In the counting system, a semiconductor laser emitter is used as the light source, point laser beam produced by optic system, reflection of part transferred into electric signal by photoelectric triode, and SCM system as the counter.

• 采用半导体激光发射器作为光源，经过光学系统形成的最小激光束照射器件，反射光由光电三极管进行光电转换，计数控制使用单片机系统。