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 | |
| Publication status | Published - 2014 Jan 1 |
| Event | 13th IEEE SENSORS Conference, SENSORS 2014 - Valencia, Spain Duration: 2014 Nov 2 → 2014 Nov 5 |
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All Science Journal Classification (ASJC) codes
- Electrical and Electronic Engineering
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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, 01.01.2014, p. 1819-1822.Research output: Contribution to journal › Conference article
TY - JOUR
T1 - A reflection type gas sensor using conducting polymer as a variable impedance at microwave frquencies
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
PY - 2014/1/1
Y1 - 2014/1/1
N2 - 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.
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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U2 - 10.1109/ICSENS.2014.6985380
DO - 10.1109/ICSENS.2014.6985380
M3 - Conference article
VL - 2014-December
SP - 1819
EP - 1822
JO - Proceedings of IEEE Sensors
JF - Proceedings of IEEE Sensors
SN - 1930-0395
IS - December
M1 - 6985380
ER -