INVESTIGATION OF ANALOG TECHNIQUES TO DOUBLE DIFFERENTIATE LANGMUIR PROBE CURVES.
Abstract
A small analog computer circuit for double differentiation of Langmuir probe curves has been constructed and its characteristics investigated. The unit was tested with a low-voltage neon discharge tube at sweep rates from 10 to 100 sweeps per second. Comparative results between a Harmonic (probe modulation type) double differentiator and the analog system are presented. The advantages of the analog system are that it shows the entire probe curve and its derivatives simultaneously and that it can follow rapid changes in plasma or probe parameters. Shaping the frequency response of the differentiators reduced the effect of plasma noise sufficiently to permit good resolution of the second derivative signal. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1967
- Accession Number
- AD0821245
Entities
People
- Stuart Edward Garbutt
Organizations
- Air Force Institute of Technology