Wyniki wyszukiwania - BazTech

1

Konstrukcja i badania modułu fluorescencyjnego wieloparametrycznego klasyfikatora paliw ciekłych

Włodarski M., Kaliszewski M., Bombalska A., Mularczyk-Oliwa M., Młyńczak J., Kopczyński K.

Elektronika : konstrukcje, technologie, zastosowania

|

2013

|

Vol. 54, nr 9

52-53

PL

W prezentowanej pracy przedstawiono budowę i wstępne testy modułu fluorescencyjnego klasyfikatora paliw ciekłych. Element ten, w założeniach projektu, umożliwi rozbudowanie możliwości analitycznych opracowanego na Politechnice Warszawskiej wieloparametrycznego klasyfikatora paliw płynnych. W prezentowanym urządzeniu zastosowano wzbudzenie fluorescencji przy pomocy diody 280 i 375 nm. Sygnał - widma emisji - rejestrowany jest przy pomocy dwukanałowego spektrometru CCD. Do pomiaru fluorescencji paliw zastosowano przemysłowe światłowodowe próbniki odbiciowe.

EN

In presented paper the authors show construction and results of tests of fluorescence module of the liquid fuels classifier. The module is a part of multiparametric fuel classifier, developed by Warsaw University of Technology. Excitation of fluorescence is realised with use of two LED sources: 280 nm and 375 nm. Fluorescence signal is registered with use of dual channel CCD spectrometer. Two industry grade fiber optics fluorescence probes are used for direct fuel sampling.

2

Spectroscopic methods in application to oil pollution detection in the sea

Baszanowska E., Otremba Z.

Journal of KONES

|

2012

|

Vol. 19, No. 1

15-20

EN

The escalating maritime transport as well as offshore crude oil exploitation and pipeline transportation leads to the increase of feasibility of the discharge of petroleum substances to the sea environment events. Therefore, it is necessary to rapidly detect of oil pollution to minimize the extent of contamination in the seawater. The aim of this study is to discuss the assumptions of the optical methods using for detection of oil pollution in the seawater. We consider the different approaches of oil-in-water detection using spectral active and passive techniques with emphasis on fluorescence techniques. The intensive development of scientific apparatus and methods in light spectroscopy leads to build various airborne or underwater specialized devices (UV-, IR-scanners, fluorosensors), which allows to detect oil pollution in relatively large areas of the sea. The possibility of measurements of oil pollution in the seawater is particularly important for monitoring, especially in very difficult weather conditions and highly waved sea surface. Such possibilities should be given by devices for in-situ measurements based on time-resolved fluorescence. Such measurements allow obtaining the significant information about presence of oil in really short time. As we show in this study, the wide-range development of fluorescence techniques opens the diagnostic opportunity not only for detection of the oil-in-water content but also for identification the type of oil directly in seawater or even determination of the source of oil pollution.

3

Zastosowanie metod fluorymetrycznych w analizie paliw płynnych

Bombalska A., Kaliszewski M., Mularczyk-Oliwa M., Włodarski M., Kopczyński K.

Elektronika : konstrukcje, technologie, zastosowania

|

2012

|

Vol. 53, nr 9

60-63

PL

W pracy przedstawiono zastosowanie metod fluorymetrycznych do charakterystyki paliw płynnych. Paliwa z okresu zimowego scharakteryzowano metodami fluorescencji stacjonarnej oraz czasowo-rozdzielczej. Dodatek substancji uszlachetniających czy też podnoszących "odporność" paliw na niskie temperatury został zaobserwowany w charakterystykach wzbudzeniowo-emisyjnych tych paliw. Na podstawie charakterystyk wzbudzeniowo-emisyjnych wyodrębniono linię wzbudzenia 375 nm umożliwiającą rozróżnienie benzyn od olejów napędowych i bioestru. Nie udało się wybrać linii wzbudzenia rozróżniającej benzyny z grupy 95 i 98.

EN

In presented paper the authors show implementation of fluorescence methods for liquid fuels analysis. Winter fuels were characterized with the use of steady state fluorescence and time resolved fluorescence. The ad-didtion of refined substances or increasing immunity to low temperatures was registered on excitation-emmision maps (EEMs). Based on EEMs characteristics excitation line at 375 nm was chosen, as the one, that can distinguish diesel from petrol. No excitation line was establised for differen-tation of petrol 95 from 98.

4

Adoption of the time resolved fluorescence to oil type identification

Baszanowska E., Otremba Z., Rohde P., Zieliński O.

Journal of KONES

|

2011

|

Vol. 18, No. 2

25-29

EN

The present development of a basic science, including physics of stimulated emission of light, opens up new diagnostic possibilities in relation to the quality of oils, including marine fuels and lubricants. In complicated chemical composition of oils both light absorbing compounds and compounds that emit light (fluorescent) are included. This causes the formation of complex structures in the spectral plots of fluorescence intensity as a function of wavelength of light exciting fluorescence and as a function of the wavelength of light emitted. Since the fluorescence excitation occurs in a short time of its disappearance. The shape of the fluorescence decay function depends on the chemical composition of oil, therefore, includes a mention of its kind, quality, level of degradation, and the like. In this paper exemplary charts of the intensity decay curves in different parts of the fluorescence spectra are shown (for light fuel). Presented charts are obtained using the experimental device constructed in Bremerhaven University of Applied Sciences (Germany) and are the attempt to use ability of oil substance to manifest its composition in the form of the fluorescence decay curve. An analysis of the chart shows that decay of fluorescence in this case is described by biexponential curve, therefore a kind of oil can be represented by two numerical values - two decay time constants. Operational use of this method will be possible only after a comparative study of different types and quality of oil in relation to the shape of the fluorescence decay curves.

5

Zastosowanie metod spektroskopowych do analizy paliw płynnych

Kaliszewski M., Mularczyk-Oliwa M., Włodarski M., Bombalska A., Kopczyński K.

Elektronika : konstrukcje, technologie, zastosowania

|

2011

|

Vol. 52, nr 9

53-55

PL

W pracy przedstawiono możliwości klasyfikacji paliw płynnych za pomocą spektroskopii ptycznej. Paliwa analizowano za pomocą trzech technik. Spektroskopia FTIR umożliwiła rozróżnianie pomiędzy typami paliw oraz oznaczenie ich składu. Benzyny 95 i 98 pochodzące z rafinerii Orlen wyraźnie różnią się od swoich odpowiedników z innych wytwórni. Mapy wzbudzeniowo-emisyjne wykazały różnice pomiędzy typami paliw lecz nie umożliwiała rozróżniania pomiędzy Pb 95 i 98. Fluorescencja czasowo-rozdzielcza, przy wzbudzeniu promieniowaniem o długości fali 28O nm pozwoliła na wyraźne odróżnienie pomiędzy różnymi typami paliw.

EN

The manuscript presents application of optical spectroscopy for classification of liquid fuels. Three analytical techniques were used for analysis of fuels. FTIR spectroscopy allows determination of chemical composition and discrimination between different kinds of fuels. Biofuels, diesel, petrol 95 and 98 Orlen were grouped separately on the background of other Pb95 and Pb98. Excitation-emission maps of steady-state fluorescence showed differences between spectra. but petrol 95 and 98 were similar. Time-resolved fluorescence, with excitation wavelength at 280 nm allowed sharp discrimination between different kinds of fuels Chosen optical methods may allow identify and classify liquid fuels.

6

Enhancement of Photoacidity by Formation of an Intramolecular Charge Transfer State with Twisted Conformation

Szczepanik B., Obara R., Rothe A., Weigel W., Rettig W., Stachera M., Rotkiewicz K.

Polish Journal of Chemistry

|

2008

|

Vol. 82, nr 4

807-829

EN

The synthesis of a pair of biphenyls with a cyano acceptor and a hydroxy (methoxy) donor, which differ in the extent of steric hindrance to planarity, induced by ortho-methyl substituents with respect to the phenyl-phenyl bond is described. It is shown that dual fluorescence can be observed, ascribed to a mesomerically stabilized less polar intramolecular charge transfer (MICT) state of near planar geometry, and a more polar one, with strongly decoupled intramolecular CT resembling a TICT state. It possesses an enhanced dipole moment with respect to the MICT state, but considerably deviates from the perpendicular geometry as judged from the transition moments. This concept is used in conjunction with the excited-state proton transfer (ESPT) mechanism. The resulting photoacidity of the compound forming the enhanced ICT is an order of magnitude larger than for the MICT-compound. The mechanistic concept allows the construction of further compounds with still increased photoacidity.