一种用于标定重力仪的引力场装置

Gravitational field device for calibrating gravimeters

为了对冷原子绝对重力仪和CG6相对重力仪等重力仪的分辨率进行高精度标定,研制了标准引力场装置.该装置采用环形配置的不锈钢球作为吸引质量,利用大载荷导轨进行上下移动,产生的竖直方向加速度变化范围为±11.1μGal,不确定度小于0.1μGal.使用该装置对CG6相对重力仪进行了标定,装置产生的加速度为5.1(1)μGal,CG6测量值为5.4(5)μGal,两者在误差范围内较为相符.CG6测量值的不确定度为0.5μGal,这是影响标定结果的主要因素.

In order to precisely calibrate the resolution of cold atom and CG6 relative gravimeters,a gravitational field device was built.In the device,the stainless steel spheres that placed in the ring configuration were used as source masses,which were lifted with large load guide rails.The device can produce a gravitational acceleration with a varying range of±11.1μGal along vertical direction,with a relative standard uncertainty of less than 0.1μGal.Using this device,the CG6 relative gravimeter was calibrated.The acceleration generated by the device is 5.1(1)μGal,and the acceleration measured by the CG6 is 5.4(5)μGal,which are consistent within the error range.The uncertainty of the acceleration measured by the CG6 is 0.5μGal,which is the main factor affecting the calibration result.