Niu Wenliang

Stepper Motor Subdivided Control System Based on SOPC Technology

A stepper motor subdivided control system based on SOPC (System on a Programmable Chip) technology is designed in this paper. Using the TFG (Task Flow Graph) model, the system is designed to satisfy the requirement of some micromanipulation. The design method is based on the TFG model of the digital signal process algorithm and implemented with SOPC technology. As is known, stepper motor system consists of three parts which are control section, driver section and stepper motor. Under the analysis of the stepper motor subdivided principle which gives its precise control method, the architecture of the system and the practical driver circuit as the control circuit are provided. The Nios II CPU is selected for the SOPC system as the control core. The software flow process chart of the subdivided control according to the timing requirement of LMD18245 which is the driver chip for the stepper motor is also offered. In the end, the picture of the substance of the system is shown.

Application of fingerprint recognition on the laboratory management

Focuses on the demand of the opening administration for the laboratory in high school, combined with the fingerprint recognition technology, this paper designs a universal laboratory management system, which contains checking on work attendance, students information management, querying and course management functions. The fingerprint recognition technology is analyzed in detail. The two manners of the computer system applying the fingerprint recognition technology both verification and identification are introduced. Using fingerprint collection technique, software program and database technology, the architecture of the system and the realization method of each function are provided. The system gets a good stability and accuracy through the practical test.

An Open Laboratory Management System Based on Fingerprints Recognition

Focuses on the demand of the opening administration for the laboratory in high school, combined with the fingerprint recognition technology, this paper designs a universal laboratory management system, which contains checking on work attendance, students information management, querying, printing report sheet and course management functions. The fingerprint recognition technology is analyzed in detail. The two manners of the computer system applying the fingerprint recognition technology both verification and identification are introduced. Using fingerprint collection technique, software program and database technology, the architecture of the system and the realization method of each function are provided. The system gets a good stability and accuracy through the practical test.

Compression sampling algorithm of pipeline leak signal

A novel algorithm (Compressed Sensing, CS) for pipeline leak signal sampling and detection was proposed to resolve the problem of excessively high sampling rate of the pipeline leak signals. The algorithm is based on the sparse signals and the compressed sensing theory. It breaks through the limitation of the Shannon sampling theorem, and it implements Low-rate sampling lower than Nyquist sampling frequency, then finally realizes high precision reconstruction of the pipeline leak signal. The paper compares CS theory and traditional sampling theory and studies implementation of pipeline leak compression sampling based on CS theory, which includes: construction of the measurement matrix, selection of the sparse basis and signal-based matching pursuit reconstruction algorithm. In this paper, simulation experiment is performed for pipeline leak signal, performance indicator can be achieved by the compression sampling algorithm in conditions of different compression sampling ratio is given. The results indicate that the method proposed in this paper is correct and effective, can provide a new method for pipeline leak detection.

Design of the Different Multi-processors System Based on TFG Model

Cooperation design method based on analysis and application of TFG (task flow graphic) model is introduced for different multi-processors system used for the signal waveform scale in the both time-domain and spectrum-domain in this paper. The method is based on the TFG model of the digital signal process algorithm and implemented with multi-processors technology. The multi-processors system consists of DSP (digital signal processor), ARM (advanced RISC machine) and Nios II processors is discussed. And the whole structure of the system and the structure of each subsystem are given. Then a measurement instrument integrated with simple digital oscilloscope and spectrum analyzer using this multi-processors system is realized. Besides, the hardware architecture and software program flow chart of the real system, as well as the communication approach among the processors, are provided.

Study on the design method of different multi-processors system

Cooperation design method based on analysis and application of TFG (task flow graphic) model is introduced for different multi-processors system used for the signal waveform scale in the both time-domain and spectrum-domain in this paper. The method is based on the TFG model of the digital signal process algorithm and implemented with multi-processors technology. The multi-processors system consists of DSP, ARM and Nios II processors is discussed. And the whole structure of the system and the structure of each subsystem are given. Then a measurement instrument integrated with simple digital oscilloscope and spectrum analyzer using this multi-processors system is realized. Besides, the hardware architecture and software program flow chart of the real system, as well as the communication approach among the processors, are provided.