发明名称 |
Soot detector for engine oil |
摘要 |
A method and apparatus for detecting the concentration of soot particles in engine oil. A microwave signal having a varying frequency is applied to a transmission line having a probe tip exposed to the engine oil. A voltage is read at a stationary detection point along the length of the transmission line for each applied frequency. The applied frequency when the probe voltage is equal to a null voltage of a standing wave within the transmission line is compared to a reference frequency determined when the probe voltage is equal to a null voltage for a known concentration of soot particles. The concentration is calculated based upon the result of the comparison. Preferably, a reference probe receives the same input signal. A known relationship between the reference probe and the transmission line is then used to eliminate temperature effects on the applied frequency.
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申请公布号 |
US6891383(B2) |
申请公布日期 |
2005.05.10 |
申请号 |
US20030649531 |
申请日期 |
2003.08.27 |
申请人 |
DELPHI TECHNOLOGIES, INC. |
发明人 |
NICHOLSON WARREN BAXTER;NAGY LOUIS L. |
分类号 |
G01N22/00;G01N33/28;G01R27/08;(IPC1-7):G01R27/08 |
主分类号 |
G01N22/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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