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为了提高海洋沉积物孔隙度、电阻率和地温梯度原位测量的精度与速度,对微探针孔隙度电阻法测量原理、电阻率测量技术及其影响因素进行了研究,在此基础上,设计了一种采用MEMS加速度传感器进行贯入阻力、姿态测量,运用微珠型NTC热敏电阻进行温度校正及地温梯度测量,采用温纳排列进行电阻率测量的多参数贯入式原位探测微探针。该探针结构简单、体积小,直径不大于20mm;探测速度快。室内实验数据表明,其温度测量误差小于5mK,电导率测量相对误差小于1.2%,孔隙度测量误差小于5%,稳定可靠,操作便捷,具有较高的应用推广价值。
In order to improve the accuracy and speed of in situ measurement of porosity, resistivity and geothermal gradient of marine sediments, the principle of porosimetry, resistivity measurement and its influencing factors were studied. On the basis of this, A MEMS acceleration sensor for penetration resistance, attitude measurement, the use of bead-type NTC thermistor for temperature correction and geothermal gradient measurement, the use of Wien arrangement for resistivity measurement of multi-parameter penetration in situ probing needle. The probe has the advantages of simple structure, small volume, no larger than 20mm in diameter and high detection speed. Laboratory data show that the temperature measurement error is less than 5mK, the relative error of conductivity measurement is less than 1.2%, the porosity measurement error is less than 5%, stable and reliable, easy to operate, and has high application and popularization value.