Development of an atom gravimeter and status of the 10-meter atom interferometer for precision gravity measurement
Experimental realizations of cold (85)Rb atom interferometers in Wuhan are reviewed in this paper. The application of atom interferometers in local gravity measurement are reported. The resolutions of gravity measurement are 2.0 x 10(-7)g for 1 s and 4.5 x 10(-9)g for 1,888 s. The absolute g value was derived with a difference of 1.6 x 10(-7)g compared to the gravity reference value. The tidal phenomenon was observed by continuously monitoring the local gravity over 123 h. A 10-meter atom interferometer designed for precision gravity measurement and the equivalence principle test is under construction, the latest status is reported for the first time.