The invention discloses a
light source mode
measuring instrument. The
light source mode
measuring instrument comprises a
light source adapter (601), a beam expanding concave lens (5), an inner lens cone (603), an annular
mode selection mirror (21), a guide rail (605), a photoelectric
detector PD (3), transmission plate glass (607), a holophote (4), an outer lens cone (609), a battery bin and circuit
assembly (610) and an angle ruler (611). The annular
mode selection mirror and the photoelectric
detector (PD) (3) can move towards the same direction, and in the moving process, light of multiplemodes emitted by the multimode light source is different in emergent angle corresponding to different
modes and finally can be sequentially reflected to the photoelectric
detector (PD) (3). That is tosay, the power of the multimode light source in all propagation
modes can be sequentially collected and recorded by the photoelectric detector (PD) (3), and all
light propagation modes of the light source can be measured by corresponding to the emergent angle shown by the angle scale on the outer lens cone. The
measuring instrument is simple in structure, accurate in measurement and low in cost.