Magnetic & Electrical Characterization
OMG - Optical Magnetic Gradiometer
Description:
OMG is a very high performance total field magnetometer and gradiometer with both high sensitivity and high bandwidth. It uses a special pulsed pump laser recently developed by Twinleaf to provide high atomic spin polarization and very low systematic error. The sensor has a very narrow axial dead zone that is difficult to encounter during typical magnetic survey. The sensor measures magnetic field using a frequency counter and can track very large changes in magnetic field. It recovers immediately from transient magnetic pulses. With its extraordinary dynamic range, it faithfully tracks very large signal variation while maintiaining its high sensitivity.
Specifications:
- Magnetic field gradiometer
- Two total magnetic field sensors
- Gradiometer baseline: 2.3 cm (other baselines available)
- Sensor standoff from front surface: 5.6 mm
- Optically pumped alkali metal (rubidium)
- Sensitivity: <0.2 pT/Hz1/2
- Sample rate: 500 Hz (1 kHz, 4 kHz on request, but sensitivity suffers)
- Heading error: ±5 nT
- Narrow axial dead zones: <±7°
- Field range: 1–100 µT
- Slew rate: >1000 nT/ms
- Sensor volume: 1.6×3.6×13.6 cm
- Sensor mass: 100 g
- Control unit volume: 1.5×6×13 cm
- Control unit mass: 400 g
- System power consumption: 6 W (5V, 1.2A; can run from USB-C PD power source)
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