Automatic Control and Real-Time Monitoring of Laser Cleaning and Laser Ablation

1998 ◽  
Vol 526 ◽  
Author(s):  
Y.F. Lu ◽  
M. Meng ◽  
M.H. Hong ◽  
T.S. Low ◽  
D.S.H. Chan
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Real Time ◽  
Excimer Laser ◽  
Automatic Control System ◽  
Surface Cleaning ◽  
Laser Cleaning ◽  
Laser Surface ◽  
Feedback Signal ◽  
Real Time Monitoring

AbstractClosed-loop control and real-time monitoring of pulsed excimer laser cleaning and ablation have been realised by software and hardware design and development. The audible acoustic wave generated during excimer laser surface cleaning and ablation has been used as the feedback signal for the automatic control system of laser-surface interaction. Man–machine interface for laser operation and acoustic monitoring has been developed with LabVIEW 4.1 under Windows 95 environment. This system has been used to control and monitor laser cleaning and ablation processes in real-time and proven to successfully meet the requirements in our study. By database exchange, this automatic control system can also be applied to control drilling and materials removing.

Acoustic Emission in Laser Surface Cleaning for Real-Time Monitoring

1995 ◽  
Vol 34 (Part 2, No. 11B) ◽  
pp. L1557-L1560 ◽  
Author(s):  
Yong-Feng Lu ◽  
Yoshinobu Aoyagi
Keyword(s):  
Acoustic Emission ◽  
Real Time ◽  
Surface Cleaning ◽  
Laser Surface ◽  
Real Time Monitoring

Real-Time Monitoring and Automatic Control for Aerosol Cultivation of Lettuce

2014 ◽  
Vol 678 ◽  
pp. 299-304
Author(s):  
Bao Guo Yao ◽  
Zhe Feng Zhang
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Real Time ◽  
Nutrient Solution ◽  
Control Method ◽  
Ph Value ◽  
Agricultural Science ◽  
Monitoring And Control ◽  
Real Time Monitoring ◽  
And Control

The automatic monitoring and control method for aerosol cultivation of lettuce was proposed by real-time monitoring and automatic control of the cultivation environment, on-line detection and automatic control of nutrient solution, and the combination of field control and remote control, which has realized the intelligent management of aerosol cultivation of lettuce based on plant factory. The monitoring and control system of aerosol cultivation, the control model for the spray frequency of nutrient solution and the fuzzy control method for the pH value control of nutrient solution were introduced. The control system has been applied in the agricultural science and technology park, and the results show that the aerosol cultivation of lettuce has advantages over the traditional method.

Laser surface cleaning and real-time monitoring

2000 ◽  
Author(s):  
Yongfeng Lu ◽  
Wen D. Song ◽  
H. M. Hong ◽  
Yuan W. Zheng
Keyword(s):  
Real Time ◽  
Surface Cleaning ◽  
Laser Surface ◽  
Real Time Monitoring

Automatic Control System for the Process Parameters of the Soakage Agent in Glass Fiber Production

2011 ◽  
Vol 383-390 ◽  
pp. 4246-4250
Author(s):  
Mu Cheng Zhu ◽  
Shi Liang Nie ◽  
Ya Ping Wang ◽  
Yong Jiang ◽  
Jiong Guo
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Glass Fiber ◽  
Real Time ◽  
Automatic Control System ◽  
Process Parameters ◽  
Fiber Quality ◽  
Level Control ◽  
Fiber Production ◽  
The Stability

Soakage agent in glass fiber production is critically, the stability of its quality is directly related to the stability of the glass fiber quality. According to the characteristics of the soakage glass in fiber agent production process, this paper is mainly introduced the multi-sensor information collection for the soakage agent process parameters, and is proposed to use PLC programming, PID control and fuzzy control harmony methods to achieve the real-time automatic control preparation process of the soakage agent in adding water of amount, adding oil of amount, temperature control, liquid level control, viscosity test and many other parameters . The practical application of the automatic control system is reliable, accurate, real time.

Real-Time Monitoring for Laser Surface Cleaning

1994 ◽  
Vol 354 ◽  
Author(s):  
Y.F. Lu ◽  
M.H. Hong ◽  
Y. Aoyagi
Keyword(s):  
Acoustic Wave ◽  
Real Time ◽  
Laser Irradiation ◽  
Frequency Spectrum ◽  
Acoustic Waves ◽  
Surface Condition ◽  
Surface Cleaning ◽  
Laser Cleaning ◽  
Cleaning Process ◽  
Real Time Monitoring

AbstractReal-time monitoring of surface cleanness in laser dry cleaning was investigated by monitoring the acoustic waves emitted from the substrate surface under pulsed laser irradiation. It is found that the acoustic wave from the surface under laser irradiation can reflect the surface condition, i.e., the surface cleanness. Besides the surface condition, the acoustic waveforms also depend on the substrate materials and laser pulse energies (intensities). The frequency spectrum obtained from the Fourier transform can provide clear indication for different surface cleanness. Removing of surface contaminants can generally result in weaker laser-induced acoustic wave and change in the frequency spectrum. The surface cleanness, therefore, can be monitored in real-time by detecting the amplitude and frequency of the acoustic wave during the laser cleaning process. This phenomenon provides the laser cleaning technique a real-time feedback during the cleaning process.

scholarly journals СПЕКТРАЛЬНЫЕ ПЛОТНОСТИ РЕГУЛИРУЕМЫХ ПЕРЕМЕННЫХ ТИПОВЫХ САР И ИХ АППРОКСИМАЦИЯ МАЛОПАРАМЕТРОВЫМИ МОДЕЛЯМИ

2018 ◽  
Vol 9 (4) ◽  
Author(s):  
В. А. Хобин ◽  
С. И. Лагерная
Keyword(s):  
Control System ◽  
Spectral Density ◽  
Automatic Control ◽  
Control Systems ◽  
Real Time ◽  
Automatic Control System ◽  
Control Object ◽  
Mathematical Expression ◽  
Computer Experiments ◽  
Automatic Control Systems

Two groups of the mathematical models, which describe changes in the regulated variables of closed automatic control systems as stochastic processes, are considered in the article. The first group is the informative models, obtained on the basis of analytical transformations that represent in the model of the process spectral density all the parameters of the object, regulator and perturbation effects models. The second group is well reflecting the nature of the spectral density formal models with a minimum number of parameters. This makes it possible to identify them in the real time, during the regular operation of the automatic control system. Comparison of models, including computer experiments based on simulation show the potential promise of their application for identifying the parameters of control object models in real time and without opening the control loop of automatic control systems.  In the article the mathematical description of the automatic control system is considered taking into account the features of the  technological type control objects, such as the presence of delay in the control channels, susceptibility to uncontrolled disturbances (intensive coordinate disturbances and parametric, low-frequency disturbances). A detailed considered the procedure for obtaining a mathematical expression for the informative models of the controlled variable spectral density for test typical variants of various system properties and perturbations combinations. The illustrations of the controlled variable of automatic control systems spectral density features are presented for various types of systems. There are also presented the possibility of replacing the informative controlled variable spectral density models with formal ones.

Investigation of the stability of periodic motions in a nonlinear automatic control system based on the fast fourier transform

2003 ◽  
Vol 3 ◽  
pp. 297-307
Author(s):  
V.V. Denisov
Keyword(s):  
Fourier Transform ◽  
Control System ◽  
Automatic Control ◽  
Fast Fourier Transform ◽  
Automatic Control System ◽  
Resonance Phenomenon ◽  
Periodic Motions ◽  
Multiply Connected ◽  
Non Linear ◽  
The Stability

An approach to the study of the stability of non-linear multiply connected systems of automatic control by means of a fast Fourier transform and the resonance phenomenon is considered.

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