Design Of Geological Information Remote Monitoring System Based On Ultra-High Density Resistivity Method

Electrical exploration is an important method in geophysical exploration while the ultra-high density electrical method is a new technology.The ultra-high density electrical method is based on multi-channel technology,utilizing the array of thousands of electrodes and it can switch the electrodes automatically,achieving the transmission,display and storage the data of each electrode and the amount of the data has increased a lot compared to traditional method.Even though there are different types of electric instrument at home and abroad,however,many of them have less acquisition channels,single power supply and poor anti-interference,and also,manual operation is needed on site.These shortcomings result in the inconvenience of exploration in some harsh conditions.The purpose of this paper is to design a new kind of electric instrument system,which has modular units,enhance the anti-interference and uses single supply for uninterrupted power.The system can be controlled to collect,store and transmit data remotely once parameter settings have been initialized on site.This paper will focus on designing a remote monitoring system which is based on the ultra-high density electrical method.The research contents mainly include structural design,hardware design,programming,custom of communication protocol,development of the remote client platform and system debugging.The hardware design includes the master acquisition unit,the expansion unit,the power unit and the wireless transmission unit.A drive circuit based on an SOC STM32 for controlling the relays is designed to cooperate the industrial computer and the acquisition card for power supply and data acquisition.The expansion unit is used to increase the amount of the electrodes.A uninterrupted circuit which is based on the P-channel MOSFET is designed in power supply unit for continuous power to the other instruments on site.The wireless transmission unit is set up by using mature DTU technology for data delivery.The programming includes the program of the master acquisition unit and the remote client platform.In the first part,the program of industrial computer and STM32 are used for initially calculating and transmitting data according to the communication protocols.In the second part,Lab VIEW is used for writing software by triggering different events to achieve the corresponding functions and the data transmission is also based on specific message frame which is referred to ModBus protocol.Wireless transmission function and the remote client platform have been debugged and various tests have also been conducted in laboratory.By comparing and analyzing the data of multiple repetitive experiments,the stability of data acquisition is verified.The data collected on the site is exactly the same as the data received by the remote client platform,showing the high reliability of the system.The remote monitoring system based on the ultra-high density electrical method is mainly used for prospecting geological structure.Real-time remote monitoring of changes in geological information on the field is achievable when the data can be transmitted wirelessly and calculated in a timely manner.Thus,the efficiency of prospecting will be enhanced greatly which human use reduced at the same time.There will be a very significant value in practical application.