Chen Wengang

Design of weighing transmitter in corn yield measurement system

To reduce the interference and improve the weighing precision, a kind of weighing transmitter based on MSP430 Micro-Controller Unit (MCU), which is applicable to resistance strain sensor, is designed for corn yield measurement system and its hardware diagram and software design are given in detail. The design takes full advantage of 24-bit Analog to Digital Converter (ADC) ADS1232 to sample the output of weighing transducer, and weighted average method is used to process data. By comparing the results derived from weighted average method and arithmetic average method, it prove that the former is superior to the latter.

Teaching software development of digital image processing based on VB

In order to make the student easily understand the image processing theory and combine theory teaching with practical teaching of this technology, it is very important to develop a set of software suitable for teaching. This paper discusses image processing technique based on Visual Basic (VB) and a set of teaching software of digital image processing is developed by this technique. This software can successfully realize some image processing algorithm and has the features with easy operability, beautiful user interface and good vision. Practice demonstrates that the effect of teaching is improved by this software. The practical application ability of students is enhanced and the teaching target of combining theory with practice is achieved by this software. At the same time, learning interest of student is also increased.

Teaching software design of particles size measurement with mircoscope image

In order to make the student easily understand the particles measurement principles of microscope image and cooperate with the theory teaching and practical teaching of this technology. A set of software design which set theory teaching and practical teaching in one is given. This particles measurement software was designed by GUI of MATLAB. It can successfully calculate the size and number of particles by some image process. The software has the features with easy operability, friendly user interface. Practice demonstrates that the effect of teaching is improved, the quality of software program and the practical application ability of students are enhanced, and the teaching target of combining theory with practice is achieved by this software. At the same time, learning interest of student is also increased.

Multimedia courseware design of real-time computing power based on Powerpoint and MATLAB

In order to easily realize real-time computing power of multimedia courseware of PowerPoint, a multimedia courseware design method of is presented. This method designs the courseware based on the technology combining PowerPoint and MATLAB. This technology can realize data exchange of PowerPoint and MATLAB by ActiveX automation. By this technology, data of PowerPoint can sent to MATLAB workspace, complex calculation is completed by MATLAB, and then calculated data sent back PowerPoint again. Practice demonstrates that multimedia courseware designed by this technology has real-time computing power, friendly user interface, good interaction and its programming is very simple.

Inversion algorithm of photon correlation spectroscopy by combining linear and nonlinear estimation

Double exponential algorithm of photon correlation spectroscopy (PCS) is realized by the nonlinear estimation, its inversion accuracy is affected by four initial parameters choice. According to linear relationship of the decay linewidth distribution coefficients and exponential terms of autocorrelation function (ACF), a new inversion algorithm combining linear and nonlinear estimation is proposed. By changing four parameters optimization problem into two parameters optimization problem in turns, new algorithm improves the inversion accuracy and reduces two initial parameters. By new and tradition algorithm, ACF of 200nm – 600nm bi-dispersed particles is respectively inversed. For noise-free ACF, inversion error of new algorithm is 0, which is at least better than tradition algorithm 2.01%. For inversion of noise ACF, compared with tradition algorithm, new algorithm can reduce inversion error by 0.93% ∼ 6.43%. Therefore, new algorithm is superior to tradition algorithm in inversion accuracy and tolerance of noises.