STRAIN SENSING SYSTEM USING TIME-OF-FLIGHT DETECTION FOR OPTICAL PULSE TRAINS OF PULSE LASER

摘要

Provided is an apparatus for sensing a strain of a measurement object using flight time detection of an optical pulse train generated by a pulse laser. In one embodiment, the present invention comprises: a pulse laser generating the optical pulse train; an RF signal source for generating a microwave signal; a first phase detector for synchronizing the microwave signal with the optical pulse train to cause the RF signal source to generate a reference signal; a strain sensing head for causing a change in the flight time of the optical pulse train according to deformation of an object to be measured; and a second phase detector for measuring a change in the flight time of an optical pulse train output from the strain sensing head using the reference signal.