光纤探测方式下全积分球与半积分球性能对比研究

Performance comparison between full-integrating sphere and semi-integrating sphere under optical fiber detection manner

为比对全积分球和半积分球在光路传输、输出信号上的差异,根据积分球基本原理分别建立了全积分球和半积分球的光学传输模型,推导了两种积分球在光纤探测方式下的输出信号强度表达式,并从理论和实验上对这两种积分球的探测性能进行了比对。结果表明,全积分球与半积分球的输出信号和探测灵敏度均与积分球涂层反射率、积分球半径、光纤数值孔径角有关;半积分球性能是否优于全积分球取决于漫反射涂层以及平面反射镜反射率的选取。当理想情况下平面反射镜的反射率等于1时,半积分球的信号强度是全积分球的2倍。

To make clear the differences of optical path transmission and output signal between full-integrating sphere and semi-integrating sphere, the optical transmission models of the two integral spheres under fiber detection manner were established respectively. The formulas of output signal intensity and detection sensitivity were derived for the two kinds of integrating sphere tests. Based on the derived formulas, the theoretic analysis and verification experiments were conducted. It is found that both the signal intensity and the detection sensitivity for the two kinds of sphere tests depend on the coating reflectivity, the radius of integral sphere and the numerical aperture angle of optical fiber. Whether the semi-sphere performance is better than the full-sphere depends on the selection of the diffuse coating refleetivity and the mirror refleetivity. High reflectivity of mirror coating can improve the semi-integrating sphere sensitivity, while the low value can reduce the output. When the reflectivity of mirror coatings tends to 1, the output signal intensity of semi-sphere can be 2 times as the one of full-sphere.