PPM Pulsed Pump Magnetometer
PPM is an extremely high performance total field magnetometer. It features sensitivity better than 200 fT//Hz1/2, making it the highest sensitivity magnetometer that you can buy.
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 unique 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.
Features
- Sensor standoff from front surface: 5.6 mm
- Optically pumped alkali metal (rubidium)
- Sensitivity: <0.2 pT/Hz1/2
- Sample rate: 480 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: 5 W (5V, 1.0A; can run from USB-C PD power source)
Interface
- USB-C
- 5 W capable port required.
- Serial data output
- RJ-45 8p8c connector: Power, LVDS Serial, LVDS Sync Clock
- Software support
Images
Operation
Plug it in, and wait for the sensor to warm up. The status light blinks according to the sensor status:
| Code | Color | Status |
|---|---|---|
| -3 | Red/Black | Hardware Error |
| -2 | Red/Black | Low Voltage |
| -1 | Red/Black | Error |
| 0 | White/Black | Idle/off |
| 1 | Red/White | Cell heating |
| 2 | Purple/Red | Pump locking |
| 3 | Yellow/Red | Probe locking |
| 4 | Blue/White | Lasers locked; no signal |
| 5 | Green/White | Operational |
The status code is also reported as the status byte in the data stream:
...
12 49983.918231 5
13 49983.398123 5
14 49983.718472 5
...
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.
Ordering
PPM-200, inquire for price.