Shutter-less calibration of uncooled infrared cameras
Shutter-less calibration of uncooled infrared cameras
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DOI：
10.5194/jsss-5-9-2016
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发表时间：
2016-01-14
影响因子：
1
通讯作者：
Gerlach, G.
中科院分区：
文献类型：
--
作者：
Tempelhahn, A.;Budzier, H.;Gerlach, G.
基于微测辐射热计焦平面阵列（FPA）的红外（IR）相机是热成像中使用最广泛的相机。新的应用领域，如手持设备和小型分布式传感器，从成本和尺寸减小方面的最新传感器改进中受益。为了补偿来自变化的环境条件的干扰影响，辐射照相机使用光学快门用于在线重新校准目的，部分还与传感器温度稳定一起使用。对于这些新的应用，红外相机应该只包括红外光学，传感器阵列和数字信号处理（DSP）。对于可接受的测量不确定性值，在不使用光学快门（无快门）的情况下，必须根据相机内部的温度测量来处理热条件变化的干扰影响。我们提出了一种补偿方法的基础上，在受控的环境条件下的校准测量。所有校正参数在校准过程中确定。如果没有传感器温度稳定（TEC-少），像素响应度也会受到相机温度变化的影响，必须单独考虑。本文介绍了补偿过程的细节，并讨论了获得低温度测量不确定度的相关问题。将残余测量不确定度值与基于快门的补偿方法进行比较。
Infrared (IR) cameras based on microbolometer focal plane arrays (FPAs) are the most widely used cameras in thermography. New fields of applications like handheld devices and small distributed sensors benefit from the latest sensor improvements in terms of cost and size reduction. In order to compensate for disturbing influences derived from changing ambient conditions, radiometric cameras use an optical shutter for online recalibration purposes, partially also together with sensor temperature stabilization. For these new applications, IR cameras should consist only of infrared optics, a sensor array, and digital signal processing (DSP). For acceptable measurement uncertainty values without using an optical shutter (shutter-less), the disturbing influences of changing thermal conditions have to be treated based on temperature measurements of the camera interior. We propose a compensation approach based on calibration measurements under controlled ambient conditions. All correction parameters are determined during the calibration process. Without sensor temperature stabilization (TEC-less), the pixel responsivity is also affected by the camera temperature changes and has to be considered separately. This paper presents the details of the compensation procedure and discusses relevant aspects to gain low temperature measurement uncertainty. The residual measurement uncertainty values are compared to the shutter-based compensation approach.