CAJ | 학술논문

为了提高相位法激光测距的速度和精度,提出了一种新的相位差放大测量方法,在不增加测量时间的同时将测相精度提高1/N倍,并结合欠采样技术避免了混频器和其他多余器件的使用,减小了串扰对系统的影响.考虑高频弱光信号入射到雪崩光电二极管上会在输出信号上产生相位延迟,提出灵活控制加在雪崩光电二极管上的反向偏压来减小相位延迟的方法,对于调制频率为18.5 MHz,波长为650 nm的激光,当入射光强度为0.5 μW时,可将相位延迟从1.4°压缩到0.03°之内.建立了信号串扰产生测相误差的数学模型,并通过实验给出了采取不同屏蔽措施时串扰对测相误差的影响.实验结果表明,采用上述方法,当调制频率为18.5 MHz时,测相精度为0.014°,相应的测距精度可达0.3 mm.
위료제고상위법격광측거적속도화정도,제출료일충신적상위차방대측량방법,재불증가측량시간적동시장측상정도제고1/N배,병결합흠채양기술피면료혼빈기화기타다여기건적사용,감소료천우대계통적영향.고필고빈약광신호입사도설붕광전이겁관상회재수출신호상산생상위연지,제출령활공제가재설붕광전이겁관상적반향편압래감소상위연지적방법,대우조제빈솔위18.5 MHz,파장위650 nm적격광,당입사광강도위0.5 μW시,가장상위연지종1.4°압축도0.03°지내.건립료신호천우산생측상오차적수학모형,병통과실험급출료채취불동병폐조시시천우대측상오차적영향.실험결과표명,채용상술방법,당조제빈솔위18.5 MHz시,측상정도위0.014°,상응적측거정도가체0.3 mm.
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.