物理学报2016，Vol.65Issue(10)：100601-1-100601-6,6.DOI:10.7498/aps.65.100601
二次偏振调制测距系统中调制频率与测距精度的关系∗
Relationship b etween mo dulation frequency and range accuracy in the double p olarization mo dulation range finding system
摘要
Abstract
Accurate measurement of absolute distance is crucial for developing the progressive military, aerospace, manufac-turing large scientific instruments and other fields. Instead of the traditional phase discrimination scheme in general phase-shift distance measurement, the double polarization modulation range-finding system can simplify the simulation phase circuit, reduce the phase shift noise and improve the accuracy by using interference phase demodulation. The in-depth discussion of theoretical derivation and experimental verification are proposed based on the double polarization modulation range-finding system. The detailed theoretical analysis of optical structure is proposed, and the factors affecting the range accuracy are analyzed based on the theoretical formula of ranging result. Finally, the theoretical formula of range accuracy is obtained, and experimental validation is carried out. In this experiment, the wavelength of laser source is 735 nm, and the phase modulator is 4431 model from the Newport company. The ranging experi-ment is conducted in the modulation frequency ranges of 0.75–0.85 GHz, 2.7–2.8 GHz, 4.3–4.4 GHz, 6.1–6.2 GHz, and 7.8–7.9 GHz. Experimental results indicate that the measurement accuracy of phase-shift range-finding technology is improved with the increase of modulation frequency. Moreover, the accuracy is proportional to the parameter ∆f/N , in which ∆f is the modulation frequency uncertainty and N is an integer in our algorithm. With the appropriate modulation frequency, the range accuracy of the double polarization modulation range-finding system can reach up to 10−7.关键词
激光测距/二次偏振调制/变频测距/调制频率Key words
laser distance measurement/double polarization modulation/variable frequency distance measurement/modulation frequency引用本文复制引用
肖洋,于晋龙,王菊,王文睿,王子雄,谢田元,于洋,薛纪强..二次偏振调制测距系统中调制频率与测距精度的关系∗[J].物理学报,2016,65(10):100601-1-100601-6,6.基金项目
国家自然科学基金(批准号:61427817,61405142)和高等学校博士学科点专项科研基金(批准号:20120032130010)资助的课题 （批准号:61427817,61405142）
