以地震波作为激励信号校准拾振器灵敏度

摘要

A calibration method taking seismic wave as excitation signals together with an analysis of influencing factors in calibration and an in-depth discussion of reproduction of seismic waves were presented.Using a lower frequency vibration calibration system in institute of engineering mechanics (IEM),a few seismic waves were reproduced and the correlation coefficients were calculated.It was shown that the correlation coefficients are larger than 0.95.In addition,the sensitivity of a vibration transducer was calibrated with the reproduced seismic waves and a sine wave as excitations,respectively,and the results agreed well each other.The method proposed here offered a choice for future seismic instrument calibration.%针对各种测振仪器的校准问题,以地震波作为校准激励信号,对振动比较法校准进行了研究.分析了校准的影响因素,对地震波复现进行了较为详细的研究,在中国地震局工程力学研究所振动计量开放实验室的水平向低频标准振动台上,利用选取的几组地震波实际进行了地震波复现实验,计算了地震波复现的相关系数,结果表明相关系数在0.95以上,较好的实现了地震波复现.最后利用几组不同的地震波作为激励对拾振器灵敏度进行了校准,并和激光绝对法校准结果进行了对比,两种方法获得的灵敏度结果一致性较好.该方法对未来地震仪器的校准提供了一种可供选择的途径.