Wang, P. et al. (2018) Optimised performance of non-dispersive infrared gas sensors using multilayer thin film bandpass filters. Coatings, 8(12), 472. (doi: 10.3390/coatings8120472)
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Abstract
In this work, performance improvements are described for a low-power consumption non-dispersive infrared (NDIR) methane (CH4) gas sensor using customised optical thin film bandpass filters (BPFs) centered at 3300 nm. BPFs shape the spectral characteristics of the combined mid-infrared III–V based light emitting diode (LED)/photodiode (PD) light source/detector optopair, enhancing the NDIR CH4 sensor performance. The BPFs, deposited using a novel microwave plasma-assisted pulsed DC sputter deposition process, provide room temperature deposition directly onto the temperature-sensitive PD heterostructure. BPFs comprise germanium (Ge) and niobium pentoxide (Nb2O5) alternating high and low refractive index layers, respectively. Two different optical filter designs are progressed with BPF bandwidths (BWs) of 160 and 300 nm. A comparison of the modelled and measured NDIR sensor performance is described, highlighting the maximised signal-to-noise ratio (SNR) and the minimised cross-talk performance benefits. The BPF spectral stability for various environmental temperature and humidity conditions is demonstrated.
| Item Type: | Articles |
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| Additional Information: | This research received funding from ERANET Horizon 2020 PhotonicSensing Transnational project (File Ref: 620130, ERA-NET Ref: CSMIS). This work was supported in part by a joint funded grant from Scottish Enterprise and CENSIS under the MIRAGE programme. The work was also funded from a University of the West of Scotland masters project. |
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Steer, Dr Matthew |
| Authors: | Wang, P., Fu, X., Gibson, D., Fleming, L., Ahmadzadeh, S., Li, C., Muhiyudin, M., Song, S., Hutson, D., Moodie, D., MacGregor, C., and Steer, M. |
| College/School: | College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering |
| Journal Name: | Coatings |
| Publisher: | MDPI |
| ISSN: | 2079-6412 |
| ISSN (Online): | 2079-6412 |
| Published Online: | 19 December 2018 |
| Copyright Holders: | Copyright © 2018 The Authors |
| First Published: | First published in Coatings 8(12): 472 |
| Publisher Policy: | Reproduced under a Creative Commons License |
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