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A resistance-type nitrogen dioxide gas sensor, and an apparatus manufactured with the sensor

A gas sensor and nitrogen dioxide technology, applied in the direction of material resistance, can solve the problems of inability to achieve accurate measurement, and achieve the effects of simple structure, good gas selectivity, and fast response time

Inactive Publication Date: 2011-11-16
刘震国
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, some domestic nitrogen dioxide gas detection equipment cannot achieve accurate measurement of this low concentration value.

Method used

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  • A resistance-type nitrogen dioxide gas sensor, and an apparatus manufactured with the sensor
  • A resistance-type nitrogen dioxide gas sensor, and an apparatus manufactured with the sensor
  • A resistance-type nitrogen dioxide gas sensor, and an apparatus manufactured with the sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0035] Embodiment: The above-mentioned measuring instrument is exposed to the target gas to be measured, and a resistance value corresponding to the concentration of the target gas reacted by the resistive nitrogen dioxide gas sensor is measured.

[0036] When in use, the gas-sensitive material layer 11 of the resistive nitrogen dioxide gas sensor is first heated to the set working temperature, where the working temperature range is 400°C±20°C; the method for heating the gas-sensitive material layer 11 to the working temperature The two ends of the platinum heating resistor 14 are connected with a pulse voltage with adjustable width and cycle length. see Figure 4 The installation schematic diagram of the resistive nitrogen dioxide gas sensor is shown, and the wiring pin a is connected to the heating control circuit. Due to technological reasons, the resistance value of the platinum heating resistor 14 printed on the lower surface of the aluminum oxide plane dielectric base l...

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Abstract

The invention discloses a resistance-type nitrogen dioxide gas sensor, and an apparatus manufactured with the sensor. The sensor comprises a gas-sensitive material layer with tungsten oxide as a main gas-sensitive material, and gold conductive electrode plates arranged with an interdigitated structure, wherein the gold conductive electrode plates contact the gas-sensitive material layer. The conductive electrode plates are printed on an alumina planar medium substrate. The back side of the medium substrate is provided with a platinum heating resistor. The sensor is arranged on a pedestal with a small hole. A cap with a ventilating central hole is covered on the pedestal. Platinum conductors are respectively led out from the platinum heating resistor and the interdigitated gold conductive electrodes. The conductors led out from the platinum heating resistor are connected with a heating controlling circuit, and the conductors led out from the interdigitated gold conductive electrodes are connected with a resistance calculating circuit. The apparatus provided by the invention has a simple structure, and employs a novel gas-sensitive material. With the apparatus, an accuracy of nitrogen dioxide volume concentration detection can be improved to a PPB (parts per billion) grade. The apparatus has advantages of good gas selectivity and short reaction time.

Description

technical field [0001] The invention relates to a semiconductor type resistive nitrogen dioxide gas sensor, a resistive nitrogen dioxide gas sensor instrument and a temperature control method for the resistive nitrogen dioxide gas sensor instrument. Background technique [0002] At present, the concentration measurement of nitrogen dioxide gas is widely concerned, and scholars at home and abroad have done a lot of research in this area. Some research results have been transformed into commercial applications. But generally speaking, the selectivity, sensitivity, and consistency of the sensors used in the measurement of nitrogen dioxide gas are not ideal. The phenomenon of cross selection is serious and the precision is low. [0003] As a toxic gas, nitrogen dioxide exists in large quantities in industrial waste gas and automobile exhaust. According to "Environmental Protection Law of the People's Republic of China" and "Law of the People's Republic of China on Air Polluti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/04
Inventor 刘震国
Owner 刘震国
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