Chemistry: analytical and immunological testing – Phosphorus containing
Patent
1994-09-20
1996-04-23
Alexander, Lyle A.
Chemistry: analytical and immunological testing
Phosphorus containing
436104, 422 8201, G01N 2766
Patent
active
055102689
ABSTRACT:
The invention relates to a method and an apparatus for individually detecting in ambient air a predetermined gaseous warfare agent, namely a poison gas of the class of organic sulfuric or phosphorous substances, and a predetermined interfering compound, e.g. another poison gas. First, light O.sub.2 reaction ions are generated from water and are added in a measuring chamber to a mixture of the agent and the ambient air. As a result, the O.sub.2 reaction ions will deposit on the heavy molecules of the agent in a spatially non-uniform distribution to generate quasi-molecular ions. An electrical field alternating about a zero line and having a predetermined basic frequency and an amplitude is generated within the measuring chamber. The resulting quasi-molecular ion current is measured and resulting current signals are processed. For distinguishing the agent from the interfering compound, an initial experiment is made for a standardized measuring chamber. During the initial experiment, the quasi-molecular current is determined as a function of the basic frequency, of the amplitude and of a plurality of asymmetries of the electrical field variation relative to the zero line. Each current determination is carried out separately for the agent and for the interfering compound. Then a first measurement on the mixture of ambient air, agent and interfering compound is made with a first one of the asymmetries and, subsequently, a second measurement on the mixture is made with a second one of the asymmetries. The measured signals of these two measurements are logically combined to extract an output signal indicative of the presence of the agent and of the interfering compound within the ambient air.
REFERENCES:
Article "Detection of Chemical Warfare Agents by Means of an Ionization Chamber Operated in AC Mode" by S. Milinkovic et al. in "Proc. 3rd Int. Symp. Protection Against Chemical Warfare Agents" in Umea, Sweden, Jun. 11-16, 1989.
Periodical "Isotopenpraxis," vol. 26, No. 4, pp. 176-180 (1990), "The Self-Consistent Charge Method: A Numerical Approach to Radiation-Induced Charge Transport Phenomena" by E. Hartmann et al.
Article "New Ion Mobility Techniques" by C. Blanchard, in "Proceedings of the 1987 U.S. Army Scientific Conference on Chemical Defense Research" Aberdeen Proving Ground, MD, CRDBC-Sp-88013, 1971 (Apr. 1988).
Doring Hans-Rudiger
Hartmann Eberhard
Alexander Lyle A.
Hamrick Claude A. S.
LandOfFree
Method and device for detecting substances in an ambient substan does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and device for detecting substances in an ambient substan, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and device for detecting substances in an ambient substan will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2307867