Patent ID: 6330519
Filing Date: 2001-12-11
Classification: B60Q

Abstract:
An apparatus comprising:a sensor enclosure having a plurality of walls defining a first optical port having a first opening and a second optical port having a second opening, said enclosure further including an exit opening;a deflector having first and second apertures;a light source disposed in said first optical port, said light source being configured to emit a light beam through said first aperture and said first opening to illuminate a sample volume located outside of said apparatus;a light detector disposed in said second optical port and configured to detect light through said second aperture and said second opening and generate an output signal in response thereto indicative of the amount of light scattered from particles in the sample volume;said first and second openings being located on a first side of said deflector, said light source and said light detector being located a second side opposite said first side of said deflector; andwherein said enclosure is configured to allow air to flow therethrough entering said first and second openings and exiting said exit opening such that the air flow occurs substantially on said first side of said deflector.