Janusz Smulko - Publications - Bridge of Knowledge

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Year 2006
Year 2003
Year 2008
Year 2019
  • Methods of trend removal in electrochemical noise data – overview
    Publication

    In this paper we shall review popular methods of trend removal from electrochemical noise time records. The basic principles of operation of the six most popular methods are explained. The proposed methods are: high - pass filtering, Moving Average Removal, polynomial detrending, wavelet detrending, Empirical Mode Decomposition and Variational Mode Decomposition. Estimation of trend removal quality...

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  • Noise in electrical double-layer capacitors (EDLCs)
    Publication

    We present methods and problems of noise measurements in electrical double-layer capacitors (EDLC). Detailed noise equivalent electronic circuit is considered, and two possible ways of observations of random processes generated in the EDLCs structures are studied. We conclude that noise is a useful tool for characterization of the EDLC structures and their state-of-health, as in other materials and electronic devices. Eventual,...

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Year 2002
Year 2013
  • Metody usuwania zakłóceń podczas pomiarów polowych widm Ramana
    Publication

    W pracy zostały scharakteryzowane źródła zakłóceń występujące podczas pomiarów widm Ramana w warunkach polowych. Zaprezentowano wpływ czasu integracji na jakość rejestrowanych widm w przypadkach, gdy szumy własne spektrometru mają składową typu 1/f, dominującą w zakresie małych częstotliwości. Przedstawiono także wyniki uzyskane podczas pomiarów z detekcją synchroniczną, stosowaną w przenośnych spektrometrach Ramana, w pomiarach...

  • Metody usuwania zakłóceń podczas pomiarów polowych widm Ramana

    W pracy zostały scharakteryzowane źródła zakłóceń występujące podczas pomiarów widm Ramana w warunkach polowych oraz sposoby redukcji ich wpływu na jakość rejestrowanych widm. Zaprezentowano wpływ czasu integracji na jakość rejestrowanych widm w przypadkach, gdy szumy własne spektrometru mają składową typu 1/f, dominującą w zakresie małych częstotliwości. Przedstawiono także wyniki uzyskane podczas pomiarów z detekcją synchroniczną,...

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Year 2010
  • Mikroprocesorowy system sterowania sensorami z inerfejsem USB

    Zapotrzebowanie na detekcję gazów oraz zapachów wymaga konstruowania tanich urządzeń o coraz lepszej selektywności i czułości pomiarów. W pracy opisano taki układ pomiarowy, w którym zwiększenie selektywności oraz czułości uzyskano przez pomiar zjawisk fluktuacyjnych w rezystancyjnym czujniku gazów. Opisano sposób pomiaru, wybrany układ pomiarowy oraz projekt i realizację systemu mikroprocesorowego sterującego układem. W zakończeniu...

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  • Pomiary wyładowań niezupełnych w kondensatorach foliowych
    Publication

    Występowanie zjawisk wyładowań niezupełnych w dielektrykach kondensatorów foliowych wpływa na skrócenie ich czasu życia.Stąd, pomiary parametrów wyładowań niezupełnych i ich analiza mogą się przyczynić do poprawy jakości produkowanych kondensatorów.Stosowane metody pomiarowe wyładowań niezupełnych bazują na efektach, jakie te wyładowania wywołują w kondensatorach. Zjawiska wyładowań powodują przepływy prądów, co umożliwia pomiary...

  • Pomiary wyładowań niezupełnych w kondensatorach foliowych
    Publication

    - Year 2010

    Występowanie zjawisk wyładowań niezupełnych w dielektrykach kondensatorów foliowych wpływa na skrócenie ich czasu życia. Stąd, pomiary parametrów wyładowań niezupełnych i ich analiza mogą się przyczynić do poprawy jakości produkowanych kondensatorów. Stosowane metody pomiarowe wyładowań niezupełnych bazują na efektach, jakie te wyładowania wywołują w kondensatorach. Zjawiska wyładowań powodują przepływy prądów, co umożliwia pomiary...

  • Portable raman spectrometer for maritime security applications
    Publication

    - Year 2010

    The fast identification of explosives, narcotics and other chemicals carried on board of ships or transported in containers to the harbors is an important problem of maritime security. Raman spectroscopy is widely used for fast identification of various chemicals. Continuous progress in the field of photonics has resulted in commercial availability of low-power compact Raman spectrometers which can be integrated into portable systems....

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Year 2015
  • New approaches for improving selectivity and sensitivity of resistive gas sensors: a review
    Publication
    • J. Smulko
    • M. Trawka
    • C. G. Granqvist
    • R. Ionescu
    • F. E. Annanouch
    • E. Llobet
    • L. B. Kish

    - Sensor Review - Year 2015

    Purpose – This paper aims to present the methods of improving selectivity and sensitivity of resistance gas sensors. Design/methodology/approach – This paper compares various methods of improving gas sensing by temperature modulation, UV irradiation or fluctuation-enhanced sensing. The authors analyze low-frequency resistance fluctuations in commercial Taguchi gas sensors and the recently developed tungsten trioxide (WO3) gas-sensing...

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  • Nickel Oxide Thin Film Sensor for Fluctuation-Enhanced Gas Sensing of Formaldehyde
    Publication
    • U. Cindemir
    • C. G. Granqvist
    • G. Niklasson
    • L. Österlund
    • M. Trawka
    • J. Smulko

    - Year 2015

    Nanocrystalline nickel-oxide-based thin films were prepared by advanced reactive gas deposition, and the response of these films to formaldehyde was studied by fluctuationenhanced sensing. Morphological and structural analyses showed porous deposits of nickel oxide particles with face-centered cubic structure. Resistance fluctuations were measured upon exposure to ethanol, formaldehyde and methane at 200 °C. Power density spectra...

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  • Noise in biological Raman spectroscopy
    Publication

    - Year 2015

    Raman spectroscopy is a widely used method to investigate chemical molecules by analyzing their vibrational transitions. It utilizes inelastic scattering of the laser light irradiating the investigated object. The scattered light requires appropriate filtering to reduce dominant laser light and expose much weaker components having shifted wavelengths of a characteristic spectral pattern. These components are measured by dispersing...

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Year 2014
  • New approaches for improving selectivity and sensitivity of resistive gas sensors: A review
    Publication
    • J. Smulko
    • M. Trawka
    • L. Hasse
    • C. G. Granqvist
    • R. Ionescu
    • F. E. Annanouch
    • E. Llobet
    • L. B. Kish

    - Year 2014

    Resistive gas sensors are very popular and reliable but suffer from low selectivity and sensitivity. Various methods have been suggested to improve both features without increasing the number of sensors in gas detection systems. Fluctuation enhanced gas sensing was proposed to improve gas detection efficiency by analyzing low-frequency resistance fluctuations, and noise parameters can be more informative than the single DC resistance...

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  • Performance Analysis of the "Intelligent" Kirchhoff- Law - Johnson-Noise Secure Key Exchange
    Publication

    The Kirchhoff-law - Johnson-noise (KLJN) secure key distribution system provides a way of exchanging theoretically secure keys by measuring random voltage and current through the wire connecting two different resistors at Alice’s and Bob’s ends. Recently new advanced protocols for the KLJN method have been proposed with enhanced performance. In this paper, we analyze the KLJN system and compare with the „intelligent” KLJN (iKLJN)...

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  • Quality assessment of ZnO-based varistors by 1/f noise

    Noise has been used as a diagnostic tool of surge arrester varistor structures comprising of ZnO grains of various type and size. The physical and electrical properties of the measured samples have been described. In the experimental study, the applied measurement system and the results of noise measurements for the selected structures of varistors designed for the continuous working voltage 280 V, 440 V and 660 V have been presented....

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Year 2009
Year 2017
  • Noise sources in Raman spectroscopy of biological objects
    Publication

    - Year 2017

    We present an overview of noise sources deteriorating the quality of the recorded biological Raman spectra and the ability to determine the specimen composition. The acquired Raman spectra exhibit intense additive noise components or drifts because of low intensity of the scattered light. Therefore we have to apply expensive or bulky measurement setups to limit their inherent noise or to apply additional signal processing to reduce...

  • Non-Gaussian Resistance Fluctuations in Gold-Nanoparticle-Based Gas Sensors: An Appraisal of Different Evaluation Techniques
    Publication

    - SENSORS - Year 2017

    Volatile organic compounds, such as formaldehyde, can be used as biomarkers in human exhaled breath in order to non-invasively detect various diseases, and the same compounds are of much interest also in the context of environmental monitoring and protection. Here, we report on a recently-developed gas sensor, based on surface-functionalized gold nanoparticles, which is able to generate voltage noise with a distinctly non-Gaussian...

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Year 2007
Year 2022
Year 2020
Year 2023
  • Optimum Choice of Randomly Oriented Carbon Nanotube Networks for UV-Assisted Gas Sensing Applications
    Publication
    • K. Drozdowska
    • A. Rehman
    • J. Smulko
    • A. Krajewska
    • B. Stonio
    • P. Sai
    • A. Przewłoka
    • M. Filipiak
    • K. Pavłov
    • G. Cywinski... and 2 others

    - ACS Sensors - Year 2023

    We investigated the noise and photoresponse characteristics of various optical transparencies of nanotube networks to identify an optimal randomly oriented network of carbon nanotube (CNT)-based devices for UV-assisted gas sensing applications. Our investigation reveals that all of the studied devices demonstrate negative photoconductivity upon exposure to UV light. Our studies confirm the effect of UV irradiation on the electrical...

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  • Probability distribution of flicker noise in AuNPdecorated graphene–Si Schottky barrier diode
    Publication

    - Year 2023

    We present results of the probability distribution analysis of flicker noise generated in Au nanoparticle (AuNP) decorated graphene–Si Schottky barrier diodes with and without yellow light illumination (592 nm), close to the localized surface plasmon resonance in the AuNPs (586 nm). The AuNPs occupy imperfections in the single-layer graphene and reduce the flicker noise intensity generated in the graphene layer. The estimated probability...

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Year 2018
Year 2011
Year 2005
Year 2012
Year 2021
  • Pulsed UV-irradiated Graphene Sensors for Ethanol Detection at Room Temperature
    Publication

    - Year 2021

    A graphene-based gas sensor fabricated in a FET (GFET) configuration and its sensitivity towards ethanol and methane is reported. Detection of ethanol at the level of 100 ppm was observed under pulsed UV irradiation and after cleaning by UV light in the N2 ambient. Reduction of the frequency of UV irradiation pulses resulted in increased changes in sensor resistance in the presence of ethanol. Improved sensing behavior was ascribed...

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