Real-time imaging of methane gas leaks using a single-pixel camera

Gibson, G. M. , Sun, B., Edgar, M. P., Phillips, D. B., Hempler, N., Maker, G. T., Malcolm, G. P.A. and Padgett, M. (2017) Real-time imaging of methane gas leaks using a single-pixel camera. Optics Express, 25(4), pp. 2998-3005. (doi: 10.1364/OE.25.002998)

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We demonstrate a camera which can image methane gas at video rates, using only a single-pixel detector and structured illumination. The light source is an infrared laser diode operating at 1.651μm tuned to an absorption line of methane gas. The light is structured using an addressable micromirror array to pattern the laser output with a sequence of Hadamard masks. The resulting backscattered light is recorded using a single-pixel InGaAs detector which provides a measure of the correlation between the projected patterns and the gas distribution in the scene. Knowledge of this correlation and the patterns allows an image to be reconstructed of the gas in the scene. For the application of locating gas leaks the frame rate of the camera is of primary importance, which in this case is inversely proportional to the square of the linear resolution. Here we demonstrate gas imaging at ~25 fps while using 256 mask patterns (corresponding to an image resolution of 16×16). To aid the task of locating the source of the gas emission, we overlay an upsampled and smoothed image of the low-resolution gas image onto a high-resolution color image of the scene, recorded using a standard CMOS camera. We demonstrate for an illumination of only 5mW across the field-of-view imaging of a methane gas leak of ~0.2 litres/minute from a distance of ~1 metre.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Edgar, Dr Matthew and Gibson, Dr Graham and Sun, Mr Baoqing and Padgett, Professor Miles
Authors: Gibson, G. M., Sun, B., Edgar, M. P., Phillips, D. B., Hempler, N., Maker, G. T., Malcolm, G. P.A., and Padgett, M.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Optics Express
Publisher:Optical Society of America
ISSN (Online):1094-4087
Published Online:06 February 2017
Copyright Holders:Copyright © 2017 The Authors
First Published:First published in Optics Express 25(4):2998-3005
Publisher Policy:Reproduced under a Creative Commons License
Data DOI:10.5525/gla.researchdata.375

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
6672319UK Quantum Technology Hub in Enhanced Quantum ImagingMiles PadgettEngineering & Physical Sciences Research Council (EPSRC)EP/M01326X/1S&E P&A - PHYSICS & ASTRONOMY