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一种电容式非接触角位置传感器,由外壳、转轴、金属动片、印制有电容极板的基板以及由单片机组成的信号处理电路等组成,其工作原理为:通过金属动片改变电容间的介质,从而改变电容的大小,并由单片机控制对电容进行测量、计算和输出。其结构特点是电容极板由一块或多块组成,并排列在同一平面或曲面上。其特征是在转轴上固定一个与电路完全分离的金属动片,此金属动片用于改变装置内的电容介质。由于本传感器可移动部件没有带电体的存在,所以真正地做到了非接触测量。本传感器在滑动手感,使用寿命以及分辨率等指标与光栅编码器式角位置传感器相当,但成本只有其二分之一,特别适用于需要手动操作的调音设备及游戏机外围设备。
A capacitive non-contact angular position sensor consists of a housing, a rotating shaft, a metal moving piece, a printed circuit board with a capacitor plate and a signal processing circuit composed of a single-chip microcomputer. The working principle of the capacitor is as follows: Of the medium, so as to change the size of the capacitor, controlled by the microcontroller to measure the capacitance, calculation and output. Its structure is characterized by capacitive plates composed of one or more, and arranged in the same plane or curved surface. The utility model is characterized in that a metal movable piece which is completely separated from the circuit is fixed on the rotating shaft, and the metal movable piece is used for changing the capacitive medium in the device. Due to the absence of a charged body in the movable part of the sensor, non-contact measurement is truly achieved. The sensor in sliding touch, life and resolution and other indicators and raster encoder angular position sensor, but the cost is only one-half, especially for manual operation of the tuning equipment and game peripherals.