LionSAT Hybrid Plasma Probe
 
LionProbe Design
1.0   Introduction
2.0   Background
  2.1  Langmuir Theory
  2.2  PFP Theory
  2.3  Plasma Sheath
3.0   Implementation
  3.1  Microprocessor
  3.2  A/D & D/A Convert
  3.3  Electrometer
  3.4  DDS & Comparator
  3.5  Phase Detection
  3.6  Signal Combination
  3.7  Sensor Heads
  3.8  Boom Selection
  3.9  Other Schematics
4.0   Results
5.0   Project Value
6.0   Cost Analysis
7.0   Conclusion
8.0   Future Work
9.0   References
 

Digital/Analog & Analog/Digital Converters

             The basic building blocks of a Langmuir probe are normally a voltage source and an electrometer.  Our proposed implementation for the voltage source is a 12-bit digital to analog converter (DAC).  The microprocessor controls the DAC output level where the DC bias will be applied to the selected plasma sensor head. 

Digital to Analog Converter


Please click on the picture for the full-size schematic

Analog to Digital Converter

Please click on the picture for the full-size schematic