Charging mechanisms for electrogasdynamic spectral anemometer
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorOscar Biblarz
Life of this patent
Estimating the term…
Abstract
A practical charging mechanism for an electrogasdynamic spectral anemometer sing ultraviolet radiation. Ultraviolet radiation issues through windows in the wall of a test section through which flows a turbulent gas. The UV ionizes aerosol particles in the gas flow. A metallic rod which is connected to a high voltage source picks up ions of one polarity and a collector downstream neutralizes the ions of the opposite polarity. The current generated at the collector is measured and analyzed.
Claims11
An apparatus for measuring the dynamic characteristics of a gas flow comprising:
- (a) means for charging particles in said gas flow, said means for charging including a source of ultraviolet radiation directed into said gas flow;
- (b) means situated downstream from said charging means for neutralizing said charged particles from said gas flow;
- and
- (c) means for measuring the charge and frequency of said charged particles neutralized by said neutralizing means.
Apparatus for measuring the dynamic characteristics of a gas flow comprising:
- (a) a source of ultraviolet radiation focused on said gas flow, said ultraviolet radiation having sufficient energy to ionize aerosols contained in said gas flow to generate charged particles;
- (b) first means for neutralizing charged particles of a selected polarity, said first neutralizing means being disposed downstream from said source of ultraviolet radiation;
- (c) second means for neutralizing charged particles of a selected polarity, said second neutralizing means being disposed downstream from said first neutralizing means;
- and
- (d) means for measuring the charge and frequency of the charged particles neutralized by said second neutralizing means.
Apparatus for measuring the dynamic characteristics of a gas flow comprising:
- (a) a highly charged slender metallic rod having a tip of a photoelectric emitter material;
- (b) a source of ultraviolet energy focused on said tip to cause electrons to be emitted, said electrons attaching to aerosol particles to said gas flow to form charged particles;
- (c) means for neutralizing said charged particles, said neutralizing means being disposed downstream from said metallic rod;
- and
- (d) means for measuring the charge and frequency of the charged particles neutralized by said neutralizing means.
Dependencies are inferred from the claim text.