TY  - JOUR
AU  - Baglioni, Gabriele
AU  - Pezone, Roberto
AU  - Vollebregt, Sten
AU  - Cvetanović-Zobenica, Katarina
AU  - Spasenović, Marko
AU  - Todorović, Dejan
AU  - Liu, Hanquing
AU  - Verbiest, Gerard J.
AU  - van der Zant, Herre S. J.
AU  - Steeneken, Peter G.
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6801
AB  - Microphones exploit the motion of suspended membranes to detect sound waves. Since the microphone performance can be improved by reducing the thickness and mass of its sensing membrane, graphene-based microphones are expected to outperform state-of-the-art microelectromechanical (MEMS) microphones and allow further miniaturization of the device. Here, we present a laser vibrometry study of the acoustic response of suspended multilayer graphene membranes for microphone applications. We address performance parameters relevant for acoustic sensing, including mechanical sensitivity, limit of detection and nonlinear distortion, and discuss the trade-offs and limitations in the design of graphene microphones. We demonstrate superior mechanical sensitivities of the graphene membranes, reaching more than 2 orders of magnitude higher compliances than commercial MEMS devices, and report a limit of detection as low as 15 dBSPL, which is 10–15 dB lower than that featured by current MEMS microphones.
PB  - Royal Society of Chemistry
T2  - Nanoscale
T1  - Ultra-sensitive graphene membranes for microphone applications
VL  - 15
VL  - 6352
SP  - 6343
DO  - 10.1039/D2NR05147H
ER  - 

@article{
author = "Baglioni, Gabriele and Pezone, Roberto and Vollebregt, Sten and Cvetanović-Zobenica, Katarina and Spasenović, Marko and Todorović, Dejan and Liu, Hanquing and Verbiest, Gerard J. and van der Zant, Herre S. J. and Steeneken, Peter G.",
year = "2023",
abstract = "Microphones exploit the motion of suspended membranes to detect sound waves. Since the microphone performance can be improved by reducing the thickness and mass of its sensing membrane, graphene-based microphones are expected to outperform state-of-the-art microelectromechanical (MEMS) microphones and allow further miniaturization of the device. Here, we present a laser vibrometry study of the acoustic response of suspended multilayer graphene membranes for microphone applications. We address performance parameters relevant for acoustic sensing, including mechanical sensitivity, limit of detection and nonlinear distortion, and discuss the trade-offs and limitations in the design of graphene microphones. We demonstrate superior mechanical sensitivities of the graphene membranes, reaching more than 2 orders of magnitude higher compliances than commercial MEMS devices, and report a limit of detection as low as 15 dBSPL, which is 10–15 dB lower than that featured by current MEMS microphones.",
publisher = "Royal Society of Chemistry",
journal = "Nanoscale",
title = "Ultra-sensitive graphene membranes for microphone applications",
volume = "15, 6352",
pages = "6343",
doi = "10.1039/D2NR05147H"
}

Baglioni, G., Pezone, R., Vollebregt, S., Cvetanović-Zobenica, K., Spasenović, M., Todorović, D., Liu, H., Verbiest, G. J., van der Zant, H. S. J.,& Steeneken, P. G.. (2023). Ultra-sensitive graphene membranes for microphone applications. in Nanoscale
Royal Society of Chemistry., 15, 6343.
https://doi.org/10.1039/D2NR05147H

Baglioni G, Pezone R, Vollebregt S, Cvetanović-Zobenica K, Spasenović M, Todorović D, Liu H, Verbiest GJ, van der Zant HSJ, Steeneken PG. Ultra-sensitive graphene membranes for microphone applications. in Nanoscale. 2023;15:6343.
doi:10.1039/D2NR05147H .

Baglioni, Gabriele, Pezone, Roberto, Vollebregt, Sten, Cvetanović-Zobenica, Katarina, Spasenović, Marko, Todorović, Dejan, Liu, Hanquing, Verbiest, Gerard J., van der Zant, Herre S. J., Steeneken, Peter G., "Ultra-sensitive graphene membranes for microphone applications" in Nanoscale, 15 (2023):6343,
https://doi.org/10.1039/D2NR05147H . .

TY  - JOUR
AU  - Salom, Iva
AU  - Dimić, Goran
AU  - Čelebić, Vladimir
AU  - Spasenović, Marko
AU  - Raičković, Milica
AU  - Mihajlović, Mirjana
AU  - Todorović, Dejan
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5639
AB  - Airborne acoustic surveillance would enable and ease several applications, including
security surveillance, urban and industrial noise monitoring, rescue missions, and wildlife monitoring.
Airborne surveillance with an acoustic camera mounted on an airship would provide the deployment
flexibility and utility required by these applications. Nevertheless, and problematically for these
applications, there is not a single acoustic camera mounted on an airship yet. We make significant
advances towards solving this problem by designing and constructing an acoustic camera for direct
mounting on the hull of a UAV airship. The camera consists of 64 microphones, a central processing
unit, and software for data acquisition and processing dedicatedly developed for far-field low-level
acoustic signal detection. We demonstrate a large-aperture mock-up camera operation on the ground,
although all preparations have been made to integrate the camera onto an airship. The camera has
an aperture of 2 m and has been designed for surveillance from a height up to 300 m, with a spatial
resolution of 12 m.
PB  - Switzerland : Multidisciplinary Digital Publishing Institute (MDPI)
T2  - Sensors
T1  - An Acoustic Camera for Use on UAVs
VL  - 23
IS  - 2
SP  - 880
DO  - 10.3390/s23020880
ER  - 

@article{
author = "Salom, Iva and Dimić, Goran and Čelebić, Vladimir and Spasenović, Marko and Raičković, Milica and Mihajlović, Mirjana and Todorović, Dejan",
year = "2023",
abstract = "Airborne acoustic surveillance would enable and ease several applications, including
security surveillance, urban and industrial noise monitoring, rescue missions, and wildlife monitoring.
Airborne surveillance with an acoustic camera mounted on an airship would provide the deployment
flexibility and utility required by these applications. Nevertheless, and problematically for these
applications, there is not a single acoustic camera mounted on an airship yet. We make significant
advances towards solving this problem by designing and constructing an acoustic camera for direct
mounting on the hull of a UAV airship. The camera consists of 64 microphones, a central processing
unit, and software for data acquisition and processing dedicatedly developed for far-field low-level
acoustic signal detection. We demonstrate a large-aperture mock-up camera operation on the ground,
although all preparations have been made to integrate the camera onto an airship. The camera has
an aperture of 2 m and has been designed for surveillance from a height up to 300 m, with a spatial
resolution of 12 m.",
publisher = "Switzerland : Multidisciplinary Digital Publishing Institute (MDPI)",
journal = "Sensors",
title = "An Acoustic Camera for Use on UAVs",
volume = "23",
number = "2",
pages = "880",
doi = "10.3390/s23020880"
}

Salom, I., Dimić, G., Čelebić, V., Spasenović, M., Raičković, M., Mihajlović, M.,& Todorović, D.. (2023). An Acoustic Camera for Use on UAVs. in Sensors
Switzerland : Multidisciplinary Digital Publishing Institute (MDPI)., 23(2), 880.
https://doi.org/10.3390/s23020880

Salom I, Dimić G, Čelebić V, Spasenović M, Raičković M, Mihajlović M, Todorović D. An Acoustic Camera for Use on UAVs. in Sensors. 2023;23(2):880.
doi:10.3390/s23020880 .

Salom, Iva, Dimić, Goran, Čelebić, Vladimir, Spasenović, Marko, Raičković, Milica, Mihajlović, Mirjana, Todorović, Dejan, "An Acoustic Camera for Use on UAVs" in Sensors, 23, no. 2 (2023):880,
https://doi.org/10.3390/s23020880 . .

TY  - JOUR
AU  - Pavlović, Marko
AU  - Nikolić, Jasmina
AU  - Andrić, Ljubisa
AU  - Todorović, Dejan
AU  - Božić, Katarina
AU  - Drmanić, Saša
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5250
AB  - This paper is focused on the preparation procedures, using a talc-based filler, to improve the rheologic properties of the lost foam refractory coatings. Talc, with grain size of 40 .m, was mechanically activated in a vibration mill over the following times: 10, 20 and 30 min. Depending on the time required for the mechanical activation, the change in the filler grain size and shape was analysed along their effects on the talc-filled lost foam coating dispersion ability and stability. In order to characterize the filler, the following methods were used: X-ray diffraction, scanning electron microscopy and optic microscopy. The coating composition was tuned by choosing the suitable grain size and shape factor of the activated filler. In addition, different coating components (additives, solvent) were applied to alter the coating generation procedure. It was shown that the application of this type of the lost foam refractory coatings - water-based coatings - have a positive influence on quality of the aluminium alloy castings, which contributes to reducing the cost of cleaning and processing of the castings. Also, alcohol-based refractory coatings with talc-based activated fillers were tested and used to have the castings produced in the sand moulds.
AB  - Истраживање је фокусирано на поступке припреме пуниоца на бази талка у циљу побољшања реолошких својстава “lost foam” ватросталних премаза. Талк величине зрна од 40 m механички је активиран у вибрационом млину у временима од 10, 20 и 30 min.  У зависности од времена механичке активације, анализирана је промена величине и облика зрна пуниоца заједно са њиховим утицајем на дисперзност и стабилност суспензије премаза. За карактеризацију пуниоца коришћене су следеће методе: рендгенска дифракциона анализа, скенинг електронска и оптичка микорскопија. Испитиван је утицај састава премаза избором подесне величине и облика зрна активираног пуниоца на квалитет премаза. Осим тога, примењене су различите компоненте премаза и измењен је поступак израде премаза. Показано је да је примена ове врсте “lost foam” ватросталних премаза на воденој основи имала позитиван утицај на квалитет одливака од легура алуминијума. Такође, тестирани су ватростални премази на бази алкохола са активираним пуниоцем на бази талка који су коришћени за ливење одливака у калупе од песка.
T2  - Journal of the Serbian Chemical Society
T1  - Synthesis of the new lost foam refractory coatings based on talc
T1  - Синтеза нових “lost foam” ватросталних премаза на бази талка
VL  - 87
IS  - 4
SP  - 491
EP  - 503
DO  - 10.2298/JSC211019111P
ER  - 

@article{
author = "Pavlović, Marko and Nikolić, Jasmina and Andrić, Ljubisa and Todorović, Dejan and Božić, Katarina and Drmanić, Saša",
year = "2022",
abstract = "This paper is focused on the preparation procedures, using a talc-based filler, to improve the rheologic properties of the lost foam refractory coatings. Talc, with grain size of 40 .m, was mechanically activated in a vibration mill over the following times: 10, 20 and 30 min. Depending on the time required for the mechanical activation, the change in the filler grain size and shape was analysed along their effects on the talc-filled lost foam coating dispersion ability and stability. In order to characterize the filler, the following methods were used: X-ray diffraction, scanning electron microscopy and optic microscopy. The coating composition was tuned by choosing the suitable grain size and shape factor of the activated filler. In addition, different coating components (additives, solvent) were applied to alter the coating generation procedure. It was shown that the application of this type of the lost foam refractory coatings - water-based coatings - have a positive influence on quality of the aluminium alloy castings, which contributes to reducing the cost of cleaning and processing of the castings. Also, alcohol-based refractory coatings with talc-based activated fillers were tested and used to have the castings produced in the sand moulds., Истраживање је фокусирано на поступке припреме пуниоца на бази талка у циљу побољшања реолошких својстава “lost foam” ватросталних премаза. Талк величине зрна од 40 m механички је активиран у вибрационом млину у временима од 10, 20 и 30 min.  У зависности од времена механичке активације, анализирана је промена величине и облика зрна пуниоца заједно са њиховим утицајем на дисперзност и стабилност суспензије премаза. За карактеризацију пуниоца коришћене су следеће методе: рендгенска дифракциона анализа, скенинг електронска и оптичка микорскопија. Испитиван је утицај састава премаза избором подесне величине и облика зрна активираног пуниоца на квалитет премаза. Осим тога, примењене су различите компоненте премаза и измењен је поступак израде премаза. Показано је да је примена ове врсте “lost foam” ватросталних премаза на воденој основи имала позитиван утицај на квалитет одливака од легура алуминијума. Такође, тестирани су ватростални премази на бази алкохола са активираним пуниоцем на бази талка који су коришћени за ливење одливака у калупе од песка.",
journal = "Journal of the Serbian Chemical Society",
title = "Synthesis of the new lost foam refractory coatings based on talc, Синтеза нових “lost foam” ватросталних премаза на бази талка",
volume = "87",
number = "4",
pages = "491-503",
doi = "10.2298/JSC211019111P"
}

Pavlović, M., Nikolić, J., Andrić, L., Todorović, D., Božić, K.,& Drmanić, S.. (2022). Synthesis of the new lost foam refractory coatings based on talc. in Journal of the Serbian Chemical Society, 87(4), 491-503.
https://doi.org/10.2298/JSC211019111P

Pavlović M, Nikolić J, Andrić L, Todorović D, Božić K, Drmanić S. Synthesis of the new lost foam refractory coatings based on talc. in Journal of the Serbian Chemical Society. 2022;87(4):491-503.
doi:10.2298/JSC211019111P .

Pavlović, Marko, Nikolić, Jasmina, Andrić, Ljubisa, Todorović, Dejan, Božić, Katarina, Drmanić, Saša, "Synthesis of the new lost foam refractory coatings based on talc" in Journal of the Serbian Chemical Society, 87, no. 4 (2022):491-503,
https://doi.org/10.2298/JSC211019111P . .