Portable Design Of MRS-TEM Combined Use Groundwater Detection Instrument

The MRS-TEM Combined Use Groundwater Detection Instrument is the soleinstrument which combines two geophysical methods to detect ground water atpresent. Compared with other geophysical prospecting methods, this instrument hassuch features as direct detection and abundant inversion results; in addition, it canmore effectively detect ground water with the complementary advantages of the twogeophysical technologies. But the current Combined Use Groundwater DetectionInstrument, with the problems of large volume and poor stability and reliability,hinders its application in the places where the space is narrow and the environment isharsh, e.g. tunnel and mine. Specific to the shortcomings of the current Combined UseGroundwater Detection Instrument, a portable MRS-TEM Combined UseGroundwater Detection Instrument is developed and the detailed design scheme andtest results are presented in this paper.The domestic and foreign present development situation of the MRS-TEMCombined Use Groundwater Detection Instrument is introduced at first and then theprinciples of underground water detection by nuclear magnetic resonance andtransient electromagnetic methods are explained respectively in this paper. Accordingto the detection principles, portable design for MRS-TEM Combined UseGroundwater Detection Instrument is carried out on the basis of the currentinstrument.The following key technologies are adopted:1. Modular Design TechnologyThe system of MRS-TEM Combined Use Groundwater Detection Instrument iscomplicated with multiple functional circuits and the circuits are mutually shared andcrossed with certain independence which will impact the production, commissioning,maintenance, upgrading and transformation of the system, especially has a largeimpact on the portable design of the system. As a result, during the portable design forthe MRS-TEM system, function analysis is made on each circuit of the system and modular partition is carried out again on the above basis which improves the workingefficiency and portability of MRS-TEM system.2. Digital Design TechnologyPortable design will inevitably change the original structure design and almostall parts and devices need to be redesigned and selected with new model. Theworkload for repeated tests is enormous and will cost a large amount of time andfinancial resources; therefore the advanced three-dimensional simulation aided designtechnology is introduced to carry out the design of MRS-TEM portable system andmodel selection for devices which improves design efficiency and makes the structureof portable system compact and reasonable.3. Reliability Design TechnologyAs a geophysical prospecting instrument mainly focusing on measurement anddetection, normally the tests are conducted in the open and may encounter differentkinds of harsh weather and topographies. The portable system of MRS-TEMCombined Use Groundwater Detection Instrument, specific to solving the detectionproblems of disastrous water source under tunnels, will encounter poorer workingconditions; so it requires that the portable system of MRS-TEM spectrometer hasstrong reliability and stability to adapt to such conditions. As a result, reliabilitydesign is made to some key parts of the portable system of MRS-TEM Combined UseGroundwater Detection Instrument to ensure stable and reliable work of the portablesystem of MRS-TEM Combined Use Groundwater Detection Instrument in differentenvironments.With application of the above key technologies, the volume and weight of thespectrometer is obviously reduced, which improves reliability and stability andgreatly shortens design time and decrease workload and cost.After the design for key technologies, specific design and real-object fabrication is made to each modular of the portable system of MRS-TEM Combined UseGroundwater Detection Instrument, the complete machine design and real-objectassembly is made at last and indoor and outdoor tests are conducted as well. From theresults analysis, the portable instrument of MRS-TEM Combined Use GroundwaterDetection Instrument can satisfy the measurement requirements and effectivelymeasure the underground water with stable and reliable performance.