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Zaawansowane techniki InSAR w monitorowaniu osuwisk

Perski Zbigniew

Przegląd Geologiczny

2019

Vol. 67, nr 5

351--359

In recent years, there has been a rapid development of SAR acquisition techniques and all new satellite radar missions are equipped with SAR devices allowing beam steering. This paper presents results of experimental application of TerraSAR-X in ultra-high resolution SpotLight and Staring SpotLight modes for the area of the Just landslide in the Rożnow lake area. Another analyzed example was to use data of the medium resolution Sentinel-1 data acquired in the TOPS mode for the Huciska and Zapadle landslides in Szymbark. In this case, a network of 12 radar reflectors (corner reflectors) was installed to make the results independent of vegetation conditions on landslides. This study presents preliminary results of measurements and discusses the potential of applications and directions of further work.

Simulation of electrically controlled nematic liquid crystal Rochon prism

Buczkowska M., Derfel G.

Opto-Electronics Review

2016

Vol. 24, No. 3

103--107

Operation of an electrically controlled beam steering device based on Rochon prism made by use of nematic liquid crystal is modelled numerically. Deflection angles and angular distribution of light intensity in the deflected beam are calculated. Dynamics of the device is studied. Advantage of application of dual frequency nematic liquid crystal is demonstrated. Role of flexoelectric properties of the nematic is analyzed.

Influence of a helical pitch on orthoconic antiferroelectric liquid crystals performance

Bennis N., Dąrowski R., Rejmer W., Spadło A., Quintana X., Otón J. M.

Opto-Electronics Review

2011

Vol. 19, No. 1

71-75

Orthoconic antiferroelectric liquid crystals, whose half cone angle is 45°, are of interest in display technology because they are capable of providing greyscale in passively addressing waveform while exhibiting very good contrast. However, orthoconic antiferroelectrics having short pitch are difficult to be aligned, this makes surface stabilized alignment unfeasible. In this case, dynamic behaviour is usually poor, avoiding electronic addressing with standard electronics. In this work, we report the helical pitch measurements of OAFLC mixtures and we compare electrooptical performance of high and low pitch OAFLCs.