近红外激光照明器均匀性评价技术研究

近红外激光照明是在低照度情况下,用近红外激光作为光源对远距离目标进行主动照明.由于激光的产生机制、匀光装置和照明器采用的光学系统公差、大气湍流等因素,近红外激光光束在目标面上的光强空间分布不均匀,对成像、观测准确度产生较大影响.本文提出采用近红外激光光强功率谱衡量照明近红外激光光强分布均匀性,即采用归一化后光强功率谱所围成的面积作为衡量近红外激光照明均匀性的参量.利用这种方法,对不同的近红外激光照明器,在相同的工作状态下的照明均匀性评估参量进行了研究,结果验证了采用归一化后光强功率谱所围成的面积作为评价参量的合理性.

Illumination Uniformity of Near Infrared Illuminator

Near infrared laser illumination is in low illumination situation, using near infrared lasers as the light source for long-distance target active lighting. Because of the laser generation mechanism, the optical system tolerance, atmospheric turbulence and other factors, the laser intensity spatial distribution on the target plane is not uniform, which has great impact on image resolution and tracking accuracy. In this paper, the area surrounded by normalized PSD (power spectral density) is adopted to evaluate the near infrared laser illumination intensity uniformity. Using this method, different near infrared laser illuminator's uniformity evaluation parameters are studied, in the same work condition. The results verify the reasonableness of the laser power spectrum as an evaluation parameter.