[Objective]Single-photon detection and single-photon ranging systems have widespread applications in three-dimensional ima-ging and long-distance spatial remote sensing.However,device limitations and background noise from the sun light limit the applica-tion to only nighttime conditions.[Methods]We have improved traditional laser radar systems by implementing all-fiber optics systems with ultra-narrowband fiber optic filtering,leading to significantly improved system stability.By implementing mechanical motion con-trol,we are able to attain single-photon imaging systems with ultra-wide scanning and ultra-high resolution.The systems can operate in optical environments that are typically challenging,such as daytime or foggy weather.Moreover,the laser radar system is designed based on the 1 550 nm wavelength which has good atmospheric penetration and low transmission loss,enhancing its ability to work in foggy and rainy conditions.[Results]In a foggy condition with a visibility of about 500 m,the system achieves three-dimensional ima-ging of objects 1.6 km away,which is a distance 3 times longer than the visibility at the time.The distance resolution can be signifi-cantly enhanced by optimizing the intensity and distance information of the histogram using the minimized negative logarithmic likeli-hood function,with the assistance of a high-resolution time/digital converter and the model constructed by the system response function of the laser radar.Compared to the maximum value method with a distance resolution of 0.05 m,this system achieves a distance reso-lution of 0.006 m via the minimized negative logarithmic likelihood function method.Additionally,the image normalization processing is performed to suppress fluctuations in photon technology and eliminate noise in the image.The 1 550 nm all-fiber laser radar system has strong mechanical stability and can work in adverse weather conditions.[Conclusion]It has significant application value in remote sensing and mapping,ground and vehicle-mounted laser radar,and other fields.
关键词
单光子探测/激光雷达/光子飞行时间/短波红外
Key words
single photon detection/laser radar/time of flight/shortwave infrared
维普
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