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Title: Ion-mobility spectrometry sensor for NOx detection

Abstract

A sensor and detection methods are provided for detecting nitric oxides (NOx) in an exhaust gas based upon ion mobility spectrometry (IMS) technique. An ionization chamber having an interior electrically conductive shell receives exhaust gas. A spark electrode having a needle tip extends into the ionization chamber. A shutter grid is coupled between the ionization chamber and an ion drift tube. A substantially continuous spark discharge is established between the electrically conductive shell and the needle tip of the spark electrode for ionization of the exhaust gas. Negative NO2 ions are kept inside the chamber by biasing the electrically conductive shell and the shutter grid at a negative voltage. Then a positive pulse is applied to the shutter grid to cause the shutter to open for negative NO2 ions to exit into the ion drift tube. The IMS sensor is small-sized, low-cost, robust, and reliable.

Inventors:
; ;
Issue Date:
Research Org.:
Univ. of Chicago, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1531498
Patent Number(s):
6969851
Application Number:
10/920,539
Assignee:
The University of Chicago (Chicago, IL)
Patent Classifications (CPCs):
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC Y10T - TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01J - ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
DOE Contract Number:  
W-31-109-ENG-38
Resource Type:
Patent
Resource Relation:
Patent File Date: 2004-08-18
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

Sheen, Shuh-Haw, Raptis, Apostolos C., and Chien, Hual-Te. Ion-mobility spectrometry sensor for NOx detection. United States: N. p., 2005. Web.
Sheen, Shuh-Haw, Raptis, Apostolos C., & Chien, Hual-Te. Ion-mobility spectrometry sensor for NOx detection. United States.
Sheen, Shuh-Haw, Raptis, Apostolos C., and Chien, Hual-Te. Tue . "Ion-mobility spectrometry sensor for NOx detection". United States. https://www.osti.gov/servlets/purl/1531498.
@article{osti_1531498,
title = {Ion-mobility spectrometry sensor for NOx detection},
author = {Sheen, Shuh-Haw and Raptis, Apostolos C. and Chien, Hual-Te},
abstractNote = {A sensor and detection methods are provided for detecting nitric oxides (NOx) in an exhaust gas based upon ion mobility spectrometry (IMS) technique. An ionization chamber having an interior electrically conductive shell receives exhaust gas. A spark electrode having a needle tip extends into the ionization chamber. A shutter grid is coupled between the ionization chamber and an ion drift tube. A substantially continuous spark discharge is established between the electrically conductive shell and the needle tip of the spark electrode for ionization of the exhaust gas. Negative NO2 ions are kept inside the chamber by biasing the electrically conductive shell and the shutter grid at a negative voltage. Then a positive pulse is applied to the shutter grid to cause the shutter to open for negative NO2 ions to exit into the ion drift tube. The IMS sensor is small-sized, low-cost, robust, and reliable.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2005},
month = {11}
}

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