Stanisław Lipiński

Military University of Technology in Warsaw

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Tomasz Nasiłowski

Atotech (United States)

Tomasz Stańczyk

Kielce University of Technology

K. I. Wysokiński

Maria Curie-Skłodowska University

T. Durejko

Military University of Technology in Warsaw

Marek Napierała

Atotech (United States)

T. Tenderenda

Maksymilian Pluta Institute of Applied Optics

Tomasz Czujko

Military University of Technology in Warsaw

Janusz D. Fidelus

Central Office of Measures

MŁ

Magdalena Łazińska

Military University of Technology in Warsaw

M. Murawski

University College London

Cooperative Institutions

Military University of Technology in Warsaw

Warsaw University of Technology

Maksymilian Pluta Institute of Applied Optics

Maria Curie-Skłodowska University

Instytut Chemii i Techniki Jądrowej

Institute of Physics

École Polytechnique Fédérale de Lausanne

Polish Academy of Sciences

Atotech (United States)

University of Waterloo

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Simultaneous remote measurement of CO2 concentration, humidity and temperature with a matrix of optical fiber sensors

K. I. Wysokiński Marta Filipowicz Tomasz Stańczyk Stanisław Lipiński Marek Napierała

A matrix of optical fiber sensors eligible for remote measurements is reported in this paper. The aim of work was to monitor the air quality with a device, which does not need any electricity on site of the measurement. The matrix consists of several sensors detecting carbon dioxide concentration, relative humidity and temperature. Sensors utilize active optical materials, which change their color when exposed to varied conditions. All the sensors are powered with standard light emitting diodes. Light is transmitted by an optical fiber from the light source and then it reaches the active layer which changes its color, when the conditions change. This results in a change of attenuation of light passing through the active layer. Modified light is then transmitted by another optical fiber to the detector, where simple photoresistor is used. It is powered by a stabilized DC power supply and the current is measured. Since no expensive elements are needed to manufacture such a matrix of sensors, its price may be competitive to the price of the devices already available on the market, while the matrix also exhibits other valuable properties.

Optical power

Photoresistor

Active layer

Matrix (chemical analysis)

10.1117/12.2278293

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The Tribaloy T-800 Coatings Deposited by Laser Engineered Net Shaping (LENSTM)

Materials (2019)

T. Durejko Magdalena Łazińska Julita Dworecka-Wójcik Stanisław Lipiński Robert A. Varin

A Tribaloy family of alloys (CoMoCrSi) are characterized by a substantial resistance to wear and corrosion within a wide range of temperatures. These properties are a direct result of their microstructure including the presence of Laves phase in varying proportions. Tribaloy T-800 exhibits the highest content of Laves phase of all other commercial Tribaloy alloys, which provides high hardness and wear resistance. On the other hand, a large content of the Laves phase brings about a high sensitivity to brittle fracture of this alloy. The main objective of this work was a development of the Tribaloy T-800 coatings on the Ni-based superalloy substrate (RENE 77), which employs a Laser Engineered Net Shaping (LENSTM) technique. Technological limitations in this process are susceptibility of T-800 to brittle fracture as well as significant thermal stresses due to rapid cooling, which is an inherent attribute of laser techniques. Therefore, in this work, a number of steps that optimized the LENSTM process and improved the metallurgical soundness of coatings are presented. Employing volume and local substrate pre-heating resulted in the formation of high quality coatings devoid of cracks and flaws.

Laves phase

Brittleness

Near net shape

10.3390/ma12091366

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Citations (24)

Study on the Sensing Coating of the Optical Fibre CO2 Sensor

Sensors (2015)

K. I. Wysokiński Marek Napierała Tomasz Stańczyk Stanisław Lipiński Tomasz Nasiłowski

Optical fibre carbon dioxide (CO₂) sensors are reported in this article. The principle of operation of the sensors relies on the absorption of light transmitted through the fibre by a silica gel coating containing active dyes, including methyl red, thymol blue and phenol red. Stability of the sensor has been investigated for the first time for an absorption based CO₂ optical fiber sensor. Influence of the silica gel coating thickness on the sensitivity and response time has also been studied. The impact of temperature and humidity on the sensor performance has been examined too. Response times of reported sensors are very short and reach 2-3 s, whereas the sensitivity of the sensor ranges from 3 to 10 for different coating thicknesses. Reported parameters make the sensor suitable for indoor and industrial use.

Carbon dioxide sensor

Response time

10.3390/s151229890

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Citations (30)

Mikrostruktura i wybrane właściwości mechaniczne spiekanych materiałów gradientowych Fe-Al

Kompozyty (2010)

Stanisław Lipiński T. Durejko

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Passive fiber optic temperature sensor for safety applications

Agnieszka Kołakowska K. I. Wysokiński Janusz D. Fidelus Stanisław Lipiński Małgorzata Kuklińska

Fiber optic sensors (FOS) are insensitive to external EM fields and are intrinsically safe (as no electrical power is needed at the sensing point), so the measurement can be performed in areas where standard electronic devices cannot easily be applied. What is more, due to the very low silica fiber attenuation the measurement point can be located kilometers away from a light source and detector, which makes the sensors independent of a local power source. Furthermore the FOS are small so they can be used for sensing in mechanical mechanisms where there is not much free space. They can also be easily integrated with the structure of different materials for military applications (e.g. in tanks and airplanes). In this work we propose an intrinsically safe temperature sensor based on fiber optic technology. The presented sensor is entirely passive and benefits from all of the advantages mentioned above, which allows it to be applied in the most demanding environments. The construction of the presented sensor is based on a dedicated microstructured optical fiber which allows both the range and sensitivity of the sensor to be adjusted to a specific application.

10.1117/12.2278508

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Porous graded FeAl intermetallic foams fabricated by sintering process using NaCl space holders

Materials Science and Engineering A (2015)

Magdalena Łazińska T. Durejko Stanisław Lipiński Wojciech Polkowski Tomasz Czujko

FEAL

10.1016/j.msea.2015.02.053

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Citations (56)

Precise interferometric system for fast contactless measurements of lens thickness

Michalina Jóźwik M. Szymański Stanisław Lipiński Tomasz Stańczyk Daniel Kunicki

In the process of the lens production it is extremely important that a total time of measuring the lens thickness, taking into account also the time needed to insert the lens into a system, should be short enough to test the substantial part of the series of products. Currently used methods of measuring lens thickness apply various solutions [1, 2], but none of them offers a fast and cost effective system which is capable to perform contactless measurement combined with high accuracy. For optical reflection measurements (e.g. employing the Michelson interferometer), which are the most common, the lens alignment must be very precise, so it takes a lot of time (even a few minutes, which depends on the lens parameters, such as radius of curvature) to perform measurement of a single lens.

Radius of curvature

Reflection

10.1109/cleoe-eqec.2017.8086902

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Structure and properties of the Fe3Al-type intermetallic alloy fabricated by laser engineered net shaping (LENS)

Materials Science and Engineering A (2015)

T. Durejko Michał Ziętala Magdalena Łazińska Stanisław Lipiński Wojciech Polkowski

Equiaxed crystals

10.1016/j.msea.2015.10.076

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Citations (51)

Temperature and mechanical reliability of electrolytic fiber to metal joints for applications in fiber optic sensor

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2014)

Tomasz Stańczyk K. I. Wysokiński T. Tenderenda Stanisław Lipiński Ł. Ostrowski

In this work we present an innovative method of connecting metal coated optical fibers with metal surfaces. The process is based on electrolytic reaction between copper and allows to obtain a robustand inflexible connection. Furthermore reliability tests of such fiber to metal joints have been performed, with the results of mechanical strength and temperature resistance tests presented. Additionally, as accelerated oxidation of copper at elevated temperatures is a major concern in long term temperature stability of the connection, we propose a method of slowing down the oxidation process with chemical nickel coating. Analysis of the obtained results allows us to predict that the investigated connection may find applications in various industrial optical sensors with special focus on harsh environments.

10.1117/12.2059608

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Citations (3)

The influence of CO₂gas sensor parameters on its operation characteristic

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2015)

K. I. Wysokiński Marek Napierała Tomasz Stańczyk Stanisław Lipiński Tomasz Nasiłowski

Optical fiber carbon dioxide gas sensors are reported. The sensors utilize pH sensitive indicator dyes, which change color, when exposed to varied concentrations of CO₂. Sensors were made by deposition of silica sol solution on the Plastic Clad Silica fiber side surface. The possibility of preparing the sensors by deposition of active layer on the surface of etched fibers has also been demonstrated. Dependence between the fiber diameter and the sensitivity of the sensor has been presented. Morphology of the active layer has been investigated by the analysis of SEM images.

Deposition

Carbon dioxide sensor

Active layer

Silica fiber

10.1117/12.2228822

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Citations (1)