Transcript A low power and low noise infrasound sensor for temporary measurements Damien PONCEAU, CEA/DIF/DASE Sébastien PEYRAUD, CEA/DIF/DASE Patrick DUPONT, CEA/DIF/DASE Stéphane DENIS, CEA/DIF/DASE 2008 ITW, Bermuda,

A low power and low noise infrasound
sensor for temporary measurements
Damien PONCEAU, CEA/DIF/DASE
Sébastien PEYRAUD, CEA/DIF/DASE
Patrick DUPONT, CEA/DIF/DASE
Stéphane 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
1
Presentation layout
2008 ITW
• 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
CEA/DIF/DASE / PONCEAU Damien, PEYRAUD Sébastien, DUPONT Patrick, Stéphane DENIS
2
IMS network, DASE measurement sites
2008 ITW
IS stations installed by DASE
http://www.rdss.info/
• For each site:
Pipes, meteo. and
telecommunications not
included
– Volume:~ 30 L
– Weight: ~ 20 kg
– Power consumption:~ 7 W
• Dynamic range:
> 108 dB
• Resistant equipment
CEA/DIF/DASE / PONCEAU Damien, PEYRAUD Sébastien, DUPONT Patrick, Stéphane DENIS
3
Some temporary measurements in IMS framework
2008 ITW
J. Guilbert, P. Harjadi, M. Purbawinata, S. Jammes, A. Le Pichon, B.
Feignier, « Monitoring of Indonesian volcanoes with infrasound : preliminary
results, SURvey of Volcanic Arc of Indonesia », Infrasound Technology
Workshop 2005, PAPEETE.
A.Le Pichon, K. Antier, S. Vergniolle, M. Lardy, D. Drob, « Validating upperwind models using infrasound from active volcanoes in Vanuatu », Infrasound
Technology Workshop 2006, FAIRBANKS.
A. Smirnov, V. Kunakov, A. Le Pichon, J. Guilbert, D. Ponceau « Preliminary
results of localization and characterization of steady infrasound source as
detected by I31KZ », Infrasound Technology Workshop 2007, TOKYO.
CEA/DIF/DASE / PONCEAU Damien, PEYRAUD Sébastien, DUPONT Patrick, Stéphane DENIS
4
IMS IS Temporary measurements requirements
2008 ITW
• 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.
1 Working Group B, CTBTO Preparatory Commission, « Operational manual for infrasound monitoring and the international exchange of infrasound data », Rev. 10, 7 Sep
2004.
2 O. Sow, CTBTO Preparatory Commission, « Terms of reference, procurement of infrasound experimental array », CTBTO Preparatory Commission Request for proposal,
ref. no. 2007-0213/SOW, 22 Aug 2007.
CEA/DIF/DASE / PONCEAU Damien, PEYRAUD Sébastien, DUPONT Patrick, Stéphane DENIS
5
New “24 bits” acquisition systems
2008 ITW
• Common features1:
– Portable & plug and play:
• Power input range :
~ [9, 30] V
• Volume :
<5L
• Weight :
< 5 kg
• Power consumption :
< 1.5 W
1
– Dynamic range
(with symmetric input)
> 120 dB
– Resistant equipment
– And others
A. Brisbourne, A. Paul, M. Alvarez, R. Sleeman, « State of the art digitizers », ORFEUS NERIES joint workshop, October 2007.
CEA/DIF/DASE / PONCEAU Damien, PEYRAUD Sébastien, DUPONT Patrick, Stéphane DENIS
6
MB 2005 : Current solution vs requirements
2008 ITW
– Portable & plug and play:
Pipes, meteo. and
telecommunications not
included
2 days batteries included.
• 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
– Resistant equipment
CEA/DIF/DASE / PONCEAU Damien, PEYRAUD Sébastien, DUPONT Patrick, Stéphane DENIS
7
MB2007 microbarometer : objectives
2008 ITW
•A new Absolute pressure sensor : MB2007
• Low power
• Portable
• Integrated calibration
• Reliable
• Optimize the use of digitizer dynamic range
• To better fit the low noise model at low frequencies
CEA/DIF/DASE / PONCEAU Damien, PEYRAUD Sébastien, DUPONT Patrick, Stéphane DENIS
8
MB2007 microbarometer: principle
2008 ITW
 F pi  Aan  p pi

 q pi  Aan  v pi
 Fbo  BL m  ibo

 BL m  v bo  U pi
CEA/DIF/DASE / PONCEAU Damien, PEYRAUD Sébastien, DUPONT Patrick, Stéphane DENIS
9
MB2007 microbarometer: acoustic impedance
2008 ITW
Aneroid capsule impedance, Zaan
Bellows and reference cavity spring rates are
predominant over infrasound frequency band
First batch of prototypes:
Zedr >> Zece
Modelled as a capacitance over infrasound
frequency band
 Z aan  Z ace  Z adr

 Z aan  Z amc  Z ain
CEA/DIF/DASE / PONCEAU Damien, PEYRAUD Sébastien, DUPONT Patrick, Stéphane DENIS
10
MB2007 microbarometer calibration, 10 Pa sinus
Considering previous simplifications:
H  j  
U o  j 
j   p e  j 

A an BL m
K an
2008 ITW
Aan, aneroid capsule effective area
BLm, velocity transducer generator constant
Kan, aneroid capsule spring rate
Uo, output voltage
pe, input pressure
1
2
3
4
MB2007& IS Calibrator
CEA/DIF/DASE / PONCEAU Damien, PEYRAUD Sébastien, DUPONT Patrick, Stéphane DENIS
11
MB2007 microbarometer : calibration results
CEA/DIF/DASE / PONCEAU Damien, PEYRAUD Sébastien, DUPONT Patrick, Stéphane DENIS
2008 ITW
12
MB2007 vs MB2005 comparison in LOR
CEA/DIF/DASE / PONCEAU Damien, PEYRAUD Sébastien, DUPONT Patrick, Stéphane DENIS
2008 ITW
13
MB2007: noise measurements @ LOR
2008 ITW
Amplifier voltage noise
Coil resistance thermal noise
CEA/DIF/DASE / PONCEAU Damien, PEYRAUD Sébastien, DUPONT Patrick, Stéphane DENIS
14
MB2007 pressure range
2008 ITW
Mechanics
CEA/DIF/DASE / PONCEAU Damien, PEYRAUD Sébastien, DUPONT Patrick, Stéphane DENIS
15
MB2007 specifications
MB2005
MB2007
Static Dynamic
Range
+/- 100 hPa
+/- 250 hPa
Weight
5.5 kg
< 2.5 kg
Volume
3L
<1L
Power consumption
3W
passive
Relative Calibration
NO
YES
2008 ITW
MB2007 & MB2005
CEA/DIF/DASE / PONCEAU Damien, PEYRAUD Sébastien, DUPONT Patrick, Stéphane DENIS
16
Conclusion : near future measuring chain
2008 ITW
– 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)
– Resistant equipment
CEA/DIF/DASE / PONCEAU Damien, PEYRAUD Sébastien, DUPONT Patrick, Stéphane DENIS
17
Conclusions & Outlooks
2008 ITW
• 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
CEA/DIF/DASE / PONCEAU Damien, PEYRAUD Sébastien, DUPONT Patrick, Stéphane DENIS
18