Displacement sensor structure and testing method

Abstract

The invention provides a displacement sensor structure and a testing method, and the head shape of the displacement sensor is a step, or a rack, or an array object with equally arranged height. In a measuring process, only the step or the rack with too high head will be broken down, a gap indicated value is equal to a known height of the broken step or rack, and the indicated value has no connection with which position of the step or the rack is broken. According to the displacement sensor structure and the testing method, a measurement error caused by the fact that a cutting position and a broken position are different in existing displacement measurements is solved, and it is needless to install repeatedly so that a part of installation errors is eliminated and installation and usage areconvenient. The structure is convenient to be installed and debugged through a structural design, and the sensor structure is flexible and stretchable when debugging. The sensor structure is locked to ensure sealing, which ensures that a gap value d between high-speed relative shear moving parts is measured in severe environments such as high temperature, high speed, radiation and dust and the like, so as to improve uncertainty of a measurement and contributions are made for calibration of engine apex moving gap and high speed railway moving gap.

Description

technical field [0001] The invention belongs to the technical field of length measurement and relates to a displacement sensor structure, which is used for measuring the gap value between relatively high-speed shearing moving parts. Background technique [0002] The shear motion clearance value involved in the present invention is commonly found in the clearance value between the blade tip of a turbofan engine and the casing, the clearance value between a high-speed railway locomotive component and a guide rail, and the like. Usually, for the measurement of the gap value between relatively high-speed shearing moving parts, non-contact displacement sensors such as optical, capacitive, and eddy current are used for measurement, and are carried out in harsh environments such as high temperature, high speed, radiation, and dust. High-speed changing gap measurement (especially the minimum gap extreme value), because the gap measurement is a high dynamic measurement, limited by th...

AI Technical Summary

Problems solved by technology

Usually, for the measurement of the gap value between relatively high-speed shearing moving parts, non-contact displacement sensors such as optical, capacitive, and eddy current are used for measurement, and are carried out in harsh environments such as high temperature, high speed, radiation, and dust. High-speed changing gap measurement (especially the minimum gap extreme value), because the gap measurement is a high dynamic measurement, limited by the sampling frequency and sensor dynamic characteristics, it is not only difficult to measure the minimum gap extreme value, but also expensive, difficult to install and debug; Using the displacement sensor of the material reduction principle in the shape of a cylinder, a cuboid, etc. to measure, due to the fast impact speed, not only will it cause damage to high-speed moving parts, but also because the cutting position and fracture position of the material are different, the measurement error is also large, and When installing the existing displacement sensor based on the material reduction principle, it is necessary to repeatedly remove the displacement sensor for zero-point grinding, zero-point calibration, and scraping calibration. Each installation will introduce new installation errors and new error components, resulting in Large measurement error

Images