The NK7100 series optical cable census instrument is based on the opticalfiberelastic opticaleffect,through the coherent demodulation of light to convertthe bending or vibration signalof the optical cable into visual and audio,accurately find and identify the target optical cable in a variety of environments such as human Wells,tunnels,pipelines and poles,and completely replace the previous cutting,bending,freezing and other optical cable identifi-cation methods. Engineers or technicians can easily find the target by tapping or shaking the cable,and the built-in system can quickly capture and convert the tapping information into audioand video signals to quickly locate the target cable. Its powerful application function greatly reduces the time and management cost of optical cable transmission network engineering,andimproves work efficiency.