| Micro-Gal laser absolute gravimeter based on high precision heterodyne interferometer |
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| 作者姓名： | 张志平 程兆谷 覃兆宇 朱健强 |
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| 作者单位： | Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences，Shanghai Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Shanghai Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Shanghai Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Shanghai 201800，Shanghai 201800，Shanghai 201800，Shanghai 201800 |
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| 摘 要： | A micro-Gal absolute gravimeter based on high-precision and high-stability heterodyne interferometer is presented.The distance measuring technology of the gravimeter is studied in detail.The experimental results of distance measuring for a free-falling motion show that the high-precision heterodyne interfer- ometer described in this paper can meet the demand of a micro-Gal absolute gravimeter with relative uncertainty of 6.4×10~(-9).Moreover,the heterodyne interferometer is more stable than the Mach-Zehnder interferometer(MZI)which is widely used in present absolute gravimeters.
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