| Laser ranging technology has been widely used in various fields since the first ruby laser was invented,due to its characteristics of energy concentration,good coherence,and directionality.In the laser ranging based on the time-of-flight method,the application of single-photon detection technology and time-correlated single-photon counting technology can improve the sensitivity of echo detection to at least the photon or even single-photon level,greatly reducing the requirements for laser source energy in ranging.Due to the high sensitivity and low timing jitter of single-photon detection technology,single-photon ranging technology has broad application prospects in long-distance and high-precision target detection.Currently,the accuracy of single-photon ranging is mostly at the millimeter level,and the complex structure of the ranging system limits the application range of single-photon ranging technology.Therefore,developing practical high-precision single-photon ranging technology has practical significance.This article focuses on practical high-precision single-photon ranging technology and studies narrow-pulse laser sources and low-time-jitter single-photon detection technology.An experimental setup for sub-millimeter high-precision single-photon ranging was built,and high-precision timers were used,along with a laser source with a pulse width of 160 ps and a high-precision single-photon detector with a timing jitter of 411 ps.The introduction of a reference light signal suppression system for delay drift provided a hardware basis for achieving high-precision single-photon ranging.At the same time,a spatial coaxial receiving and transmitting optical path design was adopted to simplify the structure of the ranging system,improve stability and practicality.The experimental results show that the ranging accuracy of this system within a range of 2m reaches370μm@RMS,providing an effective solution for realizing practical,small,and high-precision single-photon ranging. |
PDF Full Text Request