Design Of Linear Time-grating Displacement Sensor With Double-layer Structure

Displacement sensor is an important medium for obtaining displacement information,which can be used in a wide range of fields,such as CNC machine tools,missiles,aerospace rockets and so on.The development of displacement sensors determines the degree of modernization of precision displacement measurement.However,the degree of development of precision displacement measurement in a country also affects the innovation of displacement sensors,and the two influence each other.The traditional displacement sensor is represented by the grating,whose technology is controlled by people,and the price is generally high,all of which originates from abroad.However,the linear time grating sensor(time measurement space)independently developed by our country has a short production cycle,low price and simple production.However,most of the current linear time grating sensors are single-layered,and there are problems such as weak sensing signals and end effects.Therefore,in order to solve the problems of the linear time grating sensor with the single-layer structure,the research on the linear time-grating sensor with the double-layer structure has been carried out.The main contents are:(1)Combined the electromagnetic field theory and analyzing the magnetic field distribution of the coil,based on the "time-grating theory" and the electromagnetic field theory,a model of the linear time-grating displacement sensor with a double-layer structure is established,and it is compared with the linear time-grating sensor with a single-layer structure.Displacement sensor models are compared.(2)Firstly,the concept of double-layer is explained,and then the electromagnetic simulation model of the linear time-grating displacement sensor with double-layer structure is constructed and the finite element simulation is carried out to verify the structural feasibility of the linear time-grating sensor with double-layer structure and the increase in the intensity of the induction signal.According to the simulation results,the main harmonic error components of the displacement measurement error are analyzed.(3)Designing the drive circuit of the linear time-grating displacement sensor with double-layer structure.The drive circuit uses EP4CE10F1717 N as the controlling core to generate the excitation signal,which mainly includes the hardware circuit and software design of excitation signal generation and data acquisition.At the same time,a double-layer structure of the linear time-grating displacement sensor's excitation winding and a double-layer structure PCB(Printed Circuit Board)coil of the induction winding were designed,and a prototype of the double-layer structure of the linear time-grating displacement sensor was produced.(4)The experimental platform of the linear time-grating displacement sensor with double-layer structure was built,and the excitation signal and traveling wave were tested,compared with the simulation model,error analysis was carried out,and then the error correction experiment was carried out,and the stability experiment was carried out at the same time.The experimental results show that the linear time-grating displacement sensor with double-layer structure can realize linear displacement measurement,and the induction signal strength was increased,eliminating the end effect,and the measurement accuracy of the sensor prototype is ±16?m in the range of 0?280mm.