The uniform speed of the magnetic field is directly influenced by the quality of the exciting signals for time grating sensors,which determines the measurement accuracy of the time grating sensors.Therefore,the highqu...The uniform speed of the magnetic field is directly influenced by the quality of the exciting signals for time grating sensors,which determines the measurement accuracy of the time grating sensors.Therefore,the highquality exciting signals are of great significance to the measurement accuracy improvement of the time grating sensors.Regarding the high requirements on quadrature exciting signal sources for linear time grating sensors,a direct digital frequency synthesis technique is employed to design the quadrature exciting signals.In addition,an active band-pass filter is designed to eliminate the interference and improve the signal quality.The frequency and the phase of the proposed quadrature exciting signal sources can easily adjust,and the precision of the signals is high.The exciting signal sources and the signal processing circuits are integrated into one FPGA chip,which greatly decrease the size of the circuit board and improve the reliability.Simulation and experiment results prove the validity.This design method can be widely applied into many applications which require high quality of exciting signal sources.展开更多
The transformation between time and space is discussed. To improve real-time response speed of intelligent measuring system, the concept of exchanging program execution time with more circuitry is presented working in...The transformation between time and space is discussed. To improve real-time response speed of intelligent measuring system, the concept of exchanging program execution time with more circuitry is presented working in cycle mode. Displacement measuring by magnification is achieved with period measurement by magnification. To change the condition that traditional precision measurement depends on machining precision greatly, the concept of measuring space with time and theory of time-space coordinate transformation are proposed. Guided by the idea of measuring space with time, differential frequency measurement system and time grating displacement sensor are developed based on the proposed novel methods. And high-precision measurement is achieved without high-precision manufacture, which embeds the remarkable characteristics of low cost but high precision to the devices. Experiment and test results conform the validity of the proposed time-space concept.展开更多
A novel time/wavelength-multiplexed fiber Bragg grating sensor array is presented. This type of sensor array has the advantages of more points for multi-point measurement, simple structure and low cost.
基金funded by National Natural Science Foundation of China(No.51775075)Natural Science Foundation of Chongqing(No.cstc2016jcyj A0505)
文摘The uniform speed of the magnetic field is directly influenced by the quality of the exciting signals for time grating sensors,which determines the measurement accuracy of the time grating sensors.Therefore,the highquality exciting signals are of great significance to the measurement accuracy improvement of the time grating sensors.Regarding the high requirements on quadrature exciting signal sources for linear time grating sensors,a direct digital frequency synthesis technique is employed to design the quadrature exciting signals.In addition,an active band-pass filter is designed to eliminate the interference and improve the signal quality.The frequency and the phase of the proposed quadrature exciting signal sources can easily adjust,and the precision of the signals is high.The exciting signal sources and the signal processing circuits are integrated into one FPGA chip,which greatly decrease the size of the circuit board and improve the reliability.Simulation and experiment results prove the validity.This design method can be widely applied into many applications which require high quality of exciting signal sources.
基金National Natural Science Foundation of China(No.59575095,No.59675089,No.50075091,No.50575235)
文摘The transformation between time and space is discussed. To improve real-time response speed of intelligent measuring system, the concept of exchanging program execution time with more circuitry is presented working in cycle mode. Displacement measuring by magnification is achieved with period measurement by magnification. To change the condition that traditional precision measurement depends on machining precision greatly, the concept of measuring space with time and theory of time-space coordinate transformation are proposed. Guided by the idea of measuring space with time, differential frequency measurement system and time grating displacement sensor are developed based on the proposed novel methods. And high-precision measurement is achieved without high-precision manufacture, which embeds the remarkable characteristics of low cost but high precision to the devices. Experiment and test results conform the validity of the proposed time-space concept.
基金Supported by Beijing Education Administration Foundation (00KG040)
文摘A novel time/wavelength-multiplexed fiber Bragg grating sensor array is presented. This type of sensor array has the advantages of more points for multi-point measurement, simple structure and low cost.
