Creation and Modification of Acoustic Signals by Discharge Plasma.
Abstract
Sound production and modification in an Argon discharge plasma was investigated theoretically and experimentally. Sound production by ions in the cathode region was shown to be feasible and consistent with earlier experimental results. A numerical analysis of the theoretical dispersion relation of Ingard and Schulz showed that plasma amplification effects will not compensate for acoustic losses. The theory of the mobility-limited thermionic diode operated as a microphone was expanded. Such microphones were used in an experimental investigation of sound production and modification by a discharge plasma. Possible plasma effects on sound propagation were observed. The characteristics of sound production by the plasma were found to be in reasonable agreement with theory. A departure from theory at low frequencies was interpreted as arising from the effects of particle diffusion, an effect not previously observed in acoustics. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1971
- Accession Number
- AD0728583
Entities
People
- Richard Willis Tripp Jr
Organizations
- Naval Postgraduate School