Fogging effect compensation technique for photomask making

2000 ◽  
Author(s):  
Yuji Nozaki ◽  
Toshiyuki Tanaka ◽  
Katsuhiro Takushima ◽  
Seki Suzuki ◽  
Akihiro Endo ◽  
...  
Keyword(s):  
Compensation Technique ◽  
Fogging Effect

Influence of the Aperture Edge Diffraction Effects on the Mutual Coupling Compensation Technique in Small Planar Antenna Arrays

2011 ◽  
Vol 57 (1) ◽  
pp. 115-120 ◽  
Author(s):  
Mariusz Zamłyński ◽  
Piotr Słobodzian
Keyword(s):  
Antenna Arrays ◽  
Mutual Coupling ◽  
Planar Antenna ◽  
Sidelobe Level ◽  
Edge Diffraction ◽  
Narrow Angle ◽  
Compensation Technique ◽  
Diffraction Effects ◽  
Linear Antenna Arrays

Influence of the Aperture Edge Diffraction Effects on the Mutual Coupling Compensation Technique in Small Planar Antenna Arrays In this paper the quality of a technique to compensate for mutual coupling (and other phenomena) in small linear antenna arrays is investigated. The technique consists in calculation of a coupling matrix, which is than used to determine corrected antenna array excitation coefficients. Although the technique is known for more than 20 years, there is still very little information about how different phenomena existing in a real antenna arrays influence its performance. In this paper two models of antenna arrays are used. In the first model the effect of mutual coupling is separated from the aperture edge diffraction. In the second model antenna both mutual coupling and aperture edge diffraction effects are included. It is shown that mutual coupling itself can be compensated very well and an ultralow sidelobe level (i.e. -50 dB) could be achieved in practice. In the presence of diffraction effects -46.3 dB sidelobe level has been attained, but radiation pattern can be controled only in narrow angle range (i.e. up to ±60°).

An instrument for the measurement of colour and turbidity in natural waters

1998 ◽  
Vol 37 (12) ◽  
pp. 263-267 ◽  
Author(s):  
Henry O. Edwards
Keyword(s):  
Water Treatment ◽  
Natural Waters ◽  
Beam Intensity ◽  
Compensation Technique

The development of a sensor to measure colour and turbidity of natural waters is described. Filtration of the water is not required, so maintenance intervals and costs will be reduced. A four-beam intensity compensation technique is used for robust measurement and resistance to fouling. Results of the operation of a prototype at a water treatment works are presented.

Recent Progress on Nonlinear Compensation Technique in Digital Coherent Receiver

2010 ◽  
Author(s):  
Takeshi Hoshida ◽  
Takahito Tanimura ◽  
Shoichiro Oda ◽  
Toshiki Tanaka ◽  
Hisao Nakashima ◽  
...  
Keyword(s):  
Recent Progress ◽  
Compensation Technique ◽  
Nonlinear Compensation ◽  
Coherent Receiver

A Phase Compensation Technique of Sampling Moiré Method for Accurate Single-Shot Phase Analysis

2011 ◽  
Vol 70 ◽  
pp. 243-248
Author(s):  
Shien Ri ◽  
Takashi Muramatsu ◽  
Masumi Saka
Keyword(s):  
Computer Simulation ◽  
Phase Analysis ◽  
Phase Error ◽  
Linear Interpolation ◽  
Small Displacement ◽  
Single Shot ◽  
Phase Compensation ◽  
Compensation Technique ◽  
Moire Method ◽  
Effective Phase

Recently, a technique for fast and accurate phase analysis called sampling moiré method has been developed for measurement of small-displacement distribution. In this study, a distribution of phase error caused by linear interpolation in case with mismatch between the sampling pitch and the grating pitch is theoretically analyzed. Moreover, a technique for effective phase compensation is proposed to reduce the periodic phase error. The performance of our compensation method is validated by a computer simulation. Phase analysis can be performed more accurately even in the case that the sampling pitch does not match to the grating pitch strictly.

Compensation Technique for Active Damping Improvement

1965 ◽  
Vol 38 (3) ◽  
pp. 481-482 ◽  
Author(s):  
J. M. Lawther ◽  
T. H. Rockwell
Keyword(s):  
Active Damping ◽  
Compensation Technique
Sign in / Sign up

Export Citation Format

Share Document