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Sensors 2018, 18(9), 2911; https://doi.org/10.3390/s18092911

Characteristics and Temperature Compensation of Non-Dispersive Infrared (NDIR) Alcohol Gas Sensors According to Incident Light Intensity

1
Department of Control & Instrumentation Engineering, Korea National University of Transportation (KNUT), 50 Daehakro, Chungjushi, Chungbuk 27469, Korea
2
Department of Mechanical Engineering, Korea National University of Transportation (KNUT), 50 Daehakro, Chungjushi, Chungbuk 27469, Korea
*
Author to whom correspondence should be addressed.
Received: 3 August 2018 / Revised: 24 August 2018 / Accepted: 29 August 2018 / Published: 1 September 2018
(This article belongs to the Special Issue Functional Materials for the Applications of Advanced Gas Sensors)
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Abstract

This paper discusses the output characteristics of the sensor response of infrared ethanol gas detectors based on incident radiation intensity. Sensors placed at each focal point of two elliptical waveguides were fabricated to yield two module combinations and to verify the output characteristics. A thin Parylene-C film was deposited onto the reflector surfaces of one module. The thermal properties were compared between the sensor (2.0 Ø) and sensor with a hollow disk (1.6 Ø), the disk being mounted at the end of one detector. The fabricated sensor modules were placed inside a gas chamber. The temperature was increased from 253 K to 333 K, over the concentration range from 0 to 500 ppm. As the temperature increases by 10 K, the output of sensor (2.0 Ø) without and with Parylene-C coating typically increased by 70 mV and 52 mV, respectively. However, the sensor output with the hollow disk showed an average decrement of 0.8 mV/50 ppm and 1 mV/50 ppm for module without and with Parylene-C deposition, respectively. For concentrations higher than 50 ppm, the estimation error was around ±5%. Further, the sensitivity to temperature variation and the absorbance of infrared (IR) reflection was found higher for Parylene-C coated module. View Full-Text
Keywords: ethanol gas; Non-Dispersive Infrared (NDIR); optical waveguide; dual-elliptical structure; temperature compensation ethanol gas; Non-Dispersive Infrared (NDIR); optical waveguide; dual-elliptical structure; temperature compensation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Hussain, H.; Kim, J.; Yi, S. Characteristics and Temperature Compensation of Non-Dispersive Infrared (NDIR) Alcohol Gas Sensors According to Incident Light Intensity. Sensors 2018, 18, 2911.

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