Air curtain device
First Claim
1. An air curtain device for use in detecting selected vapours emitted from objects positioned therein, said device comprising first and second spaced apart cabinets, a vertical wall of said first cabinet provided with an air discharge grill, a vertical wall of said second cabinet provided with a corresponding and complementary air intake grill, said air discharge grill being directly opposite to said air intake grill, air intake means on said first cabinet upstream of said air discharge grill, air exhaust means in said second cabinet downstream of said air intake grill, said air intake and air discharge means being synchronized to provide a substantially uniform horizontal flow of air from the first cabinet to the second cabinet, and vapour detection means located intermediate said air intake grill and said air exhaust means.
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Abstract
This invention relates to a novel air curtain device suitable for use in detecting certain characteristic vapors emitted from objects, particularly individuals, positioned therein. An air curtain having a uniform velocity profile is set up between first and second cabinets. Vapor detector probes are positioned in one cabinet downstream of the air curtain. Detectable vapors carried by an object, such as a person within the air curtain, are stripped off and transported to the vapor detectors. By positioning the vapor detectors remote from the object, a significantly higher number of objects can be screened using known vapor detection techniques within a given period of time.
64 Citations
9 Claims
- 1. An air curtain device for use in detecting selected vapours emitted from objects positioned therein, said device comprising first and second spaced apart cabinets, a vertical wall of said first cabinet provided with an air discharge grill, a vertical wall of said second cabinet provided with a corresponding and complementary air intake grill, said air discharge grill being directly opposite to said air intake grill, air intake means on said first cabinet upstream of said air discharge grill, air exhaust means in said second cabinet downstream of said air intake grill, said air intake and air discharge means being synchronized to provide a substantially uniform horizontal flow of air from the first cabinet to the second cabinet, and vapour detection means located intermediate said air intake grill and said air exhaust means.
Specification