Investigation of Electric Discharge Sound in Atmospheric Pressure Plasma Using Optical Wave Microphone

AbstractThe light diffraction technique, which we call the “Optical Wave Microphone (OWM)” technique, is an effective sensing method to detect the sound and is flexible for practical uses as it involves only a simple optical lens system. This technique is also very useful to detect the sound wave without disturbing the sound field. Moreover, OWM can be used for sound field visualization by computerized tomography (CT) because the ultrasmall modulation by the sound field is integrated along the laser beam path. The characteristics of the coplanar DBD (Dielectric Barrier Discharge) operated in air is investigated. Applied voltage, current and the electrical discharge sound of coplanar DBD are measured, and examined the relationship between the micro discharge and the acoustic properties. We expect that understanding of acoustic properties gives more details of electric discharges. These are the first experiments to verify the feasibility of the OWM-CT method for the visualization of the sound field of DBD discharge.

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Investigation of Electric Discharge Sound in Atmospheric Pressure Plasma

Journal of Advanced Oxidation Technologies ◽

10.1515/jaots-2010-0106 ◽

2010 ◽

Vol 13 (1) ◽

Cited By ~ 2

Author(s):

Toshiyuki Nakamiya ◽

Fumiaki Mitsugi ◽

Shota Suyama ◽

Tomoaki Ikegami ◽

Yoshito Sonoda ◽

...

Keyword(s):

Electric Discharge ◽

Sound Field ◽

Atmospheric Pressure Plasma ◽

Dominant Frequency ◽

Medical Diagnostics ◽

Acoustic Properties ◽

Diffraction Effect ◽

Electric Discharges ◽

Optical Wave ◽

Fundamental Relationship

AbstractThe characteristics of the Coplanar DBD (Dielectric Barrier Discharge) operated in air, argon or helium are investigated. Applied voltage, current and the electrical discharge sound of Coplanar DBD discharge are measured, and examined the fundamental relationship between the micro discharge and the acoustic properties. We expect that the understanding of acoustic properties gives more details of electric discharges and also develops new applications in the field of medical diagnostics, environment system, etc. We apply the new method to examine the electric discharge sound using Fraunhofer diffraction effect of visible laser beam. This new system is called the optical wave microphone by us and is very useful for the detection of sound wave without disturbing the sound field. The Fast Fourier Transform (FFT) is applied to discriminate the acoustic sound of the Coplanar DBD discharge and the dominant frequency components.

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A Consideration on Acoustic Properties on Concert-Hall Stages

Building Acoustics ◽

10.1260/1351-010x.18.3-4.221 ◽

2011 ◽

Vol 18 (3-4) ◽

pp. 221-235

Author(s):

Kanako Ueno ◽

Hideki Tachibana

Keyword(s):

Future Study ◽

Experimental Studies ◽

Three Dimensional ◽

Sound Field ◽

Acoustic Properties ◽

Concert Hall ◽

Field Simulation ◽

Experimental Findings ◽

Acoustic Conditions ◽

The Relationship

This paper discusses acoustic properties that musicians experience on a concert hall stage; the discussion is based on the authors' experience gained from conducting experimental studies using a three-dimensional sound field simulation technique. First, the experimental findings on the relationship between the acoustic requirements of musicians and acoustic conditions such as early reflection and reverberation are reviewed. Second, the validity and problems of stage acoustic indices STearly, STlate, and EEL are addressed. In addition, unsolved issues with regard to musicians' requirements during their performance are considered and problems requiring future study are pointed out.

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Development of the Local Ambient Gas Control Technology and its Application to Atmospheric Pressure Plasma Processes

IEEJ Transactions on Sensors and Micromachines ◽

10.1541/ieejsmas.133.164 ◽

2013 ◽

Vol 133 (5) ◽

pp. 164-169 ◽

Cited By ~ 1

Author(s):

Teruki Naito ◽

Nobuaki Konno ◽

Takashi Tokunaga ◽

Toshihiro Itoh

Keyword(s):

Atmospheric Pressure ◽

Atmospheric Pressure Plasma ◽

Control Technology ◽

Pressure Plasma ◽

Ambient Gas ◽

Gas Control

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Ultrasonic Wave Detection in Atmospheric Pressure Plasma Using Fraunhofer Diffraction Effect

PIERS Online ◽

10.2529/piers091220031926 ◽

2010 ◽

Vol 6 (7) ◽

pp. 636-639

Author(s):

Toshiyuki Nakamiya ◽

Fumiaki Mitsugi ◽

Shota Suyama ◽

Tomoaki Ikegami ◽

Yoshito Sonoda ◽

...

Keyword(s):

Ultrasonic Wave ◽

Atmospheric Pressure ◽

Atmospheric Pressure Plasma ◽

Diffraction Effect ◽

Fraunhofer Diffraction ◽

Wave Detection ◽

Pressure Plasma

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Atmospheric Pressure Plasma Deposition of TiO2: A Review

Materials ◽

10.3390/ma13132931 ◽

2020 ◽

Vol 13 (13) ◽

pp. 2931

Author(s):

Soumya Banerjee ◽

Ek Adhikari ◽

Pitambar Sapkota ◽

Amal Sebastian ◽

Sylwia Ptasinska

Keyword(s):

Atmospheric Pressure ◽

Gas Flow ◽

Plasma Deposition ◽

Atmospheric Pressure Plasma ◽

Cost Savings ◽

Historical Background ◽

Pressure Plasma ◽

Wide Range ◽

The Status ◽

Deposition Techniques

Atmospheric pressure plasma (APP) deposition techniques are useful today because of their simplicity and their time and cost savings, particularly for growth of oxide films. Among the oxide materials, titanium dioxide (TiO2) has a wide range of applications in electronics, solar cells, and photocatalysis, which has made it an extremely popular research topic for decades. Here, we provide an overview of non-thermal APP deposition techniques for TiO2 thin film, some historical background, and some very recent findings and developments. First, we define non-thermal plasma, and then we describe the advantages of APP deposition. In addition, we explain the importance of TiO2 and then describe briefly the three deposition techniques used to date. We also compare the structural, electronic, and optical properties of TiO2 films deposited by different APP methods. Lastly, we examine the status of current research related to the effects of such deposition parameters as plasma power, feed gas, bias voltage, gas flow rate, and substrate temperature on the deposition rate, crystal phase, and other film properties. The examples given cover the most common APP deposition techniques for TiO2 growth to understand their advantages for specific applications. In addition, we discuss the important challenges that APP deposition is facing in this rapidly growing field.

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Effects of iodine dopant on atmospheric pressure plasma polymerized pyrrole in remote and coupling methods

Molecular Crystals and Liquid Crystals ◽

10.1080/15421406.2019.1597520 ◽

2018 ◽

Vol 677 (1) ◽

pp. 135-142

Author(s):

Dong Ha Kim ◽

Choon-Sang Park ◽

Eun Young Jung ◽

Bhum Jae Shin ◽

Jae Young Kim ◽

...

Keyword(s):

Atmospheric Pressure ◽

Atmospheric Pressure Plasma ◽

Pressure Plasma ◽

Coupling Methods

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Physical modification of Lepidium perfoliatum seed gum using cold atmospheric-pressure plasma treatment

Food Hydrocolloids ◽

10.1016/j.foodhyd.2021.106902 ◽

2021 ◽

pp. 106902

Author(s):

Fatemeh Sadeghi ◽

Arash Koocheki ◽

Fakhri Shahidi

Keyword(s):

Plasma Treatment ◽

Atmospheric Pressure ◽

Atmospheric Pressure Plasma ◽

Pressure Plasma ◽

Physical Modification ◽

Cold Atmospheric Pressure Plasma ◽

Seed Gum

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Virtual Sound Field of the Roman Theatre of Malaca

Acoustics ◽

10.3390/acoustics3010008 ◽

2021 ◽

Vol 3 (1) ◽

pp. 78-96

Author(s):

Javier Alayón ◽

Sara Girón ◽

José A. Romero-Odero ◽

Francisco J. Nieves

Keyword(s):

3D Model ◽

Sound Field ◽

Acoustic Properties ◽

Archaeological Remains ◽

Roman Emperor ◽

Stone Surface ◽

Process Adjustment ◽

Decay Parameters ◽

The Hill ◽

The City

In Hispania (present-day Spain and Portugal), there are 25 structures documented of classical Roman open-air theatres, of which 10 are in the south, in the Roman Baetica (Andalusia). The Baetica embraced the progress of urbanisation in the time of the Roman emperor Augustus, where theatres, built in stone, were the foci of entertainment, performance, and propaganda of the empire. The Roman theatre in Malaga presents the archaeological remains of the main vestige of the Roman Malaca. It is located in the historical centre of the city, at the foot of the hill of the Muslim Alcazaba and was discovered in 1952. It is a medium-sized theatre whose design corresponds to a mixed construction that combines making use of the hillside for the terraces, in the manner of Greek theatres, with a major construction where rock is non-existent, thereby creating the necessary space for the stands. In this paper, the production process, adjustment, and validation of the 3D model of the theatre are analysed for the creation of a numerical predictive model of its sound field. Acoustic properties of the venue are examined and the effect of the Muslim Alcazaba and the hillside on the various acoustic descriptors is analysed. The results highlight the influence of this large stone surface mainly on the time decay parameters.

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