A reflection type gas sensor using conducting polymer as a variable impedance at microwave frquencies

Yong Joo Lee; Byung Hyun Kim; Hee Jo Lee; Yunseog Hong; Jong Gwan Yook; Hyang Hee Choi; Seung Hwan Lee; Jung Joon Lee

doi:10.1109/ICSENS.2014.6985380

A reflection type gas sensor using conducting polymer as a variable impedance at microwave frquencies

Yong Joo Lee, Byung Hyun Kim, Hee Jo Lee, Yunseog Hong, Jong Gwan Yook, Hyang Hee Choi, Seung Hwan Lee, Jung Joon Lee

Department of Electrical and Electronic Engineering

Research output: Contribution to journal › Conference article › peer-review

8 Citations (Scopus)

Abstract

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°C and relative humidity of 80% (humidity condition). As a result the amplitude of S₁₁ and the frequency satisfying ∠S₂₁ = -360° is shifted about 2.875 MHz. It is that this reflection type sensor represented.

Original language	English
Article number	6985380
Pages (from-to)	1819-1822
Number of pages	4
Journal	Proceedings of IEEE Sensors
Volume	2014-December
Issue number	December
DOIs	https://doi.org/10.1109/ICSENS.2014.6985380
Publication status	Published - 2014 Dec 12
Event	13th IEEE SENSORS Conference, SENSORS 2014 - Valencia, Spain Duration: 2014 Nov 2 → 2014 Nov 5

All Science Journal Classification (ASJC) codes

Electrical and Electronic Engineering

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10.1109/ICSENS.2014.6985380

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title = "A reflection type gas sensor using conducting polymer as a variable impedance at microwave frquencies",

abstract = "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°C and relative humidity of 80% (humidity condition). As a result the amplitude of S11 and the frequency satisfying ∠S21 = -360° is shifted about 2.875 MHz. It is that this reflection type sensor represented.",

author = "Lee, {Yong Joo} and Kim, {Byung Hyun} and Lee, {Hee Jo} and Yunseog Hong and Yook, {Jong Gwan} and Choi, {Hyang Hee} and Lee, {Seung Hwan} and Lee, {Jung Joon}",

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year = "2014",

month = dec,

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doi = "10.1109/ICSENS.2014.6985380",

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A reflection type gas sensor using conducting polymer as a variable impedance at microwave frquencies. / Lee, Yong Joo; Kim, Byung Hyun; Lee, Hee Jo; Hong, Yunseog; Yook, Jong Gwan; Choi, Hyang Hee; Lee, Seung Hwan; Lee, Jung Joon.

In: Proceedings of IEEE Sensors, Vol. 2014-December, No. December, 6985380, 12.12.2014, p. 1819-1822.

Research output: Contribution to journal › Conference article › peer-review

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AU - Lee, Yong Joo

AU - Kim, Byung Hyun

AU - Lee, Hee Jo

AU - Hong, Yunseog

AU - Yook, Jong Gwan

AU - Choi, Hyang Hee

AU - Lee, Seung Hwan

AU - Lee, Jung Joon

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AB - 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°C and relative humidity of 80% (humidity condition). As a result the amplitude of S11 and the frequency satisfying ∠S21 = -360° is shifted about 2.875 MHz. It is that this reflection type sensor represented.

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