Digital smoothing of the Langmuir probe I-V characteristic
Journal Article
·
· Review of Scientific Instruments
- Science Institute, University of Iceland, Dunhaga 3, IS-107 Reykjavk (Iceland)
Electrostatic probes or Langmuir probes are the most common diagnostic tools in plasma discharges. The second derivative of the Langmuir probe I-V characteristic is proportional to the electron energy distribution function. Determining the second derivative accurately requires some method of noise suppression. We compare the Savitzky-Golay filter, the Gaussian filter, and polynomial fitting to the Blackman filter for digitally smoothing simulated and measured I-V characteristics. We find that the Blackman filter achieves the most smoothing with minimal distortion for noisy data.
- OSTI ID:
- 21124038
- Journal Information:
- Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 7 Vol. 79; ISSN 0034-6748; ISSN RSINAK
- Country of Publication:
- United States
- Language:
- English
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