- A-style Aphasense, C-style Alphasense, SGX or Senko sensors
- D-style Alphasense sensors
- B-style Alphasense sensors
The ‘Quad-stat’ is also designed to handle the B4 line of Alphasense sensors, which incorporate an ‘auxillary’ electrode.
The solder jumpers on the mcp3424 ADCs set the hardware address necessary for proper communication. If the ALPHA_ARRAY flag is enabled on the UPOD, then the solder jumpers on the QuadStat need to be soldered such that:
Gain and Bias
The signal in micro-volts (uV) of each electrode is captured by the UPOD and written to file/streamed via serial. The output contains 8 values, which correspond to the sensors moving from left to to right across the board. Thus:
Where ‘AUX’ is the auxillary electrode (only applicable to the B4 series of Alphasense sensors) and ‘MAIN’ refers to the main working electrode voltage.
|The QuadStat can be outfitted with an aluminum top-plate and fan assembly. The fan assembly has the added benefit of reducing the boundary layer on the surface of the sensor, resulting in increased sensitivity and less variability due to local airflow patterns. The aluminum plate, which is secured to the PCB via aluminum standoffs, acts as a Faraday cage, grounding the entire assembly and helping to reduce noise due to transient EMF.
The build files for the QuadStat include the *.dxf drawing for the aluminum plate, which be cut at any waterjet facility. The bill of materials for the electronics include the four fans. A separate parts list includes the appropriate stand-offs and fasteners. The fans are powered through screw terminals on the QuadStat board.
QuadStat by www.mobilesensingtechnology.com is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License.