光学精密工程2019，Vol.27Issue(1)：1-7,7.DOI:10.3788/OPE.20192701.0001
面向绝对重力仪的光束垂直性快速调节
Fast alignment of beam verticality for absolute gravimeters
摘要
Abstract
To reduce the influence of beam verticality on the accuracy of gravity measurement for freefall absolute gravimeters based on optical interferometry, a fast alignment method based on the adjustable deflection of the laser beam by two liquid-filled optical wedges to realize the self-correction of beam verticality was proposed.When the direction of the laser beam deviates from the plumb line, the liquid forms variable optical wedges under the force of gravity due to the nature of the liquid level.The laser beam is deflected when it passes through a double layer liquid-filled optical wedge from top to bottom.The deviation angle of the laser beam from the plumb line is corrected in real time by adjusting the refractive index of the liquid appropriately.A self-correcting device for beam verticality was built and verified experimentally.The results indicate that the angle rejection ratio of the device is better than 18.0.When the tilt angle of the device does not exceed 2.7′, the deviation of the output beam from the plumb line does not exceed 9.0″, corresponding to an error of g measurement less than1μGal (1μGal=10-8 m/s2).Assuming that this solution is used for free-fall gravitational acceleration measurement, it is expected that the beam verticality can be aligned quickly and accurately only by leveling with a tubular spirit level.Furthermore, it can also inhibit the influence of the gradualchange in beam verticality during the measurement.关键词
绝对重力仪/光楔/光束垂直性/激光干涉仪/自校正Key words
absolute gravimeter/optical wedge/beam verticality/laser interferometer/self-correction分类
信息技术与安全科学引用本文复制引用
王启宇,冯金扬,李春剑,粟多武,吴书清..面向绝对重力仪的光束垂直性快速调节[J].光学精密工程,2019,27(1):1-7,7.基金项目
国家重点研发计划重点专项项目 (No.2016YFF0200103) （No.2016YFF0200103）
中国计量科学研究院基本科研业务费专项资金资助项目 (No.22-AKY1608) （No.22-AKY1608）
国家计量基标准体系资源共享平台项目 (No.22-APT1801-7) （No.22-APT1801-7）
