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Notice of retraction
Vol. 34, No. 8(3), S&M3042

Notice of retraction
Vol. 32, No. 8(2), S&M2292

Print: ISSN 0914-4935
Online: ISSN 2435-0869
Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
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Sensors and Materials, Volume 23, Number 3 (2011)
Copyright(C) MYU K.K.
pp. 147-158
S&M834 Research Paper
https://doi.org/10.18494/SAM.2011.681
Published: May 13, 2011

Nondispersive Infrared Ray CH4 Gas Sensor Using Focused Infrared Beam Structures [PDF]

JongSeon Park and SeungHwan Yi

(Received February 2, 2010; Accepted July 30, 2010)

Keywords: nondispersive infrared ray (NDIR) gas sensor, optical cavity, concave mirror structure, methane gas sensor, thermopile detector

We propose a concave optical cavity structure for use in a high-performance nondispersive infrared ray (NDIR) methane gas sensor module. By using a concave mirror structure, the maximum output voltage and voltage difference between 0 and 9,500 ppm increased by more than 160% compared with using a vertical mirror structure. The output voltage dependence of the thermopile location was tested in the case of a concave mirror structure. The output voltage increased from 2.75 to 3.63 V with the thermopile detector placed at distances of 2 and 3 mm from the reference position. It was found that the output voltage of the sensor decreased by more than 45% from 2.16 to 1.18 V after three years of operation in the case of the vertical mirror structure.

Corresponding author: SeungHwan Yi


Cite this article
JongSeon Park and SeungHwan Yi, Nondispersive Infrared Ray CH4 Gas Sensor Using Focused Infrared Beam Structures, Sens. Mater., Vol. 23, No. 3, 2011, p. 147-158.



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