公开(公告)号：US20140252210A1

公开(公告)日：2014-09-11

申请号：US13789779

申请日：2013-03-08

Applicant: MESSIER-DOWTY INC.

Inventor： Kyle Schmidt

IPC: G01B11/16

CPC classification number: H03K17/945 ,  G01K11/32 ,  G01V3/08 ,  H03K2217/95

Abstract: A proximity sensor for detecting non-contact detection of a target using a fibre optic strain sensor and a system for operating multiple such proximity sensors is disclosed. The proximity sensor includes an optic fibre that has an optic fibre strain sensor that is coupled to a mass that moves in response to the target. The mass can be a magnet that moves when a ferrous target is within the magnetic field of the magnet causing the magnet to move and apply strain to the optic fibre strain sensor. The optic strain sensor can include periodic variation in the refractive index of the optic fibre, such as a fibre Bragg grating. The proximity sensor can include a second fibre optic sensor that is sensitive to temperature or a second fibre optic strain sensor coupled to a second magnet that operates in opposition to the first magnet. A system coupling multiple proximity sensors can include an interrogator that has an optical power source and a detector, each coupled to a processor. The processor compares frequency information from the proximity sensor to a threshold to determine whether a target is in proximity to its corresponding proximity sensor.

Abstract translation: 公开了一种用于使用光纤应变传感器和用于操作多个这种接近传感器的系统来检测目标的非接触检测的接近传感器。 接近传感器包括具有光纤应变传感器的光纤，光纤应变传感器耦合到响应于目标移动的质量块。 质量可以是当铁质靶位于磁体的磁场内时使磁体移动并施加应变到光纤应变传感器的磁体。 光学应变传感器可以包括光纤的折射率的周期性变化，例如光纤布拉格光栅。 接近传感器可以包括对温度敏感的第二光纤传感器或耦合到与第一磁体相对操作的第二磁体的第二光纤应变传感器。 耦合多个接近传感器的系统可以包括具有光功率源和检测器的询问器，每个耦合到处理器。 处理器将来自接近传感器的频率信息与阈值进行比较，以确定目标是否在其相应的接近传感器附近。