Gravity Gradiometer

The Gravitec gravity gradiometer sensor is comprised of a single sensing element (a ribbon) with a length dimension many times the width. External electronics provide control, measurement and modulation functions. The sensor is versatile in that the sensor element can be configured for airborne, ground, static, or borehole deployment.

Gravitec Gravity Gradiometer Specifications:

  • Dimensions: 400 x 30 x 30 mm
  • Weight: 500 g . Bandwidth: DC - 1 Hz
  • Target Sensitivity: 5 E√Hz flat response
  • Gradients: Txy, Tyx, Txz, Tzx, Tyz, Tzy
  • Resolution: 24 bit sampling resolution
  • Modulation frequency: 5 - 10 Hz
  • Measurements: Gx, y, z, and gradients

 

Gravity Gradiometer Application

Airborne:
The market, while increasingly well established, is constrained by cost of acquisition and data resolution. Gravitec will change the cost dynamics of the airborne market - and this would open up demand and give Gravitec a substantial competitive advantage in a potentially much larger marketplace. In addition, Gravitec's systems will be able to be deployed by a wider variety of airframes resulting in higher utilisation at less costly rates.

Borehole (both exploration & production wells):
Only Gravitec sensors are capable of borehole deployment due their shape, size and simplicity. The commercial benefits of a borehole gravity gradiometer are very considerable for mineral and petroleum applications.

Static:
Semi-permanent sensors deployed for 4D reservoir monitoring. Gravitec has the only technology with a sufficiently low unit cost to create the possibility of relatively high volume production and deployment.

Defence Applications:
Underground chamber detection, land mine detection, passive (non-jammable) navigation systems, static density signature monitoring of container cargo imports for security purposes. Gravitec technology removes the size, cost, and import restriction constraints on gradiometric technology for these applications.

PDAC

Gravity Gradiometer test mass mounted on automated track. The mass shown here is 120 kg and was moved beneath the sensor at 2 cm/s. By removing the outer rings the mass can be configured to 40 kg or 80 kg.

PDAC

Laboratory test data for 3 test mass weights. In the above graphs the red trace is the theoretical calculated gravity gradient response. The blue trace is the measured response from Gravitec's Gravity Gradiometer scaled to eotvos. The measurements made were with a sensor operating at room temperature in strapped-down mode with no temperature, acoustic, or vibration isolation. The results included here are prelimary but repeatable.

Sensor

Gravitec's revolutionary gravity gradiometer sensor. This sensor is one of only two in existance that measure gravity gradients using mechanical modulation to increase sensitivity.