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In-situ calibration of a microbolometer camera for the study of large-scale fires

机译：用于研究大火的微测辐射热计相机的现场校准

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Quantitative temperature measurements of large-scale fires are of key interest to FM Global's researchers and engineers. In this study, the effectiveness of extending an uncooled fixed-integration-time IR camera's temperature range via a reduced aperture was investigated. The corresponding calibration of the focal plane array (FPA) was performed, in situ, by investigating spatially resolved radiance levels with and without the aperture present. In-the-field calibration results were compared and validated using a blackbody (ε = 1) source. The effect of reduced radiant intensity on the noise equivalent temperature difference (NETD) was investigated over a wide temperature range. This study shows the effective temperature extension of a fixed-integration-time (microbolometer) IR camera from 1200℉ (650℃) to 2192℉ (1200℃), making this camera particularly suitable for studying fires. The temperature extension was accomplished at low cost without changing the integration time of the focal plane array (FPA), removing the camera's lens, or by using a neutral density (ND) filter.
机译：大规模火灾的温度定量测量是FM Global的研究人员和工程师的主要兴趣所在。在这项研究中，研究了通过减小​​光圈来扩展非制冷固定积分时间红外摄像机的温度范围的有效性。通过研究存在和不存在光圈的空间分辨辐射水平，就地进行了焦平面阵列（FPA）的相应校准。使用黑体（ε= 1）来源比较并验证了现场校准结果。在较宽的温度范围内，研究了辐射强度降低对噪声等效温差（NETD）的影响。这项研究表明，固定积分时间（微测辐射热计）红外​​热像仪的有效温度范围从1200℉（650℃）扩展到2192℉（1200℃），这使得该热像仪特别适合于研究火灾。在不改变焦平面阵列（FPA）的积分时间，不卸下相机镜头或不使用中性密度（ND）滤镜的情况下，以低成本实现了温度扩展。

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