工程强震观测仪器触发装置的抗干扰设计
AN INTERFERENCE- IMMUNE TRIGGER CIRCUIT FOR STRONG-MOTION RECORDING IN EARTHQUAKE ENGINEERING
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摘要: 工程强震观测是地震科学研究的重要课题之一,而触发式记录则是强地震与工程强震记录的主要方式.利用地震信号(位移,速度或加速度)本身作为触发信号而设计的各类强震观测仪器(PDR-1,2;DR-100,200;GQ-Ⅱ,Ⅲ;QZ-2A 等)所面临的主要困难是如何减小误触与漏触概率,即提高触发器的抗干扰能力,本文对利用地震信号的不同特征参量作为触发信号时的误触与漏触概率作了对比分析,提出了幅度特征--窗口比较器触发电路的设计,在GQ-Ⅱ及 QZ-2A 型仪器的现场使用和抗干扰实验中取得了预期结果.误触与漏触概率降低到1%以下,抗干扰能力明显提高.Abstract: Strong-motion data are essential to earthquake engineering studies. Recorders for strong-motion usually work in the triggering mode. Various types of such recorders e.g., the PDR-1, PDR-2; PDR-100, PDR-200; GQ-Ⅱ, Ⅲ and the QZ-2A are now in use, and seismic displacement, velocity, or acceleration signals have been used as trigger signals. But the chief difficulty encountered is how to make the triggering action immune to various kinds of interference so as to keep missing triggers and false triggers to a minimum. This paper describes an interference-immune trigger circuit. It is now in use in the GQ-Ⅱ and QZ-2A strong-motion recorders which have been tested in the field. Simulation interference tests show that the rates of both missing triggers and false triggers are below one percent.
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[1] M·许华兹,L.肖,信号处理—离散频谱分析、检测和估计,169——174,科学出版社,1982.
[2] 许树声,信号检测与估计,32——43,国防工业出版社,1985.
[3] 赵松年、于允贤,信号分析与遥测技术,152——167地震出版社,1983.
[4] 谢礼立、于双久,强震观测与分析原理,65——72}地震出版社,1982.
[5] Iwan, W. D., Strong——motion earthquake instrument arrays, Proceedings of the International workshop on Strong——Motion Earthquake Instrument Arrays, 9——11 May 2——5, Honolulu, Hawaii, 1978.
[6] Anstey, N. A. ed., Signal characteristics and instrument specifications, 2 edit, Seismic Prospecting Inrtruments, 1, 105——137. Gebriider, Borntraeger, 1981.
[7] Evenden, B. S. and D. R. Stone, ed., Instrument Performance and Testing. Seismic Prospecting Instruments,2, 58——91, Gebruder, Borntraeger, 1981.[1] M·许华兹,L.肖,信号处理—离散频谱分析、检测和估计,169——174,科学出版社,1982.
[2] 许树声,信号检测与估计,32——43,国防工业出版社,1985.
[3] 赵松年、于允贤,信号分析与遥测技术,152——167地震出版社,1983.
[4] 谢礼立、于双久,强震观测与分析原理,65——72}地震出版社,1982.
[5] Iwan, W. D., Strong——motion earthquake instrument arrays, Proceedings of the International workshop on Strong——Motion Earthquake Instrument Arrays, 9——11 May 2——5, Honolulu, Hawaii, 1978.
[6] Anstey, N. A. ed., Signal characteristics and instrument specifications, 2 edit, Seismic Prospecting Inrtruments, 1, 105——137. Gebriider, Borntraeger, 1981.
[7] Evenden, B. S. and D. R. Stone, ed., Instrument Performance and Testing. Seismic Prospecting Instruments,2, 58——91, Gebruder, Borntraeger, 1981.
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