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1

Highly sensitive airborne open path optical hygrometer for upper air measurements – proof of concept

Stacewicz T., Magryta P., Petersen B., Nowak J. L., Kwiatkowski K., Malinowski S. P.

Metrology and Measurement Systems

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2018

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Vol. 25, nr 4

793--805

EN

A concept of a highly sensitive and fast-response airborne optoelectronic hygrometer, based on the absorption spectroscopy with laser light tuned to an intense ro-vibronic absorption line of H2O in the 1391–1393 nm range is presented. The target application of this study is airborne atmospheric measurements, in particular at the top of troposphere and in stratosphere. The cavity ring-down spectroscopy was used to achieve high sensitivity. In order to avoid interference of the results by water desorbed from the instrument walls, the open-path solution was applied. Tests of the instrument, performed in a climatic chamber, have shown some advantages of this concept over typical hygrometers designed for similar applications.

2

Projekt optoelektronicznego systemu do wykrywania biomarkerów w oddechu

Stacewicz T., Wojtas J., Mikołajczyk J., Bielecki Z.

Przegląd Elektrotechniczny

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2013

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R. 89, nr 10

139-141

PL

W artykule przedstawiono opis projektu systemu, który będzie umożliwiał wczesną diagnozę chorób na podstawie analizy oddechu człowieka. W ramach podjętych prac opracowany zostanie demonstrator optoelektronicznych sensorów do wykrywania lotnych markerów chorobowych. Będą w nim zastosowane wysokoczułe techniki spektroskopii laserowej takie jak spektroskopia w komórkach wieloprzejściowych (SWP) oraz spektroskopia strat we wnęce optycznej (SSWO). Zaproponowane metody detekcji mogą być zastosowane w diagnostyce medycznej, nawet w screeningu chorób, do oceny skuteczności leczenia, do monitorowania gazów egzogennych (emisji bakteryjnych lub trucizn) i w analizie gazów metabolicznych, we wczesnym wykrywaniu wznowy (ponowny wzrost stężenia cząstek), do późnego wykrywania wznowy - nawrotu choroby, lub do analizy skuteczności leków.

EN

Optoelectronic system designed to biomarkers detection - the paper presents a design of the system, which provides early diagnosis of diseases based on the analysis of human breath. The goal of the undertaken work is to develope the optoelectronic system for the detection of volatile disease markers. In this design, there are used highly sensitive laser spectroscopy techniques such as multipass spectroscopy and cavity ring-down spectroscopy. The proposed detection method can be used in medical diagnosis, even in the diseases screening, to evaluate the effectiveness of treatment, to the exogenous gases monitoring (bacterial emissions or toxins), to analyze metabolic gases, to detect disease recurrence (re-increase in the concentration of particles), and to analyze the medicines efficacy.

3

Ultrasensitive laser spectroscopy for breath analysis

Wojtas J., Bielecki Z., Stacewicz T., Mikołajczyk J., Nowakowski M.

Opto-Electronics Review

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2012

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Vol. 20, No. 1

26-39

EN

At present there are many reasons for seeking new methods and technologies that aim to develop new and more perfect sensors for different chemical compounds. However, the main reasons are safety ensuring and health care. In the paper, recent advances in the human breath analysis by the use of different techniques are presented. We have selected non-invasive ones ensuring detection of pathogenic changes at a molecular level. The presence of certain molecules in the human breath is used as an indicator of a specific disease. Thus, the analysis of the human breath is very useful for health monitoring. We have shown some examples of diseases' biomarkers and various methods capable of detecting them. Described methods have been divided into non-optical and optical methods. The former ones are the following: gas chromatography, flame ionization detection, mass spectrometry, ion mobility spectrometry, proton transfer reaction mass spectrometry, selected ion flow tube mass spectrometry. In recent twenty years, the optical methods have become more popular, especially the laser techniques. They have a great potential for detection and monitoring of the components in the gas phase. These methods are characterized by high sensitivity and good selectivity. The spectroscopic sensors provide the opportunity to detect specific gases and to measure their concentration either in a sampling place or a remote one. Multipass spectroscopy, cavity ring-down spectroscopy, and photo-acoustic spectroscopy were characterised in the paper as well.

4

Spektroskopia strat we wnęce optycznej

Bulska E., Ruszczyńska A., Stacewicz T., Snopczyński T.

Analityka : nauka i praktyka

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2009

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nr 3

4-8

5

Optoelektroniczny czujnik gazu wykorzystujący metodę CEAS

Bielecki Z., Nowakowski M., Wojtas J., Stacewicz T., Czyżewski A.

Elektronika : konstrukcje, technologie, zastosowania

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2006

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Vol. 47, nr 11

65-67

PL

W artykule podano klasyfikację metod detekcji gazów, opisano metodę CRDS (ang. Cavity Ring-Down Spectroscopy) oraz eksperyment polegający na zastosowaniu metody CEAS (ang. Cavity Enhanced Absorption Spectroscopy) do wykrywania śladowych stężeń dwutlenku azotu (NO2). W badaniach stosowano półprzewodnikowy niebieski laser impulsowy firmy TopGan. Koncentrację NO2 określano na podstawie czasu zaniku natężenia promieniowania magazynowanego w optycznej wnęce rezonansowej. Uzyskano czułość detekcji poniżej 1ppb.

EN

We present an experiment with nitrogen dioxide (NO2) detection with the use of cavity enhanced spectroscopy (CEAS). The pulsed blue diode laser (TopGan) working at 414 nm as a light source was applied. The resonant cavity was composed of two mirrrors with the high reflectivity. The off-axis adjustment of the resonator was used. The absorbing gas concentration was determined by the measurement of the decay time of the light pulse trapped in the optical resonant cavity. The detection limit better than 1 ppb was obtained.