Burris型重力仪温度特性研究  

Temperature Characteristics of Burris Relative Gravimeter

作　　者：赵云峰[1] 隗寿春 梁伟锋[1] 刘芳[1] 祝意青[1] ZHAO Yunfeng;WEI Shouchun;LIANG Weifeng;LIU Fang;ZHU Yiqing(The Second Monitoring and Application Center,CEA,316 Xiying Road,Xi＇an 710054,China)

机构地区：[1]中国地震局第二监测中心,西安市西影路316号710054

出　　处：《大地测量与地球动力学》2018年第8期877-880,共4页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(41374026;41274083)~~

摘　　要：通过对多台Burris型相对重力仪实施不同时长的断电、再通电后进行静置测量,研究该型仪器的温度特性。在温度约为14℃的地下室内,长时间断电冷却后,Burris型相对重力仪需要125min才能达到恒温点(仪器不再提示温度不足),通电65h后零漂率仍然大于0.005×10-5 m·s-2/h,110h后仪器的零漂才能达到地震观测仪器进网要求的小于0.003×10-5 m·s-2/h。在相同条件下,对3台Burris型重力仪分别实施15min、2h、24h较短时间冷却、再通电,静置测量数据表明,在升温过程中,重力仪读数过程为先大幅减小后小幅增大再变小至稳定,绝对变化率先减小后少量增大再变小;不同冷却时间既影响仪器到达恒温点需要的时间,也影响仪器读数稳定的时间。15min的断电需要大约1h的加热过程才能使读数稳定;仪器到达恒温点后读数仍在快速变化中,且仪器读数变化中的最小值出现在到达恒温点后;断电可能会影响再通电仪器读数稳定后在短时间内的观测精度。We study temperature characteristic of Burris relative gravimeters,employing three gravimeters which have cooled for different times.After cooling about one month in a basement where temperature is about 14 ℃,one Burris gravimeter did not reach a constant temperature point,when the tips of bad temperature disappear,until the meter was heated 125 minutes.The zero drift rates were larger than 0.005×10^-5 m·s^-2/h after 65 hours and smaller than 0.003×10^-5 m·s^-2/h after 110 hours from the beginning of heating.After the three gravimeters cooled 15 minutes,2 hours and 24 hours,the gravimeters show that the temperature reading sharply falls and then slightly increases and falls before the reading is stable,and the absolute change rate also decreases and then increases and decreases again.The measurement indicates that the reading is not stable until the gravimeter is heated after one hour when the gravimeter is powered off 15 minutes.In the process of heating-up,the reading sharply changes after the gravimeter reads a constant point and the minimum of reading change appears after the temperature of the meter is stable.The study indicates that the measurement precision of one of three gravimeters decreases compared with its past.

关 键 词：Burris型重力仪 升温过程 读数变化 

分 类 号：P204[天文地球—测绘科学与技术]