Patent ID: 11902495
Assignee: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. An ultrafast camera system comprising:
a sensor head that injects an optical pulse train input from a pulsed laser onto a surface of a measurement target and outputs an optical signal reflected from the surface; and
a timing detector that receives the optical signal whose time-of-flight is changed after passing through the sensor head and outputs an electrical signal corresponding to a timing error between the optical signal and a reference signal,
wherein the timing detector modulates the optical signal using the reference signal in a loop where the optical signal is divided and then the divided signals circulate in different directions, and obtains an intensity difference of two interference signals which are generated from interference between the signals circulating the loop, through balanced photodetection, and
wherein the intensity difference of the two interference signals is an electrical signal proportional to a timing error between the optical signal and the reference signal.