Honeycomb filter defect detecting method
OwnerTimothy A. Park, Michael George Shultz +1inventors
InventorsTimothy A. Park, Michael George Shultz, David John Worthey
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Abstract
A method for detecting defects in a honeycomb filter body. In operation, a gas flow stream containing particulates emerges at an outlet end face of the honeycomb body through defects, if any, in the honeycomb walls and/or plugs where they are illuminated. The gas flow stream containing the particles are provided at varying flow rates, pressures and particle densities during the course of the test cycle, thereby improving the signal-to-noise ratio, and reducing turbulence within the gas flow stream such that any defects within the filter body may be more readily detected.
Claims20
A method of detecting defects in a honeycomb structure comprising the steps of:
- providing a honeycomb structure having an inlet face and an outlet face;
- providing a gas flow stream containing particles to the inlet face of the honeycomb structure, wherein the particles are provided at a first density and such that at least a portion of the particles are emitted from the outlet face of the honeycomb structure;
- reducing the amount of particles within the gas flow stream to a second density that is less than the first density;
- providing a particle detection device;
- and
- detecting an amount of particles emitted from the outlet face of the honeycomb structure with the particle detection device subsequent to reducing the density of the particles from the first density to the second density.
A method of detecting defects in a honeycomb structure comprising the steps of:
- flowing a gas flow stream containing particles in an inlet face of a honeycomb structure at a first flow rate, a first pressure and a given particle density;
- reducing the gas flow stream to a second flow rate that is less than the first flow rate and a second pressure that is less that the first pressure;
- and
- detecting an amount of particles emitted from an outlet face of the honeycomb structure subsequent to reducing the gas flow stream from the first flow rate to the second flow rate and the first pressure to the second pressure.
A method of detecting defects in a honeycomb structure comprising the steps of:
- providing a honeycomb structure having an inlet face and an outlet face;
- providing a gas flow stream containing particles to the inlet face of the honeycomb structure, wherein the gas flow stream is provided at a first flow rate and a first pressure, and wherein the particles are provided at a first density and such that at least a portion of the particles are emitted from the outlet face of the honeycomb structure;
- reducing the gas flow stream to a second flow rate that is less than the first flow rate, a second pressure that is less that the first pressure, and a second density that is less than the first density;
- providing a particle detection device;
- and
- detecting an amount of particles emitted from an outlet face of the honeycomb structure subsequent to reducing the gas flow stream from the first flow rate to the second flow rate, the first pressure to the second pressure, and the first density to the second density.
Dependencies are inferred from the claim text.