FIELD PORTABLE CHEMICAL VAPOR SAMPLING

Brand	Owner	Address	Description
CHEMERA	Signature Science	8329 N. Mopac Expressway Austin TX 78759	Field portable chemical vapor sampling unit that is used as a chemical identification system to detect and alert users to chemical threats in the form of attacks and environmental chemical dangers comprised of an analyzer consisting of a mass spectrometer and automated alarms that utilize recorded machine learning software and a hand-held vapor collector with collection media, namely, sample traps for solid and liquid collection and adsorbents for vapor collection;
	Where the owner name is not linked, that owner no longer owns the brand

Technical Examples

An apparatus for measuring the effective vapor diffusion coefficient of a test vapor diffusing through a sample of porous media contained within a test chamber. A chemical sensor measures the time-varying concentration of vapor that has diffused a known distance through the porous media. A data processor contained within the apparatus compares the measured sensor data with analytical predictions of the response curve based on the transient diffusion equation using Fick's Law, iterating on the choice of an effective vapor diffusion coefficient until the difference between the predicted and measured curves is minimized. Optionally, a purge fluid can forced through the porous media, permitting the apparatus to also measure a gas-phase permeability. The apparatus can be made lightweight, self-powered, and portable for use in the field.