Abstract

To solve various engineering problems, it is often necessary to record signals in the 0.1–2000 Hz range. The lower limit of this range is beyond the operating band of geophones. This article considers extending of geophone frequency responses in two ways: multiplication of the transfer functions and introduction of negative resistance. The applicability limits of these methods are estimated. The upper limit of the velocity recorded by the geophone is determined by the gap in which the coil is shifted relative to the sensor frame. The lower limit depends on the total instrument noise of the measurement channel, the main contribution to which is the Brownian noise of the mechanical oscillatory system and the noise of the measuring circuit. A prototype was constructed using multiplication of the transfer functions. Laboratory measurements on a shaking table and microseismic noise recordings demonstrated that the modified geophone operates as a velocity sensor with an eigenfrequency of 2 Hz. This value depends on the microseismic conditions of where of the measurement system is placed. Recording seismicity with the modified geophone made it possible to record massive blasts in mines and quarries in the frequency range up to 2 Hz. Thus, the research demonstrates that the modified geophone can be used to monitor local and regional seismicity as a counterpart to short-period seismometers.

中文翻译：

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扩展检波器幅频响应的仪器方法

摘要

为了解决各种工程问题，通常需要记录0.1–2000 Hz范围内的信号。该范围的下限超出了地震检波器的工作范围。本文考虑以两种方式扩展地震检波器的频率响应：传递函数的乘积和负电阻的引入。估计了这些方法的适用范围。地震检波器记录的速度的上限由线圈相对于传感器框架移动的间隙确定。下限取决于测量通道的总仪器噪声，其主要贡献是机械振荡系统的布朗噪声和测量电路的噪声。使用传递函数的乘积来构造原型。实验室在振动台上进行的测量和微震噪声记录表明，改进的地震检波器可作为本征频率为2 Hz的速度传感器使用。该值取决于测量系统所处位置的微震条件。使用改进的地震检波器记录地震活动，可以记录频率高达2 Hz的矿山和采石场中的大规模爆炸。因此，研究表明，改进的地震检波器可作为短周期地震仪的替代品，用于监测局部和区域地震活动。使用改进的地震检波器记录地震活动，可以记录频率高达2 Hz的矿山和采石场中的大规模爆炸。因此，研究表明，改进的地震检波器可作为短周期地震仪的替代品，用于监测局部和区域地震活动。使用改进的地震检波器记录地震活动，可以记录频率高达2 Hz的矿山和采石场中的大规模爆炸。因此，研究表明，改进的地震检波器可作为短周期地震仪的替代品，用于监测局部和区域地震活动。