利用细菌视紫红质膜的互补抑制调制透射特性建立了新型光学滤波器,可用于光学图像非相干亮背景的处理.我们演示了这种新型滤波器并对它的特性进行了理论分析.计算结果表明,处理后的图像质量(对比度,透射光强及其空间分布)受膜参数(浓度,M态寿命)和偏置光强的影响.透射光强及其空间分布的弯曲度随膜浓度的变大而变小,对比度先升高至最大值后降低至0.M态寿命变大时,透射光强及其空间分布的弯曲度都变大,对比度增大至一稳定值.透射光强随偏置光强的增大而减小,但其空间分布的弯曲度保持不变,对比度可以增大至1.当膜浓度,M态寿命和偏置光强过大时,处理后的图像将发生畸变.

Special property of complementary suppression modulated transmission (CSMT) of bacteriorhodopsin (bR) film was used to establish a new kind of optical filter,which can be used to remove incoherent bright-background in optical image. This new kind of optical filter was demonstrated and its behavior was analyzed theoretically. The calculated results showed that the quality (the contrast, the transmitted intensity and the space distribution) of the processed image was affected by the parameters (concentration and lifetime of M state) of bR film and the intensity of the bias light. With the increasing of bR film concentration, the transmitted intensity and the curvature degree of the space distribution of the transmitted intensity decreased, and the contrast increased to the maximum and then decreased to zero. By prolonging the lifetime of M state, the transmitted intensity, the curvature degree of the space distribution of the transmitted intensity increased and the contrast increased to the stable value. Accompanying the increase of the intensity of the bias light, the transmitted intensity decreased,the space distribution was not changed, and the contrast can be increased to 1. Butwhen the concentration of bR film, the lifetime ofM state and the intensity of the bias lightwere too large, the p rocessed image might be distorted.