Optical gas sensing: a review

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Mid-infrared integrated photonics on silicon: a perspective (2017, background): “Such an impressive NEA, while quoted in previous on-chip sensor performance projections [214], is challenging to attain in practice [215].”
Quartz-Enhanced Photoacoustic Spectroscopy: A Review (2014, methodology): “In Figure 19 we compared the performance of several gas detection techniques in terms of NNEA versus optical pathlength [98,99].”
Non-dispersive infra-red (NDIR) measurement of carbon dioxide at 4.2μm in a compact and optically efficient sensor (2013, background): “These sensors are low cost, having few components (typically a simple microbulb light source, gold coated reflective light path and detector) [5].”