Table 1.
Comparison of magnetic sensors regarding mobile communication purposes.
| SQUID | Optical Pumping | Hall | Fluxgate | GMR/TMR | AMR | Induction | |
|---|---|---|---|---|---|---|---|
| Detection limit | fT | pT | T | pT | nT | nT | fT-T |
| Power supply | Line | Line | Battery | Battery | Battery | Battery | Battery |
| Size | Medium | Medium | Ultra small | Small | Small | Ultra small | Ultra small-large |
| Measured value | Vectorial | Scalar | Vectorial | Vectorial | Vectorial | Vectorial | Vectorial |
| Sensor noise | Ultra-low | Ultra-low | High | Low | High | Medium | Low |
| Bandwidth | Small | Small | Medium | Medium | Medium | Large | Small |
| Saturation by Earth’s magnetic field | Yes | Yes | No | No | No | No | No |
| Operating temperature | Ultra-low | Normal | Normal | Normal | Normal | Normal | Normal |
| Cost | High | High | Low | Medium | Low | Low | Low |
| Suitability for mobile applications | No | No | Yes | Yes | Yes | Yes | Only small coils |