Measuring and testing – Gas analysis – With compensation detail
Patent
1998-03-31
2000-05-16
Williams, Hezron
Measuring and testing
Gas analysis
With compensation detail
436118, G01N 2704
Patent
active
060620641
ABSTRACT:
An apparatus for sensing low concentration NOx in the atmosphere is disclosed. The apparatus has sensor elements arranged in a flow path of the atmosphere, the resistance of each of said sensor elements varying in response to changes in NOx concentration of the atmosphere; a catalyst arranged between said sensor elements to maintain partial pressures of NO and NO.sub.2 in the atmosphere at an equilibrium state; and measuring means for receiving signals from said sensor elements, one sensor element being contacted with the atmosphere which is not passed through said catalyst and the other sensor element being contacted with the atmosphere which is passed through said catalyst and for determining the concentrations of NO.sub.2 and NO in the atmosphere on the basis of said signals.
REFERENCES:
patent: 3949599 (1976-04-01), Kruishoop
patent: 4315753 (1982-02-01), Bruckenstein et al.
patent: 5705129 (1998-01-01), Takahashi et al.
Ogawa Naoyuki
Takahashi Tomonori
Yoshida Toshihiro
Cygan Michael
NGK Insulators Ltd.
Williams Hezron
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