Apparatus for sensing low concentration NOx
First Claim
1. An apparatus for sensing low concentration NOx in the atmosphere, comprising;
- 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 to maintain partial pressures of NO and NO2 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 contacted with said catalyst and the other sensor element being contacted with the atmosphere which is contacted with said catalyst and for determining the concentrations of NO2 and NO in the atmosphere on the basis of said signals.
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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 NO2 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 NO2 and NO in the atmosphere on the basis of said signals.
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Citations
15 Claims
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1. An apparatus for sensing low concentration NOx in the atmosphere, comprising;
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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 to maintain partial pressures of NO and NO2 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 contacted with said catalyst and the other sensor element being contacted with the atmosphere which is contacted with said catalyst and for determining the concentrations of NO2 and NO in the atmosphere on the basis of said signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification