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When heat transfer phenomena is modelled in the domain of electrical engineering, exact values of boundary conditions and material parameters are generally unknown and for the simulation are in many cases estimated. In this article is presented calculation of heat flux which was previously unknown in the task of modelling heat transfer through multi layer firefighter smart protective suit. Heat flux...
This paper presents a research focused on Aerosol Jet interconnecting of SMD components to flexible substrates. Flexible printed electronics is becoming important fast growing market segment. Contacting technologies of the electronic components are well known for traditional electronics such as soldering, welding, conductive adhesive bonding, however in the expansion of direct printing technologies...
This paper presents a research focused on Aerosol Jet printed pads adhesion improvement for electrically conductive adhesives (ECA) testing. The Aerosol Jet technology is able to use nanoparticle inks for deposition process. The adhesion of the ink to the substrate is crucial especially when you realize printing on flexible substrates. The paper will show a new method of adhesion improvement by plasma...
This paper presents a research focused on a comparison of two antennas made on a textile substrate by two different technologies and optimized for Ultra-Wideband (UWB) communication. The first used technology was embroidering and the second one was screen-printing. The objective of the research was to achieve a flexible and washable antenna which would be possible to integrate into clothes without...
This paper presents a research focused on comparison of two types of textile electrodes for continuous measurement of electrocardiogram (ECG) signals. We designed and realized knitted and embroidered textile electrodes, which were integrated in a sport top, chest strap and a functional T-shirt respectively. The integration of the electrodes was done in close cooperation of two SME textile companies...
A fast and efficient algorithm is presented allowing a firefighter dressed in a smart firefighter protective suit continuously informing him about the time that he can still safely spend in a burning bulding, which is characterized by an dynamic environment of time-variable temperature. The algorithm starts from precalculated time evolution of temperature at selected places of the overall (mostly...
This paper presents a research focused on four-wire resistivity measurement of the selected materials printed by Aerosol Jet Printing system (AJP) with different process parameters. The aerosol jet printing technology is an additive deposition technique which is based on the idea of the formation the aerosol mist from the printed ink and its transportation on the substrate by gas flow. The aerosol...
This paper presents a research focused on a comparison of the quality and electrical parameters of the interdigital electrodes prepared by aerosol jet printing (AJP) technique and conventional lift-off technique. The Interdigital electrodes (IDE) belong among the most commonly used periodic electrode structures for a wide variety of sensors and transducers. The IDE testing sample were designed with...
This paper presents a research focused on embroidered temperature and humidity sensor elements for smart textile applications in health and medical care. Smart textile products face desirable textile properties for health care use include durability, “launderability” (washing resistance), flexibility and non-toxicity and the comfort aspect of clothing is also very important. For these reasons, the...
This paper presents a research focused on development of low-cost manufacturing process which enables fabrication of accurate organic humidity sensors, where only screen printing is used for all layers deposition. It means that not only the interdigital structures with 50 µm line and space, but also phatolocynine sensing film and protective polymer layer are screen printed. The interdigital structures...
In this paper a new prediction tool is presented, which can provide both yield and defect level predictions. The tool, which is based on DPMO (defects per million opportunities) metric, is intended for newly designed printed circuit board assemblies. It is programmed in Visual Basic for Application (VBA) and it can be operated in MS Excel environment. Yield prediction is based on so called the yield-DPMO...
In this paper a methodology for optimization of false call rate in automated optical inspection post reflow is presented. The Automated optical inspection (AOI) of assembled PCB's is one of the most widely spread non-destructive testing method. It helps to ensure that defects created while the printed circuit board assembly is being manufactured are discovered before the product is shipped to final...
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