A Reflection Type Gas Sensor Using Conducting Polymer as A Variable Impedance at Microwave Frquencies

被引：0

作者：

Lee, Yong-Joo ^{[1
]}

Kim, Byung-Hyun ^{[1
]}

Lee, Hee-Jo ^{[1
]}

Hong, Yunseog ^{[1
]}

Yook, Jong-Gwan ^{[1
]}

Choi, Hyang Hee ^{[2
]}

Lee, Seung Hwan ^{[2
]}

Lee, Jung Joon ^{[2
]}

机构：

[1] Yonsei Univ, Dept Elect & Elect Engn, Seoul, South Korea

[2] Yonsei Univ, Dept Chem & Biomol Engn, Seoul, South Korea

来源：

2014 IEEE SENSORS | 2014年

基金：

新加坡国家研究基金会;

关键词：

Conducting polymer; microwave sensor; gas sensor; reflection type variable attenuator; S-parameters;

D O I：

暂无

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

In this paper, a gas sensor using a reflection type variable attenuator structure with conducting polymer (CP) is represented. A common gas sensing mechanism is to measure the conductivity or resistance of the CPs when it is exposed to gas. Because conductivity of the CPs varies due to the gas. A novelty in this paper is that the proposed sensor has employed the CPs as impedance-variable transmission lines that cause the impedance mismatching with conventional hybrid coupler. This structure can be thought as a variable attenuator or phase shifter. Experiment is conducted with 100 ppm ethanol gas at a temperature of 28 degrees C and relative humidity of 80% (humidity condition). As a result the amplitude of S-11 and the frequency satisfying angle S-21 = -360 degrees is shifted about 2.875 MHz. It is that this reflection type sensor represented.

引用

页码：1819 / 1822

页数：4

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