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Authors = Nicholas A. Boone ORCID = 0000-0002-5251-0104

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16 pages, 5169 KiB  
Article
Thermal Imaging Metrology Using High Dynamic Range Near-Infrared Photovoltaic-Mode Camera
by Thomas B. O. Rockett, Nicholas A. Boone, Robert D. Richards and Jon R. Willmott
Sensors 2021, 21(18), 6151; https://doi.org/10.3390/s21186151 - 13 Sep 2021
Cited by 7 | Viewed by 3906
Abstract
The measurement of a wide temperature range in a scene requires hardware capable of high dynamic range imaging. We describe a novel near-infrared thermal imaging system operating at a wavelength of 940 nm based on a commercial photovoltaic mode high dynamic range camera [...] Read more.
The measurement of a wide temperature range in a scene requires hardware capable of high dynamic range imaging. We describe a novel near-infrared thermal imaging system operating at a wavelength of 940 nm based on a commercial photovoltaic mode high dynamic range camera and analyse its measurement uncertainty. The system is capable of measuring over an unprecedently wide temperature range; however, this comes at the cost of a reduced temperature resolution and increased uncertainty compared to a conventional CMOS camera operating in photodetective mode. Despite this, the photovoltaic mode thermal camera has an acceptable level of uncertainty for most thermal imaging applications with an NETD of 4–12 °C and a combined measurement uncertainty of approximately 1% K if a low pixel clock is used. We discuss the various sources of uncertainty and how they might be minimised to further improve the performance of the thermal camera. The thermal camera is a good choice for imaging low frame rate applications that have a wide inter-scene temperature range. Full article
(This article belongs to the Section Sensing and Imaging)
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13 pages, 7969 KiB  
Article
Low-Cost Hyperspectral Imaging with A Smartphone
by Mary B. Stuart, Andrew J. S. McGonigle, Matthew Davies, Matthew J. Hobbs, Nicholas A. Boone, Leigh R. Stanger, Chengxi Zhu, Tom D. Pering and Jon R. Willmott
J. Imaging 2021, 7(8), 136; https://doi.org/10.3390/jimaging7080136 - 5 Aug 2021
Cited by 32 | Viewed by 10496
Abstract
Recent advances in smartphone technologies have opened the door to the development of accessible, highly portable sensing tools capable of accurate and reliable data collection in a range of environmental settings. In this article, we introduce a low-cost smartphone-based hyperspectral imaging system that [...] Read more.
Recent advances in smartphone technologies have opened the door to the development of accessible, highly portable sensing tools capable of accurate and reliable data collection in a range of environmental settings. In this article, we introduce a low-cost smartphone-based hyperspectral imaging system that can convert a standard smartphone camera into a visible wavelength hyperspectral sensor for ca. £100. To the best of our knowledge, this represents the first smartphone capable of hyperspectral data collection without the need for extensive post processing. The Hyperspectral Smartphone’s abilities are tested in a variety of environmental applications and its capabilities directly compared to the laboratory-based analogue from our previous research, as well as the wider existing literature. The Hyperspectral Smartphone is capable of accurate, laboratory- and field-based hyperspectral data collection, demonstrating the significant promise of both this device and smartphone-based hyperspectral imaging as a whole. Full article
(This article belongs to the Special Issue Hyperspectral Imaging and Its Applications)
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