1CEA/DIF/DASE / PONCEAU Damien, PEYRAUD Sébastien, DUPONT Patrick, Stéphane DENIS A low power and low noise infrasound sensor for temporary measurements

1CEA/DIF/DASE / PONCEAU Damien, PEYRAUD Sébastien, DUPONT Patrick, Stéphane DENIS

A low power and low noise infrasound sensor for temporary measurements

Damien PONCEAU, CEA/DIF/DASESébastien PEYRAUD, CEA/DIF/DASE

Patrick DUPONT, CEA/DIF/DASEStéphane DENIS, CEA/DIF/DASE

2008 ITW, Bermuda, 03/11/2008

[email protected] , [email protected], www-dase.cea.fr

CEA/DIF/DASE / PONCEAU Damien, PEYRAUD Sébastien, DUPONT Patrick, Stéphane DENIS 2

2008 ITWPresentation layout

•Temporary measurements :– Examples

– Requirements

•IS Sensors and measuring chains :– State of the art

– Comparison vs temporary measurement requirements

•MB2007 microbarometer :– Principle

– Lumped elements model:• acoustic impedance, response, noise and range

– MB2007 calibration

– Early field results


2008 ITWIMS network, DASE measurement sites

•For each site:– Volume:~ 30 L– Weight: ~ 20 kg– Power consumption:~ 7 W

•Dynamic range:> 108 dB

•Resistant equipment

Pipes, meteo. and telecommunications not

included

http://www.rdss.info/

IS stations installed by DASE


2008 ITWSome temporary measurements in IMS framework

J. Guilbert, P. Harjadi, M. Purbawinata, S. Jammes, A. Le Pichon, B. J. Guilbert, P. Harjadi, M. Purbawinata, S. Jammes, A. Le Pichon, B. Feignier, « Feignier, « Monitoring of Indonesian volcanoes with infrasound : preliminary Monitoring of Indonesian volcanoes with infrasound : preliminary results, results, SURvey of Volcanic Arc of Indonesia », Infrasound Technology », Infrasound Technology Workshop 2005, PAPEETE.Workshop 2005, PAPEETE.

A.A.Le Pichon, K. Antier, S. Vergniolle, M. Lardy, D. Drob, « Le Pichon, K. Antier, S. Vergniolle, M. Lardy, D. Drob, « Validating Validating upper-wind models using infrasound from active volcanoes in Vanuatuupper-wind models using infrasound from active volcanoes in Vanuatu », », Infrasound Technology Workshop 2006, FAIRBANKS.Infrasound Technology Workshop 2006, FAIRBANKS.

A. Smirnov, V. Kunakov, A. Le Pichon, J. Guilbert, D. Ponceau A. Smirnov, V. Kunakov, A. Le Pichon, J. Guilbert, D. Ponceau « Preliminary « Preliminary results of localization and characterization of steady infrasound source as results of localization and characterization of steady infrasound source as detected by I31KZ »,detected by I31KZ », Infrasound Technology Workshop 2007, TOKYO. Infrasound Technology Workshop 2007, TOKYO.


2008 ITWIMS IS Temporary measurements requirements

•Some IMS requirements1:– Able to solve IS Low Noise Model @ 1 Hz.

– Dynamic range > 108 dB.

•Additional requirements2:– Portable, easy to transport and install.

– Plug and play.

– Resistant equipment

– unsensitive to changes of geographical and meteorological conditions.

11 Working Group B, CTBTO Preparatory Commission, « Working Group B, CTBTO Preparatory Commission, « Operational manual for infrasound monitoring and the international exchange of infrasound dataOperational manual for infrasound monitoring and the international exchange of infrasound data », Rev. 10, 7 Sep 2004. », Rev. 10, 7 Sep 2004.22 O. Sow, CTBTO Preparatory Commission, « O. Sow, CTBTO Preparatory Commission, « Terms of reference, procurement of infrasound experimental arrayTerms of reference, procurement of infrasound experimental array », CTBTO Preparatory Commission Request for proposal, ref. », CTBTO Preparatory Commission Request for proposal, ref.

no. 2007-0213/SOW, 22 Aug 2007.no. 2007-0213/SOW, 22 Aug 2007.


2008 ITWNew “24 bits” acquisition systems

•Common features1:– Portable & plug and play:

• Power input range :

~ [9, 30] V

• Volume :

< 5 L• Weight :

< 5 kg• Power consumption :

< 1.5 W

– Dynamic range

(with symmetric input)

> 120 dB


– And others11 A A. Brisbourne, A. Paul, M. Alvarez, R. Sleeman, « . Brisbourne, A. Paul, M. Alvarez, R. Sleeman, « State of the art digitizersState of the art digitizers », ORFEUS NERIES joint workshop, October 2007. », ORFEUS NERIES joint workshop, October 2007.


2008 ITWMB 2005 : Current solution vs requirements

– Portable & plug and play:• Power input range:

~ [9; 30] V

• Volume & Weight:

< 20 L, < 15 kg

• Power consumption:

< 3 W (up to 2 W)

– Dynamic range:> 108 dB (sensor)

> 120 dB (digitizer)


~ 450 x 300 x 200 mm3

Pipes, meteo. and telecommunications not

included

2 days batteries included.


2008 ITWMB2007 microbarometer : objectives

•A new Absolute pressure sensor : MB2007

• Low power

• Integrated calibration

• Optimize the use of digitizer dynamic range

• Portable

• Reliable

• To better fit the low noise model at low frequencies


2008 ITWMB2007 microbarometer: principle

pianpi

pianpi

vAq

pAF

pibom

bombo

UvBL

iBLF


2008 ITWMB2007 microbarometer: acoustic impedance

Modelled as a capacitance over infrasound frequency band

Aneroid capsule impedance, Zaan

Bellows and reference cavity spring rates are predominant over infrasound frequency band

First batch of prototypes:

Zedr >> Zece

ainamcaan

adraceaan

ZZZ

ZZZ


2008 ITWMB2007 microbarometer calibration, 10 Pa sinus

an

man

je

jo

j K

BLA

pj

UH

Aan, aneroid capsule effective areaBLm, velocity transducer generator constant

Kan, aneroid capsule spring rateUo, output voltagepe, input pressure

Considering previous simplifications:

1 2

3 4MB2007& IS Calibrator


2008 ITWMB2007 microbarometer : calibration results


2008 ITWMB2007 vs MB2005 comparison in LOR


2008 ITWMB2007: noise measurements @ LOR

Amplifier voltage noise

Coil resistance thermal noise


2008 ITWMB2007 pressure range

Mechanics

Digitizer


2008 ITWMB2007 specifications

MB2005 MB2007

Static Dynamic Range

+/- 100 hPa +/- 250 hPa

Weight 5.5 kg < 2.5 kg

Volume 3 L < 1 L

Power consumption 3 W passive

Relative Calibration NO YES

MB2007 & MB2005


2008 ITWConclusion : near future measuring chain

– Portable & plug and play:• Power input range:

~ [9; 36] V

• Volume & Weight:

5 L, 9 kg

• Power consumption:

< 800 mW (up to 300 mW)

– Dynamic range:> 130 dB (sensor)

> 120 dB (digitizer)



2008 ITWConclusions & Outlooks

•Temporary infrasound measurements imply new requirements for equipments.

•Thanks to recent developments in digitizers and infrasound sensors, more appropriate solutions become available.

•MB2007 outlooks:– Models and uncertainties on each parameters to improve

– Susceptibility to harsh environments to study

– Susceptibility to aging to study

– To measure signals, collocated with other sensors

Documents

1CEA/DIF/DASE / PONCEAU Damien, PEYRAUD Sébastien, DUPONT Patrick, Stéphane DENIS A low power and low noise infrasound sensor for temporary measurements