[특허]Integrity test for porous structures using acoustic emission

Integrity test for porous structures using acoustic emission 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01N-021/85
출원번호	US-0459576 (1995-06-02)
발명자 / 주소	Bejtlich III Chester L. (Reading MA)
출원인 / 주소	Millipore Investment Holdings Limited (Wilmington DE 02)
인용정보	피인용 횟수 : 28 인용 특허 : 0

초록 ▼

A rapid, highly sensitive determination, in-situ, of the integrity and/or pore size distribution of a porous membrane structure (e.g. a pleated membrane filter cartridge) is disclosed. The identification of the integrity and/or pore size characteristics involves interpreting the residence time distribution (RTD) of the membrane structure under test and includes using a tracer gas in mixture with a carrier gas as part of a diffusion or bubble-point test. The tracer gas mixture exiting the downstream surface of the membrane becomes moisturized and is excited with a pulsed (or otherwise modulated) light source at a wavelength corresponding to the absorption line of the tracer gas. The frequency of modulation is chosen such that the tracer gas preferentially generates a photo-acoustic emission while the emission due to the absorption of water present is suppressed. The detected pressure pulse is processed to produce electrical signals indicative of the concentration of tracer gas that passes through the membrane. A non-integral (or incorrect pore size) device will demonstrate a characteristic RTD that differs from an integral (or correct pore size) device in either/or (or both) the onset time prior to tracer gas detection and the rate of change of tracer gas concentration with time.

대표청구항 ▼

A process for determining the integrity and/or pore size characteristic of a porous membrane structure alone or in a fabricated device comprising: wetting said membrane structure with a liquid to fill the pores of the membrane structure; placing said liquid-filled membrane structure in an ambient air environment; introducing a challenge gas mixture in proximity to a first surface of said membrane structure, said mixture being applied under pressure to said first surface to cause said gas mixture to migrate through the pores of said membrane structure and to exit from a second surface thereof as a moisturized gas mixture into said ambient air environment; exciting within said ambient air environment said moisturized gas mixture after it exits said second surface with a light beam having a wavelength that is absorbed by one or more components of said moisturized gas mixture; modulating said light beam at a frequency so that a component of interest within said one or more components of said moisturized gas mixture preferentially generates an acoustic emission; detecting said acoustic emission; and generating an electrical signal proportional to said acoustic emission.

이 특허를 인용한 특허 (28)

Hao, Jibin; Giglia, Salvatore; Joens, Michael; Tuccelli, Ronald, Accelerated mixed gas integrity testing of porous materials.
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Scheufler Fred G. ; Scheufler Richard D. ; Bayard William H. ; Rajasinghe Nimalakirthi, Continuous emissions monitoring system.
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Wilf, Mark; Franks, Rich; Bartels, Craig; Ikeyama, Norio, Device for measuring permeate flow and permeate conductivity of individual reverse osmosis membrane elements.
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Wood, Stewart P.; Heeschen, William A., Filter and membrane defect detection system.
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DiLeo, Anthony, Filter with memory, communication and concentration sensor.
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DiLeo, Anthony; Hubbard, John Dana, Filter with memory, communication and pressure sensor.
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DiLeo, Anthony; Hubbard, John Dana, Filter with memory, communication and pressure sensor.
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Hunt, Stephen G., Filtration cartridge formed of stacked plates.
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Slater, Kenneth; Darring, Michael T.; Baranowski, Marian, High pressure screen flow-through testing device.
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Jornitz, Maik; Meyer, Jens, Method and apparatus for carrying out integrity tests of a non-wetted filter element.
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Cho, Jaeweon; Lee, Sangyoup; Cho, Youngho, Method and apparatus for determining membrane pore size distribution.
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Ganzi, Gary C., Method and apparatus for evaluating a membrane.
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Veronesi William A. ; Olender Frederick T. ; Hart Richard A., Method and apparatus to diffract multiple beams.
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Grummert,Ulrich; Pahl,Ina, Method for carrying out an integrity test for filter elements.
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Sugiyama, Tomio; Miyamura, Yasushi; Inada, Hiromi; Hori, Kouji; Matsubara, Kazuo, Method of detecting defects in honeycomb structural body.
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DiLeo, Anthony, Method of maintaining a protein concentration at a tangential flow filter.
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Lewnard, John J.; Giglia, Salvatore; Krishnan, Mani, Methods and systems for integrity testing of porous materials.
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Rajagopalan,Nandakishore; Rusk,Todd N.; Sanford,Robert A., Methods and systems for membrane testing.
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Rajagopalan,Nandakishore; Rusk,Todd N.; Sanford,Robert A., Methods and systems for membrane testing.
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Yonak Serdar H. ; Dowling David R., Multiple microphone photoacoustic leak detection and localization system and method.
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Veronesi William A. ; Olender Frederick T. ; Hart Richard A., Photo-acoustic leak detection system.
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Olender Frederick T. ; Woody Bernard A. ; Newman Leon A., Photo-acoustic leak detector with improved signal-to-noise response.
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Selbie Michael R. L. ; Drummond Humphrey J. J.,GBX ; Johnson Warren T.,AUX, Predicting logarithmic reduction values.
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Burke, Aaron; Gagne, Jr., George A.; Wheeler, Robert, Rapid integrity testing of porous materials.
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Ikeyama, Norio; Wilf, Mark, Reverse osmosis filtration devices with RFID tag-powered flow and conductivity meters.
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Padgett, William Brandon; Kesler, Ralph Steven; Cameron, Michael E.; Horton, Roger D., System and a method for detecting fiber damage in a dialyzer.
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Wood, Stewart P.; Broomall, Charles F., System and method for analyzing pore sizes of substrates.
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Mueller Eric R. ; Hart Richard A. ; Veronesi William A. ; Olender Frederick T., System to control the power of a beam.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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연합인증

Integrity test for porous structures using acoustic emission 원문보기

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Integrity test for porous structures using acoustic emission 원문보기

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