在红外光电探测系统中,一般都是弱光信号的检测和测量,为了实现光能量的全接收,需要对能量接收系统的光斑大小进行测量,故光斑大小的测试对于红外光电探测系统而言显得尤为重要。文章提出一种测试红外光斑大小的方法。首先,针对样品参数搭建光学平台,并对光源发射光信号进行辐射调制,运用锁相放大技术读取探测器探测到的有效信号,并采用三维扫描技术测量真实的光斑大小以及能量分布情况。测试结果表明有效靶面未能对光斑能量全接收。 In the infrared photodetection system, the detection and measurement of weak light signals are generally performed. In order to realize the full reception of light energy, the spot size of the energy receiving system needs to be measured. Therefore, the test of the spot size appears to the infrared photodetection system Particularly important. The article presents a method of testing the size of the infrared spot. First of all, the optical platform is set up for the sample parameters, and the light emitted by the light source is radiated modulated. The effective signal detected by the detector is read by the phase-locked amplification technology. The real spot size and the energy distribution are measured by the three-dimensional scanning technology. Test results show that the effective target surface failed to receive the full spot energy.