描述
位移传感器又称为线性传感器，是一种属于金属感应的线性器件，传感器的作用是把各种被测物理量转换为电量。在生产过程中，位移的测量一般分为测量实物尺寸和机械位移两种。按被测变量变换的形式不同，位移传感器可分为模拟式和数字式两种。模拟式又可分为物性型和结构型两种。常用位移传感器以模拟式结构型居多，包括电位器式位移传感器、电感式位移传感器、自整角机、电容式位移传感器、电涡流式位移传感器、霍尔式位移传感器等。数字式位移传感器的一个重要优点是便于将信号直接送入计算机系统。这种传感器发展迅速，应用日益广泛。位移是和物体的位置在运动过程中的移动有关的量，位移的测量方式所涉及的范围是相当广泛的。小位移通常用应变式、电感式、差动变压器式、涡流式、霍尔传感器来检测，大的位移常用感应同步器、光栅、容栅、磁栅等传感技术来测量。其中光栅传感器因具有易实现数字化、精度高（目前分辨率最高的可达到纳米级）、抗干扰能力强、没有人为读数误差、安装方便、使用可靠等优点，在机床加工、检测仪表等行业中得到日益广泛的应用。
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