JPS6225248A - Instrument for measuring mixing ratio of mixture of dielectric material to be measured - Google Patents

Abstract

PURPOSE:To measure the moisture contained in a material to be measured or the concn. thereof in real time regardless of the characteristics thereof by introducing the material to be measured into the position where an influence is given to the stray capacity between the LC resonance circuit itself and a detection coil and detecting the change of the stray capacity. CONSTITUTION:The C-component of an LC resonator 2 coupled to the output of an oscillator 1 is the stray capacity 3 and the detection coil is so provided that the coil is L-coupled to a coil 5 and is C-coupled thereto through the stray capacity 8 between said coils. A vessel 4 consisting of an insulator having a low dielectric constant is provided to the position where the influence is given to both of the stray capacities 3, 8. The electrostatic capacity of the resonance circuit changes and the resonance frequency changes as well when the dielectric material to be measured is inserted into the vessel 4. The stray coupling capacity 8 also changes at the same instant and the value of a voltage display means 7 which displays the voltage detected from the coil 6 changes as well. The relation of the resonance frequency and peak voltage with the mixing ratio of a known sample is compared with the displayed value, by which the content is known.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a measuring device in a broad sense, and particularly to a device for measuring the mixing ratio of a mixture of objects to be measured. .

Specifically, in the LC resonant circuit connected to the output of one oscillator, the difference in permittivity of the object to be measured is expressed as a difference in resonance frequency, and this allows the mixing ratio of the object to be measured to be determined. This invention relates to a measuring device that allows extremely simple measurements. and,
By changing the stray capacitance of the dielectric substance that is the object to be measured, the mixture ratio of the object to be measured is measured.

[Conventional technology]

Conventionally, this type of measuring instrument has been a contact type measuring instrument that measures an object by inserting an electrode or the like into the object to be measured, such as a liquid.

Furthermore, as non-contact measuring instruments of this kind, there have conventionally been those using the electromagnetic induction method or those using a cavity resonator as disclosed in Japanese Patent Publication No. 58-30534.

[Problems to be solved by the present invention]

However, with the contact type measuring device, since the probe comes into contact with the object to be measured, the measured value may change due to reasons such as the probe itself being contaminated by the object to be measured or undergoing chemical changes. Therefore, it was not durable.

On the other hand, although the conventional non-contact measuring instruments mentioned above have solved the problems of the above-mentioned contact-type measuring instruments, in the case of electromagnetic induction method, they have high conductivity due to the presence of highly acidic or alkaline industrial wastewater, etc. Although it is suitable for measuring liquids, it is not suitable for measuring liquids with low conductivity, and furthermore, it is not suitable for measuring objects other than liquids, such as granular or powdery substances. .

In addition, the measuring device disclosed in Japanese Patent Publication No. 5B-30534 is not a contact type and therefore does not have this drawback, but the objects it can measure are limited to sheet-like solid objects such as paper, liquids, In any case, it has been completely impossible to measure various objects to be measured other than sheet-like solid objects, such as powdery materials, granular materials, viscous materials, etc.

[Means for solving problems]

In view of the above points, the aA dielectric analyte mixture mixing ratio measuring device according to the present invention has solved various inconveniences of the conventional measuring devices, and is extremely superior as a non-contact measuring device. It brings out the best of both worlds.

That is, since the measuring device of the present invention uses dielectric constant, unlike conventional non-contact type devices, the measuring device itself can be measured not only in liquids and solids, but also in solid sheets. It greatly expands the scope of application to objects to be measured, such as powdered, granular, or viscous materials, and can also measure not only the water content of various mixtures but also their concentration. real time·
It is also possible to perform online measurement processing.

The specific configuration of the device for measuring the mixture ratio of a dielectric object to be measured according to the present invention will be described below.

First, in the present invention, there is an oscillator and an LCJt: oscillator coupled to the output of the oscillator, and the resonance circuit 0 minute of this LC resonator uses the stray capacitance of the coil itself of this resonance circuit. . Furthermore, this device is provided with a detection coil that is L-coupled to the coil of the LC resonator and C-coupled to this through stray capacitance, and
Voltage display means is provided for displaying the voltage detected from the detection coil.

Finally, this device installs an appropriate dielectric object to be measured at a position that affects both the stray capacitance of the LC resonant circuit itself and the stray capacitance between the LC resonant circuit and the detection coil. It is configured to do so.

[Operation of the present invention]

Based on the above configuration, the device for measuring the mixture ratio of a dielectric object to be measured according to the present invention produces the following effects.

In the present invention, an oscillator oscillates at a constant frequency, and the output of the oscillator is coupled to an LC resonator. and,
The floating fog rU of the LC resonant circuit coupled to the output of this oscillator
Since the structure is such that a dielectric object to be measured is installed at a position that affects both the LC resonance circuit and the stray capacitance between the LC resonant circuit and the detection coil, This will change the stray capacitance.

In other words, if a mixture of substances (object to be measured) with different aA conductors is placed in a place that affects the stray capacitance, the capacitance of the resonant circuit will change depending on the overall dielectric constant, and the resonant frequency will also change. At the same time, the floating coupling container between the resonant circuit coil and the detection coil also changes, causing the value on the high frequency voltmeter to change as well.

Therefore, what is displayed on the voltage display means is compared with a graph or numerical table showing the relationship between the resonance frequency and the peak voltage at resonance with respect to the mixture ratio of a known material made of the same material as the object to be measured. This makes it possible to know the unknown mixing ratio (content rate) of the object to be measured.

[Example of the present invention]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The apparatus for measuring the mixture ratio of a dielectric object to be measured according to the present invention will be described in detail below using one embodiment and accompanying drawings showing the embodiment.

FIG. 1 is a schematic wiring diagram of an embodiment of the device for measuring the mixture ratio of a dielectric object to be measured according to the present invention.

First, there is an oscillator l, the output of which is coupled to an LC resonator 2. 0 minutes of the above L Cju shaker 2 is,
This utilizes stray capacitance 3. Further, a detection coil 6 is provided to be L-coupled to the coil 5 of the LC resonator 2, and C-coupled thereto through stray capacitance. A voltage display means 7, such as a digital type, for displaying the voltage detected from the detection coil 6 is provided.

Finally, at a position where the conductive object to be measured affects both the stray capacitance 3 of the LCC resonant circuit itself and the stray capacitance 8 between the LC resonant circuit 2 and the detection coil 6,
A container 4 made of an insulator with an extremely low dielectric constant is provided.

The container 4 may have any shape, for example, a pipe shape or a box shape as shown in the front sectional view of the container portion shown in FIG. 2.

- The container 4 is configured such that an appropriate dielectric object to be measured is inserted into or passed through the container 4.

In addition, on the Kinomi style side, the container 4 is not limited to whether it is pipe-shaped or box-shaped with a bottom, but the term "container" in English includes all things that store things. It has an extremely broad meaning.

Therefore, as shown in FIG. 1, the outlet container 4 is made of a bubble 1' 4a made of an insulator with an extremely low dielectric constant.
The 3A heavy object to be measured is IIT! Of course, it also includes those configured to be able to use iA.

Therefore, this enables online, real-time measurement processing of the object to be measured. That is, while the object to be measured is continuously passed through the pipe 4a, information such as the output voltage and resonance frequency of the unequipped device is continuously transmitted to the microcomputer (programmed with graphs or numerical tables to be compared). This is possible by entering the .

Furthermore, the measurement results can be fed back to the supply source of the object to be measured to perform control such as keeping the content of the object at a constant value.

On the other hand, this container 4 is, for example, shaped like a test tube, and this is an integrated device that includes various circuits and accessories, and the coil 5 can be connected to the coil 5 by simply inserting the test tube therein. It is extremely convenient for various tests if the test tube is placed in the predetermined position of 6 so that after testing that sample, it can be replaced with the next test tube containing another sample (see Figure 3).

In this embodiment, the voltage display means 7 is, for example, a high frequency voltmeter, but if the object to be measured is rough, a light emitting diode or the like may be used to determine the peak value of the resonant voltage at the resonant frequency. Then, it is convenient and low cost.

Further, in this embodiment, the high frequency voltmeter is displayed digitally, but it goes without saying that the high frequency voltmeter may be displayed analogously depending on the type of the object to be measured.

Furthermore, in this embodiment, the oscillator l is, for example, an LC oscillator or an RC oscillator.

Depending on the object to be measured, a crystal oscillator with several stages may be used and switched by a switch.In any case, the oscillator itself in this device is not particularly limited to this. Instead, any type of oscillator may be used.

Note that the resonant frequency may be determined by the scale provided on the oscillator l, but in cases where precision is required,
It is better to prepare a frequency discriminator separately.If a swept frequency oscillator is used as the oscillator and an oscilloscope is used in place of the frequency discriminator and high frequency voltmeter, voltage and resonance frequency can be measured at the same time.

C. Effects of the present invention] Since the device for measuring the mixture ratio of a dielectric object to be measured according to the present invention has the above-described configuration, as long as the object to be measured is dielectric, it can be used not only for liquids and solids, but also for liquids and solids. It is possible to measure solids regardless of their shape, and it has become possible to measure a wide variety of objects, including powders, granules, viscous substances, etc.

Therefore, as shown in the table shown in FIG. 4, the resonant voltage versus resonant frequency characteristic of the measuring device according to the present invention appears almost constant because the resonant voltage changes little with respect to changes in the dielectric constant of the object to be measured. The apparatus of the present invention is suitable for measuring various objects to be measured as described above.

This measuring device is particularly advantageous when the object to be measured is a non-electrolyte or non-conductive substance.

Here, the device for measuring the mixture ratio of a dielectric material to be measured according to the present invention not only fully exhibits the effects of the above-mentioned embodiments described above, but is also an extremely novel and excellent measuring device. .

[Brief explanation of drawings]

Fig. 1 is a schematic wiring diagram showing one embodiment of the device for measuring the mixture ratio of a dielectric object to be measured according to the present invention, and Fig. 2 is a schematic wiring diagram showing an example of the device for measuring the mixture ratio of a dielectric object to be measured according to the present invention. FIG. 3 is a front sectional view showing one embodiment, FIG. 3 is a perspective view showing another embodiment, and FIG. 4 is a diagram showing the resonant voltage versus resonant frequency characteristic of the measuring device according to the present invention. Symbols in the figure l-φ・LC oscillator, 2...-LC resonator, 3.8...
- Stray capacitance, 4... Container, 4a-Φ, pipe, 5, Participating coil, 6, Detecting coil, 7... Voltage display means.

Claims (11)

[Claims] (1) An oscillator, an LC resonant circuit coupled to the output of the oscillator, and the C component of the resonant circuit is L-coupled to the coil of the LC resonant circuit, which utilizes the stray capacitance of this coil, and this. A detection coil C-coupled to the LC through the stray capacitance of the LC resonant circuit, a voltage display means for displaying the voltage from the detection coil, and a stray capacitance of the LC resonant circuit itself and the LC.
A mixture of dielectric objects to be measured, characterized in that the dielectric objects to be measured are arranged in a position that affects the stray capacitance between the resonant circuit and the detection coil. Ratio measuring device. (2) A container made of an insulator with an extremely low dielectric constant is provided at a position that affects the stray capacitance of the LC resonant circuit itself and the stray capacitance between the LC resonant circuit and the detection coil, and the container is 2. An apparatus for measuring a mixture ratio of a dielectric object to be measured as claimed in claim 1, wherein the device is configured such that a dielectric object to be measured is placed therein. (3) A pipe made of an insulator with an extremely low dielectric constant is provided at a position that affects the stray capacitance of the LC resonant circuit itself and the stray capacitance between the LC resonant circuit and the detection coil, and the pipe is 3. An apparatus for measuring a mixture ratio of a dielectric object to be measured according to claim 2, characterized in that the device is configured such that the dielectric object to be measured is allowed to pass therethrough. (4) The device for measuring a mixture ratio of a dielectric object to be measured as set forth in claim 2, wherein the container formed of an insulating material having an extremely low dielectric constant is box-shaped. (5) The device for measuring the mixture ratio of a dielectric object to be measured as set forth in claim 2, wherein the container formed of an insulating material having an extremely low dielectric constant is in the shape of a test tube. (6) The device for measuring the mixture ratio of a dielectric object to be measured as set forth in claim 1, wherein the voltage display means is a high-frequency voltmeter. (7) The device for measuring a mixture ratio of a dielectric object to be measured as set forth in claim 6, wherein the high frequency voltmeter is digitally displayed. (8) An apparatus for measuring a mixture ratio of a dielectric object to be measured according to claim 6, wherein the high-frequency voltmeter displays an analog display. (9) The device for measuring a mixture ratio of a dielectric object to be measured according to claim 6, wherein the high frequency voltmeter is an oscilloscope. (10) The device for measuring the mixture ratio of a dielectric object to be measured according to claim 1, wherein the oscillator is, for example, an LC, RC, crystal oscillator, or an oscillator of various other oscillation methods. (11) An apparatus for measuring a mixture ratio of a dielectric object to be measured according to claim 1, wherein the oscillator has a frequency discriminator.