CA2117871A1 - Detection of Particles in a Fluid - Google Patents
Detection of Particles in a FluidInfo
- Publication number
- CA2117871A1 CA2117871A1 CA 2117871 CA2117871A CA2117871A1 CA 2117871 A1 CA2117871 A1 CA 2117871A1 CA 2117871 CA2117871 CA 2117871 CA 2117871 A CA2117871 A CA 2117871A CA 2117871 A1 CA2117871 A1 CA 2117871A1
- Authority
- CA
- Canada
- Prior art keywords
- field
- coil
- ferromagnetic
- fluid
- coils
- 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.)
- Granted
Links
Landscapes
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
A device to detect the presence of particles, principally metallic particles, in fluid lines. The fluid to be sampled flows through a former on which is wound a coil assembly comprising a sensor coil flanked upstream and downstream by two field coils. The former is constructed with a double wall and air gap such that pressure fluctuations in the fluid are not transmitted to the coil assembly to adversely affect the positions and readings of the coils. The field coils are driven by a high frequency signal derived from a crystal oscillator and the upstream and downstream sections are wound in opposite directions such that the magnetic field from each section is cancelled out in the plane of the sense coil. When a ferromagnetic or conductive particle passes through the winding structure, the coupling in the sense coil is disturbed as the particle first interacts with the field in the upstream section of the field coil and later with the field in the downstream section of the field coil as it passes through the Sensor Coil Assembly (SCA). A characteristic signature is generated in the sense coil which results from the vector summation of these transient imbalance signals with the steady-state signal from the opposed field coils. Analysis of the phase of this signature can be used to detect and distinguish between the presence of ferromagnetic and non-ferromagnetic conductive particles. Since ferromagnetic and non-ferromagnetic conductive particles interact with the field via permeability and eddy current effects respectively, the transient phase signature has a characteristic lag-lead or lead-lag sequence depending on the nature of the particle.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/143,661 | 1993-11-01 | ||
US08/143,661 US5444367A (en) | 1992-04-06 | 1993-11-01 | Method and apparatus for detecting particles in a fluid having coils isolated from external vibrations |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2117871A1 true CA2117871A1 (en) | 1995-05-02 |
CA2117871C CA2117871C (en) | 1997-09-23 |
Family
ID=22505034
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA 2117871 Expired - Fee Related CA2117871C (en) | 1993-11-01 | 1994-10-11 | Detection of particles in a fluid |
Country Status (1)
Country | Link |
---|---|
CA (1) | CA2117871C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN117929217A (en) * | 2024-03-22 | 2024-04-26 | 宁德时代新能源科技股份有限公司 | Magnetic particle content detection system and detection method |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102818754B (en) * | 2012-09-06 | 2014-08-27 | 爱德森(厦门)电子有限公司 | Method and device of improving online monitoring accuracy of engine oil metal abrasive particles |
-
1994
- 1994-10-11 CA CA 2117871 patent/CA2117871C/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN117929217A (en) * | 2024-03-22 | 2024-04-26 | 宁德时代新能源科技股份有限公司 | Magnetic particle content detection system and detection method |
Also Published As
Publication number | Publication date |
---|---|
CA2117871C (en) | 1997-09-23 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |