噪声等效温差(Noise Equivalent Temperature Difference,NETD)是评价红外探测器灵敏度的关键指标.通过改变读出电路结构,提高读出电路的电荷处理能力,使探测器的NETD值从10 mK量级提升至1mK以下.当噪声小于1个灰度时,采用现有测试方法得到的NETD值较低,导致整机应用时识别距离评估过高,与实际结果不符.本文提出的优化方法使测试结果与系统应用指标更符合.经分析认为,所用探测器更适用于低速目标或者相对静止场景;与常规探测器相比,该探测器的识别距离受相同光学温度变化的影响更大.建议用户关注光学温度稳定性的影响.
Test Evaluation of Ultra-High Sensitivity Infrared Detectors
Noise equivalent temperature difference(NETD)is a key indicator for evaluating the sensitivity of infrared detectors.By changing the readout circuit structure and improving the charge processing capability of the readout circuit,the NETD value of the detector is increased from 10 mK to below 1 mK.When the noise is less than 1 gray level,the NETD value obtained by the existing test method is low,resulting in an overesti-mation of the recognition distance when the whole machine is used,which is inconsistent with the actual re-sults.The optimization method proposed in this article makes the test results more consistent with the system application indicators.After analysis,it is believed that the detector used is more suitable for low-speed targets or relatively static scenes;compared with conventional detectors,the recognition distance of this detector is more affected by the same optical temperature change.Users are advised to pay attention to the impact of opti-cal temperature stability.
noise equivalent temperature differencereadout circuitlow-speed targetoptical temperature stability
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维普
