National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [61404095, 91536223]; Foundation of Hubei Provincial Department of Education [Q20151704]
机构署名：
本校为第一且通讯机构
院系归属：
电气与电子工程学院
摘要：
Due to its high sensitivity to weak forces, the classical torsion pendulum was widely employed in the fields of precision gravitational measurement, which can be evaluated by testing of Newtonian inverse square law (ISL). In order to get much higher precision for the tests of ISL at short ranges, such as at millimeter and/or sub-millimeter level, the torsion pendulum cannot work precisely in free oscillation motion due to the electrostatic disturbance. This paper presents a method using proportional-integral-differential (PID) technology to make pendulum to keep quasi-static. A closed-loop sys...
