Meteor Infrasound
The Elginfield Infrasound Array (ELFO)
The Elements
Each element of the ELFO is housed in a vault designed to minimize temperature variations and possible water intake. The equipment housed in the vault includes the microbarograph (microphone), a UPS/GPS and digitizer.
![](../../images/infrasound/uwo-vault.jpg)
The microbarographs are Chapparal model 2.5 units made by Chappral Physics. They have a nominal lower frequency response to the 3 dB point of 0.05 Hz. The upper limit is set by the Nyquist limit of our digitizer frequency (100 Hz). Our units have 12 inlet ports.
![](../../images/infrasound/image011.jpg)
Shown below are the individual elements of the Elginfield Array. Their locations on a map are shown *here*.
![](../../images/infrasound/CELE.jpg)
This is the Center Element, or CELE, Center ELEment.
![](../../images/infrasound/image004.jpg)
Shown above is the Northeast Element, also NEELE, from NorthEast ELEment.
![](../../images/infrasound/image016.jpg)
This is the Southern Element, or SELE, Southern ELEment.
![](../../images/infrasound/image007.jpg)
Also shown here is the Northwest Element, also NWELE, from NorthWest ELEment.