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本文介绍了一种用于地震观测的三分向数字式地震事件记录器。采用半导体存储器延迟信号,短时间平均器与长时间平均器对输入信号积分。用事件比较器比较两个输出,当超过给定的阈值时,事件比较器输出电压使自动离合机构工作,同时启动数字磁带机。采样频率有80Hz和40Hz两档,相应的信号延迟时间分别为5.12s和10.24s。观测结果表明,适当选择触发阈值,可将虚警率降低。这种记录器体积小,功耗低,适用于单台观测。
This paper presents a three-directional digital seismic event recorder for seismic observations. The semiconductor memory delay signal, short-time averager and long-time average of the input signal integration. The event comparator compares the two outputs and, when the given threshold is exceeded, the event comparator output voltage causes the automatic clutch mechanism to operate while the digital tape drive is started. The sampling frequency is 80Hz and 40Hz two gears, the corresponding signal delay time is 5.12s and 10.24s respectively. The results show that the proper selection of triggering threshold can reduce the false alarm rate. This recorder small size, low power consumption, suitable for single observation.