OMG Optical Magnetic Gradiometer
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. Multiple sensors can be synchronized using synchronization units such as SYNC2, SYNC4, and SYNC7.
- Total magnetic field sensor
- Intrinsic magnetic field gradiometer
- Gradiometer baseline: 4 cm (other baselines available)
- Optically pumped alkali metal (rubidium)
- Sensitivity: <0.2 pT/Hz1/2
- Bandwidth: 1 kHz
- Heading error: ±5 nT
- Narrow axial dead zones: <5°
- Field range: 1–100 µT
- Slew rate: >1000 nT/ms
- Sensor volume: 2.4×2.8×16 cm
- Sensor mass: 100 g
- Control unit volume: 3×6×13 cm
- Control unit mass: 400 g
- System power consumption: <5 W (<5 V, 1 A; can run from USB power)
- Serial data output
- RJ-45 8p8c connector: Power, Ground, TX, RX, SYNC+, SYNC–
- RS-485 signaling
- Serial rate 115200 baud
- Software support
Plug it in, and wait for the sensor to warm up. The status light blinks according to the sensor status:
The status code is also reported as the status byte in the data stream:
... 12 49983.918231 3 13 49983.398123 3 14 49983.718472 3 ...
In text mode, the first column is the sequence number that should be sequential; this is useful to make sure you aren't missing points. The second column is the total magnetic field in nanotesla. The last column is the status code.
Firmware update: OMG-R5-firmware-2019-10-01-416bb9.bin
NOTE: PRODUCT UNDER DEVELOPMENT. PROTOTYPES AVAILABLE.
OMG-200/4, inquire for pricing.