Yang Fu, He Yan, Shang Jianhua, Chen Weibiao
Shanghai Key Laboratory of All Solid-state Laser and Applied Techniques, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China.
Appl Opt. 2009 Dec 1;48(34):6575-82. doi: 10.1364/AO.48.006575.
In this paper, a 1550 nm all fiber monostatic laser range finder system based on linear chirp modulation and heterodyne detection is presented. The fiber end face signal is used as a range starting indicator. The transmitted laser power is 5 mW with a laser pulse length of 131 micros and a linear chirp bandwidth of 40 MHz. The telescope with an aperture of 3 cm couples the return light into a single mode fiber. Better than 14 cm distance accuracy and 26 dB SNR can be achieved for a wood target at a distance of about 43 m by using the above system setup. Several experiments with different system parameters are conducted. The system performance is tested under variable laser pulse length, linear chirp bandwidth, local oscillator power, and background noise. Finally, an application of the linear chirp modulation heterodyne laser range finder in a spaceborne ranging system is proposed.
本文提出了一种基于线性啁啾调制和外差检测的1550nm全光纤单基地激光测距仪系统。光纤端面信号用作测距起始指示。发射激光功率为5mW，激光脉冲长度为131微秒，线性啁啾带宽为40MHz。孔径为3cm的望远镜将返回光耦合到单模光纤中。使用上述系统设置，对于距离约43m的木质目标，可实现优于14cm的距离精度和26dB的信噪比。进行了几个不同系统参数的实验。在可变激光脉冲长度、线性啁啾带宽、本地振荡器功率和背景噪声下测试了系统性能。最后，提出了线性啁啾调制外差激光测距仪在星载测距系统中的一种应用。
