KR101664798B1 - Microbalance System - Google Patents

Microbalance System Download PDF

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Publication number
KR101664798B1
KR101664798B1 KR1020150049116A KR20150049116A KR101664798B1 KR 101664798 B1 KR101664798 B1 KR 101664798B1 KR 1020150049116 A KR1020150049116 A KR 1020150049116A KR 20150049116 A KR20150049116 A KR 20150049116A KR 101664798 B1 KR101664798 B1 KR 101664798B1
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South Korea
Prior art keywords
pipe
filter
vibration
arrangement
magnetic
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KR1020150049116A
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Korean (ko)
Inventor
안강호
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한양대학교 에리카산학협력단
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Priority to KR1020150049116A priority Critical patent/KR101664798B1/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
    • G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
    • G01G3/16—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing measuring variations of frequency of oscillations of the body
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
    • G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
    • G01G3/16—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing measuring variations of frequency of oscillations of the body
    • G01G3/165—Constructional details
    • 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
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
    • G01N1/2205—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling with filters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Biochemistry (AREA)
  • Analytical Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Molecular Biology (AREA)
  • Cleaning In General (AREA)

Abstract

The present invention relates to a microbalance system. According to the present invention, the microbalance system comprises: an arrangement part (100) which has magnetism on which an object (110) is arranged; a vibrating unit (200) which vibrates the arrangement part (100); and a vibration detecting unit (300) which generates induced currents in accordance with a magnetic flux changed by the vibration of the arrangement part (100) having magnetism. A change in vibration frequency of the arrangement part (100) is calculated using the induced currents generated in the vibration detecting unit (300), and a mass of the object (110) is calculated using the calculated change in the vibration frequency of the arrangement part (100).

Description

[0001] Microbalance System [0002]

The present invention relates to a fine mass measurement system.

Fine dust in the atmosphere has been designated by the World Health Organization (WTO) as a carcinogen in 2013, and the interest in fine dust concentration is increasing as the life of the people becomes uncomfortable due to fine dust coming from China. At present, the concentration standard of fine dust is indicated by mass of dust per 1 m 3 [kg / m 3 ], and it is very difficult to measure because it is a minute mass. As described above, the equipment for measuring the minute mass is almost the only state of the micro mass measuring instrument disclosed in the patent documents of the prior art documents. 1 is a cross-sectional view of a conventional micro mass meter. As shown in FIG. 1, a conventional micro mass-measuring device has particles 32 disposed on a substrate 30, vibrating the vibrating portion 8 to detect a change in the natural frequency by an optical method, The change in the frequency is calculated by changing the mass. As shown in the following equation, the mass change can be expressed as a function of the frequency. Therefore, by measuring the initial frequency f f and the frequency f i after the particle 32 is disposed, the mass δm of the particle 32 can be measured.

? m = K 0 [(1 / f f 2 -1 / f i 2 )]

As described above, in the conventional micro mass-measuring device, vibration is applied in order to measure the mass, and the frequency of the vibration is detected by an optical method. Thus, an electrooptical transducer (48) is used to detect the frequency of the light by an optical method. The electro-optical converter 48 uses optical components such as an LED / optical fiber for emitting light and a photodiode / optical fiber for receiving light. However, optical components are very difficult to manufacture and maintain. Particularly, alignment of the optical system is very important in manufacturing the optical components. For this purpose, there is a problem that the alignment of the optical system to all products must be performed by hand. In addition, if severe vibration occurs during use, there arises a problem that alignment of the optical system is problematic and accurate measurement is difficult. In addition, when measuring the mass of dust or the like, there is a problem in that accurate measurement is difficult due to the alignment of the optical system being distorted or contaminated due to exposure to dust.

US 3926271 A

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a fine mass measurement system for measuring a mass of a measurement object by calculating a change in frequency using an induced current, .

The fine mass measurement system according to the embodiment of the present invention generates an induced current according to a magnetic flux which is changed by the vibration of the arrangement portion having magnetism and the arrangement portion having magnetism, And the mass of the object to be measured is calculated by using the calculated change in the frequency of the arrangement part.

In the fine mass measurement system according to the embodiment of the present invention, the object to be measured is dust, and the arrangement part includes a filter for collecting the dust, a filter holder for supporting the filter, And a pipe communicating with the holder and transferring the gas in a direction away from the filter.

In the fine mass measurement system according to the embodiment of the present invention, the pipe has magnetism.

In the fine mass measurement system according to the embodiment of the present invention, the pipe is a non-magnetic body, and the pipe is coated with paint having magnetism.

In the fine mass measurement system according to the embodiment of the present invention, the pipe is a non-magnetic body, and the pipe or the filter holder is provided with a magnetic body.

In the fine mass measurement system according to the embodiment of the present invention, the vibration detecting means includes a permanent magnet and a coil wound around the permanent magnet.

In the fine mass measurement system according to the embodiment of the present invention, the vibration generating means causes the arrangement portion to vibrate using the magnetic force of the electromagnet.

In the fine mass measurement system according to the embodiment of the present invention, the vibration generating means vibrates to vibrate the arrangement portion.

In the fine mass measurement system according to the embodiment of the present invention, the arrangement part is further provided with a chamber accommodated therein and having an opening through which the dust is sucked.

In the fine mass measurement system according to the embodiment of the present invention, when the differential pressure between the inside of the chamber and the inside of the pipe is equal to or greater than a predetermined amount, the gas is transported through the pipe in the filter direction.

In the fine mass measurement system according to an embodiment of the present invention, the particle separator is provided in the opening and filters the particles larger than a predetermined size.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

Prior to that, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor may properly define the concept of the term in order to best explain its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

According to the present invention, the change in frequency is calculated using the induced current, and the mass of the object to be measured is measured using the calculated change in frequency, so that the configuration is simple and unaffected by dust pollution In addition, there is an advantage in that problems such as misalignment do not occur due to alignment problem of optical system due to vibration.

1 is a cross-sectional view of a conventional micro mass meter,
FIGS. 2 to 6 are conceptual diagrams of a fine mass measurement system according to an embodiment of the present invention, and FIGS.
FIGS. 7 to 9 are conceptual diagrams showing the operation of the fine mass measurement system according to the embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The objectives, specific advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. It should be noted that, in the present specification, the reference numerals are added to the constituent elements of the drawings, and the same constituent elements have the same numerical numbers as much as possible even if they are displayed on different drawings. Also, the terms "first "," second ", and the like are used to distinguish one element from another element, and the element is not limited thereto. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, detailed description of related arts which may unnecessarily obscure the gist of the present invention will be omitted.

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

2 to 6 are conceptual diagrams of a fine mass measurement system according to an embodiment of the present invention.

As shown in FIGS. 2 to 6, the micro mass measuring system according to the present embodiment includes a placement unit 100 having a magnetic field on which a measurement object 110 is disposed, vibration generating means (not shown) for vibrating the placement unit 100 200), and a vibration detecting means (300) for generating an induced current in accordance with a magnetic flux which changes in accordance with the vibration of the arrangement portion (100) having magnetism. The induction current generated in the vibration detecting means (300) And the mass of the measurement object 110 is calculated using the change in the frequency of the arrangement unit 100 calculated.

The arrangement unit 100 is disposed inside the chamber 500 with the measurement object 110 disposed thereon. Here, the measurement target 110 disposed in the arrangement unit 100 may be, for example, dust, and the arrangement unit 100 includes a filter 120 for collecting dust, a filter holder 130 for supporting the filter 120 And a pipe 140 for supporting the filter holder 130. At this time, the pipe 140 communicates with the filter holder 130, and the pump 141 is connected to transfer the gas in a direction away from the filter 120, and the flow meter 143 is provided to grasp the amount of the gas . When the gas is fed from the pipe 140 in the direction away from the filter 120 using the pump 141, the filter 120 collects the dust while sucking the gas. At this time, the dust can be introduced through the opening 510 of the chamber 500 formed to face the filter 120 (A). On the other hand, the arrangement unit 100 has magnetism and is vibrated by the vibration generating means 200, so that the vibration detecting means 300 generates an induced current to measure the mass of the measurement subject 110. At this time, the configuration in which the arrangement section 100 has magnetism is not particularly limited, but for example, the pipe 140 may be made of iron, magnetic material, or the like to have magnetism (refer to FIG. However, when the pipe 140 is a non-magnetic material such as plastic, glass, or stainless steel, the pipe 140 may be coated with a magnetic paint 145 (see FIG. 3). In addition, when the pipe 140 is a non-magnetic body, the pipe 140 may be provided with a separate magnetic body 147 (see FIG. 4), or the filter holder 130 may be provided with a separate magnetic body 147 (See FIG. 5).

The vibration generating means 200 serves to vibrate the arrangement unit 100. In this way, when the vibration generating means 200 vibrates the placing portion 100 and the measuring object 110 is placed on the placing portion 100, the frequency of the placing portion 100 is changed, And the mass of the measurement target 110 can be finally measured by the detection means 300. Here, as long as the vibration generating means 200 can vibrate the placing portion 100, the placing portion 100 can be vibrated using, for example, an electromagnet method or a direct blowing method, though it is not particularly limited. Specifically, the vibration generating means 200 can vibrate the arrangement portion 100 using the magnetic force of the electromagnet. As described above, since the arrangement section 100 is magnetized, when the electromagnets of the vibration generating means 200 are arranged so as to face a specific portion of the arrangement section 100 having magnetism and then an electric current is applied, The arrangement section 100 can be vibrated. Alternatively, the vibration generating means 200 may cause the placement portion 100 to vibrate by applying a physical blow to the placement portion 100.

The vibration detecting means 300 serves to detect the frequency of the arrangement unit 100. The vibration detecting means 300 generates the induced current according to the magnetic flux which is changed by the vibration of the arrangement portion 100 having magnetism when the arrangement portion 100 vibrates by the vibration generating means 200, The frequency of the arrangement unit 100 can be detected. Specifically, the vibration detecting means 300 may include a permanent magnet 310 and a coil 320 wound around the permanent magnet 310. Therefore, when the distance between the arrangement portion 100 and the vibration detection means 300 decreases or increases while the arrangement portion 100 having magnetism vibrates, the change in magnetic flux in the coil 320 of the vibration detection means 300 An induced current is generated in a direction that interferes with the current. Since the variation of the induction current coincides with the frequency of the arrangement unit 100, the frequency of the arrangement unit 100 can be confirmed by measuring the frequency of the induction current. As a result, the frequency of the arrangement unit 100 before the measurement object 110 is placed and the frequency of the arrangement unit 100 after the measurement object 110 are disposed are calculated using the induced current generated in the vibration detection means 300 The change in the frequency of the arrangement part 100 can be calculated on the basis of the change in the frequency of the arrangement part 100 and the mass of the measurement object 110 can be measured using the calculated change in the frequency of the arrangement part 100. [ Specifically, the induced current generated in the vibration detecting means 300 can be amplified through the amplifier 410 and transmitted to the data processing unit 400. At this time, the data processing unit 400 calculates the change in the frequency of the placement unit 100 based on the delivered induced current, and calculates the mass of the measurement target 110 using the calculated change in the frequency of the placement unit 100 can do. On the other hand, the vibration detecting means 300 may be disposed so as to face a specific region having magnetism in the arrangement portion 100. For example, when the pipe 140 of the placement unit 100 itself has magnetic properties (see FIG. 2) or the pipe 140 of the placement unit 100 is coated with a paint 145 3), the vibration detecting means 300 may be arranged to face the pipe 140. [ Alternatively, when a separate magnetic body 147 is provided on the pipe 140 of the arrangement unit 100 (see FIG. 4) or a separate magnetic body 147 is provided on the filter holder 130 of the arrangement unit 100 (Refer to FIG. 5), the vibration detecting means 300 may be arranged to face the magnetic body 147. FIG. Particularly, when the magnetic substance 147 is provided in the filter holder 130 (see FIG. 5), the vibration width of the filter holder 130 is larger than that of the pipe 140, It is possible to easily calculate the change in the frequency of the arrangement unit 100. [

In addition, a differential pressure gauge 600 connected to the inside of the chamber 500 and the pipe 140 may be provided, and the differential pressure between the inside of the chamber 500 and the inside of the pipe 140 can be measured through the differential pressure meter 600 have. At this time, if the differential pressure measured through the differential pressure meter 600 is equal to or greater than a predetermined amount, too much dust is collected in the filter 120 to reduce the collection efficiency, or the differential pressure applied to the filter 120 becomes large and the filter 120 is broken . Therefore, if the differential pressure is equal to or greater than a predetermined amount, the gas is transferred (B, Back Flush) to the filter 120 through the pipe 140 using compressed air, and the purge valve 520 (C) by discharging the gas to the outside of the chamber 500 through the purge valve. As a result, breakage of the filter 120 can be prevented as much as possible, and the operation of the fine mass measuring system can be continuously performed for a long period of time by reusing the filter 120.

6, the particle separator 700 may be provided in the opening 510 of the chamber 500 where the dust is sucked. The particle separator 700 filters out particles having a predetermined size or more and measures the mass of only fine dust (PM10: fine dust having a particle diameter of 10 μm or less) or ultrafine dust (PM 2.5: fine dust having a particle diameter of 2.5 μm or less) . The kind of the particle separator 700 may be an impactor, a virtual impactor, a cyclone, or the like, although not particularly limited thereto.

FIGS. 7 to 9 are conceptual diagrams showing the operation of the fine mass measurement system according to the embodiment of the present invention.

First, as shown in Fig. 7, the arrangement unit 100 is vibrated using the vibration generating means 200 in a state in which the measurement target 110 such as dust is not disposed in the arrangement unit 100. [ At this time, the vibration detecting means 300 generates an induced current in accordance with the magnetic flux which is changed by the vibration of the arrangement portion 100 having magnetism. At the same time, the data processing unit 400 calculates the frequency of the placement unit 100 before the measurement object 110 (dust) is placed using the induced current generated in the vibration detection means 300.

Next, as shown in FIG. 8, while the vibration generating means 200 is used to continuously vibrate the arrangement portion 100, the gas is discharged from the pipe 140 in the direction away from the filter 120 So that dust is sucked into the filter 120. At this time, the vibration detecting means 300 generates an induced current in accordance with the magnetic flux which is changed by the vibration of the arrangement portion 100 having magnetism. At the same time, the data processing unit 400 uses the induced current generated in the vibration detecting means 300 to calculate the frequency of the arrangement portion 100 after the measurement object 110 (dust) is disposed. As a result, it is possible to calculate the frequency of the placement unit 100 before the measurement object 110 is placed and the frequency of the placement unit 100 after the object 110 is placed, Thus, the data processing unit 400 can calculate the mass of the measurement object 110 in real time.

9, while the differential pressure between the inside of the chamber 500 and the inside of the pipe 140 is measured by the differential pressure meter 600, if the differential pressure is equal to or greater than a predetermined amount, And the gas is discharged to the outside of the chamber 500 through a purge valve 520 provided at one side of the chamber 500 C). Through this process, it is possible to prevent the filter 120 from being damaged as much as possible by blowing off the particles collected in the filter 120, and the operation of the fine mass measuring system can be continuously performed for a long time by reusing the filter 120 .

As described above, the fine mass measurement system according to the present embodiment calculates the change in frequency using the induced current and measures the mass of the measurement target 110 using the calculated change in the frequency, The other configuration is simple, and it is not affected by dust contamination at all, and there is an advantage that problems such as misalignment do not occur due to the alignment problem of optical system due to vibration.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the present invention. It is obvious that the modification or improvement is possible.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100: arrangement part 110: measurement object
120: filter 130: filter holder
140: Pipe 141: Pump
143: Flow meter 145: Paint
147: magnetic body 200: vibration generating means
300: Vibration detection means 310: permanent magnet
320: coil 400: data processing unit
410: amplifier 500: chamber
510: opening 520: purge valve
600: differential pressure meter 700: particle separator

Claims (11)

A placement unit in which a measurement object is disposed and has a magnetic property;
A vibration generating means for vibrating the arrangement portion; And
Vibration detecting means for generating an induced current in accordance with a magnetic flux changed by the vibration of the arrangement portion having magnetic properties;
/ RTI >
Calculating a change in the frequency of the placement unit using the induced current generated by the vibration detection unit, calculating a mass of the measurement target using the calculated change in frequency of the placement unit,
Wherein the object to be measured is dust,
The arrangement unit
A filter for collecting the dust;
A filter holder for supporting the filter; And
A pipe for supporting the filter holder and communicating with the filter holder and transferring the gas in a direction away from the filter;
Lt; / RTI >
A chamber in which the arrangement part is accommodated and in which an opening through which the dust is sucked is formed;
Further comprising:
Wherein the gas is transferred through the pipe in the direction of the filter when the differential pressure between the inside of the chamber and the inside of the pipe is equal to or greater than a predetermined amount.
delete The method according to claim 1,
Wherein the pipe has magnetism.
The method according to claim 1,
The pipe is a non-magnetic body,
Wherein the pipe is coated with a magnetic paint.
The method according to claim 1,
The pipe is a non-magnetic body,
Wherein the pipe or the filter holder is provided with a magnetic substance.
The method according to claim 1,
Wherein the vibration detecting means comprises:
Permanent magnets; And
A coil wound on the permanent magnet;
Wherein the micro mass measuring system comprises:
The method according to claim 1,
Wherein the vibration generating means vibrates the arrangement portion using the magnetic force of the electromagnet.
The method according to claim 1,
Wherein said vibration generating means vibrates and vibrates said arrangement.
delete delete The method according to claim 1,
A particle separator provided in the opening to filter particles larger than a predetermined size;
Further comprising a micro mass measuring system.
KR1020150049116A 2015-04-07 2015-04-07 Microbalance System KR101664798B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108844869A (en) * 2018-06-06 2018-11-20 山西省环境科学研究院 A kind of flue dust on-line sampling and weighing device and method
KR20200078219A (en) * 2018-12-21 2020-07-01 경북대학교 산학협력단 Detection device for foodborne pathogen and its method for foodborne pathogen detection

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3926271A (en) 1975-02-03 1975-12-16 Rupprecht Georg Microbalance
JP2001318044A (en) * 2000-05-01 2001-11-16 Ohm Denki Kk Classified particle measuring device, classified particle measuring method, micro mass measuring device and micro mass measuring method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3926271A (en) 1975-02-03 1975-12-16 Rupprecht Georg Microbalance
JP2001318044A (en) * 2000-05-01 2001-11-16 Ohm Denki Kk Classified particle measuring device, classified particle measuring method, micro mass measuring device and micro mass measuring method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108844869A (en) * 2018-06-06 2018-11-20 山西省环境科学研究院 A kind of flue dust on-line sampling and weighing device and method
CN108844869B (en) * 2018-06-06 2024-04-12 山西省生态环境监测和应急保障中心(山西省生态环境科学研究院) Online smoke dust sampling and weighing device and method
KR20200078219A (en) * 2018-12-21 2020-07-01 경북대학교 산학협력단 Detection device for foodborne pathogen and its method for foodborne pathogen detection
KR102157106B1 (en) 2018-12-21 2020-09-17 경북대학교 산학협력단 Detection device for foodborne pathogen and its method for foodborne pathogen detection

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