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Nitrogen-oxygen sensor

A nitrogen and oxygen sensor, a sensitive technology, applied in the field of sensors, can solve the problems of limited application range, easy failure, poor selectivity, etc., and achieve the effect of simple manufacturing process, wide measurement range and fast response speed

Inactive Publication Date: 2012-07-25
HUAZHONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Semiconductor type sensors have relatively poor selectivity and stability for gases; concentration potential type has higher requirements for sealing; composite potential type sensors have complex structures and are prone to failure, and currently these sensors cannot measure NO and NO separately 2 gas, thus limiting its range of application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1-3

[0038] Examples 1-3 adopt figure 2 As shown in the structure, the material of base 1 is composed of 5moleY 2 O 3 The electrode 3 is made of CuO layer 7 and the cover layer 6 (the electric potential value E1 is curve D), the cover layer 6 is made of spinel material containing 5vol% Mn, and the electrode 4 is made of Pt. The resistance is made of Pt. The electrode 2 of Example 1 is made of NiO+15vol% YSZ (the potential value E2 is curve A), the electrode 2 of Example 2 is made of NiO+5vol% YSZ (the potential value E2 is curve B), and the electrode 2 of Example 3 is made of Made of NiO+30vol% YSZ (the potential value E2 is curve C).

[0039] image 3 For adoption figure 2 The sensor obtained by the device shown in Example 1, the NO obtained under the condition of different composition sensitive electrodes 2 The relationship between gas concentration and electrode potential.

[0040] Figure 4 For adoption figure 2 In the device shown, in Example 1, the NiO (+15wt% YSZ) electrode i...

example 4-6

[0044] The materials and components of each part in Examples 4-6 are shown in the following table

[0045] Matrix 1

[0046] The sensors obtained in Examples 4-6 can also achieve the technical effects of the present invention.

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Abstract

The invention discloses a nitrogen-oxygen sensor, which comprises a zirconium oxide substrate, two sensitive electrodes and a reference electrode, wherein the zirconium oxide substrate is made of yttrium-oxide-stabilized zirconium oxide, both the two sensitive electrodes are positioned on the zirconium oxide substrate and used for contacting with detected gas, one sensitive electrode is sensitive to NO (nitrogen monoxide) gas, the other sensitive electrode is sensitive to NO2 (nitrogen dioxide) gas, the reference electrode is positioned on the other side of the zirconium oxide substrate and used for contacting with air, and the two sensitive electrodes are respectively electrically connected with the reference electrode. The operating range of the nitrogen-oxygen sensor ranges from 350 DEG C to 800 DEG C, the concentration range of detected nitrogen oxides ranges from 5ppm to 3000ppm, and the response time can reach 1.2 seconds. The nitrogen-oxygen sensor is simple in structure and high in response speed and has the advantages of stable performance, simple manufacture process and wide measurement range.

Description

Technical field [0001] The invention belongs to sensor technology, in particular to a measuring sensor for nitrogen oxide gas, which is suitable for the measurement of automobile exhaust gas and nitrogen oxide gas in the metallurgical industry. Background technique [0002] Nitrogen oxide (NOx) refers to NO and NO 2 The mixed gas is one of the main harmful gases that produce acid rain and other acid deposits, which damage human health and the environment. With the continuous increase of automobiles, the emission of their exhaust gas increases the NOx gas content in the atmosphere. To control the nitrogen oxide content in the atmosphere, it is necessary to detect the nitrogen oxide content and monitor the nitrogen oxide emitted by automobiles. [0003] Nitrogen and oxygen sensors currently mainly include: semiconductor type, concentration potential type and composite potential type. The semiconductor sensor has relatively poor gas selectivity and stability; the concentration potent...

Claims

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Application Information

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IPC IPC(8): G01N27/30
Inventor 肖建中夏风覃剑修吉平熊建杰
Owner HUAZHONG UNIV OF SCI & TECH
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