T-1A型高精度绝对重力仪

高精度绝对重力仪用于测量地球表面的重力加速度（g，常用值9.81 m/s2），在精密计量、大地测量、地球物理、资源勘探等领域具有广泛应用。近年来，清华大学自主研制完成T-1与T-1A型高精度绝对重力仪，采用新型的自由落体装置、激光干涉测量技术和信号处理方法，可实现微伽量级不确定度的精密重力测量。本文主要介绍T-1A型高精度绝对重力仪的系统技术和测试结果，经过进一步工程化改进，该仪器有望实际应用于重力计量、地震研究等领域。

The T-1A High Precision Absolute Gravimeter

The high precision absolute gravimeters, which measure the local gravitational acceleration (g, normal value 9.81 m/s2), are widely applied in metrology, geodesy, geophysics and mineral exploration. Recently, two absolute gravimeters named T-1 and T-1A have been developed in Tsinghua University. With novel design of the dropping mechanism, the laser interferometer and the signal processing method, both of the absolute gravimeters realize high precision gravity measurements at microgal level. In this paper, the T-1A absolute gravimeter and its results are presented. With further engineering improvements, the instrument is hopefully to be applied in gravity metrology and earthquake research areas.