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Dual Downhole System

Dual Downhole System

Country of Origin:Germany, Geotomographie
Use:Downhole equipment depths up to 100 m

The dual downhole system (DDS) is used to receive P- and S-waves in dry and water filled boreholes in order to determine interval velocities. The DDS consists of two stations each equipped with a tri-axial sensor. The stations are mechanically connected to each other to ensure the alignment of the sensors. Both stations are coupled to the borehole wall by a pneumatic clamping system (inflatable bladder). Air is supplied to the DDS through an electro-pneumatic hybrid cable with a Kevlar tension string. A magnetic compass shows azimuthal deviation to North and can be used to get the orientation of the DDS in the borehole. The cable is terminated by a connector to the seismograph.

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