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Polarimetric sensor for weigh-in motion of road vehicles

100%

Wierzba P. , Kosmowski B. B.

2000

tom Vol. 8, No. 2

181-187

Weigh-in-motion (WIM) of road vehicles is a technology used in many applications, ranging from research to law enforcement. Sensors for WIM systems should exhibit high dynamic range, good accuracy and repeatability, as well as long service life. One of the most promising group of sensors for this application are polarimetric sensors, due to their simplicity and high sensitivity. Their viability for this application has been successfully demonstrated. Preliminary tests shown however, that the construction of the sensors should be modified to eliminate hysteresis and sensor's nonlinearity.

Optyczna tomografia niskokoherentna w badaniach obiektów technicznych

80%

Pluciński J. , Strąkowski M. , Kosmowski B. B.

tom Vol. 48, nr 9

37-38

Przedstawiono możliwości optycznej tomografii niskokoherentnej (OCT) w badaniach obiektów technicznych. Zwrócono uwagę, że wymagania wobec tej metody są inne niż w systemach przeznaczonych do badań obiektów biologicznych w diagnostyce medycznej. Zaproponowano polaryzacyjny system OCT, pracujący w dziedzinie czasu z detekcją zrównoważoną, w którym źródłem promieniowania niskokoherentnego była dioda superelektroluminescencyjna lub femtosekundowy erbowy laser światłowodowy, podłączony do światłowodu fofonicznego generujący "superkontinuum". Pokazano przykładowe wyniki pomiarów obiektów technicznych, jakim były warstwy ceramiczne PLZT na szkle borokrzemowym.

The capabilities of optical coherent tomography (OCT) for investigation of technical objects are presented. Authors have noticed that the requirements towards this method in examinations of technical objects are different than in examinations of biological objects to medical diagnosis. A dedicated (OCT) system for technical material investigation has been developed. This system is based on time-domain polarization-sensitive analyzes with balanced detection. Superluminescence diode or a femtosecond erbium-doped fiber laser connected to a photonic crystal fiber producing "super-continuum" are used as wideband light sources. Measurement results of PLZT ceramic layer deposited on borosilicate glass are presented as an example of application of our system to investigation of technical objects.

Raman investigation of hybrid polymer thin films

80%

Gnyba M. , Keranen M. , Kozanecki M. , Kosmowski B. B.

tom Vol. 23, No. 1

29--39

Raman spectroscopic studies were carried out for hybrid polymer thin films prepared for photonic applications by the sol-gel technology. Our aims were to analyse the ability of the Raman method toestimate the efficiency of the main reactions of the sol-gel process and to provide information about the chemical composition of the films as well as their thickness, profile, and quality. The difficulties in measurement such as low level of Raman signals, difficulties in data analysis caused by the complex structure of the materials, and the influence of interfering signals, are discussed. The application of Raman microscopy for characterising films based on 3-glycidoxypropyl-trimethoxysilane (GPTS), methacryloxypropyltrimethoxysilane (MPTS), and 3-aminopropyl-trimethoxysilane (APTES) is presented. The efficiencies of reactions of inorganic and organic polymerisation were measured and their products have been identified. The influence of the excitation beam wavelength as well as the type of substrate on the Raman spectra was investigated. Moreover, two-dimensional Raman mapping enabled us to record the thickness profiles of the deposited structures and to detect their defects.

Optical low-coherence interferometry for selected technical applications

61%

Pluciński J. , Hypszer R. , Wierzba P. , Strąkowski M. , Jędrzejewska-Szczerska M. , Maciejewski M. , Kosmowski B. B.

nr 2