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    • 1. 发明申请
    • SOOT DETECTOR FOR ENGINE OIL
    • 发动机油检测仪
    • US20050057267A1
    • 2005-03-17
    • US10649531
    • 2003-08-27
    • Warren NicholsonLouis Nagy
    • Warren NicholsonLouis Nagy
    • G01N22/00G01N33/28G01R27/08
    • G01N33/2888G01N22/00
    • 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.
    • 用于检测发动机油中烟灰颗粒浓度的方法和装置。 具有变化频率的微波信号被施加到具有暴露于发动机油的探针尖端的传输线。 在每个施加的频率沿着传输线的长度在固定检测点处读取电压。 当探测电压等于传输线内的驻波的零电压时的施加频率与当已知浓度的烟灰颗粒的探针电压等于零电压时确定的参考频率进行比较。 根据比较结果计算浓度。 优选地,参考探针接收相同的输入信号。 然后使用参考探针和传输线之间的已知关系来消除对所施加的频率的温度影响。