Investigation of the feasibility of sensing transient velocity by means of gaseous ionization
| dc.contributor.author | Huang, Hsien-Lu | en |
| dc.contributor.department | Electrical Engineering | en |
| dc.date.accessioned | 2019-07-03T20:33:48Z | en |
| dc.date.available | 2019-07-03T20:33:48Z | en |
| dc.date.issued | 1968 | en |
| dc.description.abstract | Sensitivity S<sup>i</sup><sub>p</sub> is defined as the ratio of the fractional change of gas ionization current to the fractional change of gas pressure. A maximum obtainable sensitivity was calculated, S<sup>i</sup><sub>p</sub>]<sub>max</sub> = -0.309 A/B V, where A, B are constants for a given gas within a particular range of field-to-pressure ratio. Experiments were conducted to investigate the sensitivity of air and krypton under different combinations of voltage, electrode separation and primary electron source strength. A curie of tritium placed on the central portion of either electrode produced a constant initial emission current and a high sensitivity. Sensitivity could be increased by using a stronger current source, higher voltage and a larger electrode separation. Observed values of S<sup>i</sup><sub>p</sub> for high voltage at larger separation are greater than those expected even when breakdown occurs at a (pd) quite larger than the one for S<sup>i</sup><sub>p</sub>]<sub>max</sub>. The fractional pressure change, Δp/p, is independent of the initial pressure, p, and is greater for a heavier gas subject to the same acceleration, a fact which suggests the use of a heavier gas to obtain a higher fractional current change for the same sensitivity. Krypton behaves in a similar way as air in the system. Operating current level may be higher than 10⁻⁵ ampere if stronger source is used. There is a limit in the separation for a given source configuration. Further increase in S<sup>i</sup><sub>p</sub> and current level may be achieved through better design of the configuration and location of the current source between the electrodes. The fractional current change, Δi/i, depends more on Δp rather than on the initial operating pressure, p. From the experiment performed, it appears that a gas system will perform satisfactorily as a transient velocity gauge. | en |
| dc.description.degree | M.S. | en |
| dc.format.extent | ix, 81, [2] leaves | en |
| dc.format.mimetype | application/pdf | en |
| dc.identifier.uri | http://hdl.handle.net/10919/91111 | en |
| dc.language.iso | en_US | en |
| dc.publisher | Virginia Polytechnic Institute | en |
| dc.relation.isformatof | OCLC# 20223462 | en |
| dc.rights | In Copyright | en |
| dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | en |
| dc.subject.lcc | LD5655.V855 1968.H8 | en |
| dc.subject.lcsh | Ionization of gases | en |
| dc.subject.lcsh | Speed | en |
| dc.title | Investigation of the feasibility of sensing transient velocity by means of gaseous ionization | en |
| dc.type | Thesis | en |
| dc.type.dcmitype | Text | en |
| thesis.degree.discipline | Electrical Engineering | en |
| thesis.degree.grantor | Virginia Polytechnic Institute | en |
| thesis.degree.level | masters | en |
| thesis.degree.name | M.S. | en |
Files
Original bundle
1 - 1 of 1