Cbrn International, Ltd.

Research International, Inc.

Dor Yacobi

Elric W Saaski

Systems, devices and methods, etc., that overcome one or more problems associated with high-speed monitoring of large numbers/volumes of postal articles of postal articles for dangerous materials and contaminants. Such monitoring can be more economic, practical, efficient and/or effective. The monitoring systems, methods, etc., herein provide positive pressure clean air passing through an interrogation zone in interrogation zone housing, through which suspect postal articles are pass to provide sampled air, which in turn is analyzed optically to detect dangerous materials such as illicit biologicals or chemicals and to identify the source envelope (or other postal article) to within a few envelopes.

Devices, systems and methods relating to high speed postal monitoring

A particle detector, having a housing defining a chamber; an air stream injector, producing an airstream in said chamber from air taken from outside said chamber; a light source, producing a light beam that crosses the air stream and wherein said light beam is shaped so that a transverse extent of said light beam has a uniform intensity over said transverse extent of said air stream. Also, a photon detection assembly, including an optical train of lenses, is positioned to accept light from said light beam, emitted by the particles, and to focus this light onto a photon detector. A particle detection assembly detects the particles, responsive to the photon detection assembly. Finally, a particle size estimation assembly estimates size for each detected particle, based on number of photons detected by said photon detection assembly from said particle, as it crosses said light beam.

Particle detector

A particle detector that includes a housing defining a chamber, and an air stream injector, producing an airstream with entrained particles, in the chamber. A light source produces a light beam that intersects with and is wider than the air stream. A light detection assembly detects light generated by scattering of the light beam, by particles in the air stream. A digitizer produces a sequence of scattering digital values, each representing light detected per a first unit of time duration. Additionally, a summing assembly produces a sequence of summed scattering digital values, each equaling a sum of a sequential set of n of the digital values, and wherein successive summed digital values are offset by a the first unit of time duration and overlap by n&#x2212;1 of the first units of time duration with a nearest neighbor. Finally, a detection assembly processes the summed scattering digital values to detect particles.

Bioaerosol particle detector

A method of detecting bioaerosols, including detecting particles and estimating a particle size for each detected particle and determining a fluorescence strength for each detected particle. Comparing particle size and fluorescence strength for each detected particle to arrive at a normalized fluorescence strength per particle and comparing normalized fluorescence strengths over a time period to a maximum threshold, to detect highly fluorescent manmade substances.

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Kenmore, WA, United States of America

Dor Yacobi