Advanced Development of the Digital Feedback Seismometer

地震学依靠传感器对地面运动的测量来产生加速度。本提案要求支持开发一种地震仪，该地震仪将在力平衡加速度计的反馈回路机制中包含数字控制器。该系统的构造使惯性质量（误差信号）的位置以高速率数字化，然后发送给微处理器，微处理器以所需的方式修改信号以执行，例如数字集成或补偿。然后将微处理器输入传递到数模转换器或其他输出设备，以对传感器的惯性质量产生控制力。因此，地震信号以适合任何给定应用所需输出的速率和精度（位数）来自控制器。与当前的模拟系统相比，该设计的原型地震仪将产生以下改进：整体系统简化，稳定的线性响应和准确的校准，增加的动态范围和对各种传感器系统的适应性。

Seismology depends on the measurement of ground motion by sensors involving an inertial mass to produce an accelerogram. This proposal requests support for the development of a seis- mometer that will incorporate a digital controller in the feedback loop mechanism of a force balance accelerometer. The system is constructed so that position of the inertial mass (the error signal) is digitized at a high rate and then sent to a microprocessor which modifies the signal in the desired manner to perform, for example, digital integration or compensation. The microprocessor input is then passed to a digital-to-analog converter or other output device to produce the controlling forces on the inertial mass of the sensor. The seismic signal consequently comes from the controller at a rate and precision (number of bits) tailored to the output desired for any given application. A prototype seismometer of the proposed design will yield the following improvements over current analog systems: overall system simplification, stable linear response and accurate calibration, increased dynamic range and adaptability to a variety of transducer systems.