The MB3a is an infrasound sensor developed by the CEA, following the MB2000 and MB2005 series, which allows the recording of very-low-frequency acoustic signals over a broad frequency band with an excellent resolution and a large dynamic range.
The MB3 is remarkable for an extremely low level of instrumental noise (<-80 dB.Pa / √ Hz @ 1 Hz) allowing the sensor to resolve more than 10 dB the Low Noise Model. This sensor has been designed especially to meet the requirements of infrasound stations of the International Monitoring System (IMS) network installed as part of the Comprehensive Nuclear Test Ban Treaty (CTBT).
|SEISMO WAVE MB3A|
|Signal Characteristics||Theoretical response (amplitude ± 5%, phase ± 5%)|
|Full Scale Range||Output P (Pa): ±min (12000 [Pa/s]/2.π.f[Hz] ; 1200[Pa])|
|Output Type||Differential. Output dP: ±12000 (Pa/s)|
|Max Output||24 V pp|
|Idle Output||12 V DC (7-20 V) - 120 mW|
|Frequency Response||Flat to within =-3dB from .03Hz to 245Hz or wider band Band limited|
|Self Noise||0.13 mPa/√Hz @ 1 Hz < 10 dB under LNM|
|Dynamic Range||117 dB @ f< 1,6 Hz / 109 dB @ f= 4 Hz|
|Short Circuit Protection||OK|
|DC Output Range||12 V DC (7-20 V) - 120 mW|
|Physical Characteristics||4.3 inch (110 mm) diameter / 5.5 inch (140 mm) tall|
|Operating Temperature||-20 ~ +50C (-30 ~ +70C Housing)|