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Optimisation of a rectangular-profile diffraction grating

100%

Janucki J.

tom Vol. 42, no 2

275-281

Analysis of properties of a diffraction grating used as a power splitter of laser radiation has been presented. Results of numerical calculations of diffraction grating characteristics as a function of their geometrical parameters, wavelength of radiation and incidence angle of the laser beam have been shown. Conclusions concerning the designs of radiation sputters have been formulated.

Zastosowanie spektroskopii plazmy wzbudzanej laserowo do zdalnego wykrywania materiałów wybuchowych

63%

Janucki J. , Kiczyński K.

tom R. 87, nr 10

106-109

W pracy przedstawiono wyniki badań wpływu parametrów lasera wzbudzającego, układu detekcji i procedury analizy widma promieniowania plazmy oraz właściwości atmosfery i podłoża na możliwości detekcji cząsteczek materiału wybuchowego metodą spektroskopii plazmy wzbudzanej laserowo. Do analizy danych zastosowano oryginalną metodę cyfrowego przetwarzania sygnałów spektralnych wykorzystującą transformatę falkową i nadzorowany algorytm ekstrakcji informacji użytecznej do identyfikacji materiałów pochodzenia organicznego.

The work presents the results of research into the influence of the spectral data processing and characteristics of substrate materials and environment parameters on the effectiveness of trace explosive detection with stand-off laser induced plasma spectroscopy. A novel method of data analysis has been developed and applied to spectral signal processing. The method makes use of the algorithm of stationary wavelet transform and supervised principal component analysis.

Solution of a problem of diffraction from a plane grating at normal wave incidence

63%

Janucki J. , Owsik J.

tom Vol. 42, no 3

373-378

Periodic structures have been used in many applications of laser technology and radio engineering. They replace the transducers of radiation parameters. The methods employed for calculation of their electrodynamic properties are well known from the literature. However, complicated numerical computations are required to solve the diffraction equations in theirs general form. The paper presents the method of calculation of electrodynamical properties of a plane periodic structure for the particular case of normal wave falling. The used transformations allow to reduce the time of numerical calculations.

Mathematical modelling of a reproduction process of the average power unit of laser radiation and transfer of its value

38%

Owsik J. , Janucki J. , Libermann A. A. , Kotyuk A. F. , Kovalev A. A. , Moskaluk S. A.

Journal of Technical Physics

2007

tom Vol. 48, no 2

67-76

Mathematical model of a reproduction process of average radiation power of laser and of its value transfer has been developed. Also, an algorithm for correction of the result of this process, improving metrological properties of a standard, has been formulated. The paper presents the results of theoretical tests proving correctness of the assumptions used in the model.

Portable low uncertainty calorimetric standard for energy unit of pulse laser radiation

38%

Skrzeczanowski W. , Owsik J. , Długaszek A. , Janucki J. , Nowakowski M. , Zarwalska A.

tom Vol. 42, no 4

475-483

New instrument for metrology applications in measurements of laser pulse energy is presented. Due to its parameters it can be used as a standard for unit of energy of pulse laser radiation. The instrument consists of a control unit, three different sources of laser radiation, two receivers of optical signal, and a laptop. The whole system can be easily transported enabling one to carry out measurements in situ, at customers, not only in laboratory conditions. A method of measurement used in operation of the standard is described. Main characteristics of the standard are shown. Methods of calculation of uncertainties of measurement during laser energy meters calibration by means of our standard are also presented.