EP 0667954 A4 19951227 - SYSTEM AND METHOD FOR TESTING THE INTEGRITY OF POROUS ELEMENTS.
Title (en)
SYSTEM AND METHOD FOR TESTING THE INTEGRITY OF POROUS ELEMENTS.
Title (de)
VORRICHTUNG UND VERFAHREN ZUM TESTEN DER INTEGRITÄT PORÖSER ELEMENTE.
Title (fr)
SYSTEME ET PROCEDE DE VERIFICATION DE L'INTEGRITE D'ELEMENTS POREUX.
Publication
Application
Priority
- US 9310691 W 19931108
- US 97160592 A 19921106
Abstract (en)
[origin: WO9411721A1] An ultrasonic detection apparatus (1) is disclosed for detecting defects in filters (3). The apparatus (1) operates on a wetted filter (3) and includes a housing (2). The wetted filter (3) divides the housing (2) into an inlet side (7) and an outlet side (8). Both the inlet side (7) and the outlet side (8) may be filled with a gas as with a standard forward flow test apparatus. A microphone (4) is disposed in the vicinity of the wetted filter (3). The microphone (4) receives acoustic signals generated within the chamber (any combination of inlet side (7), outlet side (8), inlet tube (5), or outlet tube (6)) as a result of the increased pressure on the inlet side (7). A signal processing device (9) is also included for analyzing the acoustic signals received by the microphone (4) for determining whether a filter (3) is defective. The invention includes multiple methods for determining whether a filter (3) is defective. One method may include the steps of placing a wetted filter (3) in a test housing (2) to divide the test housing (2) into an inlet side (7) and an outlet side (8), pressurizing the inlet side (7) with gas, measuring both the gas flow and the sound volume on the outlet side (8), and thereby determine whether the filter (3) is defective.
IPC 1-7
IPC 8 full level
B01D 65/10 (2006.01); G01M 3/24 (2006.01); G01N 15/08 (2006.01); G01N 29/14 (2006.01); G01N 29/22 (2006.01)
CPC (source: EP)
B01D 65/102 (2013.01); B01D 65/104 (2013.01); G01M 3/24 (2013.01); G01N 15/0826 (2013.01); G01N 29/14 (2013.01); G01N 29/227 (2013.01); G01N 29/449 (2013.01); G01N 2291/02441 (2013.01); G01N 2291/0245 (2013.01); G01N 2291/02836 (2013.01); G01N 2291/02872 (2013.01); G01N 2291/02881 (2013.01)
Citation (search report)
- [A] DE 3911648 A1 19901011 - IMD INGENIEURBUERO FUER MESSTE [DE]
- [A] DE 3726585 A1 19890223 - SEBA MESS ORTUNGSTECH [DE]
- [AX] G. REICHELT: "bubble point measurements on large areas of microporous membranes", JOURNAL OF MEMBRANE SCIENCE, vol. 60, 1991, ELSEVIER SCIENCE PUBLISHERS B.V., AMSTERDAM, THE NETHERLANDS, pages 253 - 259, XP000226819, DOI: doi:10.1016/S0376-7388(00)81538-0
- See references of WO 9411721A1
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
WO 9411721 A1 19940526; CA 2148807 A1 19940526; EP 0667954 A1 19950823; EP 0667954 A4 19951227; JP H08503545 A 19960416
DOCDB simple family (application)
US 9310691 W 19931108; CA 2148807 A 19931108; EP 94900561 A 19931108; JP 51223594 A 19931108