A New On-Line Visual Ferrograph

An on-line visual ferrograph (OLVF) characterized by direct reading and on-line analysis was developed based on magnetic deposition and image analysis. A digital sensor was integrated with a CMOS image sensor to obtain images of deposited wear debris under illumination conditions. An electromagnetic...

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Bibliographic Details
Published in:Tribology transactions Vol. 52; no. 5; pp. 623 - 631
Main Authors: WU, T. H., MAO, J. H., WANG, J. T., WU, J. Y., XIE, Y. B.
Format: Journal Article
Language:English
Published: Philadelphia, PA Taylor & Francis Group 01.09.2009
Taylor & Francis
Taylor & Francis Inc
Subjects:
Applied sciences
Atoms & subatomic particles
Electromagnetism
Exact sciences and technology
Ferrography
Friction, wear, lubrication
Image Analysis
Industrial metrology. Testing
Machine components
Mechanical engineering. Machine design
Sensors
Tribology
Wear Particle Analysis
Lubricating oil
Magnetic flux
Image analysis
Wear Particle Analysis
Pipe flow
Wear particle
Image processing
Ferrography
Measurement sensor
Sampling
Experimental study
Tribology
ISSN:1040-2004, 1547-397X
Online Access:Get full text
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Summary:An on-line visual ferrograph (OLVF) characterized by direct reading and on-line analysis was developed based on magnetic deposition and image analysis. A digital sensor was integrated with a CMOS image sensor to obtain images of deposited wear debris under illumination conditions. An electromagnetic instrument was designed to deposit the wear debris flowing through an oil flow channel. The oil flow channel, fixed on the electromagnet, was arranged parallel to the magnetic flux in the air gap between two electromagnet poles. The deposition effect on wear debris was analyzed theoretically. The result shows that the wear debris in different sizes can be deposited in the same zone by controlling the oil flow rate and magnet field intensity. Corresponding application software for image sampling and processing was developed. An index of relative wear debris concentration, IPCA (Index of Particle Coverage Area), is given as an output in addition to wear debris images. Finally, two kinds of experiments were specified to assess the effect and validity of the OLVF. The results show that the OLVF has effective deposition and identification for both relatively large and small wear debris with rational control parameters. The validity examinations with the commercial particle quantifier (PQ) and direct reading ferrograph (DR) show that the OLVF has an approaching trend to the reference instruments in both heavily and lightly contaminated oil.
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ISSN:1040-2004
1547-397X
DOI:10.1080/10402000902825762