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):
-
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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 = {Tue Nov 29 00:00:00 EST 2005},
month = {Tue Nov 29 00:00:00 EST 2005}
}
Works referenced in this record:
Lactobacillus strains and uses therefor
patent-application, July 2004
- Rehberger, Thomas G.; Maxwell, Charles V.
- US Patent Application 10/624443; 20040126872
Works referencing / citing this record:
Dual polarity spark ion source
patent, April 2016
- Boumsellek, Said; Ivashin, Dmitriy V.
- US Patent Document 9,310,335