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光学渡越辐射（ＯＴＲ）作为中高能段束流诊断方法，已被广泛地研究。低能ＯＴＲ的分布不像高能时那样集中于反射方向附近一个极小的角度内，而是在沿反射方向的很大的立体角内分布，且斜入射时强度分布极不对称。这使低能ＯＴＲ 的实验装置与高能时有些不同。为此，从Ｍａｘｗ ｅｌｌ＇ｓ 方程组出发详细推导了电子斜入射时适用于各能段的光学渡越辐射光强的空间分布公式。以此为基础建立了实验装置，并利用ＣＣＤ摄像机得到了４ ＭｅＶ 电子束流的ＯＴＲ光斑，为进一步的研究打下基础
Optical transitional radiation (OTR) has been extensively studied as a diagnostic method for mid-high energy beam currents. The distribution of low-energy OTRs is not concentrated in a very small angle near the reflection direction as in the case of high-energy but in a large solid angle along the reflection direction, and the intensity distribution is extremely asymmetric at oblique incidence. This makes the low energy OTR experimental device somewhat different from high energy. Therefore, based on the Maxwell’s equations, the spatial distribution formulas of the optical transition radiation intensities applied to the various energy segments during electron oblique incidence are derived in detail. Based on this, an experimental setup was established and the OTR spot of 4 MeV electron beam was obtained by CCD camera, laying a foundation for further research