Studies On Infrared Temperature Measurement And Data Storage System Based On EPICS

Accelerator driven system(ADS)consists of a high current proton accelerator,a high power spallation target and a sub-critical reactor.Among them,as the coupling unit of the high current proton accelerator and the sub-critical reactor,the high power spallation target needs to sustain the bombardment of high current proton beam and produce spallation neutron to drive sub-critical reactor,to keep the nuclear transmutation working constantly.Therefore,this not only takes into consideration the beam intensities and thermal power density it can resisted,but also to ensure that it can produce the highest neutron yield after being bombarded by protons.Granular flow target is a newly proposed high-power spallation target,which combines the advantages of solid target and liquid heavy metal target,and can withstand beam power higher than existing targets.Therefore,in order to test the heat transferring performance of granular flow target,researchers built a granular heat transfer platform.This paper introduces the infrared temperature measuring system which designed for the granular heat transfer platform.By the virtue of high sensitivity,quick response,wide measuring range,non-contact temperature measurement for the infrared temperature measuring technology,this paper adopts infrared thermal imager to measure the temperature of tungsten alloy particles at the outlet of heat exchanger.The infrared temperature measurement system is based on EPICS architecture design of the distributed system.Through the integration of NI hardware platform,infrared thermal imager equipment and Oracle database to realize the online collecting,monitoring,controlling and real-time storage of experimental data of granular heat transfer platform.This paper used the secondary development kit(SDK)integrate the thermal infrared imager into the EPICS system.The infrared image is used to more intuitively show the real-time temperature distribution of particles,and the temperature data on the infrared image is extracted to compared with the measurement data of thermocouple,further testing the feasibility of using the infrared thermal imager as a real-time temperature measurement device of particles.Secondly,high power spallation target experiments are usually carried out under intense radiation environment,and there has a huge experimental data size.In order to ensure data security,this paper builds a high-speed data storage system based on EPICS.The system uses PC,Oracle database,router and network cable interface,LabVIEW shared variable engine,EPICS I/O server and LAN to realize the remote data high-speed transmission between two PCs.This paper tests three different database storage methods in data store: LabSQL?OCI?SQL*Loader.Through contrastive analysis and combined with the experimental requirements,finally selected SQL * Loader to store the data in the Oracle database.The producer / consumer mode is adopted to realize the parallel processing between the two threads of data transmission and storage,thus established a complete high-speed data storage system.The experimental results showed that the integrated operation software of the thermal infrared imager can extract and store the temperature values in the infrared image in real time,which fully meets the concrete needs of the experiment.Moreover,after repeated testing,the high-speed data storage system achieves the ideal result of 0% packet loss in the process of data transmission and database storage.