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Design and investigation on wideband antenna based on polydimethylsiloxane (PDMS) for medical imaging application

Li Nga Yan, Zakaria Zahriladha, Shairi Noor Azwan, Alsariera Hussein, Alahnomi Rammah

Przegląd Elektrotechniczny

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2020

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R. 96, nr 3

89--92

EN

This paper presents an antenna for the medical imaging application which can detect unusual tissues on any part of the body. A compact design of wideband antenna with wearable properties is proposed for the medical imaging application. The wideband antenna is designed with introducing notches to the patch and a t-shaped slot at the partial ground. Polydimethylsiloxane (PDMS) is introduced to the antenna for the implementation of the wearable antenna. The proposed antenna operated in a frequency range of 3GHz to 6GHz. The antenna that embedded with PDMS shows a good agreement to the antenna without PDMS. An experimental proposed structure shows a good agreement with the simulated results. The overall dimension of the antenna is 24mm(W) x 38mm( L) which consider is a miniature antenna. This proposed design give an alternative solution for the antenna which cannot be wear on the body and protect the antenna. The introduction of PDMS will reduce the signal reflection cause by the high coupling of the human body.

PL

W artykule opisano antenę umożliwiającą wykrywanie zmian w tkance w ciele człowieka. Antena została zaprojektowana do celw obrazowania medycznego. Antena pracuje w zakresie częstotliwości 3 – 6 GHz. Rozmiary anteny wynoszą 24 x 38 mm. Konstrukcja anteny umożlwia ciągła pracę w różnych warunkach i wykorzystuje polydimethylsiloxane PDMS.

2

Micro-bending sensor made from polydimethylsiloxane

Novak Martin, Jargus Jan, Nedoma Jan, Vasinek Vladimir, Martinek Radek, Stolarik Martin

Przegląd Elektrotechniczny

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2019

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R. 95, nr 6

4--8

EN

The article describes the process of manufacturing micro-bending sensors from polydimethylsiloxane and the checking of their function on the basis of damping behaviour. We tested three manufactured alternatives and from the results we determined coefficients for the calculation of the mass of weight on the assumption that the level of damping is known. We also tested the micro-bending sensors in practice as a walking detector, we can imagine similar uses for the sensor because it is compact, reliable, simple to produce, resistant to unfavorable conditions and cheap.

PL

W artykule opisano konstrukcję czujnika ugięcia wykonanego z polydimethylsiloxanu. Zbadano trzy alternatywne konstrukcje i określono masę obliczeniowoą przy założeniu że poziom tłumienia jest znany. Zbadano też praktyczne zastosowanie czujnika jako detektora kroków.

3

Light Conversion and Scattering in UV Protective Textiles

Grancarić A.M., Tarbuk A., Botteri L.

Autex Research Journal

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2014

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Vol. 14, no. 4

247--258

EN

The primary cause of skin cancer is believed to be a long exposure to solar ultraviolet radiation (UV-R) crossed with the amount of skin pigmentation in the population. It is believed that in childhood and adolescence 80% of UV-R gets absorbed, whilst in the remaining 20% gets absorbed later in the lifetime. This suggests that proper and early photoprotection may reduce the risk of subsequent occurrence of skin cancer. Textile and clothing are the most suitable interface between environment and human body. It can show UV protection, but in most cases it does not provide full sun screening properties. UV protection ability highly depends on large number of factors such as type of fibre, fabric surface and construction, type and concentration of dyestuff, fluorescent whitening agent (FWA), UV-B protective agents, as well as nanoparticles, if applied. Based on electronically excited state by energy of UV-R (usually 340-370 nm), the molecules of FWAs show the phenomenon of fluorescence giving to white textiles high whiteness of outstanding brightness by reemitting the energy at the blue region (typically 420-470 nm) of the spectrum. By absorbing UV-A radiation, optical brightened fabrics transform this radiation into blue fluorescence, which leads to better UV protection. Natural zeolites are rock-forming, microporous silicate minerals. Applied as nanoparticles to textile surface, it scatters the UV-R resulting in lower UV-A and UV-B transmission. If applied with other UV absorbing agents, e.g. FWAs, synergistic effect occurs. Silicones are inert, synthetic compounds with a variety of forms and uses. It provides a unique soft touch, is very resistant to washing and improves the property of fabric to protect against UV radiation. Therefore, the UV protective properties of cotton fabric achieved by light conversion and scattering was researched in this paper. For that purpose, the stilbene-derived FWAs were applied on cotton fabric in wide concentration range without/with the addition of natural zeolite or silicone- polydimethylsiloxane. UV protection was determined in vitro through ultraviolet protection factor. Additionally, the influence to fabric whiteness and hand was researched.

4

Microfluidic preconcentrator and microfluidic chip for bacterial cells detection

Szczypiński R., Grzelka J., Baraniecka A., Górska M., Lesiński J., Łysko J., Grodecki R., Pijanowska D. G., Grabiec P.

Optica Applicata

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2011

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Vol. 41, nr 2

395--401

EN

Flow cytometry is a very popular clinical diagnostic method for a fast analysis of different kinds of cells/microparticles. In classic cytometers fluorescence, labeled cells are hydrodynamically focused in flow stream to order them and direct individually to a detection area with an optical detector. After laser excitation, the fluorescence emission light is directed into a light sensitive window of an optical detector (photomultiplier). Output signals of the detector may be counted in the digital or analog form (integration). In the experimental system, the photomultiplier was used as the integrator, so its output voltage was proportional to the number of fluorescence labeled cells. To miniaturize the flow cytometer, own technology for fabrication of microfluidic structure as a pre-concentrator with utilization of SU-8 masters was used.