FPA (focal plane array)-based uncooled thermal imaging optical system modulated by point grid beamsplitter

The invention relates to an FPA (focal plane array)-based uncooled thermal imaging optical system modulated by a point grid beamsplitter. The traditional aperture or incision can be replaced by the method for optical filtration. According to the method, light reflected by the focal plane array is modulated by the point grid beamsplitter to improve the imaging performance of the system. When a micro cantilever unit in the focal plane array is heated to be deflected, the angle and the position of the light reflected to the point grid beamsplitter change, the ratio of the penetrating light beam to the reflected light beam also changes correspondingly, the light received by a photodetector through an imaging lens changes, and an infrared thermal image of a radiating object is obtained via treatment. The optimal imaging effect can be achieved by adjusting the position relationship between the point grid beamsplitter and the focal plane array. Compared with the incision and aperture, stray light can be filtered more effectively, the signal-to-noise ratio and the detection sensitivity of the system can be improved, and the imaging quality of the system can also be improved. Moreover, the structure is greatly simplified.