| Antarctic subglacial lakes are liquid lakes between the Antarctic ice sheet and the subglacial bedrock.Some of these lakes have been isolated from the outside world for tens of millions of years.And other important subject areas play a driving role.Britain,the United States,and Russia have completed field drilling of Antarctic subglacial lakes at the beginning of this century,but the methods they use will cause pollution to the collected lake water samples.This article fully combines the application background of the detector,fully absorbs the design experience of my country's 500 m engineering sampler for the pollution-free detection of subglacial lakes in Antarctica,and completes the development of the measurement and control system for the2500 m detection sampler for subglacial lakes in Antarctica(RECAS).The system can combine the measurement and control system with related systems such as heating,built-in winch,and host computer interaction to realize the pollution-free thermal melting of the detector into the ice cover.When the detector reaches the depth of the sub-ice lake that has been detected and positioned by the ice-borne radar in advance at the time,the scientific load platform was controlled by the ground engineers through the human-computer interaction interface to realize the sampling of the lake water and the analysis of the water environment parameters.The hardware design of the system uses Cortex-M3 microprocessor as the core,uses RS485 bus and power carrier bus to cooperate to realize the communication of the under-ice control system,and uses Modbus bus protocol as the communication protocol between different system modules,and at the same time according to the actual needs of the measurement and control system Carry out low-voltage DC power conversion,communication circuit,cntrol circuit,and other hardware design,and complete the hardware construction of the software development basic platform.The human-computer interaction upper computer software based on the.Net window development tool and the lower computer control system software based on the ?C/OS-III operating system platform constitutes the system software of the detector.The lower computer software realizes the winch,heating,and load.For the control of the platform and other equipment platforms,the host computer interactive software realizes the display of the operating parameters of the under-ice detector,the issuance of the detector control command,the parameter abnormality monitoring,and the interaction of the acousto-optic alarm driver and the Iridium remote observation system.The system module of this system has passed the module function test and the communication test between devices,as well as the low-temperature storage and operation test of the system.After the laboratory test,the measurement and control system and related sub-subject equipment have been combined for several months of joint debugging and test work,and the simulated Antarctic ice sheet hot melt drilling experiment has been completed in the cryogenic laboratory.After the longterm operation,its reliability has been verified sex.In the end,the system participated in the field ice lake drilling experiment and successfully completed the preset-related index tasks.The results show that the measurement and control system developed in this subject meets the functional requirements of hot melt drilling in the Antarctic ice sheet and achieves the expected design goal of the engineering prototype. |
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