JP2018173330A - Device for measuring component amount of substance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for measuring the component amount of an object, in which the sensitivity of measuring an object is improved.SOLUTION: The present invention is constituted so that a detection unit K comprises an excitation circuit 1 equipped with an exciting element 3 having a wound coil 2 and causing a magnetic flux to be generated by this exciting element 3, a detection resonance circuit 10 having a wound coil 12 and detecting an output amount pertaining to an induced electromotive force that is outputted to the coil 12 of a detection element 13 by the magnetic flux generated by the exciting element 3, and an adjustment resonance circuit 30 equipped with an adjustment element 33 having a wound coil 32 and outputting an induced electromotive force to the coil 32 of the adjustment element 33 by the magnetic flux generated by the excitation circuit 1. The excitation element 3, the detection element 13 and the adjustment element 33 are superposed, with the dense faces of the coils opposed, and a stage 40 where an object W to be detected is arranged is provided on the dense face 15 side of the detection element 13. A component amount pertaining to a specific component of the object W is calculated by a control unit on the basis of the output amount detected by the detection resonance circuit 10.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an object component amount measuring apparatus that measures a component amount related to a specific component of an object in a non-destructive manner, and more particularly to an object component amount measuring apparatus that measures a component amount of a test object by an electromagnetic induction method. .

  Conventionally, as a component amount measuring apparatus of this type of object, for example, a technique described in Japanese Patent Laid-Open No. 2003-194960 (Patent Document 1) is known. As shown in FIG. 21, this component amount measuring device Sa measures the amount of water that is a specific component of the object W, and includes an exciter 103 having a coil 102 wound around a rod-shaped core 101. The exciting body 103 includes an exciting circuit 100 that applies a predetermined alternating voltage to the coil 102 of the exciting body 103 to generate a magnetic flux in the exciting body 103, and a coil 112 wound around a rod-shaped core 111. And a detection resonance circuit 110 that detects an induced electromotive voltage output to the coil 112 of the detection body 113 by the magnetic flux generated by the excitation body 103 and includes the coupled detection body 113, and the core 101 of the excitation body 103 Based on the voltage detected by the detection resonance circuit 110, the object W to be tested is exposed to the magnetic flux generated between the end portion 101a and the end portion 111a of the core 111 of the detection body 113. It is to measure the amount.

JP 2003-194960 A

However, in the conventional component amount measuring apparatus Sa, the object W to be tested is generated between the end 101a of the core 101 of the exciter 103 and the end 111a of the core 111 of the detector 113. Since it faces the generated magnetic flux, there is a problem that the measurement sensitivity of the object W is inferior due to an air gap generated between the end portions 101a and 111a of the cores 101 and 111.
The present invention has been made in view of the above points, and an object of the present invention is to provide an object component amount measuring apparatus that improves the measurement sensitivity of an object.

An object component amount measuring apparatus of the present invention for achieving such an object includes a detection unit and a control unit, and the detection unit includes an exciter having a wound coil. An excitation circuit that applies a predetermined AC voltage to the coil to generate magnetic flux in the exciter and a detector that has a wound coil and is magnetically coupled to the exciter are generated by the exciter. And a detection resonance circuit for detecting an output amount related to the induced electromotive force output to the coil of the detection body by the generated magnetic flux, and the detection unit generates the excitation body and the detection body. In an object component amount measuring apparatus that faces an object to be tested in a magnetic flux and calculates a component amount related to a specific component of the object based on an output amount detected by the detection resonance circuit in the control unit. ,
The excitation body and the detection body of the detection unit are formed with a dense surface where the wound coils are densely exposed, and the excitation surface is opposed to the dense surface of the detection body. And a stage on which the object to be examined is arranged is provided, and the stage is provided along the dense surface of the detector.

Here, the object is a solid, liquid, gas, or a mixture of these, and can measure components such as moisture and molten material from a decrease in induced electromotive force and a phase change that occur in the detection resonance circuit. Anything is acceptable.
The output amount related to the induced electromotive force relates to the complex induced electromotive force, and can include, for example, the induced electromotive voltage and its phase. In the control unit, for example, a component amount related to a specific component of the object can be calculated based on a change amount of the induced electromotive voltage or a phase difference. The amount of change in the induced electromotive voltage can be, for example, the ratio of the induced voltage when there is an object on the stage relative to the reference of the induced electromotive voltage with reference to the induced voltage in a state where there is no object on the stage. The phase difference is the difference in the phase of the induced voltage when there is an object on the stage relative to the reference phase of the induced electromotive voltage.For example, the phase difference of the induced voltage when there is no object on the stage is used as a reference. The phase difference of the phase of the induced voltage when the object is on the stage with respect to the reference phase of the induced electromotive voltage can be used.

  In this configuration, the dense surface of the exciter and the dense surface of the detector may be joined via an insulator, or may be spaced apart from each other at a required interval. The stage may be composed of a dense surface of the detection body, or may be composed of a dedicated member such as a plastic sheet or a plate. In the case of using a dedicated member, it may be joined to the dense surface of the detection body, or may be separated from the dense surface of the detection body by a required distance.

  As a result, when measuring the amount of a component related to a specific component of the object, if the object to be tested is placed on the stage and an AC voltage is applied by the excitation circuit, the magnetic flux is generated in the coil of the exciter. A part of this magnetic flux is transmitted through the detection body of the detection resonance circuit, and an induced electromotive force is output to the coil. Since the object to be tested faces the magnetic flux generated in the exciter and the detector, the capacitance changes and the resonance frequency shifts to a lower side, causing a change in resonance characteristics and impedance. As a result, the voltage and current change to change the magnetic flux and the degree of magnetic coupling changes, and the output amount related to the induced electromotive force is detected in the detection resonance circuit. In the control unit, the component amount related to a specific component of the object is measured based on the output amount. In this case, since the dense surface of the excitation body and the dense surface of the detection body are opposed to each other, the excitation body and the detection body are overlapped, and the stage is provided along the dense surface of the detection body. There is no gap in the transmitted magnetic flux, so that the measurement sensitivity is improved.

  In the present invention, it is effective that at least the detection body is configured in such a manner that the coil is wound in a plate shape with the required width around the central axis and along the central axis direction, and the front and back surfaces are formed as dense surfaces. It is. Since the detection body is plate-shaped, the area of the dense surface of the coil, that is, the contact area with the subject increases. As a result, the difference in electrostatic capacitance (floating capacitance) between the presence and absence of the subject (air) is large, so that the measurement sensitivity can be improved compared to when the contact area is small. .

  Further, in the present invention, at least the detection body is formed by winding a coil in a spiral shape around a central axis orthogonal to the plane on a plane, and the front and back surfaces orthogonal to the central axis are configured as dense surfaces. It is effective to have configured. Since the detection body is plate-shaped, the area of the dense surface of the coil, that is, the contact area with the subject increases. As a result, the difference in electrostatic capacitance (floating capacitance) between the presence and absence of the subject (air) is large, so that the measurement sensitivity can be improved compared to when the contact area is small. . Further, since the coil is formed in a spiral shape, the manufacture becomes easy.

  In the present invention, it is effective to form at least one of the excitation body and the detection body by winding a coil around a core. Since it is wound around the core, the magnetic coupling can be easily controlled.

Furthermore, in the present invention, it is effective that at least one of the exciter and the detector is provided with a plurality of wound coil assemblies.
Thereby, the component distribution of the subject can be easily measured.

  In the present invention, if necessary, the detection unit includes an adjustment body having a wound coil, and an induced electromotive force is output to the coil of the adjustment body by the magnetic flux generated by the excitation circuit. An adjustment resonance circuit is provided, and the adjustment body is formed to have a dense surface where the wound coils are densely exposed, and the dense surface of the adjustment body is formed as a dense surface of the exciter and / or the detection body. The adjustment body is superposed on the excitation body and / or detection body so as to face the dense surface and is magnetically coupled to the excitation body and detection body.

  In this configuration, the dense surface of the adjusting body may be joined to the dense surface of the exciter and / or the dense surface of the detector through an insulator, or may be spaced apart from each other by a predetermined distance. Thereby, since the adjustment body is provided, the output amount from the coil of the detection body can be adjusted, and the sensitivity can be improved by controlling the frequency characteristics of the amplitude and phase of the reception voltage. A plurality of adjustment bodies may be provided.

  In the configuration including the adjustment body, at least the detection body is wound in a plate shape so that the coil has a required width around the central axis and in the central axis direction, and the front and back surfaces are configured as dense surfaces. Is effective. Since the detection body is plate-shaped, the area of the dense surface of the coil, that is, the contact area with the subject increases. As a result, the difference in electrostatic capacitance (floating capacitance) between the presence and absence of the subject (air) is large, so that the measurement sensitivity can be improved compared to when the contact area is small. .

  In the configuration including the adjustment body, at least the detection body is formed by winding the coil in a spiral shape around the central axis orthogonal to the plane on the plane, and the front and back surfaces orthogonal to the central axis are formed. It can be configured as a dense surface. Since the detection body is plate-shaped, the area of the dense surface of the coil, that is, the contact area with the subject increases. As a result, the difference in electrostatic capacitance (floating capacitance) between the presence and absence of the subject (air) is large, so that the measurement sensitivity can be improved compared to when the contact area is small. . Further, since the coil is formed in a spiral shape, the manufacture becomes easy.

  In the configuration including the adjusting body, it is effective to form at least one of the exciting body, the detecting body, and the adjusting body by winding a coil around the core. Since it is wound around the core, the magnetic coupling can be easily controlled.

Furthermore, in the configuration provided with the adjustment body, it is effective that at least one of the excitation body, the detection body, and the adjustment body includes a plurality of wound coil assemblies.
Thereby, the component distribution of the subject can be easily measured.

  In addition, in the present invention, a configuration in which the detection unit including the adjustment resonance circuit and another detection unit not including the adjustment resonance circuit can be selectively used according to the measurement range of the component amount, as necessary. It is said. Depending on the properties of the object to be tested, a detection unit with an adjustment resonance circuit and another detection unit without an adjustment resonance circuit can be used separately to measure the component amount with higher accuracy. can do.

In order to achieve the above object, an object component amount measuring apparatus of the present invention includes a detection unit and a control unit, and the detection unit includes an exciter having a wound coil. An excitation circuit that applies a predetermined AC voltage to the coil to generate magnetic flux in the exciter and a detector that has a wound coil and is magnetically coupled to the exciter are generated by the exciter. And a detection resonance circuit for detecting an output amount related to the induced electromotive force output to the coil of the detection body by the generated magnetic flux, and the detection unit generates the excitation body and the detection body. In an object component amount measuring apparatus that faces an object to be tested in a magnetic flux and calculates a component amount related to a specific component of the object based on an output amount detected by the detection resonance circuit in the control unit. ,
The excitation body comprises a coil wound in a cylindrical shape and a rod-shaped core made of a magnetic material having one end inserted through the coil,
The detection body is configured by a coil wound in a cylindrical shape on the other end side of the core and spaced from the core and coaxial with the core and having a dense outer peripheral surface;
The excitation body, the core, and the detection body are positioned so that the object to be tested covers a part or all of the dense surface of the detection body from the outside, and the output amount output to the coil by the detection body is detected. The configuration is such that it is supported by a support.

  Also by this, since the object to be examined covers a part or all of the dense surface of the detection body from the outside, there is no gap in the magnetic flux passing through the object, and therefore the measurement sensitivity is improved. In addition, by using a rod-shaped core, measurement is possible even at a measurement unit that is remote from the transmission unit.

In order to achieve the above object, an object component amount measuring apparatus of the present invention includes a detection unit and a control unit, and the detection unit includes an exciter having a wound coil. An excitation circuit that applies a predetermined AC voltage to the coil to generate magnetic flux in the exciter and a detector that has a wound coil and is magnetically coupled to the exciter are generated by the exciter. And a detection resonance circuit for detecting an output amount related to the induced electromotive force output to the coil of the detection body by the generated magnetic flux, and the detection unit generates the excitation body and the detection body. In an object component amount measuring apparatus that faces an object to be tested in a magnetic flux and calculates a component amount related to a specific component of the object based on an output amount detected by the detection resonance circuit in the control unit. ,
The exciter and the detector are formed in a cylindrical shape with a coil wound around the outer peripheral surface, the exciter is inserted coaxially into the detector, and the exciter and detector are tested. The target object is positioned so as to cover a part or all of the dense surface of the detection body from the outside, and the output amount output to the coil by the detection body is supported on the support body so that it can be detected.
Also by this, since the object to be examined covers a part or all of the dense surface of the detection body from the outside, there is no gap in the magnetic flux passing through the object, and therefore the measurement sensitivity is improved.

  In this case, an adjustment resonance circuit that includes an adjustment body having a wound coil and outputs an induced electromotive force to the coil of the adjustment body by the magnetic flux generated by the excitation circuit is provided. It can be configured to be wound to form a cylindrical shape with the outer peripheral surface being a dense surface, and to be coaxially inserted into the detection body and supported by the support. Thereby, since the adjustment body is provided, the output amount from the coil of the detection body can be adjusted, and the sensitivity can be improved by controlling the frequency characteristics of the amplitude and phase of the reception voltage.

  In addition, if necessary, the control unit obtains the induction component which is obtained in advance for a sample object having a known component amount related to the specific component and is output to the coil of the detection body of the detection resonance circuit for the specific component of the sample object. Correlation storage means for storing correlations related to power, and component amount calculation means for calculating a component quantity related to a specific component of the object based on the output amount detected by the detection resonance circuit and the correlation stored by the correlation storage means And comprising.

  According to the present invention, since the object to be tested is located on the dense surface of the coil of the detection body, there is no gap in the magnetic flux passing through the object, and therefore the measurement sensitivity can be improved. In addition, in the case of using a rod-shaped core, measurement is possible even at a measurement unit away from the transmission unit.

It is a block diagram which shows the component amount measuring apparatus of the object which concerns on embodiment of this invention. It is a figure which shows the structure of a detection part in the component amount measuring apparatus of the object which concerns on embodiment of this invention. It is a figure which shows the structure of the excitation body of a detection part, a detection body, and an adjustment body in the component amount measuring apparatus of the object which concerns on embodiment of this invention, (a) is a front view, (b) It is a side view. It is a figure which shows the structure of another detection part in the component amount measuring apparatus of the object which concerns on embodiment of this invention. It is a figure which shows the detection principle of the detection part of this invention. In the detection part of this invention, it is a figure which shows the difference with the detection part provided with the adjustment resonance circuit, and the detection part which is not provided with the adjustment resonance circuit. It is a flowchart at the time of measuring the component of an object with the component amount measuring apparatus of the object which concerns on embodiment of this invention. It is a figure which shows another example of a detection part in the component amount measuring apparatus of the object which concerns on embodiment of this invention. The modification of the excitation body of a detection part, a detection body, and an adjustment body is shown in the component amount measuring apparatus of the object which concerns on embodiment of this invention, (a) is a front view, (b) is a side view. In the component amount measuring apparatus for an object according to the embodiment of the present invention, another modification of the exciter, detector and adjuster of the detector is shown, (a) is a front view and (b) is a side view. It is a figure which shows another example of the excitation body of a detection part, a detection body, and an adjustment body in the component amount measuring apparatus of the object which concerns on embodiment of this invention. It is a figure which shows another example of the exciting body of a detection part, a detection body, and an adjustment body in the component amount measuring apparatus of the object which concerns on embodiment of this invention. In the component amount measuring apparatus for an object according to the embodiment of the present invention, another exciter and a detector are shown, (a) is a front view, and (b) is a side view. It is a figure which shows the detection part of the component amount measuring apparatus of the object which concerns on another embodiment of this invention, (a) is a front view, (b) is a left view, (c) is a right view. The state at the time of measuring the component of an object using the detection part of the component amount measuring apparatus of the object which concerns on another embodiment of this invention is shown, (a) is a perspective view which shows the relationship with an object, (b). FIG. 5 is a cross-sectional view showing a state during measurement of an object. It is a figure which shows the detection part of the component amount measuring apparatus of the object which concerns on another embodiment of this invention, (a) is front sectional drawing, (b) is a right view. It is a figure which shows the detection part of the component amount measuring apparatus which concerns on the Example of this invention, (a) is a top view, (b) is a front view. In the component amount measuring apparatus according to the embodiment of the present invention, a calibration curve related to measurement by a detection unit including an adjustment resonance circuit is shown together with a calibration curve related to measurement by a detection unit not including the adjustment resonance circuit. The graph which shows the relationship between a water | moisture content and a voltage, (b) is a graph which shows the relationship between a water | moisture content and a phase difference. In the detection part of the component amount measuring apparatus which concerns on another Example of this invention, (a) is a figure which shows the structure, (b) shows the relationship between a water | moisture content and a voltage, and the relationship between a water | moisture content and a phase difference. FIG. In the component amount measuring apparatus which concerns on the Example of this invention, the calibration curve about salted seaweed is shown, (a) is a graph which shows the relationship between a moisture content and a voltage, (b) is the relationship between a moisture content and a phase difference. (C) is a graph showing the relationship between the salinity and the voltage, and (d) is a graph showing the relationship between the salinity and the phase difference. It is a figure which shows an example of the conventional component amount measuring apparatus.

  Hereinafter, an object component amount measuring apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIGS. 1 to 3, the object component amount measuring apparatus S according to the embodiment includes a detection unit K and a control unit C. The detection unit K includes an exciter 3 having a wound coil 2, an excitation circuit 1 that applies a predetermined AC voltage to the coil of the exciter 3 and generates a magnetic flux in the exciter 3, and a winding And a detection body 13 that is magnetically coupled to the exciter 3 and has an induced electromotive force that is output to the coil 12 of the detector 13 by the magnetic flux generated by the exciter 3. The detection resonance circuit 10 for detecting the output amount is provided. The detection unit K causes the object W to be tested to face the magnetic flux generated in the exciter 3 and the detection unit 13, and the control unit C detects the output. The component amount related to a specific component of the object W is calculated based on the output amount detected by the resonance circuit 10.

  In the excitation circuit 1, the exciter 3 is formed in a plate shape having dense surfaces 5 and 6 where the wound coil 2 is densely exposed as shown in FIG. 3. The coil 2 is wound in a plate shape with a required width L around the central axis P and along the direction of the central axis P, and the area of the aggregate of the coils 2 wound in the plate shape. Wide flat front and back surfaces are formed as dense surfaces 5 and 6. The coil 2 has a known configuration in which a conductive wire is covered with an insulator, and is wound around a rectangular plate-shaped core 4. The core 4 may be wound without being particularly provided. When wound around the core 4, the magnetic coupling can be easily controlled. As shown in FIGS. 1 and 2, the excitation circuit 1 is a transmitter having a coil 2 (excitation coil) wound with an exciter 3 and a sine wave transmission circuit 8 that applies a voltage to the coil 2 from a power source. 7.

  In the detection resonance circuit 10, as shown in FIG. 3, the detection body 13 is formed in the same manner as the excitation body 3, and is formed in a plate shape having dense surfaces 15 and 16 where the wound coil 12 is densely exposed. Has been. The coil 12 is wound in a plate shape with a required width L around the center axis P and along the direction of the center axis P, and the area of the aggregate of the coils 12 wound in the plate shape is Wide flat front and back surfaces are formed as dense surfaces 15 and 16. The coil 12 has a known structure in which a conductive wire is covered with an insulator, and is wound around a rectangular plate-shaped core 14. The core 14 may be wound without being particularly provided. When wound around the core 4, the magnetic coupling can be easily controlled.

  As shown in FIGS. 1 and 2, the detection resonance circuit 10 is generated by a coil 12 (detection coil) wound with a detection body 13, a capacitor 17 connected to the coil 12, and the excitation body 3. And a receiver 20 that detects an output amount related to the induced electromotive force output to the coil 12 of the detection body 13 by magnetic flux. The receiver 20 includes an amplitude maximum value detection circuit 21 that detects the maximum amplitude of the voltage as an output amount, a phase detection circuit 22 that detects a phase of the voltage as an output amount, an amplitude maximum value detection circuit 21, and a phase detection circuit 22. And an A / D converter 23 that converts the analog electric signal from the digital signal into a digital electric signal and outputs the digital electric signal.

  The detection unit K includes an adjustment body 33 having a wound coil 32, and an adjustment resonance circuit 30 that outputs an induced electromotive force to the coil of the adjustment body 33 by the magnetic flux generated by the excitation circuit 1. Yes. In the adjustment resonance circuit 30, the adjustment body 33 is formed in the same manner as the excitation body 3, as shown in FIG. 3, and is formed in a plate shape having dense surfaces 35 and 36 where the wound coil 32 is densely exposed. Has been. The coil 32 is wound in a plate shape with a required width L around the central axis P and along the direction of the central axis P, and the area of the aggregate of the coils 2 wound in the plate shape is reduced. Wide flat front and back surfaces are formed as dense surfaces 35 and 36. The coil 2 has a known configuration in which a conductive wire is covered with an insulator, and is wound around a rectangular plate-shaped core 34. The core 34 may be wound without being particularly provided. When wound around the core 4, the magnetic coupling can be easily controlled. As shown in FIG. 2, the adjustment resonance circuit 30 includes a coil 32 wound with an adjustment body 33 and a capacitor 37 connected to the coil 32.

  And the exciting body 3, the detection body 13, and the adjustment body 33 are formed in substantially the same size. The exciter 3 and the detector 13 are superposed with the dense surface 5 on the surface of the exciter 3 and the dense surface 16 on the back surface of the detector 13 facing each other. The adjustment body 33 is superimposed on the excitation body 3 and / or the detection body 13 such that the dense surface of the adjustment body 33 faces the dense surface of the excitation body 3 and / or the detection surface of the detection body 13. 3 and the detector 13 are magnetically coupled. In the embodiment, the adjustment body 33 is interposed between the excitation body 3 and the detection body 13, and the dense surface 35 on the surface of the adjustment body 33 is opposed to the dense surface 16 on the back surface of the detection body 13. The dense surface 36 on the back surface of the adjustment body 33 is opposed to the dense surface 5 on the surface of the exciter 3. The intervals between the exciter 3, the detector 13, and the adjuster 33 are appropriately determined and supported by a base not shown. If necessary, an insulating plate such as plastic is interposed between the exciter 3 and the adjuster 33 and between the adjuster 33 and the detector 13. The magnetic coupling between the exciter 3, the detector 13 and the adjustment body 33 in advance is adjusted by adjusting the distance between the exciter 3, the detector 13 and the adjustment body 33 and the capacitance of the capacitor 37 of the adjustment resonance circuit 30. Adjust the degree.

  Furthermore, the present apparatus S includes a stage 40 on which an object W to be examined is placed. The stage 40 is formed of, for example, a plastic sheet, and is provided on the dense surface 15 side of the surface of the detection body 13. In the embodiment, the detection body 13 is superposed on the dense surface 15 on the surface of the detection body 13. That is, the excitation body 3, the detection body 13, the adjustment body 33, and the stage 40 have dense surfaces 5, 6, 15, 16, 35, 36 parallel to each other, and these dense surfaces 5, 6, 15, 16, 35, Is superposed in one direction R (vertical direction in the embodiment) orthogonal to 36. The stage 40 may be formed in a container shape having a side wall, and its bottom surface may be superimposed on the dense surface 15 on the surface of the detection body 13 so as to accommodate the object W to be examined.

  Further, the apparatus S includes a detection unit K (A) including the adjustment resonance circuit 30 illustrated in FIG. 2 and another detection unit K (B) not including the adjustment resonance circuit 30 illustrated in FIG. It can be selectively used depending on the measurement range of the component amount. As shown in FIG. 4, another detection unit K (B) that does not include the adjustment resonance circuit 30 has a configuration in which the adjustment resonance circuit 30 is excluded from the configuration of the detection unit K that includes the adjustment resonance circuit 30 described above. The adjustment body 33 is not provided, and the interval between the excitation body 3 and the detection body 13 is appropriately determined and supported by a base not shown. As necessary, an insulating plate such as plastic is interposed between the exciter 3 and the detector 13. The degree of magnetic coupling between the exciter 3 and the detector 13 is adjusted in advance by adjusting the interval between the exciter 3 and the detector 13.

  Furthermore, as shown in FIG. 1, the apparatus S includes a control unit C that calculates a component amount related to a specific component of the object W. The control unit C is realized by a function such as a CPU and a memory, and is obtained in advance in a sample object W with a known component amount related to a specific component. The specific component of the sample object W is detected by the detection body 13 of the detection resonance circuit 10. Correlation storage means 50 for storing the correlation related to the induced electromotive force output to the coil 12, the output amount detected by the detection resonance circuit 10, and a specific component of the object W based on the correlation stored in the correlation storage means 50 A component amount calculating means 51 for calculating the component amount is provided.

  Specifically, the correlation storage means 50 uses the specific component of the sample object W and the induced voltage in the state where the object W is not on the stage 40 as a reference, and induces the object when the object is on the stage 40 with respect to the reference of the induced electromotive voltage. The correlation (calibration curve) with the amount of change (ratio) of the voltage is stored, and the reference of this induced electromotive voltage is determined based on the phase of the specific component of the sample object W and the induced voltage when there is no object on the stage 40. The correlation (calibration curve) with the phase difference of the phase of the induced voltage when the object is on the stage 40 with respect to the phase of.

  As shown in FIG. 1, the control unit C uses the maximum amplitude of the induced voltage in a state where the object W is not on the stage 40 as a reference from the maximum amplitude of the voltage from the amplitude maximum value detection circuit 21. Based on the amplitude change amount calculation means 52 for calculating the change amount (ratio) in the maximum amplitude of the induced voltage when the object W is on the stage 40 with respect to the reference of the maximum amplitude, and the phase of the voltage from the phase detection circuit 22, Phase difference calculating means 53 for calculating the phase difference of the phase of the induced voltage when there is an object on the stage with respect to the phase of the induced voltage with reference to the phase of the induced voltage when no object is present. Yes.

  Then, the component amount calculation unit 51 calculates a component amount related to a specific component of the object W based on the correlation stored in the correlation storage unit 50 from the calculation result of the amplitude change amount calculation unit 52. Further, the component amount relating to a specific component of the object W is calculated from the calculation result of the phase difference calculating unit 53 based on the correlation stored in the correlation storage unit 50. In addition, the apparatus S includes a display unit 54 that displays the calculation result of the component amount calculation unit 51 and a printer (not shown) that outputs the calculation result.

  As the specific component of the object, for example, in the case of the moisture content, as shown in an example described later, as shown in FIG. A calibration curve of the ratio normalized reception voltage (when 1) is created. Alternatively, as shown in FIG. 18B, a calibration curve for the amount of change in phase with respect to the amount of moisture in the sample object W (based on the phase of air) is created. The correlation storage means 50 stores the relationship of the calibration curve.

  Here, the detection principle in the detection resonance circuit 10 will be described with reference to FIGS. 5 and 6. For example, the case where moisture is used as the component amount will be described. As shown in FIG. 5A, when the sample object W does not contain moisture, the resonance frequency of the detection resonance circuit 10 and the resonance frequency of the adjustment resonance circuit 30 are the same value. At this time, the frequency characteristic of the received voltage is a unimodal characteristic. As shown in FIG. 5B, when the sample object W contains moisture, the capacitance on the detection resonance circuit 10 side is increased, and the resonance frequency of the detection circuit 10 is shifted to the lower side. The frequency characteristic of the received voltage at this time is a bimodal characteristic with a shallow valley. The resonance frequency of the adjustment resonance circuit 30 is fixed and does not change regardless of the amount of components such as water. Further, as shown in FIG. 5C, when the moisture of the sample object W increases, the capacitance further increases, and the resonance frequency of the detection resonance circuit 10 shifts to a lower side. At this time, the frequency characteristic of the received voltage is a deep bimodal characteristic.

  That is, when the sample object W contains no moisture, the frequency characteristic has a steep phase gradient in the frequency band. When the sample object W contains moisture, this inclination shifts to a lower frequency, and the inclination becomes smaller and has a gentle characteristic. Further, when the moisture of the sample object W increases, the phase shifts further toward the lower frequency while the phase gradient becomes gentler. In the above received voltage and phase characteristics, if the measurement frequency is fm, the received voltage and phase can be level-differed between when there is a lot of moisture and when there is little moisture. This level difference is the measurement range, and it is possible to know the amount of moisture by knowing which value is within this range.

  As shown in FIG. 6, when the adjusted resonance circuit 30 is not used and when it is used, the waveform has a large slope when the adjusted resonance circuit 30 is not used as shown in FIG. Therefore, the measurement limit is reached immediately. However, as shown in FIG. 6B, when the adjustment resonance circuit 30 is used, the adjustment becomes a gentle slope, so that the measurement limit is not reached even with the same frequency shift amount. Although there is room for measurement and the measurement resolution is lowered, the measurement range can be expanded.

Therefore, when the component amount related to a specific component of the object W is measured by the component amount measuring apparatus S, the following description will be given using the flowchart shown in FIG.
First, the case where the detection part K provided with the adjustment resonance circuit 30 is used is demonstrated. In advance, the voltage and the phase of the voltage are measured without the object W on the stage 40. When an AC voltage is applied by the excitation circuit 1 (S1), a magnetic flux is generated in the excitation body 3 (S2), and the detection unit K includes the adjustment resonance circuit 30 (S3 Yes), so that the magnetic flux is applied to the coil 32 of the adjustment body 33. (S4), a part of the magnetic flux passes through the detection body 13 of the detection resonance circuit 10 and an induced electromotive force is output to the coil 12 (S5). Since there is no object W to be examined (S6 No), the phase detection circuit 22 of the detection resonance circuit 10 stores the reference amplitude and phase of the detected voltage (S7).

  In this state, the object W to be examined is placed on the stage 40 and the amount of the component is measured. Similarly to the above, when an AC voltage is applied by the excitation circuit 1 (S1), a magnetic flux is generated in the excitation body 3 (S2), and the detection unit K includes the adjustment resonance circuit 30 (S3 Yes). A magnetic flux is generated in the coil (S4), and a part of the magnetic flux passes through the detection body 13 of the detection resonance circuit 10 and an induced electromotive force is output to the coil 32 (S5). Then, since there is an object W to be examined this time (S6 Yes), that is, the object W to be examined faces in the magnetic flux generated by the exciter 3 and the detector 13, so that the magnetic flux changes. To change the amplitude and the phase of the voltage (S8). Thus, the maximum amplitude value detection circuit 21 detects and processes the maximum amplitude value as an output amount (S9, S10), and outputs it to the control unit C via the A / D converter 23 (S12). On the other hand, the phase detection circuit 22 detects the phase difference from the reference phase as an output amount (S9, S11), and outputs it to the control unit C via the A / D converter 23 (S12). In the control unit C, the output from the A / D converter 23 is temporarily stored (S13).

  In this case, the dense surface 5 of the excitation body 3 and the dense surface 16 of the detection body 13 are opposed to each other, the excitation body 3 and the detection body 13 are overlapped, and a stage 40 is provided on the other dense surface 15 side of the detection body 13. Therefore, there is no gap in the magnetic flux that passes through the object W on the stage 40, so that the measurement sensitivity is improved. Moreover, since the adjustment body 33 is provided, the output amount from the coil 12 of the detection body 13 can be adjusted, and the sensitivity can be improved by controlling the characteristics.

Then, in the control unit C, the amplitude change amount calculation means 52 uses the induced voltage when no object is present on the stage from the maximum amplitude of the voltage from the amplitude maximum value detection circuit 21 as a reference, and the reference of this induced electromotive voltage. The amount of change (ratio) of the induced voltage when there is an object on the stage is calculated (S14). The phase difference calculation means 53 uses the phase of the voltage from the phase detection circuit 22 as a reference to the phase of the induced voltage when no object is on the stage, and the object is on the stage with respect to the reference phase of the induced electromotive voltage. The phase difference of the phase of the induced voltage at a certain time is calculated (S14).
Then, the component amount calculating unit 51 calculates a component amount related to a specific component of the object W based on the correlation stored in the correlation storage unit 50 from the calculation result of the amplitude change amount calculating unit 52 (S15). Further, the component amount related to a specific component of the object W is calculated from the calculation result of the phase difference calculation unit 53 based on the correlation stored in the correlation storage unit 50 (S15). The calculation result of the component amount calculation means 51 is displayed on the display unit 54 (S16) or output by a printer. There are two types of component amount output, but either one may be configured to output, or the data may be integrated and output.

  On the other hand, when another detection unit K that does not include the adjustment resonance circuit 30 is used, the voltage and the phase of the voltage are measured in advance without the object W on the stage 40 in the same manner as described above. When an AC voltage is applied by the excitation circuit 1 (S1), a magnetic flux is generated in the exciter 3 (S2), and the detection unit K does not include the adjustment resonance circuit 30 (S3 No). The induced electromotive force is output to the coil 12 through the detection body 13 of the circuit 10 (S5). Since there is no object W to be examined (S6 No), the phase detection circuit 22 of the detection resonance circuit 10 stores the reference amplitude and phase of the detected voltage (S7).

  In this state, the object W to be examined is placed on the stage 40 and the amount of the component is measured. Similarly to the above, when an AC voltage is applied by the excitation circuit 1 (S1), a magnetic flux is generated in the excitation body 3 (S2), and the detection unit K does not include the adjustment resonance circuit 30 (S3 No). The part passes through the detection body 13 of the detection resonance circuit 10 and an induced electromotive force is output to the coil 12 (S5). Then, since there is an object W to be examined this time (S6 Yes), that is, the object W to be examined faces in the magnetic flux generated by the exciter 3 and the detector 13, so that the magnetic flux changes. To change the amplitude and the phase of the voltage (S8). Subsequent processes change in the same manner as described above. For this reason, according to the property of the object W to be examined, the detection unit K (A) provided with the adjustment resonance circuit 30 and another detection unit K (B) not provided with the adjustment resonance circuit 30 are selectively used. By using it, the component amount can be measured with higher accuracy.

  FIG. 8 shows another example of the detection unit K. This is configured in the same manner as the detection unit K including the adjustment resonance circuit 30 described above, but the position of the adjustment body 33 is different from the above. That is, the adjustment body 33 is provided on the dense surface 6 side of the back surface of the excitation body 3, and the dense surface 35 on the surface of the adjustment body 33 is opposed to the dense surface 6 on the back surface of the excitation body 3. The dense surface 5 on the surface of the detector is opposed to the dense surface 16 on the back surface of the detection body 13. This also provides the same operations and effects as described above.

  Next, modified examples of the excitation body 3, the detection body 13, and the adjustment body 33 will be described. In FIG. 9, flat coils 2, 12, and 32 are formed by etching on cores 4, 14, and 34 made of a substrate, and the front and back coils 2, 12, and 32 have through-hole conductors 68. Connected through. That is, the coils 2, 12, and 32 are wound around the cores 4, 14, and 34 around the central axis P and formed in a plate shape, and the front and back surfaces are dense surfaces (5, 15, 35), (6, 16, 36). Has the same effects and effects as above.

  The coil shown in FIG. 10 is formed by winding the coils 2, 12, and 32 in a spiral shape around a central axis P orthogonal to the plane, and the front and back surfaces orthogonal to the central axis P are dense surfaces (5 , 15, 35), (6, 16, 36). As shown in a test example to be described later, FIG. 19 shows an example of the component amount measuring apparatus S of the object W using the exciter 3, the detector 13, and the adjuster 33 according to this configuration. According to this, even if the gap d between the detection body 13 and the stage 40 is large, it can respond.

  The excitation body 3, the detection body 13, and the adjustment body 33 shown in FIG. 11 include a plurality of assemblies 60 of wound coils 2, 12, and 32. The assembly 60 is assembled in a matrix on the substrate 69 constituting the core (4, 14, 34) as in FIG.

  The excitation body 3, the detection body 13, and the adjustment body 33 shown in FIG. 12 are configured by including a plurality of assemblies 60 of wound coils 2, 12, and 32 in a matrix. Each assembly 60 is formed by forming coils 2, 12, and 32 in a spiral shape around the central axis by etching a support plate 63 as a substrate.

  FIG. 13 shows another exciter 3 and detector 13. This is a combination of the exciter 3 and the detector 13, and the core 7 is formed in a flat ring shape with a magnetic material such as ferrite, and has a pair of flat portions 64a and 64b facing each other, The coils 2 and 12 are wound around the flat portions 64 a and 64 b, respectively, and one flat portion 64 a and the coil 2 are configured as the exciter 3, and the other flat portion 64 b and the coil 12 are configured as the detection body 13. .

  In addition, the combination of the excitation body 3, the detection body 13, and the adjustment body 33 may not be a combination of the same form. For example, the exciter 3 is a plate-shaped core wound with a coil (FIG. 9), and the detector 13 is provided with a plurality of coil assemblies 60 having the same size as the exciter 3 (FIG. 11). It can be changed as appropriate.

  FIG. 14 shows a detection unit K of a component amount measuring apparatus for an object W according to another embodiment. In this structure, the exciter 3 includes a coil 2 wound in a cylindrical shape and a rod-shaped core 70 made of a magnetic material inserted into the coil 2 at one end side. The other end side is separated from the core 70 and is arranged coaxially with the core 70 and is formed of a coil 12 wound in a cylindrical shape having an outer peripheral surface as a dense surface 71, and the exciter 3, the core 70, and the detector 13. Is positioned so that the object W to be examined covers a part or all of the dense surface 71 of the detection body 13 from the outside, and the support body 73 can detect the output amount output to the coil 12 by the detection body 13. It is what I supported.

  Therefore, when using this component amount measuring apparatus S, as shown in FIG. 15, a hole Wa through which the support 73 is inserted is formed in an object W made of, for example, wood, and the support is provided in the hole Wa. 73 is inserted so that the object W to be examined covers the entire dense surface 71 of the detection body 13 from the outside. Also by this, since the object W to be examined covers the entire dense surface 71 of the detection body 13 from the outside, there is no gap in the magnetic flux that passes through the object W, so that the measurement sensitivity is improved. In addition, by using the rod-shaped core 70, measurement can be performed even at a measurement unit away from the transmission unit.

  FIG. 16 illustrates a detection unit K of a component amount measurement apparatus for an object W according to another embodiment. In this configuration, the detection body 13, the excitation body 3 and the adjustment body 33 are formed in a cylindrical shape in which the coils 2, 12, 32 are wound and the entire outer peripheral surface is a dense surface. The coils 2, 12, and 32 are wound around cylindrical cores 4, 14, and 34 supported by the support body 73. The inner diameter of the detection body 13 is set larger than the outer diameter of the excitation body 3, the inner diameter of the excitation body 3 is set larger than the outer diameter of the adjustment body 33, and the excitation body 3 and the adjustment body 33 are coaxial with the detection body 13. Insert and configure. When using the component amount measuring apparatus S using the detection body 13, as shown in FIG. 15, a hole Wa through which the detection body 13 is inserted into an object W made of wood, for example, to be tested is formed. The detection body 13 is inserted into Wa so that the object W to be examined covers the entire dense surface of the detection body 13 from the outside. Also by this, the object W to be inspected covers the entire dense surface of the detection body 13 from the outside, so that no gap is generated in the magnetic flux passing through the object W, and therefore the measurement sensitivity is improved.

Next, an example is shown.
FIG. 17 shows an apparatus configuration. In this apparatus, a detection unit K (A) having the same adjustment resonance circuit 30 as shown in FIG. 2 and another detection unit K (B) not having the same adjustment resonance circuit 30 as shown in FIG. It was created. In the detection unit K, the excitation body 3, the detection body 13, and the adjustment body 33 are configured in the same manner as shown in FIG. 10, and the coil is formed by etching a line pattern on a double-sided printed board and the pattern ends on both sides are through holes. Made through. As for the size of the exciter 3, the detector 13, and the adjuster 33, the thickness t of the core is 2 mm, the length is 500 mm, and the width is 300 mm. The excitation body 3, the detection body 13 and the adjustment body 33 are provided on the base 80, and a resin plate 81 is interposed between the detection body 13 and the adjustment body 33. The stage 40 was formed in a container shape by using a resin sheet 82 attached to the detection body 13 and surrounding the periphery with a side wall 83. The side wall 83 was also covered with the resin sheet 82. The container dimensions are 700 mm long, 500 mm wide, and 150 mm deep.

Using this apparatus, the test object was paper containing moisture, and the moisture content of the paper was tested. A calibration curve was created by changing the output amount to voltage and phase difference, and changing the water content.
FIG. 18 shows the test results of the apparatus using the detection unit K that does not include the adjustment resonance circuit 30 and the test results of the apparatus that uses the detection unit K that includes the adjustment resonance circuit 30.

  Therefore, when the adjustment resonance circuit 30 is not used, the measurement resolution in the region where the water content is 40% by weight or less is about 1.3 times better for the received voltage and about 1.2 times better for the phase difference. Is possible. On the other hand, in the region where the amount of moisture is greater than 40% by weight, the measurement resolution is better when the adjustment resonance circuit 30 is used. The reception voltage is about 10 times better, and the phase resolution is about 1.5 times better. Therefore, it is advantageous that the adjustment resonance circuit 30 is not used for measurement in the region where the moisture amount is 40% by weight or less, and that the adjustment resonance circuit 30 is more advantageous in the region where the moisture amount is more than 40% by weight. I understood. That is, when the moisture amount is 0 to 40% by weight, the resolution of the device using the detection unit K not including the adjustment resonance circuit 30 is high, and when the moisture amount exceeds 40% by weight, the detection including the adjustment resonance circuit 30 is performed. It was found that the resolution of the apparatus using the part K is high, and it is good to use properly according to the properties of the test object.

  Next, another embodiment is shown. As shown in FIG. 19, this is a component amount measuring apparatus S provided with a detecting unit K using an exciting body 3, a detecting body 13 and an adjusting body 33 wound in the same spiral shape as shown in FIG. . The coils of the exciter 3, the detector 13, and the adjuster 33 were made of a copper wire with a diameter of 1.8 mm and a spiral shape with a diameter of about 150 mm. Using this apparatus, the test object was paper containing moisture, and the moisture content of the paper was tested. In particular, the gap d was verified. The result is shown in FIG. From this result, it was found that measurement was possible even when the detection coil and the test object were separated by 5 mm. That is, it can be seen that in the region where the moisture content is 20 wt% to 70 wt%, the received voltage and the phase difference both monotonously decrease and can be sufficiently measured even at a distance of 5 mm from the test object. .

<Test example>
Using the apparatus shown in FIG. 17, measurement was performed using a salted seaweed as a measurement sample, and a calibration curve for the amount of water (weight in the measurement area) and the amount of salt (weight in the measurement area) was obtained. The result is shown in FIG. In any of FIGS. 20A and 20B, a calibration curve can be created by a function of a polynomial, and the moisture amount (weight in the measurement area) and the amount of salt (weight in the measurement area) can be estimated using this.

  In the above embodiment, the configuration of the detection unit K is not limited to that described above, and can be changed as appropriate if the object W to be tested is provided on the dense surface side of the detection body 13. There is no problem. Needless to say, the subject to be examined and the component to be measured may be anything.

  According to the present invention, for example, it is extremely useful for quality control of various objects W including processed fishery products such as salted seaweed, shiitake mushrooms, and noodles.

S Component measuring device W Object (test object)
K detector C controller 1 excitation circuit 2 coil (excitation coil)
3 Exciter 4 Core 5, 6 Dense surface 7 Transmitter 8 Sine wave transmission circuit 10 Detection resonance circuit 12 Coil (detection coil)
13 Detector 14 Core 15, 16 Dense surface 17 Capacitor 20 Receiver 21 Amplitude maximum value detection circuit 22 Phase detection circuit 23 A / D converter 30 Adjustment resonance circuit 32 Coil (adjustment coil)
33 Adjustment body 34 Core 35, 36 Dense surface 37 Capacitor 40 Stage 50 Correlation storage means 51 Component amount calculation means 52 Amplitude change amount calculation means 53 Phase difference calculation means 54 Display part 60 Assembly 63 Support plate 64 Cores 64a, 64b Flat part 70 Core 71 Dense surface 73 Support 80 Base 81 Resin plate 82 Resin sheet 83 Side wall

Claims (15)

An excitation circuit including a detection unit and a control unit, the excitation unit including an excitation body having a wound coil, and applying a predetermined AC voltage to the coil of the excitation body to generate a magnetic flux in the excitation body And a detection body having a wound coil and magnetically coupled to the exciter, and an output related to the induced electromotive force output to the coil of the detector by the magnetic flux generated by the exciter. And a detection resonance circuit for detecting the force level. The detection unit causes the object to be tested to face within the magnetic flux generated in the excitation body and the detection body, and the control unit detects the detection resonance. In an object component amount measuring apparatus that calculates a component amount related to a specific component of the object based on an output amount detected by a circuit,
The excitation body and the detection body of the detection unit are formed with a dense surface where the wound coils are densely exposed, and the excitation surface is opposed to the dense surface of the detection body. And an object component amount measuring apparatus, comprising: a stage on which the object to be tested is arranged; and the stage is provided along a dense surface of the object to be detected.   2. The object according to claim 1, wherein at least the detection body is configured such that the coil is wound in a plate shape so as to have a required width in the center axis direction with the center axis as a center, and the front and back surfaces are configured as a dense surface. Component amount measuring device.   At least the detection body is formed by winding a coil in a spiral shape around a central axis orthogonal to the plane on a plane, and the front and back surfaces orthogonal to the central axis are configured as dense surfaces. Item 1. The component amount measuring apparatus for an object according to Item 1. 4. The object component amount measuring apparatus according to claim 1, wherein at least one of the excitation body and the detection body is formed by winding a coil around a core.
  5. The object component amount measuring apparatus according to claim 1, wherein at least one of the excitation body and the detection body includes a plurality of wound coil assemblies.   The detection unit is provided with an adjustment resonance circuit that includes an adjustment body having a wound coil and outputs an induced electromotive force to the coil of the adjustment body by a magnetic flux generated by the excitation circuit, and the adjustment body is The wound coil is formed to have a dense surface that is densely exposed, and the dense body of the adjustment body is opposed to the dense surface of the exciter and / or the dense surface of the detector. 2. The component amount measuring apparatus for an object according to claim 1, wherein the device is superposed on an exciter and / or a detector and is magnetically coupled to the exciter and the detector.   The object according to claim 6, wherein at least the detection body is configured by winding a coil in a plate shape so as to have a required width in the center axis direction with the center axis as a center, and the front and back surfaces are configured as a dense surface. Component amount measuring device.   At least the detection body is formed by winding a coil in a spiral shape around a central axis orthogonal to the plane on a plane, and the front and back surfaces orthogonal to the central axis are configured as dense surfaces. Item 7. The component amount measuring apparatus for an object according to Item 6.   9. The object component amount measuring apparatus according to claim 6, wherein at least one of the excitation body, the detection body, and the adjustment body is formed by winding a coil around a core.   10. The object component amount measuring apparatus according to claim 6, wherein at least one of the excitation body, the detection body, and the adjustment body includes a plurality of wound coil assemblies. .   11. The detection unit including the adjustment resonance circuit and another detection unit not including the adjustment resonance circuit can be selected and used according to a component amount measurement range. The component amount measuring apparatus of the object described. An excitation circuit including a detection unit and a control unit, the excitation unit including an excitation body having a wound coil, and applying a predetermined AC voltage to the coil of the excitation body to generate a magnetic flux in the excitation body And a detection body having a wound coil and magnetically coupled to the exciter, and an output related to the induced electromotive force output to the coil of the detector by the magnetic flux generated by the exciter. And a detection resonance circuit for detecting the force level. The detection unit causes the object to be tested to face within the magnetic flux generated in the excitation body and the detection body, and the control unit detects the detection resonance. In an object component amount measuring apparatus that calculates a component amount related to a specific component of the object based on an output amount detected by a circuit,
The excitation body comprises a coil wound in a cylindrical shape and a rod-shaped core made of a magnetic material having one end inserted through the coil,
The detection body is configured by a coil wound in a cylindrical shape on the other end side of the core and spaced from the core and coaxial with the core and having a dense outer peripheral surface;
The excitation body, the core, and the detection body are positioned so that the object to be tested covers a part or all of the dense surface of the detection body from the outside, and the output amount output to the coil by the detection body is detected. An apparatus for measuring a component amount of an object, wherein the apparatus is supported by a support. An excitation circuit including a detection unit and a control unit, the excitation unit including an excitation body having a wound coil, and applying a predetermined AC voltage to the coil of the excitation body to generate a magnetic flux in the excitation body And a detection body having a wound coil and magnetically coupled to the exciter, and an output related to the induced electromotive force output to the coil of the detector by the magnetic flux generated by the exciter. And a detection resonance circuit for detecting the force level. The detection unit causes the object to be tested to face within the magnetic flux generated in the excitation body and the detection body, and the control unit detects the detection resonance. In an object component amount measuring apparatus that calculates a component amount related to a specific component of the object based on an output amount detected by a circuit,
The exciter and the detector are formed in a cylindrical shape with a coil wound around the outer peripheral surface, the exciter is inserted coaxially into the detector, and the exciter and detector are tested. The target object is positioned so as to cover a part or all of the dense surface of the detection body from the outside, and the output amount output to the coil by the detection body is supported on the support body so that it can be detected. Device for measuring the amount of components in objects.   An adjustment resonance circuit that outputs an induced electromotive force to the coil of the adjustment body by the magnetic flux generated by the excitation circuit is provided, and the adjustment body is wound around the coil. The object component amount measuring apparatus according to claim 13, wherein the object component amount measuring apparatus is formed in a cylindrical shape having a dense outer peripheral surface, and is coaxially inserted into the detection body and supported by a support.   The control unit is obtained in advance for a sample object having a known component amount related to a specific component, and relates to the specific component of the sample object and the induced electromotive force detected by the detection resonance circuit and output to the coil of the detection body. Correlation storage means for storing a correlation with the output amount; and component amount calculation means for calculating a component amount relating to a specific component of the object from the output amount detected by the detection resonance circuit and the correlation stored by the correlation storage means 15. The component amount measuring apparatus for an object according to any one of claims 1 to 14, characterized by comprising:

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