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| The Diffraction Correction for Interferometric Absolute Gravimeters |
| LI Chun-jian,SU Duo-wu,WU Shu-qing,FENG Jin-yang,XU Jin-yi |
| Division of Mechanics and Acoustics, National Institute of Metrology, Beijing 100029, China |
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Abstract Based on the operating principle of an interferometric absolute gravimeter, a deviation of the measured gravitational acceleration value introduced by Gaussian laser beam is analyzed. And then a practical method, 90/10 knife-edge method, to measure the beam waist radius for diffraction correction is presented and the relative value of diffraction correction is obtained. Experimental results indicate that the beam waist radius is 1.1586mm and the relative value of diffraction correction is 7.56×10-9. The solution to determine diffraction correction applies to every interferometric absolute gravimeter.
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Received: 10 April 2015
Published: 16 June 2017
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2017, Vol. 38 
