PARKER压力传感器专业技术讲解

PARKER压力传感器的能源输入及信号输出是由两组带间隙的特殊环形旋转变压器承担的，因此可实现能源及信号的无接触传递。该应变传感器测量原理如图2所示。 在一段特制的弹性轴上粘贴的测扭应变片并组成电桥，以形成基础扭矩传感器，然后在轴上再固定能源环形旋转变压器的次级线圈、轴上印刷电路板和信号环旋转变压器的初级线圈。电路板上包含整流稳压电源、仪表放大电路及V／F变换电路。在传感器的外壳上固定着激磁电路、能源环形旋转变压器的初级线圈、信号环形变压器的次级线圈及信号处理电路。 传感器电路部分在工作时，由外部电源向传感器提供%26;#177;15V电源，激磁电路中的晶体振荡器产生400Hz的方波，经过TDA2003功率放大即产生交流激磁功率电源，通过能源环形旋转变压器从静止的初级线圈T1传递至旋转的次级线圈T2， 然后将得到的交流电源通过轴上的整流、滤波电路处理后变成%26;#177;5V的直流电源。按信号形式的不同，转速传感器可分为模转速传感器拟式和数字式两种。前者的输出信号值是转速的线性函数,后者的输出信号频率与转速成正比,或其信号峰值间隔与转速成反比。

PARKER压力传感器的读数盘和测量盘有间隔相同的缝隙。测量盘随被测物体转动，每转过一条缝隙，从光源投射到光敏元件（见光电式传感器）上的光线产生一次明暗变化,光敏元件即输出电流脉冲信号（图1）。反射式光电传感器在被测转轴上设有反射记号，由光源发出的光线通过透镜和半透膜入射到被测转轴上。转轴转动时，反射记号对投射光点的反射率发生变化。反射率变大时，反射光线经透镜投射到光敏元件上即发出一个脉冲信号；反射率变小时，光敏元件无信号。在一定时间内对信号计数便可测出转轴的转速值。
PARKER压力传感器由两块固定金属板和与转动轴相连的可动金属板构成。可动金属板处于电转速传感器容量zui大的位置，当转动轴旋转180°时则处于电容量zui小的位置。电容量的周期变化速率即为转速。可通过直流激励、交流激励和用可变电容构成振荡器的振荡槽路等方式得到转速的测量信号。介质变化型是在电容器的两个固定电极板之间嵌入一块高介电常数的可动板而构成的。可动介质板与转动轴相连，随着转动轴的旋转，电容器板间的介电常数发生周期性变化而引起电容量的周期性变化，其速率等于转动轴的转速。

PARKER压力传感器设计将接收器的放大器调制到发射器的频率，使得系统只能对以此频率振动的光信号进行放大。经过调制的接收器能忽略周围的光和电磁干扰信号（太阳光，灯光，变频器等），只对自己的光或具有相同调制频率的光做出响应，因而大大提高了传感器的抗干扰性和可靠性。

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