NOx monitor using differential mobility spectrometry

a technology of differential mobility and monitor, applied in the field of spectrometry, can solve the problems of complex system, low cost, difficult to interpret spectra output, etc., and achieve the effects of high sensitivity and specificity, low manufacturing cost, and fast response time (msec)

Inactive Publication Date: 2005-05-05
SIONEX
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Benefits of technology

[0018] The present invention achieves non-radioactive detection and identification of trace amounts of NOx species in a gas sample. In various embodiment of the invention, method and apparatus (i.e., systems) are provided for non-radioactive detection and qua

Problems solved by technology

Mass spectrometers are well known as the gold standard of laboratory-based systems operate at low pressures, resulting in complex systems, and the spectra output can be difficult to interpret, often requiring a highly trained operator.
But the GC-MS is not well-suited for small, low cost, fieldable instruments for real-time chemical detection.
These techniques, however, generally require sophisticated optical equipment, or suffer from significant drawbacks such as slow response times, or the detection o

Method used

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  • NOx monitor using differential mobility spectrometry
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  • NOx monitor using differential mobility spectrometry

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[0056] Ion energy considerations for photo-ionization and ion formation of NOx species in air at atmospheric pressure in practice of the invention are provided below.

[0057] First, an understanding of the ion energetics and ion chemistry is provided, as this is part of the understanding of operation of the preferred DMS method and apparatus of the invention and is a foundation for interpreting the resulting spectra.

[0058] As an illustration, FIG. 13 shows the typical chemical composition of an engine exhaust. Select ion energy properties of these components are: ionization energy (EI), electron (EA) and proton affinity (PA), and potential for ion formation via a UV ionization source with photon energy of 10.67 eV.

[0059] Analysis of the data from FIG. 13 shows that only NO, NO2, and propene species have an ionization energy lower than the photon energy (10.6 eV) provided by the UV ionization lamp used in this work. Consequently only these three components of the exhaust gas will di...

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Abstract

System for detection and analysis of gas samples in fieldable real-time Differential Mobility Spectrometry (DMS) chemical sensor system which uses non-radioactive ion source for monitoring and detecting NOx emissions; provides reliable methods for detecting and monitoring of anthropogenic sources of NOx; also detection of NO in exhaled breath for patient health diagnosis.

Description

RELATED APPLICATIONS [0001] This application claims priority to U.S. Provisional Application Ser. No. 60 / 418,235, filed Oct. 12, 2002, entitled FAIMS METHOD AND APPARATUS FOR NOX DETECTION AND ANALYSIS, by Raanan A. Miller, Erkinjon G. Nazarov, and Muning Zhong. The entire teachings of the above application are incorporated herein by reference.BACKGROUND OF THE INVENTION [0002] The present invention relates to spectrometry, and more particularly, to spectrometer devices providing chemical analysis by aspects of ion mobility in an electric field. [0003] Chemical detection systems are used in a wide array of applications. These devices may take samples directly from the environment, or may incorporate a front end device to separate compounds in a sample before detection. There is particular interest in providing a chemical detection system capable of accurate compound detection and identification, and which may be deployed in various venues, whether in the lab, in the workplace or in ...

Claims

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Application Information

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IPC IPC(8): G01N27/64G01N33/00
CPCG01N27/624Y10T436/177692G01N33/0037A61B5/082Y02A50/20
Inventor MILLER, RAANAN A.NAZAROV, ERKINJON G.ZHONG, MUNING
Owner SIONEX
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