The second generation QZFM sensor (Gen-2) is finally ready for release. In this upgrade, we focussed on mainly two things: (i) reducing the size and weight of the sensor, and (ii) improving manufacturability to support faster production speeds. Along the way, we squeezed out a little more sensitivity and extended the sensor tolerance to background magnetic fields from 50 nT to 200 nT. All other technical specifications of Gen-2 are similar or slightly improved over Gen-1.
For now, the Gen-2 sensor is backward compatible with Gen-1 electronics. We are currently working on a more compact version of the electronics controller (to be released in 2019) which will greatly simplify setup and installation for future high channel count systems.
The driving force behind Gen-2 design was the desire to help move MEG form factor closer to EEG. It was hard to imagine a sleek and comfortable MEG helmet could be designed using Gen-1 QZFM, which is why we worked really hard to develop Gen-2.
The table below provides a quick comparison between Gen-1 and Gen-2.
|Sensitivity||15 fT/√Hz||7-10 fT/√Hz|
|Bandwidth||135 Hz||135 Hz|
|Max background||50 nT||200 nT|
|Standoff||6.0 mm||6.5 mm|
|Size (sensor)||13.0×19.0x110 mm||12.4×16.6×24.4 mm|
|Weight (sensor)||20 g||4 g|
|Cable Weight||10 g/ft||1 g/ft|
|Surface Temp.||∼45 °C||∼41 °C|