SEISMIC SENSOR DESIGN

• Seismic Sensors designed to measure Pico Meters in an XYZ configuration.
• Self leveling Seismic sensor plus-minus 45 degrees or axis combinations.
• On land or ocean floor. Pressure compensated.
• Fitted with trigger capture to syncronise recording results.
• To achieve good readings a reliable contact with the material under examination is required.

A noise or vibration source is introduced and this will cause movement in the material. The vibration and echo will vary if the path encounters hollows or other mediums like voids, water, gas and oil pockets.  If the area is then tested and the sensors are moved in a grid pattered a 3D  seismic image can be produced after all the data has been processed. It will in a provide and inner picture that is difficult to achieve using other methods. 

In order to achieve a good and crisp image good field craft needs to be employed.  

The sensor must have good contact with the ground, adding water and making a mud pie and placing the sensor into it. Same goes for the noise source. Set distances, and orientation of the sensors aid processing of the data. The XYZ axis should be aligned and be vertical within plus-minus 5 degrees.

When operating at sea bed levels are not always flat.  To counter this a self leveling unit was also designed.

In field trials by BP and Shell, units equalled or outperformed reference units, and recorded the movement of traffic over 4 miles away at one test site. As this had not happened before, it was initially considered to be noisey units and background noise.