光学精密工程2009，Vol.17Issue(10)：2377-2384,8.
相位法激光测距接收系统
Phase-shift laser range finder receiver system
摘要
Abstract
In order to improve the measuring rate and resolution of a phase-shift laser range finder,a new phase shift magnification detecting method is proposed,which improves the measurement resolution by 1/N times without increasing the measuring time.Then,a under-sampling technique is adopted to perform multi-frequency modulation in the same system,which avoids using the mixer and other accessorial components to reduce scheme complexities and the influence of crosstalk.As the phase delay caused by the high frequency weak light incident upon a Avalanche Diode (APD) will induce the distance measurement errors,a new method is presented by controlling the bias voltage acting on APD to suppress the phase delay.For a modulation frequency of 18.5 MHz,a wavelength of 650 nm and an incident light intensity of 0.5 μW,the phase delay can be reduced from 1.4° to less than 0.03°.Moreover,a mathematic model is established based on the phase shift measurement errors caused by signal acrosstalks and several kinds of electrostatic screen methods are given to avoid the acrossatlk.Experimental results show that adopting those methods mentioned above can get the phase shift measurement resolution of 0.014° and the distance measurement resolution of 0.3 mm accordingly when the modulation is 18.5 MHz.关键词
激光测距/接收系统/串扰/欠采样/相位测量Key words
laser range finder/receiver system/crosstalk/under-sampling/phase-shift measurement分类
信息技术与安全科学引用本文复制引用
贾方秀,丁振良,袁锋..相位法激光测距接收系统[J].光学精密工程,2009,17(10):2377-2384,8.基金项目
国家自然科学基金资助项目(No.50275040) （No.50275040）
