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前言频率从100赫左右一直低到零频(直流)的低频现象的测量,涉及不同学科和广泛的领域。在这些测量中,一般都用传感器将非电量变换为电量后再进行记录。例如:地震波速度和频谱的变化是研究地震预报前兆的手段,必须采用高质量的地震记录仪;大型水坝、桥梁等重大工程和建筑物要采用经济而有效的抗震结构,就必须从设计到建成都作有关振动频谱的测量和分析;在工矿、交通和水利等大型工程施工中,利用工业大爆破将大量土石方定向地抛到指定地点是节约人力、物力和时间的一种好方法,它的炸药量有时达千吨级,必须作爆破观测和记录以检验其效能和波及影响;近于吨
Preface The measurement of low-frequency phenomena with frequencies ranging from about 100 Hz down to zero-frequency (DC) involves a wide range of disciplines and fields. In these measurements, sensors are typically used to convert non-electricity to electricity before recording. For example, the change of seismic velocity and frequency spectrum is the means to study the precursory of earthquake prediction, and high-quality seismic recorders must be used. For major projects such as large dams and bridges and economical and effective seismic structures, it is necessary to go from design to construction Chengdu made the vibration spectrum measurement and analysis; in the mining, transportation and water conservancy projects such as large-scale construction, the use of industrial blasting a large number of earth and stones directed to the designated place is a good way to save manpower, material and time, its Explosives sometimes reach the level of thousands of tons, must be exploded observations and records to test its effectiveness and impact; nearly t