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Enhanced sensitivity for hyperspectral infrared chemical detection

机译:增强高光谱红外化学检测的灵敏度

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The sensitivity of imaging, hyperspectral, passive remote sensors in the long-wavelength infrared (LWIR) spectral region is currently limited by the ability to achieve an accurate, time-invariant, pixel-to-pixel calibration of the elements composing the Focal Plane Array (FPA). Pursuing conventional techniques to improve the accuracy of the calibration will always be limited by the trade-off between the time required to collect calibration data of improved precision and the drift in the pixel response that occurs on a timescale comparable to the calibration time. This paper will present the results from a study of a method to circumvent these problems. Improvements in detection capability can be realized by applying a quick, repetitive dither of the field of view (FOV) of the imager (by a small angular amount), so that radiance/spectral differences between individual target areas can be measured by a single FPA pixel. By performing this difference measurement repetitively both residual differences in the pixel-to-pixel calibration and 1/f detector drift noise can effectively be eliminated. In addition, variations in the atmosphere and target scene caused by the motion of the sensor platform will cause signal drifts that this technique would be able to remove. This method allows improvements in sensitivity that could potentially scale as the square root of the observation time.
机译:在长波长红外(LWIR)光谱区域中的成像,高光谱,无源远程传感器的灵敏度当前受到构成焦平面阵列的元素的准确,时间不变的像素到像素校准的能力的限制(FPA)。追求常规技术以提高校准的准确性将始终受到在校准数据所需的时间之间的折衷所需的折衷,并且在与校准时间相当的时间段发生的少量尺度上发生的像素响应中的漂移。本文将介绍一种方法来介绍一种规避这些问题的方法。通过应用成像器的视野(FOV)的快速,重复抖动(通过小角度量)来实现检测能力的改进,从而可以通过单个FPA测量各个目标区域之间的辐射/光谱差异像素。通过重复执行这种差异测量,可以有效地消除在像素到像素校准和1 / F检测器漂移噪声中的剩余差异。此外,由传感器平台的运动引起的大气和目标场景的变化将导致信号漂移,即该技术能够去除。该方法允许改善可能尺寸为观察时间的平方根的灵敏度。

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