KR101423119B1 - Apparatus for measuring density of liquid using magnetostriction - Google Patents

Apparatus for measuring density of liquid using magnetostriction Download PDF

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Publication number
KR101423119B1
KR101423119B1 KR1020140005554A KR20140005554A KR101423119B1 KR 101423119 B1 KR101423119 B1 KR 101423119B1 KR 1020140005554 A KR1020140005554 A KR 1020140005554A KR 20140005554 A KR20140005554 A KR 20140005554A KR 101423119 B1 KR101423119 B1 KR 101423119B1
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density
liquid
plotter
measured
measuring
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KR1020140005554A
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Korean (ko)
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최인섭
서무교
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서무교
산들정보통신주식회사
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Priority to PCT/KR2015/000387 priority patent/WO2015108334A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
    • G01N9/10—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by observing bodies wholly or partially immersed in fluid materials
    • G01N9/12—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by observing bodies wholly or partially immersed in fluid materials by observing the depth of immersion of the bodies, e.g. hydrometers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/10—Devices for withdrawing samples in the liquid or fluent state
    • G01N1/18—Devices for withdrawing samples in the liquid or fluent state with provision for splitting samples into portions

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
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  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
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  • Hydrology & Water Resources (AREA)
  • Level Indicators Using A Float (AREA)

Abstract

In the present invention, when measuring an unknown liquid density using a density meter equipped with a plotter, it is possible to adjust the number of the swirling vanes according to the density interval of the liquid to be measured to maintain a constant accuracy in the entire density range of the liquid to be measured .
To this end, the present invention includes a plurality of bucket wing mounting portions and an bucket wing portion having a plurality of bucket wings mounted in a detachable manner on the bucket wing mounting portion to control a flow operation of the density plotter in a vertical direction.

Description

TECHNICAL FIELD [0001] The present invention relates to an apparatus for measuring density of a liquid using magnetostriction,

The present invention relates to a technique for measuring the density of a liquid using the principle of magnetostriction, and more particularly, to a method for measuring an unknown density by using a density meter equipped with a plotter, The present invention relates to an apparatus for measuring density of a liquid using a magnetostriction.

Generally, a liquid density measuring device for measuring the density of liquid using the principle of magnetostriction is composed of a material having a density lower than that of a liquid to be measured, floating on a liquid surface and indicating the position of the liquid surface, In the lower or upper direction.

In the state where the liquid density measuring instrument is put in the liquid to be measured, the effective settlement distance is measured according to the density of the liquid, and the measured effective settlement distance is converted into the density. The "effective settlement distance" means a distance obtained by subtracting the settlement distance of the liquid surface plotter from the settlement distance of the density plotter according to the density of the liquid to be measured, according to the density of the liquid to be measured.

The density plotter floats at a position where the weight of the density plotter equilibrates with the buoyancy which is a value obtained by multiplying the volume of the liquid to be measured by the density of the liquid and the submerged volume. The density plotter is moved downward when the density of the liquid to be measured is low, and is moved upward when it is high. The floating principle of such a density plotter can be expressed by the following equation.

[Equation 1]

Density Plotter weight = (locked volume) x (liquid density)

At this time, a portion of the upper portion of the density plotter protrudes to the surface of the liquid to be measured. The smaller the cross-sectional area of the protruding portion, the more the density plotter moves (sinks) to the same density. This is because the volume change of the locked portion of the density plotter is constant with respect to the density change of the liquid to be measured, so that the smaller the cross-sectional area of the protruded portion of the density plotter, the larger the change of the effective settlement distance becomes.

1 is a graph showing an effective settlement distance between a density plotter and a liquid level plotter according to a density change of a liquid. Here, "G1" is a settlement distance-density relationship graph of a density plotter, "G2 " is a settlement distance- density relationship graph of a level plotter, and" G3 "is a graph of an effective settlement distance. G3 = G1-G2.

 As shown in FIG. 1, the effective settlement distance corresponding to each density does not change linearly proportional to the density change of the liquid to be measured, but changes more largely as the density becomes lower, and less linearly as the density becomes higher. And it can be seen that it is an inverse relation.

In a conventional liquid density measurement technique, when an unknown liquid density is measured, an effective settlement distance, which is input into the liquid and varies according to the density of the liquid, is measured. Then, based on the measured effective settlement distance, Is obtained.

However, in the conventional liquid density measurement technique, when the density of the liquid to be measured is obtained based on the effective settlement distance between the liquid level plotter and the density plotter measured at an arbitrary point, Although the settling distance is long, the density of the measured liquid can be displayed with the required accuracy. However, the effective settlement distance between the liquid level plotter and the density plotter is short in the relatively high density section and the density of the measured liquid is indicated with the required accuracy I can not.

As described above, in the conventional liquid density measurement technique, the effective settlement distance between the liquid level plotter and the density plotter is short in the section where the density of the liquid to be measured is comparatively high, so that the resolution is degraded. As a result, There is a problem that the density can not be expressed beyond the required accuracy.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an apparatus and a method for measuring an unknown liquid density using a density meter equipped with a plotter by adjusting the number of swirling wings according to a density interval of a liquid to be measured, So that a certain precision can be maintained.

According to an aspect of the present invention, there is provided an apparatus for measuring a density of a liquid using magnetostriction, the apparatus comprising: And a first magnetic body installed to be able to generate interference with a magnetic field generated in the magnetostrictive wire; A dense floater having a second magnetic body and a weight which are installed in the lower portion of the liquid level floater so as to be able to flow in the vertical direction along the outer circumferential surface of the metal tube and interfere with the magnetic field generated in the magnetostrictive wire; An ascending blade having a plurality of swirl vanes mounted in a detachable manner on a plurality of swirl blade mounting portions and a plurality of swirl blades mounting portions for controlling a flow operation of the density plotter in a vertical direction; And obtaining an effective settlement distance, which is a difference in settlement distance between the liquid level plotter and the density plotter, based on a signal generated by magnetostriction by the first magnetic body and the second magnetic body after supplying a pulse to the magnetostrictive wire, And a density detector for obtaining the density of the liquid to be measured based on the effective settlement distance.

In the present invention, when the density of an unknown liquid is measured by using a density meter equipped with a plotter, the number of the swirling vanes can be easily adjusted according to the density interval of the liquid to be measured, It is possible to measure the sinking distance between the liquid level plotter and the density plotter which is sufficiently long in the liquid density measuring apparatus of the present invention, and thereby the density of the liquid can be measured while maintaining the required accuracy in the entire density range of the liquid to be measured.

1 is a graph showing an effective settlement distance between a density plotter and a liquid level plotter according to a density change of a liquid.
Fig. 2 is an overall configuration diagram of an apparatus for measuring liquid density using magnetostriction of the present invention. Fig.
Fig. 3 is a perspective view of the buoyant blade. Fig.
4 (a) is a waveform diagram of a pulse output from the pulse generator.
4 (b) is a waveform diagram of the effective movement distance detected by the arithmetic processing unit.
4C is a waveform diagram of a pulse string output from the oscillation section.
5 is a graph showing the relationship between the effective settlement distance and the density according to the number of buckle blades.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2, the density measuring apparatus 300 includes a density sensor unit 100 and a density detecting unit 200, as shown in FIG. 2. The density measuring apparatus 300 shown in FIG.

The density sensor unit 100 is placed in a container or a space containing a liquid to be measured for density. The shape of the density sensor unit 100 is not particularly limited.

The density sensor unit 100 includes a metal tube 111 having a predetermined diameter and a vibration wave generator 120 mounted through a plurality of first spaces 112 provided in the metal tube 111.

A liquid level plotter 101 for measuring the density of the liquid to be measured and a liquid level plotter 102 for measuring the density of the liquid to be measured, which is made of a material having a density lower than that of the liquid to be measured, A first magnetic body 101A for causing a magnetostriction phenomenon is mounted in the liquid level plotter 101 and a magnetic field is generated in the inside of the density plotter 102 to cause a magnetostriction phenomenon The second magnetic body 102A is mounted.

The density plotter 102 is equipped with a weight 102B having an appropriate weight inside the density plotter 102 so as to be locked at a position corresponding to the density of the liquid to be measured. The density plotter 102 is coupled to a fluctuating wing unit 125. Therefore, when the density of the liquid to be measured is high, the density plotter 102 floats up, and when the density is low, it sinks downward. The submerging principle of the dense floater 102 of the dense plotter 102 is similar to the principle of a submerged density meter using a conventional weight.

The vibrating wave generating part 120 is inserted into the metal pipe 111 and is installed therein. The vibrating wave generating part 120 includes a brass pipe 121, a parcel 122 installed so as to overlap the brass pipe 121, And a magnetostrictive wire 123 installed to penetrate the center of the second space 124 provided at regular intervals inside the association 122.

The density detector 200 includes a pulse generator 210, a pickup coil 220, a signal processor 230, an operation processor 240, a memory 240A, an oscillator 250, and a display 260.

3A and 3B are perspective views showing an embodiment of the downward wing portion 125. As shown in FIG.

2 and 3A and 3B, the downward wing portion 125 has a cylindrical structure, and a metal pipe insertion hole 125A for allowing the metal pipe 111 to be inserted into the central shaft is formed in a central axis, And a dense floater mounting space 125D having an annular structure centered on the metal pipe inserting hole 125A is formed in the mounting hole 125B for mounting and dismounting the rod- And the density plotter 102 is mounted. The buick wing mounting portion 125B may be implemented in various forms, and in the present embodiment, a threaded mounting portion is taken as an example.

In the present embodiment, the buick wing portion 125 has a cylindrical structure, but the present invention is not limited thereto and may be configured in various forms. In addition, although the buoy wing 125C has a bar shape, the buoy wing 125C may have various shapes.

The operation of the liquid density measuring apparatus using magnetostriction according to the present invention will now be described with reference to FIGS. 2 to 5. FIG.

The pulse generating unit 210 generates a series of square wave pulses as shown in FIG. 4 (a) to measure the density of the liquid to be measured, and outputs the pulses so that a sufficient magnetic field necessary for magnetostriction can be generated .

The square wave pulse thus multiplied passes through the pickup coil 220 and is supplied to the magnetostrictive wire 123 of the density sensor unit 100. Accordingly, a magnetic field is generated in the magnetostrictive wire 123, and the generated magnetic field moves in the longitudinal direction of the magnetostrictive wire 123 in accordance with the movement of the current pulse to be propagated.

When the magnetic field thus moved causes interference with the magnetic field generated by the first magnetic body 101A of the liquid level plotter 101 and the second magnetic body 102A of the density plotter 102, A deformed vibration wave (ultrasonic wave) due to a variation in length is generated, and propagation in both the reverse direction and the forward direction occurs based on the traveling direction of the current pulse waveform. This phenomenon is called magnetostriction phenomenon. When the vibration wave transmitted as described above is transmitted to the pickup coil 220, the vibration of the ferromagnetic material in which the magnetic dipole is arranged by the external magnetic field is disturbed to inversely change the magnetic field, An induced electromotive force is generated.

The signal detector 230 detects a voltage induced in the pickup coil 220 and generates a detection signal corresponding to the detected voltage. The signal detector 230 amplifies the detected voltage to a level suitable for processing a signal at a subsequent stage, And outputs the pulse in a stabilized form.

 The oscillation unit 250 generates and outputs a pulse train as shown in FIG. 4 (c) using a crystal oscillator.

The arithmetic processing unit 240 compares the detection signal input through the signal detection unit 230, that is, the interval between the detection signals of the liquid level plotter 101 and the density plotter 102, with the reference pulse train input from the oscillation unit 250 And the measurement result is converted into the effective settlement distance between the liquid level plotter 101 and the density plotter 102. [ At this time, the conversion result can be corrected according to the ambient temperature. The difference in settlement distance between the liquid level plotter 101 and the density plotter 102 in accordance with the density value of the liquid to be measured is hereinafter referred to as the "effective settlement distance" The sinking distance of each of the density plotters 102 is referred to as "sinking distance ".

 In other words, the detection signal of the liquid level plotter 101 and the detection signal of the density plotter 102, inputted through the above path, represent a time difference. The operation processing unit 240, based on this time difference, Calculation distance is calculated.

4 (b) shows the effective settlement distance between detected pulses by the liquid level plotter 101 and the density plotter 102, which are input to the arithmetic processing unit 240. FIG. That is, the time when the detection signal by the liquid level plotter 101 located on the surface of the liquid to be measured is inputted to the calculation processing section 240 and the density plotter which is locked to some extent from the surface of the liquid to be measured by the density of the liquid to be measured There is a difference in the time at which the detection signal by the detection unit 102 is input to the operation processing unit 240. [ The calculation processing unit 240 calculates the effective settlement distance based on the time difference.

 The calculation processing unit 240 calculates the effective settlement distance through the process described above, and then calculates the density of the liquid based on the effective settlement distance. At this time, it is also possible to calculate the density of the liquid by using the correction point reference value built in advance in the memory 240A.

To this end, the density measurement reference value for density measurement may be stored in the memory 240A by the density measuring device 300 before the density measuring device 300 is shipped or after it is shipped. In the memory 240A, settlement distances between the respective liquid level plotters 101 and the density plotters 102 with respect to the density measured by the density measuring device 300 may be stored.

On the other hand, as shown in the effective settlement distance-density graph of FIG. 1, the effective settlement distance corresponding to the density is a nonlinear state in which the effective settlement distance is changed more as the density is lower for a constant density change, Inverse relationship.

In view of this, according to the present invention, the number of the swirling vanes 125C mounted on the swirling vane portion 125 can be appropriately varied according to the density of the liquid to be measured. By doing so, the effective settlement distance between the liquid level plotter 101 and the density plotter 102 becomes as large as necessary for the high-precision density measurement regardless of the density section of the liquid to be measured (for example, gasoline: 0.7 to 0.8 g / cm 3 ) .

For this, as described above, a plurality of swirl-wing mounting parts 125B are provided on the swirl-wing part 125, and a plurality of swirl-wing mounting parts 125B are mounted on the plurality of swirl-wing mounting parts 125B according to the density of the liquid to be measured, And wings 125C.

There are various ways of forming the buick wing mounting portion 125B. For example, it is possible to form the swinging blade mounting portions 125B symmetrically with respect to the center point of the upper surface of the swinging blade portion 125. [ In this case, when the blades 125C are added to or removed from the bladed blade mounting portions 125B, they can be added to or removed from positions symmetrical to each other while maintaining the center of gravity, so that the bladed blade 125 is balanced Can help.

5 is a graph showing the relationship of effective settlement distance-density according to the number of the swing blades 125C when the number of swing blades 125C mounted on the swinging blade mounting portion 125B is varied in the swinging blade 125 . That is, when the density of the liquid to be measured belongs to the range of 0.5 to 0.6, 10 of the reed blades 125C are mounted. When the density of the liquid to be measured belongs to the range of 0.6 to 0.7, 7 of the reed blades 125C are mounted, Five wing blades 125C are mounted and four wing blades 125C are mounted when the wing blades 125C belong to the range of 0.8 to 0.9 and three wing blades 125C are mounted when the wing blades 125C belong to the range of 0.9 to 1.0 And the effective settlement distance-density relationship graphs.

As shown in FIG. 5, the effective sinking distance increases as the number of the swinging blades 125C mounted decreases.

The table below shows the number, effective sinking distance, and conditions of the swirl blades 125C mounted on the swirl blades mounting portion 125B corresponding to the density section of the liquid to be measured.

Figure 112014004608311-pat00001

As shown in the above table, as the density of the liquid to be measured is lower, the number of the swirl blades 125C mounted on the swirl-wing mounting portion 125B is appropriately increased so that the required effective settlement distance (100.17 to 105.76 mm) can be obtained. Therefore, when the density detecting unit 200 measures the density of the liquid using the density sensor unit 100, the required change in the effective settlement distance is maintained regardless of the density range of the liquid to be measured, Can be guaranteed to the required level.

In order to obtain the effective settlement distance as described above, it is preferable that the diameter of the downward blade 125C is 4 mm, the volume of the density plotter 102 is 42.3 cm 3 , the density of the liquid plotter 101, (Effective settlement distance) of 60 mm is assumed as an example. The diameter and size of the buoy wing 125C can be variously implemented. The above conditions are not fixed, but can be appropriately changed as needed.

The mounting number of the swirling vane 125C suitable for the density section of the liquid to be measured as shown in the above table can be displayed on the display section 260 under the control of the calculation processing section 240. [ As another embodiment, it can be shown in the product manual when selling the density meter.

Although the preferred embodiments of the present invention have been described in detail above, it should be understood that the scope of the present invention is not limited thereto. These embodiments are also within the scope of the present invention.

100: density sensor part 101: liquid surface plotter
101A: first magnetic substance 102: density plotter
102A: second magnetic body 111: metal tube
112: first space 120: vibration wave generating part
121: brass tube 122: temple connection
123: magnetostrictive wire 124: second space
125: a wing blade part 125A: a metal pipe insertion hole
125B: Lower wing mounting portion 125C: Lower wing
125D: density plotter mounting space part 200: density detector
210: Pulse generator 220: Pickup coil
230: Signal detection unit 240:
240A: memory 250:
260: display unit 300: density measuring instrument

Claims (11)

There is provided a liquid level plotter comprising a first magnetic body provided so as to be movable in the up and down direction along the outer circumferential surface of a metal tube incorporating the magnetostrictive wire and causing a magnetic field generated in the magnetostrictive wire to interfere with the first magnetic body, ;
A dense floater having a second magnetic body and a weight which are installed in the lower portion of the liquid level floater so as to be able to flow in the vertical direction along the outer circumferential surface of the metal tube and interfere with the magnetic field generated in the magnetostrictive wire;
A plurality of bladed blade attaching portions and a plurality of bladed blade attaching / detaching means for attaching / detaching the bladed blade attaching portions to / from each of the plurality of bladed blade attaching portions to control a flow operation of the density plotter in a vertical direction; And
And an effective settlement distance, which is a difference in settlement distance between the liquid level plotter and the density plotter, is obtained based on a signal generated by magnetostriction by the first magnetic body and the second magnetic body after the pulse is supplied to the magnetostrictive wire, And a density detector for obtaining a density of the liquid to be measured based on the settlement distance.
[3] The apparatus according to claim 1, wherein, when the density detector measures the density of the liquid by using the density sensor unit, the downsizing blade unit adjusts the density of the liquid to be measured to maintain the change in the effective settlement distance, And a detachable structure so that a buoyant blade can be added or removed.
[3] The apparatus as set forth in claim 1, wherein the downward blade has a symmetrically shaped swivel blade mounting portion so as to be added to or removed from a position symmetrical to each other while maintaining a center of gravity when the swirl vane is added or removed. A device for measuring the density of a liquid using a liquid.
The apparatus for measuring density of liquid according to claim 1, wherein the swirl blade section has a cylindrical structure.
[2] The apparatus of claim 1, wherein the buckwheel has a metal pipe insertion hole for allowing the metal pipe to be inserted into the center shaft in a flowable manner.
The apparatus for measuring density of liquid according to claim 3, wherein the buick wing portion includes a density plotter mounting space for mounting the density plotter.
The apparatus for measuring density of liquid according to claim 1, wherein the plurality of buick wing mounting portions are provided on an upper surface of the buoy wing portion.
8. The apparatus for measuring density of liquid according to claim 7, wherein the buick wing mounting portion has a threaded structure.
The apparatus for measuring density of liquid according to claim 1, wherein the swirl blade is formed in a rod shape.
The apparatus for measuring density of liquid according to claim 1, wherein the plurality of buoy wings include buoy wings of different sizes.
The apparatus for measuring density of liquid according to claim 1, wherein the density detecting section includes a display section for displaying the number of mounting of the blades corresponding to the density section of the liquid to be measured.
KR1020140005554A 2014-01-16 2014-01-16 Apparatus for measuring density of liquid using magnetostriction KR101423119B1 (en)

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PCT/KR2015/000387 WO2015108334A1 (en) 2014-01-16 2015-01-14 Device for measuring density of liquid using magnetostriction

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220101414A (en) * 2021-01-11 2022-07-19 충남대학교산학협력단 Ultrasonic position sensing apparatus of using magnetostrictive principle and sensing method thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006084311A (en) 2004-09-15 2006-03-30 National Institute Of Advanced Industrial & Technology Magnetic levitation density meter
KR100704490B1 (en) 2005-07-20 2007-04-10 한국표준과학연구원 Construction of hydrostatic weighing apparatus for density measurement
KR20100086523A (en) * 2009-01-23 2010-08-02 한국과학기술원 Density measurement device with shock absorbing device
KR101258482B1 (en) 2006-01-30 2013-04-26 프랭클린 퓨얼링 시스템즈, 인코포레이티드 Liquid level and density measurement device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006084311A (en) 2004-09-15 2006-03-30 National Institute Of Advanced Industrial & Technology Magnetic levitation density meter
KR100704490B1 (en) 2005-07-20 2007-04-10 한국표준과학연구원 Construction of hydrostatic weighing apparatus for density measurement
KR101258482B1 (en) 2006-01-30 2013-04-26 프랭클린 퓨얼링 시스템즈, 인코포레이티드 Liquid level and density measurement device
KR20100086523A (en) * 2009-01-23 2010-08-02 한국과학기술원 Density measurement device with shock absorbing device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220101414A (en) * 2021-01-11 2022-07-19 충남대학교산학협력단 Ultrasonic position sensing apparatus of using magnetostrictive principle and sensing method thereof
KR102531031B1 (en) 2021-01-11 2023-05-10 충남대학교 산학협력단 Ultrasonic position sensing apparatus of using magnetostrictive principle and sensing method thereof

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