US Patent No: 7,391,035
Number of patents in Portfolio can not be more than 2000
Method and device for monitoring oil oxidation in real time by measuring fluorescence
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Jun 24, 2008
Issued date -
Apr 18, 2006
filing date -
11/407,404
serial no -
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Abstract
There is provided a method and a device of monitoring oil oxidation in real time. The method of the present invention comprises the steps of: irradiating ultraviolet light into oil to be monitored; measuring fluorescence emission intensity of the oil in red, green and blue wavelength bands; determining one value measured in a relatively long wavelength band and the other value measured in a relatively short wavelength band among the fluorescence emission intensity measured in the red, green and blue wavelength bands; calculating a fluorescence emission ratio which is defined as a ratio of the value measured in the relatively long wavelength band to the value measured in the relatively short wavelength band; and monitoring a change in the fluorescence emission ratio. It is then determined whether the fluorescence emission ratio reaches a predetermined critical magnitude. When the fluorescence emission ratio reaches the critical magnitude, the necessity of replacing the oil with new one is indicated.
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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 6,842,234 Apparatus for measuring soot content in diesel engine oil in real time | 1 | 2002 | |
| 7,136,155 Apparatus for measuring oil oxidation using fluorescent light reflected from oil | 3 | 2004 | |
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| 5,980,992 Fluorochemical treatments to provide low-energy surfaces | 22 | 1997 | |
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| 6,633,043 Method for characterization of petroleum oils using normalized time-resolved fluorescence spectra | 10 | 2002 | |
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| 6,459,995 Electrical measurement of oil quality | 38 | 2000 | |
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| 4,814,614 Method for characterizing oil-bearing inclusions via fluorescence microspectrophotometry | 21 | 1987 | |
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| 5,780,850 API estimate using multiple fluorescence measurements | 6 | 1996 | |
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| 5,789,665 Oil quality sensor for use in a motor | 49 | 1996 | |
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