Range-finding capability of laser range finder by extinction-ratio measurement without target

The range-finding capability is one of the major performance of the laser range finder.A new checking method of the range-finding capability,extinction ratio measurement without target,by which laser emission capability and reception capability can be dividually measured,is put forward.Based on which,a new tester for the range-finding capability of laser range finders is developed. No targets are necessary.It is no more restricted to environment nearby,and an accurate result can be acquired rapidly.It proved to be instructional for maintenance.