红外隐身涂层光谱发射率测量定标研究

Research on calibration of infrared stealth coating spectral emissivity measurement

受涂覆工艺、物理特性和气动应力等因素影响,飞机红外隐身涂层容易产生裂纹、剥落等损伤。监控涂层光谱发射率是红外隐身涂层状态监控的一种有效手段。光谱发射率监控设备的定标直接影响涂层光谱发射率测量结果的可信度,进而影响飞机红外隐身特性的评估结果。针对光谱发射率测量定标需求,研究了积分球定向积分反射比测量系统定标方法,并开展红外隐身涂层样品的测量校准和参考样品定标试验,结果表明:提出的定标方法能够缩小参考样品光谱发射率带来的误差,控制参考样品光谱发射率与标准黑体辐射源光谱发射率之间的误差小于0.02,涂层样品的光谱发射率测量示值误差控制在0.03以内,满足隐身飞机涂层监控测量和定标需求。

Affected by factors such as coating process,physical characteristics and aerodynamic stress,aircraft infrared stealth coating is prone to cracks,peeling and other damage.Monitoring the spectral emissivity is an effective means of monitoring the state of the infrared stealth coating.The calibration method of the spectral emissivity monitoring equipment directly affects the credibility of the coating emissivity measurement results,and then affects the evaluation results of the aircraft′s infrared stealth characteristics.Aiming at the calibration requirement of spectral emissivity measurement,the calibration method for the directional integral spectral reflectance measurement system is studied,and then the methods are applied to a certain coating sample measurement and calibration test.The result shows that the proposed calibration method can reduce the spectral emissivity error caused by the reference sample,and control the spectral emissivity error between the reference sample and the standard blackbody radiation source to be less than 0.02,and measurement indication error of the coating emissivity is also controlled within 0.03,which satisfies the measurement and calibration requirements of stealth coating monitoring.