Trace chemical sensing

Details Trace chemical sensing Trace chemical sensing

2007-01-17

2009-08-18

Noland, Thomas P (Department: 2856)

Measuring and testing

Sampler, sample handling, etc.

Capture device

C073S863210, C073S863230

Reexamination Certificate

active

07574930

ABSTRACT:
An explosive and narcotics detection system detects the presence of trace particles of materials that are adhering to surfaces. In order to detect such particles, to the particles are first dislodged or released from the surface, then transported to the detection instrument, and then accumulated on or in a particle collection device. When the sample collecting system and the target surface are in relative motion across the line-of-sight greater than fifteen centimeters per second, non-contact sample collection may be accomplished using a vortex or vortex attractor particle collector together with a plurality of air or aerosol jets. A plurality of large diameter vortex collectors may obtain samples at relative line-of-sight velocities greater than five feet per second over a large surface area and for a complex-shaped surface.

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