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    • 33. 发明授权
    • Microwave sensor for determining position for displacement of a movable part, such as a valve needle
    • 微波传感器,用于确定可移动部件(例如阀针)的位移位置
    • US06359445B1
    • 2002-03-19
    • US09308472
    • 1999-05-17
    • Heinz PfizenmaierKlaus Voigtlaender
    • Heinz PfizenmaierKlaus Voigtlaender
    • G01F1700
    • G01D5/48
    • The microwave sensor produces an electrical output signal according to a position or displacement of a movable mechanical part (2), especially a valve needle in an injector valve for injecting fuel into an internal combustion engine. This position or displacement sensor includes a cavity resonator (40,70) provided with walls bounding a cavity (4,7) dimensioned for microwaves of a predetermined frequency and an antenna (8,14) for reception of the microwaves in the cavity. The end (3) of the movable mechanical part (2) protrudes into the cavity. A hybrid evaluating circuit (9) is connected with the antenna, which detects changes in the microwave radiation fed into and coupled out of the cavity, e.g. phase relationships, which depend on the position of the mechanical part (2), so that small position changes in very tight spaces are accurately determined.
    • 微波传感器根据可移动机械部件(2)的位置或位移产生电输出信号,特别是用于将燃料喷射到内燃机中的喷射阀中的阀针。 该位置或位移传感器包括空腔谐振器(40,70),空腔谐振器(40,70)设置有限定用于预定频率的微波的空腔(4,7)的壁和用于接收空腔中的微波的天线(8,14)。 可移动机械部件(2)的端部(3)突出到空腔中。 混合评估电路(9)与天线连接,该天线检测馈入和耦合出腔的微波辐射的变化。 相位关系,其取决于机械部件(2)的位置,使得在非常狭窄的空间中的小位置变化被准确地确定。