A real-time distance measurement data processing platform for multi-axis grating interferometry type optical encoders

2019 ◽  
Author(s):  
Xinghui Li ◽  
Xiao Su ◽  
Qian Zhou ◽  
Kai Ni ◽  
Xiaohao Wang
Keyword(s):  
Data Processing ◽  
Real Time ◽  
Measurement Data ◽  
Distance Measurement ◽  
Time Distance ◽  
Processing Platform

Implementation of a data processing platform for real-time distance measurement with dual-comb lasers

2015 ◽  
Author(s):  
Kai Ni ◽  
Mingfei Xu ◽  
Qian Zhou ◽  
Hao Dong ◽  
Xinghui Li ◽  
...  
Keyword(s):  
Data Processing ◽  
Real Time ◽  
Distance Measurement ◽  
Time Distance ◽  
Processing Platform

Traffic Survey System Based on GPS, GPRS and GIS

2011 ◽  
Vol 328-330 ◽  
pp. 989-997
Author(s):  
Yuan Yuan ◽  
Zhi Yong Liu ◽  
Huai Kun Xiang ◽  
Ze Feng Ding
Keyword(s):  
Data Processing ◽  
Real Time ◽  
Survey Data ◽  
Computer Technology ◽  
Vehicle Type ◽  
Type Selection ◽  
Survey System ◽  
Research Findings ◽  
Processing Platform ◽  
Program Controller

Referring to research findings of existing traffic survey instrument, this paper bases on electronic traffic survey counter to insert GPRS module, micro-program controller, vehicle type selection keyboard and direction selection keyboard, and utilizes computer technology to establish data processing platform, studies and designs the traffic survey system on the basis of GPS, GPRS and GIS. This system can realize real-time monitoring on surveyors, accurate and timely transmission and processing of survey data, and automatic analysis and management of survey data.

scholarly journals An FPGA Platform for Next-Generation Grating Encoders

Sensors ◽  
2020 ◽  
Vol 20 (8) ◽  
pp. 2266
Author(s):  
Yaodong Han ◽  
Kai Ni ◽  
Xinghui Li ◽  
Guanhao Wu ◽  
Kangning Yu ◽  
...  
Keyword(s):  
Data Processing ◽  
Real Time ◽  
High Speed ◽  
Displacement Measurement ◽  
Time Data ◽  
Order Error ◽  
Real Time Data ◽  
Calculation System ◽  
Real Time Data Processing ◽  
Processing Platform

Among various nanometer-level displacement measurement methods, grating interferometry-based linear encoders are widely used due to their high robustness, relatively low cost, and compactness. One trend of grating encoders is multi-axis measurement capability for simultaneous precision positioning and small order error motion measurement. However, due to both lack of suitable hardware data processing platform and of a real-time displacement calculation system, meeting the requirements of real-time data processing while maintaining the nanometer order resolutions on all these axes is a challenge. To solve above-mentioned problem, in this paper we introduce a design and experimental validation of a field programmable gate array (FPGA)-cored real-time data processing platform for grating encoders. This platform includes the following functions. First, a front-end photodetector and I/V conversion analog circuit are used to realize basic analog signal filtering, while an eight-channel parallel, 16-bit precision, 200 kSPS maximum acquisition rate Analog-to-digital (ADC) is used to obtain digital signals that are easy to process. Then, an FPGA-based digital signal processing platform is implemented, which can calculate the displacement values corresponding to the phase subdivision signals in parallel and in real time at high speed. Finally, the displacement result is transferred by USB2.0 to the PC in real time through an Universal Asynchronous Receiver/Transmitter (UART) serial port to form a complete real-time displacement calculation system. The experimental results show that the system achieves real-time data processing and displacement result display while meeting the high accuracy of traditional offline data solution methods, which demonstrates the industrial potential and practicality of our absolute two-dimensional grating scale displacement measurement system.

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