flows through the air core of the excitation coil 20 and the detection coil 18, the closed loop of the excitation coil 20- (measurement object 8) -detection coil 18-amplifier 40-phase shift circuit 42-excitation coil 20 is closed. Is configured. In this closed loop, an electrical signal that vibrates weakly depending on the physical properties of the measurement object 8 flows. Accordingly, by appropriately setting the contents of the phase shift circuit 42, self-excited oscillation can be generated for the weak vibration electric signal in the closed loop.

  The function of the phase shift circuit 42 is to change the resonance frequency of the closed loop by changing the resonance frequency of the closed loop when a phase difference occurs between the input signal input to the phase shift circuit 42 and the output signal output. It has a function to compensate for the phase difference to zero. Then, the frequency when the phase difference is compensated to zero is output to the frequency change amount calculation unit 44.

The frequency change amount calculation unit 44 includes a closed-loop oscillation frequency f ₁ when self-excited oscillation occurs due to the action of the phase shift circuit 42 when the measurement object 8 is not included in the closed loop, and the measurement object 8 is included in the closed loop. And receiving a closed-loop oscillation frequency f ₂ when self-excited oscillation occurs due to the action of the phase shift circuit 42, and calculating Δf = f ₂ −f ₁ which is a frequency change amount between them. . That is, the function of the frequency change amount calculation unit 44 detects the oscillation frequency f ₁ when the measurement object 8 is not included in the closed loop, that is, when the measurement object 8 is not flowing, from the closed loop, and temporarily detects this. Next, when the measurement object 8 is included in the closed loop, that is, when the measurement object 8 is flown, the oscillation frequency f ₂ when the measurement object 8 is flown is detected from the closed loop, and this is also temporarily stored, and the two stored frequencies f A series of processes of reading ₁ and f ₂ and calculating a frequency change amount which is a difference between them is performed.

In the example of FIGS. 1 and 2, the self-excited oscillation frequency f ₁ in the closed loop when the sample water that is the measurement object 8 is not flowed, and the self-excitation in the closed loop when the sample water that is the measurement object 8 is flowed. Δf = f ₂ −f _1, which is a frequency change amount between the oscillation frequencies f ₂ , is obtained by the frequency change amount calculation unit 44 and output to the magnetization amount evaluation unit 46. The specific configuration and detailed operation of the phase shift circuit 42 are disclosed in Patent Document 2 described above.

  The phase shift circuit 42 changes the frequency of the closed loop when a phase difference occurs between the output signal from the detection coil 18 and the input signal to the excitation coil 20 in order to maintain closed loop self-excited oscillation. The phase difference is compensated to zero. Therefore, as for the frequency of the closed-loop self-excited oscillation, the difference in the physical properties of the measurement object 8 can be easily detected when the frequency change amount when the phase difference is compensated to zero is large. Therefore, the circuit constant which is the circuit content of the phase shift circuit 42 is set such that the amount of change in frequency when the phase difference is compensated to zero for the target closed loop becomes a stable oscillation frequency. Generally speaking, there are many resonance frequencies in the frequency-phase characteristics of the magnetic sensor unit 12. Among them, the oscillation is stable, and if the phase difference is changed, a frequency change of an appropriate magnitude is obtained. A resonance frequency that satisfies the condition of occurrence is selected, and a circuit constant of the phase shift circuit 42 is set for the selected resonance frequency.

The magnetization amount evaluation unit 46 has a function of evaluating the magnetization amount of the measurement object 8 based on the frequency change amount output from the frequency change amount calculation unit 44. In order to evaluate the magnetization amount of the measurement object 8 from the frequency change amount, a relationship between the frequency change amount and the magnetization amount of the measurement object 8 is obtained in advance, and the relationship is calculated by the frequency change amount calculation unit 44. It is executed by applying the frequency change amount. In the magnetization amount evaluation, the relative magnetization amount of the measurement object 8 may be calculated and output as the magnetization amount. Further, a threshold frequency change amount f ₀ for evaluating the presence / absence of magnetization is set in advance, and when the frequency change amount is less than the threshold frequency change amount f _0, a threshold determination is performed to evaluate that the measurement object 8 is not magnetized. It may be a thing.

  FIG. 3 shows the relationship between the amount of change in frequency that compensates for the phase difference that occurs when the sample water that is the measurement object 8 flows through the magnetic sensor unit 12 and the magnetization amount of the sample water that is the measurement object 8. It is a figure explaining the mode of the experimental system 50 to obtain | require. The experimental system 50 includes an upper tank 52 that accommodates raw water 6 for producing sample water that is the measurement object 8, a three-way valve 54, and a magnetizing device 56 that produces sample water that is the measurement object 8 from the raw water 6. 1 and FIG. 2, and a lower tank 60 that stores water that has flowed through the magnetization evaluation device 10.

  The magnetizing device 56 applies an electric field in a direction perpendicular to the direction of the magnetic field formed by the container in which the raw water 6 is flowed, the pair of permanent magnets disposed in the container and the pair of permanent magnets facing each other. For this purpose, it is provided with a pair of electrodes arranged opposite to each other, and is configured to flow the raw water 6 in a direction perpendicular to the direction of the magnetic field and perpendicular to the direction of the electric field. With this configuration, Lorentz force defined by the flowing direction of the raw water 6, the direction of the magnetic field, and the direction of the electric field acts, whereby the raw water 6 is magnetized and becomes sample water of the measurement object 8. The strength of the magnetic field and the strength of the electric field by the permanent magnet pair were appropriately determined by experiments.

  The three-way valve 54 passes the evaluation water evaluation direction in which the raw water 6 flows from the upper tank 52 via the magnetization device 56 to the magnetization evaluation device 10 and directly from the upper tank 52 to the magnetization evaluation device 10 without passing through the magnetization device 56. It is a fluid switching valve that switches between raw water evaluation directions for flowing raw water.

In FIG. 4, two kinds of raw tap water and pure water are used as the raw water 6, and the two kinds of raw water 6 are magnetized by the magnetizing device 56 to obtain sample water of the measurement object 8. It is the result of having calculated | required frequency variation | change_quantity (DELTA) f about the sample water which is the target object 8 with the magnetization evaluation apparatus 10 demonstrated in FIG. 1, FIG.

As can be seen from FIG. 4, pure water has a small frequency change Δf and is not easily magnetized. On the other hand, tap water has a considerable difference in frequency change Δf between raw water and sample water that has passed through the magnetizing device 56. This difference sufficiently exceeds the measurement error of the frequency change amount Δf. Therefore, it is possible to determine whether it is magnetized water or raw water by setting an appropriate threshold frequency change amount Δf ₀ . In addition, the degree of magnetization of the sample water can be quantitatively measured by obtaining a correlation between the magnetization intensity in the magnetizing device 56 and the frequency change amount Δf.

  In FIG. 4, what is indicated as 25φ and 6φ is the diameter of the through hole 16 of the bobbin 14 described in FIG. It can be seen that as the diameter of the through hole 16 is increased, the frequency change amount Δf is increased.

Therefore, by storing the correspondence as shown in FIG. 4 in a memory or the like in advance, the magnetization of the measuring object 8 can be evaluated by the magnetization evaluation apparatus 10 shown in FIG. The value of the threshold frequency change amount Δf ₀ or the correspondence relationship “Δf−magnetization amount” is stored as a type in which the presence or absence of magnetization is output by inputting Δf or a type in which the magnetization amount is output. Specifically, it may be stored in the form of a conversion table such as a lookup table, or may be stored in the form of a comparison expression or a calculation expression.

It is a figure which shows the structure of the magnetization evaluation apparatus in embodiment which concerns on this invention. In embodiment concerning this invention, it is a figure which shows the internal structure of an evaluation part. In embodiment which concerns on this invention, it is a figure which shows the structure of the experimental system for calculating | requiring previously the relationship between a frequency variation and magnetization. In embodiment which concerns on this invention, it is a figure which shows the example of the relationship between a frequency variation | change_quantity and magnetization.

Explanation of symbols

  6 Raw water, 8 Measurement object, 10 Magnetization evaluation device, 12 Magnetic sensor unit, 14 Bobbin, 16 Through hole, 18 Detection coil, 20 Excitation coil, 30 Evaluation unit, 32, 34, 36 terminals, 40 Amplifier, 42 Phase shift Circuit, 44 Frequency change amount calculation unit, 46 Magnetization amount evaluation unit, 50 Experimental system, 52 Upper tank, 54 Three-way valve, 56 Magnetization device, 60 Lower tank

Claims (3)

A magnetic sensor unit disposed around a flow path through which a measurement object flows and having an excitation coil and a detection coil;
A phase shift circuit that is connected in series with the amplifier to the magnetic sensor unit, and when the phase difference occurs between the input waveform to the excitation coil and the output waveform from the detection coil, changes the frequency to compensate for the phase difference to zero, and
The relationship between the amount of change in frequency when the phase difference is compensated to zero and the amount of magnetization of the object to be measured is obtained in advance, and the phase difference that occurs when the object to be measured flows through the flow path passing through the magnetic sensor unit is made zero. A magnetization amount evaluation unit that evaluates the magnetization amount of the measurement object from the amount of frequency change to be compensated;
A magnetization evaluation apparatus comprising: The magnetization evaluation apparatus according to claim 1,
The magnetization evaluation apparatus, wherein the excitation coil and the detection coil are wound in opposite directions and connected in series. The magnetization evaluation apparatus according to claim 1,
The magnetization amount measuring unit presets a threshold frequency change amount for evaluating the presence or absence of magnetization, and evaluates that the measurement object is not magnetized when the frequency change amount is less than the threshold frequency change amount. Magnetization evaluation device.

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