研究了多光束非定域干涉现象，得到了多光束非定域干涉的透射光强分布函数。理论研究结果表明，干涉圆环中心位置光强与定域干涉结果一致。对得到的多光束非定域干涉透射光强分布函数进行了数值分析，分析结果表明随着镜面反射系数的增加，非定域干涉条纹变得更加锐细，光谱分辨率提高，同时在低干涉级次处出现了噪声，并且反射系数越高，噪声越明显。在镜面间距不变的情况下，通过改变观察屏位置，对透射光强分布进行数值分析，结果表明干涉级次与干涉圆环倾角的余弦值存在线性关系，通过求斜率可以得到镜面间距。保持观察屏位置不变，通过改变镜面间距，数值分析结果表明干涉级次与干涉圆环半径平方存在线性关系，并且直线斜率与镜面间距也存在线性关系。%The authors studied the nonlocalized interference in multiple-beam interferometer .The light intensity distribution function was obtained .The result shows that the function in the circle center has the same form with localized interference . Numerical simulation method was used to analyse the light intensity distribution function .As the reflection coefficient increases , the stripe becomes sharp ,Resolution ratio was improved ,while the noise occured around the lower interference index .The noise becomes obviously as the reflection coefficient increases .While changing the receiving screen distance ,the simulation result shows that linear relationship exists between inteference index and cosine value of interference stripe dip angle .The mirror spac-ing can be obtained through the straight line slope .With changing the mirror spacing ,the numerical simulation result shows that linear relationship exists between interference index and stripe radii square .The straight slope shows a linear relationship with the mirror spacing .
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