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    • 7. 发明授权
    • Microwave recess distance and air-path clearance sensor
    • 微波凹槽距离和气道间隙传感器
    • US5818242A
    • 1998-10-06
    • US646577
    • 1996-05-08
    • Richard R. GrzybowskiGerald Meltz
    • Richard R. GrzybowskiGerald Meltz
    • G01B15/00F01D11/02F01D11/08F01D11/12F01D21/04F02C7/00G01S13/36G01S13/88G01R27/04
    • G01B15/00F01D11/025F01D11/12F01D21/04G01S13/36F05D2260/80G01S13/88
    • A machine having protruding elements 26 and an adjacent abradable seal 18, which move relative to each other, an air-path clearance G between the seal 18 and the elements 26 and an element distance D2 between the sensor 10 and the elements 26, is provided with a sensor 10 which is recessed within the seal 18 by a recess distance D. A clearance/thickness circuit 14 provides transmitted and reflected microwave signals 30,32 along a coaxial cable 12 having a characteristic impedance, to the sensor 10, which has an impedance substantially matched to the characteristic impedance of the cable 12. The sensor 10 provides the reflected signal 32 which is indicative of the recess distance D when the elements 26 are not in front of the sensor 10 and is indicative of the blade distance D2 between the sensor 10 and the elements 26 when the elements 26 are in front of the sensor 10. The circuit 14 receives the reflected signal 32 and provides electrical signals indicative of the recess distance D and/or the air-path clearance G. Alternatively, the circuit 14 may provide only the recess distance D. The sensor 10 provides such measurements whether or not the machine is operating.
    • 提供具有突出元件26和相对于彼此移动的相邻的可磨损密封件18的机器,密封件18和元件26之间的空气通道间隙G以及传感器10和元件26之间的元件距离D2。 其中传感器10在密封件18内凹入凹陷距离D。间隙/厚度电路14沿着具有特征阻抗的同轴电缆12向传感器10提供传输和反射的微波信号30,32,传感器10具有 阻抗基本上与电缆12的特性阻抗匹配。传感器10提供反射信号32,该信号指示当元件26不在传感器10的前面时的凹陷距离D,并且指示在距离 传感器10和元件26,当元件26位于传感器10的前面时。电路14接收反射信号32并提供指示凹陷距离D an的电信号 d /或空气通道间隙G.或者,电路14可以仅提供凹部距离D.传感器10提供这样的测量,无论机器是否正在操作。