力平衡反馈式地震计反馈力系数动态测试研究

doi:10.12196/j.issn.1000-3274.2022.04.014

地震 ›› 2022, Vol. 42 ›› Issue (4): 175-183.doi: 10.12196/j.issn.1000-3274.2022.04.014

• • 上一篇

力平衡反馈式地震计反馈力系数动态测试研究

张兵^1,2, 李珍¹, 朱小毅¹, 薛兵¹, 苏鹏^1,2, 吴旭¹, 黄诗¹

1.中国地震局地震预测研究所, 北京 100036;
2.南京大学, 江苏南京 210023

收稿日期:2021-09-30 修回日期:2022-01-24 发布日期:2023-03-31
通讯作者: 朱小毅, 研究员。 E-mail: zxy_bj2008@126.com
作者简介:张兵(1983-), 男, 山东曲阜人, 在站博士后, 副教授, 主要从事地震仪器设备关键技术研究。
基金资助:
中国地震局地震预测研究所基本科研业务费专项(2020IEF0507); 国家重点研发计划“重大自然灾害监测预警与防范”重点专项(2018YFC1503904); 廊坊市科技支撑计划项目(2021011057)

Study on Dynamic Testing of Feedback Force Coefficient of Force Balance Feedback Seismometer

ZHANG Bing^1,2, LI Zhen¹, ZHU Xiao-yi¹, XUE Bing¹, SU Peng^1,2, WU Xu¹, HUANG Shi¹

1. Institute of Earthquake Forecasting, China Earthquake Administration, Beijing 100036, China;
2. Nanjing University, Nanjing 210023, China

Received:2021-09-30 Revised:2022-01-24 Published:2023-03-31

摘要/Abstract

摘要： 力平衡反馈式地震计反馈力系数为多物理量复合的技术参数, 对地震计的灵敏度和仪器响应起到至关重要的作用。现有的测量反馈力系数的方法通过测量磁缸磁感应强度、线圈长度和摆锤质量来进行静态计算测量, 该方法频带窄, 处于固有频率以内, 且受摆的机械特性影响较大。本文提出一种在高于固有频率的频带上, 利用不同频点上的相关物理量计算反馈力系数的动态测试方法, 实现了测试过程与机械摆解耦, 且其标定与摆的机械特性无关。实验测试表明, 该方法在6倍固有频率以内测量结果稳定, 相对精度为4%, 绝对精度为0.29 m·s^-2·A^-1。与传统方法相比, 该方法频带更宽, 动态范围更大, 测量过程操作简单, 对地震计灵敏度自检具有重要意义。

关键词: 力平衡反馈式地震计, 反馈线圈, 反馈力系数, 阻尼系数

Abstract: The feedback force coefficient of the force balance feedback seismometer is a technical parameter composed of multiple physical quantities, which plays an important role in the sensitivity and instrument response of the seismometer. The existing method of measuring the feedback force coefficient carries out static calculation and measurement by measuring the magnetic induction intensity of the magnetic cylinder, the length of the coil and the mass of the pendulum. This method is used within the natural frequency whose frequency band is very narrow. Also, it is greatly affected by the mechanical properties of the pendulum. In this paper, a dynamic testing method is proposed to calculate the feedback force coefficient by measuring the relevant physical quantities at different frequency points in the frequency band higher than the natural frequency. The testing process is decoupled from the mechanical pendulum, so that the testing has nothing to do with the mechanical properties of the pendulum. The experimental test shows that the measurement result of this method is stable within 6 times of natural frequency. The relative accuracy is 4% and the absolute accuracy is 0.29 m·s^-2·A^-1. Compared with the traditional method, this method has wider frequency band, larger dynamic range and simple operation. It is of great significance to self-test the sensitivity of seismometer.

Key words: Force balance feedback seismometer, Feedback coil, Feedback force coefficient, Damping coefficient

中图分类号:

P315.6

张兵, 李珍, 朱小毅, 薛兵, 苏鹏, 吴旭, 黄诗. 力平衡反馈式地震计反馈力系数动态测试研究[J]. 地震, 2022, 42(4): 175-183.

ZHANG Bing, LI Zhen, ZHU Xiao-yi, XUE Bing, SU Peng, WU Xu, HUANG Shi. Study on Dynamic Testing of Feedback Force Coefficient of Force Balance Feedback Seismometer[J]. EARTHQUAKE, 2022, 42(4): 175-183.

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力平衡反馈式地震计反馈力系数动态测试研究

Study on Dynamic Testing of Feedback Force Coefficient of Force Balance Feedback Seismometer

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