WO2020091273A1 - Dispositif photo-acoustique pour analyser un gaz dissous dans de l'huile - Google Patents

Dispositif photo-acoustique pour analyser un gaz dissous dans de l'huile Download PDF

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Publication number
WO2020091273A1
WO2020091273A1 PCT/KR2019/013632 KR2019013632W WO2020091273A1 WO 2020091273 A1 WO2020091273 A1 WO 2020091273A1 KR 2019013632 W KR2019013632 W KR 2019013632W WO 2020091273 A1 WO2020091273 A1 WO 2020091273A1
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WO
WIPO (PCT)
Prior art keywords
cell
photoacoustic
infrared
gas
measurement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2019/013632
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English (en)
Korean (ko)
Inventor
박진엽
변상윤
박성민
박종민
정재기
최윤종
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Korea Hydro and Nuclear Power Co Ltd
Original Assignee
Korea Hydro and Nuclear Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Korea Hydro and Nuclear Power Co Ltd filed Critical Korea Hydro and Nuclear Power Co Ltd
Publication of WO2020091273A1 publication Critical patent/WO2020091273A1/fr
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/02—Analysing fluids
    • G01N29/036—Analysing fluids by measuring frequency or resonance of acoustic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/021—Gases

Definitions

  • the present invention relates to an optoacoustic device for analyzing gaseous gas in oil that can be easily analyzed.
  • PAS photoacoustic spectroscopy
  • the photoacoustic spectroscopy apparatus is equipped with an optical filter that can pass only the natural frequency band of a specific gas when it receives infrared rays.
  • an optical filter that can pass only the natural frequency band of a specific gas when it receives infrared rays.
  • the optical filter receives infrared rays and passes only a specific band frequency, and by analyzing the reaction (photoacoustic) between the infrared rays of the specific frequency and the measurement gas passed through, it is possible to confirm the type and concentration of the specific gas in the mixed gas.
  • a plurality of such optical filters is provided, and is rotated by the rotational driving force of the belt, so it can be selected as a type corresponding to the measurement gas.
  • the infrared light is irradiated to the mixed gas to be measured, the light reflectance is not high and absorption of infrared rays is not performed at the location of the infrared light source or the incident hole irradiated to the mixed gas. There is a problem that does not.
  • One embodiment of the present invention is to provide a photo-acoustic device for analyzing the gas in oil in order to stably irradiate the measurement gas without causing interference and diffuse reflection during the normal alignment of the optical filter and the infrared reflection process.
  • a photoacoustic cell in which a measurement gas is injected into the interior and an infrared inlet through which infrared light irradiated to the measurement gas passes is connected to generate a photoacoustic cell by generating a photoacoustic reaction by a reaction between the measurement gas and infrared, and a photoacoustic cell It is rotatably installed on the upper side and includes an optical filter unit through which an infrared light source passes, a driving unit providing rotational driving force to the optical filter unit, and a microphone converting the photoacoustic sound generated in the photoacoustic cell into an electrical signal.
  • the infrared inlet may include a tapered infrared incident hole.
  • the photoacoustic cell may include a cell body in which an installation space is formed inside, and a measurement cell installed on the inner side spaced apart from the inner wall surface of the cell body, and connected to a gas injection part and an infrared inlet part, respectively, into which a measurement gas is injected. have.
  • the infrared inlet is connected to the measurement cell in a protruding state, and an incidence body in which an inlet hole through which infrared rays are incident is formed, and a guide hole connected to the incidence body and guiding infrared rays incident through the inlet hole into the inside of the measurement cell are formed. It may include a tapered body.
  • the guide hole is formed through the incidence body and may be formed in an inverted trapezoidal cross section in the inner direction of the measurement cell.
  • a reflective coating may be attached to the inner wall surface of the guide hole and the inner wall surface of the inflow hole.
  • the optical filter unit includes a filter body in which a connection unit for connecting a driving unit is formed at a rotational center position, and a filter body radially formed with a plurality of filter holes around the connection unit, and a filter member installed in the filter hole to pass a predetermined frequency band of infrared rays. can do.
  • the driving unit may be a step motor having a rotating shaft connected to the connecting unit to transmit rotation driving force.
  • the photoacoustic sound in a state in which no diffuse reflection or interference is generated in the process of irradiating infrared light to the measurement gas, the photoacoustic sound can be stably generated by stably irradiating infrared light to the measurement gas.
  • the optical filter it is possible to align the optical filter in a state accurately positioned on the upper side of the infrared inlet by driving the step motor, and it is possible for the infrared ray to pass through the optical filter and stably irradiate to the measurement gas.
  • FIG. 1 is an exploded perspective view schematically showing an oil-based gas analysis photoacoustic device according to an embodiment of the present invention.
  • Figure 2 is a perspective view of a main portion schematically showing the infrared inlet installed in the photoacoustic cell according to an embodiment of the present invention.
  • FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2.
  • FIG. 4 is a perspective view schematically showing an optical filter unit according to an embodiment of the present invention.
  • FIG. 1 is an exploded perspective view schematically showing an oil-based gas analysis photoacoustic device according to an embodiment of the present invention.
  • the oil-in-gas analysis photoacoustic device 100 includes an infrared inlet unit through which a measurement gas is injected and an infrared 36 irradiated to the measurement gas passes therethrough ( 30) is connected to the photoacoustic cell 10 to generate photoacoustic by the reaction of the measurement gas and infrared light, and is rotatably installed on the upper side of the photoacoustic cell 10, an optical filter through which an infrared light source 32 passes It includes a unit 40, a driving unit 60 for providing rotational driving force to the optical filter unit 40, and a microphone 70 for converting the photoacoustic sound generated in the photoacoustic cell 10 into an electrical signal.
  • the photoacoustic cell 10 may be installed to check the type and concentration of the measurement gas by introducing a measurement gas to be measured therein and reacting with the infrared light irradiated to the measurement gas.
  • the photoacoustic cell 10 is connected to an infrared inlet portion 30 through which a measurement gas is injected, and an infrared ray irradiated to the measurement gas passes through the photoacoustic sound generated by the reaction of the measurement gas and infrared rays. Analysis of the concentration or type of measurement gas can be performed.
  • the photoacoustic cell 10 is installed inside the cell body 11 in which the installation space 12 is formed inside, and spaced apart from the inner wall surface of the cell body 11, and the measurement gas and infrared rays are provided. It may include a measurement cell 13 through which photoacoustics are introduced.
  • the cell body 11 may have an installation space 12 maintained at a constant pressure therein.
  • the measurement cell 13 may be installed in the installation space 12 of the cell body 11.
  • the measuring cell 13 may be installed in a state spaced apart from the inner wall surface of the installation space 12 by a certain distance from the inside of the cell body 11.
  • the upper portion of the measurement cell 13 may be installed inside the installation space 12 in a state located at an upper position of the cell body 11.
  • the measurement cell 13 is installed in a state in which the bottom surface is spaced from the bottom surface of the cell body 11 and can be stably installed in an atmosphere maintained at a constant pressure in the installation space 12.
  • the measurement cell 13 is exemplarily described as being formed in a hexahedral shape inside the cell body 11, but is not necessarily limited thereto, and a part or the entirety of the outer surface may be appropriately changed to a round shape. Do.
  • the measurement cell 13 may be connected to a gas injection unit 20 for injecting a measurement gas, an infrared inlet 30 to allow infrared rays to be introduced into the injected measurement gas, and a microphone 70, respectively.
  • the gas injection unit 20 is connected to one side of the measurement cell 13, and thus a set amount of measurement gas may be connected to be injected into the measurement cell 13.
  • the measurement gas is an oil-in-gas used in a transformer in this embodiment.
  • the measurement gas is not necessarily limited to the gas in the transformer, and may be appropriately changed and applied to a predetermined gas for component and type analysis.
  • the measurement cell 13 may be provided with a gas discharge unit 21 for discharging the measurement gas injected therein.
  • An infrared inlet 30 may be installed on the measurement cell 13.
  • the infrared inlet 30 is installed on the upper portion of the measurement cell 13, and may be installed so that the infrared light irradiated by the predetermined infrared light source 32 is introduced into the measurement cell 13.
  • infrared rays may be irradiated from the infrared light source 32 and reflected by the concave reflector 34 to be irradiated inside the measurement cell 13 through the infrared inlet 30.
  • the infrared light is reflected by the concave reflection part 34 and is not necessarily limited to being irradiated to the infrared inflow part 30, and it is also possible to apply a change to be irradiated directly from the infrared light source 32.
  • FIG. 2 is a perspective view of a main part schematically showing an infrared inlet installed in an optoacoustic cell according to an embodiment of the present invention
  • FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2.
  • the infrared inlet 30 is connected to the measurement cell 13 in a protruding state, and the incident body 31 through which infrared rays are incident, and is connected to the incident body 31 It may include a tapered body 33 that guides the infrared rays to enter the interior of the measurement cell (13).
  • the incident body 31 may be formed with an inlet hole 31a through which infrared light emitted from the infrared light source 32 flows.
  • the inflow hole 31a is formed to penetrate the incidence body 31 in the vertical direction, and it is exemplarily described that it is formed in the incidence body 31 to have a long cylindrical shape.
  • the inlet hole 31a is not necessarily limited to being formed as a single cylinder on the incidence body 31, and may be appropriately changed to a plurality of polygons.
  • the inflow hole 31a may be formed in a tapered shape inclined in the downward direction of the incidence body 31, or may be opened in a cylindrical shape to increase the amount of infrared radiation.
  • Infrared light passing through the inlet hole 31a of the incident body 31 may pass through the tapered body 33 and be irradiated into the measurement cell 13.
  • the tapered body 33 may be formed with a guide hole 33a connected to the incident body 31 and guiding infrared rays incident through the inlet hole 31a into the inside of the measurement cell 13.
  • the guide hole 33a is formed to penetrate the incidence body 31 up and down, and may be formed to stably enter infrared rays introduced through the incidence body 31 into the interior of the measurement cell 13.
  • the guide hole 33a may be formed in an inverted trapezoidal shape in which the size opened in the inner direction of the measurement cell 13 in this embodiment is reduced.
  • the infrared rays stably enter the inside of the measurement cell 13 through the guide action of the inverted trapezoidal shape of the guide hole 33a in the unscattered state while passing through the guide hole 33a.
  • infrared rays can effectively contact and react with the measurement gas inside the measurement cell 13 without being scattered, a photoacoustic signal according to contact between the measurement gas and infrared rays can be stably generated.
  • an optical filter unit 40 through which infrared rays generated from an infrared light source is transmitted may be installed above the photoacoustic cell 10.
  • the optical filter unit 40 is installed on the upper side of the photoacoustic cell 10, and a plurality of filter members 43 corresponding to the type of measurement gas is installed, so that infrared light having a specific band frequency corresponding to the measurement gas is provided. It can be selectively transmitted.
  • FIG. 4 is a perspective view schematically showing an optical filter unit according to an embodiment of the present invention.
  • the optical filter unit 40, the filter body formed with a filter hole (41a) formed on the side of the connecting portion 42 and the connecting portion 42 is connected to the driving unit 60 in the rotational center position 41 and a filter member 43 provided in the filter hole 41a.
  • the connection part 42 refers to a portion where the rotation shaft 61 of the driving part is inserted and fixed.
  • the filter body 41 may be rotatably installed in one direction or in the reverse direction by receiving rotational driving force from the driving unit 60.
  • the filter body 41 is exemplarily described as being stably rotated by transmission of the rotational driving force of the driving unit 60 and formed in a plate shape of engineering plastic material having appropriate durability.
  • the filter body 41 may be formed in a plate shape having a rounded edge for stable installation of the plurality of filter members 43 while preventing interference with adjacent facilities during a rotational operation process.
  • the filter body 41 is not necessarily limited to a round shape, and it is also possible to apply a change to an appropriate shape in response to the shape change of the filter member 43.
  • the filter member 43 is installed in each of the plurality of filter holes 41a formed in the filter body 41, and the filter holes 41a may be respectively installed in different types.
  • the filter member 43 may be installed in the filter hole 41a by changing the type corresponding to the type of measurement gas injected into the measurement cell 13.
  • the filter member 43 may be installed on the filter body 41 to selectively transmit a specific frequency band of infrared rays corresponding to the type of the measurement gas.
  • the infrared rays react with the measurement gas injected into the measurement cell 13 to generate photoacoustics, it is possible to easily check the type and concentration of the measurement gas. Analysis of the optical sound may be performed by the microphone 70 to be described later.
  • a chopper 50 having a transmission hole 51 through which infrared rays are transmitted in the direction of the filter member 43 is installed on the upper side of the optical filter unit 40.
  • the optical filter unit 40 may be appropriately rotated in one direction or in the reverse direction by a rotational driving force according to the driving of the driving unit 60.
  • the driving unit 60 may be applied as a step motor providing rotational driving force to the filter body 41 constituting the optical filter unit 40.
  • the same reference numerals are used for the driving unit and the step motor.
  • the rotating shaft is connected to the connection portion of the filter body 41, and thus it is possible to provide the rotational driving force to the optical filter portion step by step.
  • the optical filter unit 40 can be rotated step by step at a rotation angle set by the driving force of the step motor 60, so that the vertical alignment of the filter member 43 and the infrared inlet unit 30 is stable. It can be done.
  • the infrared light irradiated from the infrared light source 32 passes through the filter member 43 by the precise alignment of the filter member 43 and the infrared inlet 30, and is entirely introduced into the infrared inlet 30. Since it is possible, it is possible to effectively generate photoacoustics by reaction to a measurement gas and infrared rays.
  • a reflective coating unit 35 may be formed in a portion in which infrared rays pass through the inside of the infrared inlet unit 30.
  • the reflective coating unit 35 is applied to the inner wall surface of the entire portion of the infrared inlet 30 through which the infrared rays pass, and in this embodiment, the inlet hole 31a and the guide hole 33a formed in the infrared inlet unit 30 ) Is exemplarily described as being applied to the entire surface of the inner wall surface.
  • the infrared rays are incident on the infrared inlet 30, and the reflection action of the reflective coating unit 35 is generated in the process of being irradiated inside the measurement cell 13. It is possible to prevent the absorption effect from being generated in the process of passing, so that an effective irradiation action of infrared rays can be achieved.
  • the microphone 70 is installed on the side of the measurement cell 13 may be installed to sense the optical sound generated by the reaction of the infrared and the measurement gas inside the measurement cell (13).
  • the microphone 70 is installed so as to be capable of converting optical sound into an electrical signal, it is possible to check the type or concentration of the measurement gas according to the change in the electrical signal generated in the photoacoustic sound.
  • a change in size of the photoacoustic signal converted into an electrical signal occurs according to the concentration and the amount of light of the measurement gas, and it is possible to easily check the concentration or type of the measurement gas by analyzing the electrical signal converted by the microphone 70. Do.
  • the photoacoustic sound is stably irradiated to the measurement gas. It can be stably generated.

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  • Physics & Mathematics (AREA)
  • Biochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Acoustics & Sound (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

L'invention concerne un dispositif photoacoustique pour analyser un gaz dissous dans de l'huile, qui comprend : une cellule photo-acoustique dans laquelle un gaz à mesurer est injecté, la cellule photo-acoustique étant connectée à une partie d'entrée de rayonnement infrarouge à travers laquelle passe un rayon infrarouge émis vers le gaz à mesurer, un son optique provoqué par la réaction entre le gaz à mesurer et le rayon infrarouge étant généré dans la cellule photo-acoustique; une partie de filtre optique qui est installée de manière rotative sur la cellule photoacoustique et à travers laquelle passe la lumière du rayon infrarouge; une partie d'entraînement pour fournir une force d'entraînement en rotation au filtre optique; et un microphone pour convertir le son optique généré dans la cellule photo-acoustique en un signal électrique.
PCT/KR2019/013632 2018-10-30 2019-10-17 Dispositif photo-acoustique pour analyser un gaz dissous dans de l'huile Ceased WO2020091273A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2018-0131280 2018-10-30
KR1020180131280A KR102071569B1 (ko) 2018-10-30 2018-10-30 유중 가스 분석 광음향 장치

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WO2020091273A1 true WO2020091273A1 (fr) 2020-05-07

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PCT/KR2019/013632 Ceased WO2020091273A1 (fr) 2018-10-30 2019-10-17 Dispositif photo-acoustique pour analyser un gaz dissous dans de l'huile

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06194343A (ja) * 1992-09-30 1994-07-15 Gec Marconi Ltd ガス分析装置
US8322190B2 (en) * 2006-08-31 2012-12-04 Koninklijke Philips Electronics N.V. Optical cavity-enhanced photo acoustic trace gas detector with variable light intensity modulator
KR101409620B1 (ko) * 2012-12-26 2014-06-18 주식회사 아이스기술 광 정렬기능을 갖는 가스 측정장치
KR20160032863A (ko) * 2014-09-17 2016-03-25 한국과학기술연구원 적외선 가스 분석 장치
CN106198393A (zh) * 2016-09-21 2016-12-07 深圳市卓尔思科技有限公司 变压器油中溶解气体检测装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06194343A (ja) * 1992-09-30 1994-07-15 Gec Marconi Ltd ガス分析装置
US8322190B2 (en) * 2006-08-31 2012-12-04 Koninklijke Philips Electronics N.V. Optical cavity-enhanced photo acoustic trace gas detector with variable light intensity modulator
KR101409620B1 (ko) * 2012-12-26 2014-06-18 주식회사 아이스기술 광 정렬기능을 갖는 가스 측정장치
KR20160032863A (ko) * 2014-09-17 2016-03-25 한국과학기술연구원 적외선 가스 분석 장치
CN106198393A (zh) * 2016-09-21 2016-12-07 深圳市卓尔思科技有限公司 变压器油中溶解气体检测装置

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