Wyniki wyszukiwania - BazTech

1

High-speed infrared imaging for analysis of a diesel engine supplied with a premixed methane-air charge

Lagueux P., Tremblay P., Savary S., Farley V., Mancaruso E., Sequino L., Kastek M., Firmanty K.

Measurement Automation Monitoring

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2017

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Vol. 63, No. 2

60--64

EN

Efforts are continuously made for improving internal combustion engines (ICEs) efficiency. Lowering fuel consumption and reducing soot formation are among the challenges being addressed when seeking to improve engine designs. In this work, ICEs characterization was carried out on an elongated single-cylinder transparent diesel engine equipped with the multi-cylinder head of a commercial passenger’s car and a common rail injection system. The engine uses a conventionally extended piston where part of the piston’s crown is replaced by a sapphire window. In this configuration, a full view of the combustion bowl can be achieved while the engine is in operation by looking at a 45° fixed mirror located in the extended piston axis. Infrared imaging was carried out at 26 kHz, leading to a temporal resolution of about 0.35° crankshaft angle, at 1500 RPM, in the engine’s reference frame. The different phases of a combustion cycle, i.e. intake, compression, fuel injection, working stroke and exhaust, were investigated using four different spectral filters (broadband, CO2 red-spike, through-flame and hydrocarbons). In the experiment, air was replaced by a premixed air-methane charge in order to improve combustion and lower the amount of soot deposits. The results illustrate the potential of high-speed IR imaging as a diagnostic tool for ICEs.

2

Gas leaks detection using passive thermal infrared hyperspectral imaging

Lagueux P., Tremblay P., Morton V., Chamberland M., Farley V., Kastek M., Firmanty K.

Measurement Automation Monitoring

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2017

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Vol. 63, No. 2

65--68

EN

There are many types of natural gas fields including shale formations which are common especially in the St-Lawrence Valley (Canada). Since methane (CH4), the major component of shale gas, is odorless, colorless and highly flammable, in addition of being a greenhouse gas, methane emanations and/or leaks are important to consider for both safety and environmental reasons. On this regard, passive remote sensing represents an interesting approach since it allows characterization of large areas from a safe location. In order to illustrate the potential of passive thermal infrared hyperspectral imaging for research on natural gas, imaging was carried out on a shale gas leak that unexpectedly happened during a geological survey near Hospital Enfant-Jesus (Québec City, Canada) in December 2016. Quantitative methane imaging was carried out based on its unique infrared spectral signature. The results show how this novel technique could be used for advanced research on shale gases.

3

Analysis of combustion reaction based on infrared multispectral imaging

Huot A., Gagnon M. A., Lagueux P., Farley V., Chamberland M., Kastek M.

Measurement Automation Monitoring

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2015

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Vol. 61, No. 6

165--168

EN

Combustion analysis was carried out using Telops MS-IR MW camera which allows multispectral imaging at a high frame rate. A motorized filter wheel allowing synchronized acquisitions on eight (8) different channels was used to provide time-resolved multispectral imaging of combustion products of a candle in which black powder has been burnt to create a burst (carbon dioxide and water). It was then possible to estimate the temperature of the candle’s plume by modeling spectral profile derived from information obtained with the different spectral filters. Comparison with temperatures obtained using conventional broadband imaging illustrates the benefits of time-resolved multispectral imaging for the characterization of combustion processes.

4

Method and software for hyperspectral data analysis focused on automatic detection and identification of chemical agents

Kastek M., Piątkowski T., Chamberland M., Lagueux P.

Pomiary Automatyka Kontrola

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2013

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R. 59, nr 9

989--993

EN

This paper presents detection and identification of gases using an infrared imaging Fourier-transform spectrometer. The principle of operation of the spectrometer and the method for gases detection and identification is shown in the paper. The new software with implementation of method based on Clutter Match Filter, focused on detection and identification of gases is presented. Some results of the detection of various types of gases are also given.

PL

Wykrywanie zagrożeń we współczesnym świecie jest jednym z głównych zadań stawianych przed urządzeniami optoelektronicznymi. Skażenia chemiczne to jedne z wielu zagrożeń które są wykrywane za pomocą obserwacyjnych urządzeń podczerwieni. Jednym z zaawansowanych technologicznie urządzeń jest fourierowski spetroradiometr obrazowy wyposażony w matrycę 320x256 detektorów typu MCT (Mercury Cadmium Telluride). Konstrukcja spektroradiometru oparta na układzie interferometru Michelsona-Moreya umożliwia uzyskanie rozdzielczości spektralnej od 0.25 cm-1 do 150 cm-1 w zakresie od 830 cm-1 (12 μm) do 1290 cm-1 (7.75 μm) z częstotliwości rejestracji obrazów 0.2 Hz. Zasada działania spektroradiometru oraz jego parametry techniczne zostały przedstawione w pierwszej części artykułu natomiast dalsza część poświęcona jest metodzie analizy hyperspektralnych danych rejestrowanych za jego pomocą. Analiza danych oparta na dwóch zaawansowanych metoda filtracji bazujących na CMF (Clutter Match Filter) oraz bazie danych charakterystyk widmowych gazów umożliwia na automatyczną detekcję i identyfikację wybranych związków chemicznych. Metoda została przetestowana podczas badań laboratoryjnych, a pozytywne wyniki pozwoliły na implementację jej do komercyjnego oprogramowania. Uzyskane wyniki podczas testów przeprowadzonych w warunkach rzeczywistych (szczególnie podczas detekcji i identyfikacji związków chemicznych podczas swobodnego parowania) świadczą o dużej skuteczności opracowanej metody.