Rockett Thomas B O, Boone Nicholas A, Richards Robert D, Willmott Jon R
Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield S10 2TN, UK.
Sensors (Basel). 2021 Sep 13;21(18):6151. doi: 10.3390/s21186151.
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.
在场景中测量宽温度范围需要具备高动态范围成像能力的硬件。我们描述了一种基于商用光伏模式高动态范围相机、工作波长为940 nm的新型近红外热成像系统，并分析了其测量不确定度。该系统能够在前所未有的宽温度范围内进行测量；然而，与工作在光探测模式的传统CMOS相机相比，这是以降低温度分辨率和增加不确定度为代价的。尽管如此，对于大多数热成像应用来说，光伏模式热相机的不确定度水平是可以接受的，其噪声等效温差为4-12°C，如果使用低像素时钟，组合测量不确定度约为1%K。我们讨论了不确定度的各种来源以及如何将它们最小化以进一步提高热相机的性能。热相机是对具有宽场景间温度范围的低帧率应用进行成像的一个不错选择。
