大连地震台GM3磁通门磁力仪的维护与应用     

侯永骏  于政轩 《华北地震科学》2002,20(4):47-50

“九五”地磁数字化改造项目仪器配置分为两个部分，绝对观测仪－CTM－磁力仪和相对记录仪－GM3磁通门磁力仪，大连台自仪器装备以来，经过精心安装调试与观测摸索出一套仪器维护与高精度观测的经验，资料精度逐步达到规范要求，2001年11月9日通过验收，被专家组评价为“达到国内领先水平”。  相似文献   

高温超导磁强计的研制及在TEM上的野外试验   总被引：3，自引：0，他引：3  

陈晓东  赵毅  王赤军  吕国印  李汝传  张杰 《地球学报》2002,23(2):179-182

文中介绍了高温超导磁强计的工作原理、特点、所研制的高温超导磁强计的性能指标以及在研制高温超导磁强计的过程中所解决的关键问题，定性地分析了高温超导磁哟计在瞬变电磁法（TEM）上应用的优势。在河北固安以高温超导磁强计做探头和使用传感应线圈做探头在瞬变电磁法（TEM）上进行了野外对比试验。试验结果表明，把高温超导磁强计应用于瞬变电磁法（TEM）上能够加大勘探深度。  相似文献   

地震电磁卫星载荷及现状          下载免费PDF全文

汤吉  赵国泽  陈小斌  詹艳  王继军  肖骑彬 《地球物理学进展》2007,22(3):679-686

系统介绍了法国DEMETER电磁卫星搭载的电场测量仪、磁场测量仪、离子分析仪和高能粒子探测仪的科学目的、简单的工作原理、观测模式以及观测的物理量.同时介绍了国际现有运行的地震电磁卫星搭载的观测仪器，对空间－地面电磁观测系统进行了简要的讨论.这些资料将为我国地震电磁卫星计划的实施提供参考.  相似文献   

质子磁力仪电源系统     

田树德  马光  王树兴  魏连生  曾永忠  王莹楷 《山西地震》2007,(3):31-33

蓄电池过充电和过放电是导致其损坏的主要原因。质子磁力仪电源系统向用户提供了防止过充电和欠充电的铅蓄电池浮充电源、避免过放电的终止放电报警器和恒流输出式地磁分量补偿电源。介绍了该电源系统的性能和特点,各部分电路的工作原理、调试方法及使用注意事项。认为,使用该电源系统,不但可降低蓄电池的容量配制,延长其使用寿命,而且避免了充电和分量补偿电流调节的繁琐操作。  相似文献   

Magnetic mapping for the detection and characterization of UXO: Use of multi-sensor fluxgate 3-axis magnetometers and methods of interpretation   总被引：1，自引：0，他引：1  

Marc Munschy  Daniel Boulanger  Patrice Ulrich  Mustapha Bouiflane 《Journal of Applied Geophysics》2007,61(3-4):168-183

Fluxgate vector magnetometers can be powerful instruments in magnetic mapping and in the detection of unexploded ordnance (UXO). Being lightweight and having low power requirements, they allow the development of multi-sensor use. The main problems in using fluxgate magnetometers arise from calibration errors and drift but these can be overcome using a quick and simple method of calibration in the field. This method also has the advantage of compensating permanent and induced magnetic fields generated by magnetized objects carried with the sensors. Measurement accuracy is similar to that obtained with scalar magnetometers. Multi-magnetometer profiling allows direct inversion of raw magnetic data along profiles in order to locate and characterize dipoles typically generated by UXO. The method used is a non-linear inverse procedure that estimates the three coordinates and magnetization vector of the dipole. Application of the technique to both a synthetic case and a field example illustrates the advantages of the method compared with the use of the analytic signal.  相似文献   

分量质子旋进磁力仪观测误差分析   总被引：1，自引：1，他引：0  

朱兆才 《地震地磁观测与研究》2000,21(2):48-53

分析了影响质子旋进磁力仪和分量质子旋进磁力仪观测质量的因素 ,给出了分量质子旋进磁力仪补偿线圈电流允许误差、补偿线圈定向 (特别是线圈磁南北方向 )应满足的关系式和定向允许误差。提出了分量质子旋进磁力仪的使用要点  相似文献   

分量核旋仪偏置电流对磁偏角测量的影响分析   总被引：5，自引：2，他引：3  

冯志生  杨冬梅  夏忠  张秀霞  梅卫萍  嵇才键 《地震》2002,22(2):60-66

从理论上定量地分析了FHD-1型分量核旋仪的偏置电流对磁偏角观测值的影响,结果表明偏置电流的漂移对磁偏角观测值的影响随偏置电流的漂移量的增大而增大、也随磁偏角观测值的增大而增大,该结果对指导台站提高该仪器磁偏角观测值的精度有一定意义。  相似文献   

Support vector machines‐based modelling of seismic liquefaction potential     

Mahesh Pal 《国际地质力学数值与分析法杂志》2006,30(10):983-996

This paper investigates the potential of support vector machines (SVM)‐based classification approach to assess the liquefaction potential from actual standard penetration test (SPT) and cone penetration test (CPT) field data. SVMs are based on statistical learning theory and found to work well in comparison to neural networks in several other applications. Both CPT and SPT field data sets is used with SVMs for predicting the occurrence and non‐occurrence of liquefaction based on different input parameter combination. With SPT and CPT test data sets, highest accuracy of 96 and 97%, respectively, was achieved with SVMs. This suggests that SVMs can effectively be used to model the complex relationship between different soil parameter and the liquefaction potential. Several other combinations of input variable were used to assess the influence of different input parameters on liquefaction potential. Proposed approach suggest that neither normalized cone resistance value with CPT data nor the calculation of standardized SPT value is required with SPT data. Further, SVMs required few user‐defined parameters and provide better performance in comparison to neural network approach. Copyright © 2006 John Wiley & Sons, Ltd.  相似文献   

Interfacing the DIGICO flux-gate spinner magnetometer to an APPLE IIe microcomputer     

Piotr Tucholka  Jerôme Tessier 《Geophysical Journal International》1987,89(2):705-712

Summary. A hardware configuration and program are described for interfacing a DIGICO spinner rock magnetometer to an APPLE microcomputer. This configuration provides full control of measurements and permits storage of the results on floppy or hard discs. A similar configuration can be used to operate the anisotropy unit.  相似文献   

Prediction of ultimate axial load-carrying capacity of piles using a support vector machine based on CPT data     

《Computers and Geotechnics》2014

The support vector machine (SVM) is a relatively new artificial intelligence technique which is increasingly being applied to geotechnical problems and is yielding encouraging results. In this paper SVM models are developed for predicting the ultimate axial load-carrying capacity of piles based on cone penetration test (CPT) data. A data set of 108 samples is used to develop the SVM models. These data were obtained from the literature containing pile load tests and each sample contains information regarding pile geometry, full-scale static pile load tests and CPT results. Moreover, a sensitivity analysis is carried out to examine the relative significance of each input variable with respect to ultimate strength prediction. Finally, a statistical analysis is conducted to make comparisons between predictions obtained from the SVM models and three traditional CPT-based methods for determining pile capacity. The comparison confirms that the SVM models developed in this paper outperform the traditional methods.  相似文献