Reflective gas cell structure for spectroscopic carbon dioxide sensor

This thesis describes an optical gas sensing system suitable for monitoring the presence of carbon dioxide (CO2). An optical gas sensor using low cost and compact mid-infrared components has been developed and tested. The emitter and detector are compact, inexpensive and have low power consumption w...

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Main Author:	Salim, Mohd. Rashidi
Format:	Thesis
Language:	English
Published:	2016
Subjects:	TK Electrical engineering Electronics Nuclear engineering
Online Access:	http://eprints.utm.my/id/eprint/78225/1/MohdRashidiSalimPFKE2016.pdf
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spelling	my-utm-ep.782252018-07-30T08:51:27Z Reflective gas cell structure for spectroscopic carbon dioxide sensor 2016-02 Salim, Mohd. Rashidi TK Electrical engineering. Electronics Nuclear engineering This thesis describes an optical gas sensing system suitable for monitoring the presence of carbon dioxide (CO2). An optical gas sensor using low cost and compact mid-infrared components has been developed and tested. The emitter and detector are compact, inexpensive and have low power consumption when compared with devices typically used in gas spectroscopy. Simulators such as ZEMAX®12 and SpectralCalc.com are primarily used in this work. Firstly, the research focuses on the simulation of the optimized and low cost gas cell for improvement using ZEMAX®12. Few gas cell structures have been designed and analyzed, which include Single-Input-Single-Output (SISO), 2-Multi-Input-Single-Output, 4-Multi- Input-Single-Output (4-MISO) and 8-Multi-Input-Single-Output. Of all these structures, SISO achieves the highest power efficiency of 28.028%. However, sensitivity analysis has shown that 4-MISO yields the highest sensitivity of - 0.2879%-1 and -0.2895%-1 for concentration range from 1.5% to 1.8% and from 1.1% to 2.0% respectively. Secondly, the optomechanical design of optimized 4-MISO was analyzed and fabricated using low cost and robust material. Experimental works were then carried out and the sensor’s output was acquired and recorded using Data Acquisition card and LabVIEW programme. Experimental results show that the new developed 4-MISO sensor has similar sensitivity to simulated gas sensor for detecting carbon dioxide gas concentration range from 1.5% to 1.8% with overall sensitivity of -0.2916%-1. However, the deviation of sensitivity between the measured and simulated range of concentration was calculated at 0.0037%-1. Finally, the developed low cost sensor has shown the capability of detecting CO2 gas concentration with high accuracy of 0.6357% and response time of less than 1 second. The optimized gas sensor can be applied in various potential applications such as in monitoring indoor air quality, automotive, horticulture and heating, ventilating and air conditioning systems. 2016-02 Thesis http://eprints.utm.my/id/eprint/78225/ http://eprints.utm.my/id/eprint/78225/1/MohdRashidiSalimPFKE2016.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:97420 phd doctoral Universiti Teknologi Malaysia, Faculty of Electrical Engineering Faculty of Electrical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TK Electrical engineering Electronics Nuclear engineering
spellingShingle	TK Electrical engineering Electronics Nuclear engineering Salim, Mohd. Rashidi Reflective gas cell structure for spectroscopic carbon dioxide sensor
description	This thesis describes an optical gas sensing system suitable for monitoring the presence of carbon dioxide (CO2). An optical gas sensor using low cost and compact mid-infrared components has been developed and tested. The emitter and detector are compact, inexpensive and have low power consumption when compared with devices typically used in gas spectroscopy. Simulators such as ZEMAX®12 and SpectralCalc.com are primarily used in this work. Firstly, the research focuses on the simulation of the optimized and low cost gas cell for improvement using ZEMAX®12. Few gas cell structures have been designed and analyzed, which include Single-Input-Single-Output (SISO), 2-Multi-Input-Single-Output, 4-Multi- Input-Single-Output (4-MISO) and 8-Multi-Input-Single-Output. Of all these structures, SISO achieves the highest power efficiency of 28.028%. However, sensitivity analysis has shown that 4-MISO yields the highest sensitivity of - 0.2879%-1 and -0.2895%-1 for concentration range from 1.5% to 1.8% and from 1.1% to 2.0% respectively. Secondly, the optomechanical design of optimized 4-MISO was analyzed and fabricated using low cost and robust material. Experimental works were then carried out and the sensor’s output was acquired and recorded using Data Acquisition card and LabVIEW programme. Experimental results show that the new developed 4-MISO sensor has similar sensitivity to simulated gas sensor for detecting carbon dioxide gas concentration range from 1.5% to 1.8% with overall sensitivity of -0.2916%-1. However, the deviation of sensitivity between the measured and simulated range of concentration was calculated at 0.0037%-1. Finally, the developed low cost sensor has shown the capability of detecting CO2 gas concentration with high accuracy of 0.6357% and response time of less than 1 second. The optimized gas sensor can be applied in various potential applications such as in monitoring indoor air quality, automotive, horticulture and heating, ventilating and air conditioning systems.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Salim, Mohd. Rashidi
author_facet	Salim, Mohd. Rashidi
author_sort	Salim, Mohd. Rashidi
title	Reflective gas cell structure for spectroscopic carbon dioxide sensor
title_short	Reflective gas cell structure for spectroscopic carbon dioxide sensor
title_full	Reflective gas cell structure for spectroscopic carbon dioxide sensor
title_fullStr	Reflective gas cell structure for spectroscopic carbon dioxide sensor
title_full_unstemmed	Reflective gas cell structure for spectroscopic carbon dioxide sensor
title_sort	reflective gas cell structure for spectroscopic carbon dioxide sensor
granting_institution	Universiti Teknologi Malaysia, Faculty of Electrical Engineering
granting_department	Faculty of Electrical Engineering
publishDate	2016
url	http://eprints.utm.my/id/eprint/78225/1/MohdRashidiSalimPFKE2016.pdf
_version_	1747817937669980160

Reflective gas cell structure for spectroscopic carbon dioxide sensor

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