Preamplifier with ultra low frequency cutoff for infrasonic condenser microphone

Publication: Research - peer-reviewArticle in proceedings – Annual report year: 2012

Standard

Preamplifier with ultra low frequency cutoff for infrasonic condenser microphone. / Kinnerup, Rasmus Trock; Marbjerg, Kresten; Rasmussen, Per; Knott, Arnold; Thomsen, Ole Cornelius.

Proceedings of ASME 2012 Noise Control and Acoustics Division Conference at InterNoise. American Society of Mechanical Engineers, 2012. p. 605-616.

Publication: Research - peer-reviewArticle in proceedings – Annual report year: 2012

Harvard

Kinnerup, RT, Marbjerg, K, Rasmussen, P, Knott, A & Thomsen, OC 2012, 'Preamplifier with ultra low frequency cutoff for infrasonic condenser microphone'. in Proceedings of ASME 2012 Noise Control and Acoustics Division Conference at InterNoise. American Society of Mechanical Engineers, pp. 605-616., 10.1115/NCAD2012-1468

APA

Kinnerup, R. T., Marbjerg, K., Rasmussen, P., Knott, A., & Thomsen, O. C. (2012). Preamplifier with ultra low frequency cutoff for infrasonic condenser microphone. In Proceedings of ASME 2012 Noise Control and Acoustics Division Conference at InterNoise. (pp. 605-616). American Society of Mechanical Engineers. 10.1115/NCAD2012-1468

CBE

Kinnerup RT, Marbjerg K, Rasmussen P, Knott A, Thomsen OC. 2012. Preamplifier with ultra low frequency cutoff for infrasonic condenser microphone. In Proceedings of ASME 2012 Noise Control and Acoustics Division Conference at InterNoise. American Society of Mechanical Engineers. pp. 605-616. Available from: 10.1115/NCAD2012-1468

MLA

Kinnerup, Rasmus Trock et al. "Preamplifier with ultra low frequency cutoff for infrasonic condenser microphone". Proceedings of ASME 2012 Noise Control and Acoustics Division Conference at InterNoise. American Society of Mechanical Engineers. 2012. 605-616. Available: 10.1115/NCAD2012-1468

Vancouver

Kinnerup RT, Marbjerg K, Rasmussen P, Knott A, Thomsen OC. Preamplifier with ultra low frequency cutoff for infrasonic condenser microphone. In Proceedings of ASME 2012 Noise Control and Acoustics Division Conference at InterNoise. American Society of Mechanical Engineers. 2012. p. 605-616. Available from: 10.1115/NCAD2012-1468

Author

Kinnerup, Rasmus Trock; Marbjerg, Kresten; Rasmussen, Per; Knott, Arnold; Thomsen, Ole Cornelius / Preamplifier with ultra low frequency cutoff for infrasonic condenser microphone.

Proceedings of ASME 2012 Noise Control and Acoustics Division Conference at InterNoise. American Society of Mechanical Engineers, 2012. p. 605-616.

Publication: Research - peer-reviewArticle in proceedings – Annual report year: 2012

Bibtex

@inbook{9a92bf0c2a4342ffac99fc4628b1b178,
title = "Preamplifier with ultra low frequency cutoff for infrasonic condenser microphone",
keywords = "Acoustic noise, Cutoff frequency, Electric impedance, Electric impedance measurement, High pass filters, Shock waves, Condenser microphone, Supersonic flights",
publisher = "American Society of Mechanical Engineers",
author = "Kinnerup, {Rasmus Trock} and Kresten Marbjerg and Per Rasmussen and Arnold Knott and Thomsen, {Ole Cornelius}",
year = "2012",
doi = "10.1115/NCAD2012-1468",
isbn = "9780791845325",
pages = "605-616",
booktitle = "Proceedings of ASME 2012 Noise Control and Acoustics Division Conference at InterNoise",

}

RIS

TY - GEN

T1 - Preamplifier with ultra low frequency cutoff for infrasonic condenser microphone

A1 - Kinnerup,Rasmus Trock

A1 - Marbjerg,Kresten

A1 - Rasmussen,Per

A1 - Knott,Arnold

A1 - Thomsen,Ole Cornelius

AU - Kinnerup,Rasmus Trock

AU - Marbjerg,Kresten

AU - Rasmussen,Per

AU - Knott,Arnold

AU - Thomsen,Ole Cornelius

PB - American Society of Mechanical Engineers

PY - 2012

Y1 - 2012

N2 - Measuring infrasonic sound sets high requirements on the instruments used. Typically the measurement chain consists of a microphone and a preamplifier. As the input resistance of the preamplifier forms a high pass filter with the capacitance of the microphone in the picofarad range, measuring ultra low frequencies becomes a challenge. The electric preamplifier presented in this paper together with a prepolarized condenser microphone form a measurement system. The developed preamplifier connects the microphone signal directly to the input of an operational amplifier with ultra high input impedance. The bias current for the preamplifier further complicates the signal amplification. A configuration of two diode-connected FETs provide<br/>the input bias current. The resulting input impedance of nearly 1 TW yields a total lower limiting -3 dB cutoff frequency of 8 mHz and a dynamic range of 95 dB. Being able to measure down to ultra low frequencies in the infrasonic frequency range will aid actors in the debate on wind turbine noise. Sonic booms from supersonic flights include frequencies down to 10 mHz and the preamplifier proposed in this paper will aid scientists trying to modify the N-shaped shock wave at high level which prohibits flights in land zones.<br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/>

AB - Measuring infrasonic sound sets high requirements on the instruments used. Typically the measurement chain consists of a microphone and a preamplifier. As the input resistance of the preamplifier forms a high pass filter with the capacitance of the microphone in the picofarad range, measuring ultra low frequencies becomes a challenge. The electric preamplifier presented in this paper together with a prepolarized condenser microphone form a measurement system. The developed preamplifier connects the microphone signal directly to the input of an operational amplifier with ultra high input impedance. The bias current for the preamplifier further complicates the signal amplification. A configuration of two diode-connected FETs provide<br/>the input bias current. The resulting input impedance of nearly 1 TW yields a total lower limiting -3 dB cutoff frequency of 8 mHz and a dynamic range of 95 dB. Being able to measure down to ultra low frequencies in the infrasonic frequency range will aid actors in the debate on wind turbine noise. Sonic booms from supersonic flights include frequencies down to 10 mHz and the preamplifier proposed in this paper will aid scientists trying to modify the N-shaped shock wave at high level which prohibits flights in land zones.<br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/>

KW - Acoustic noise

KW - Cutoff frequency

KW - Electric impedance

KW - Electric impedance measurement

KW - High pass filters

KW - Shock waves

KW - Condenser microphone

KW - Supersonic flights

U2 - 10.1115/NCAD2012-1468

DO - 10.1115/NCAD2012-1468

SN - 9780791845325

BT - Proceedings of ASME 2012 Noise Control and Acoustics Division Conference at InterNoise

T2 - Proceedings of ASME 2012 Noise Control and Acoustics Division Conference at InterNoise

SP - 605

EP - 616

ER -