In certain specific enclosed spaces(such as reactors),temperature,pressure,and other data on instruments are important guarantees for the safe operation of the system.Under normal circumstances,monitoring data is transmitted to determine whether the system is operating properly.However,this method involves the presence of power and transmission lines,which require drilling or other methods to treat enclosed spaces,which can have a certain impact on their airtightness.This article focuses on the problem of reading data from mechanical dial pointers in enclosed spaces.A radioactive measurement method is adopted,where the mechanical structure dial with a radioactive source placed on the pointer is placed inside the enclosed space.When the dial pointer moves,the position of the radioactive source also changes.A detector is used to measure the radioactive source outside the enclosed space and indirectly read the dial data.The above dial structure was simulated using Geent4 software,and a circular detector array system consisting of six gadolinium gallium aluminum garnet(GAGG∶Ce)scintillator detectors was designed.Based on the relationship between the detection efficiency of the full energy peak and the position obtained from the system simulation,the angle of the position of the radiation source can be accurately read out through fuzzy logic algorithm,thereby achieving the purpose of reading the dial data.The results show that when the radius of the dial is 8.5 cm and the detector spacing is 42°,there is a significant deviation between the simulated calculated angles and the actual angles near 40°,85°,125°,and 170°.Therefore,the model was improved by changing the dial radius to 2.3 cm and the detector spacing to 55°.The relative deviation between the angle and the actual angle was within 1°,which was converted into a temperature error of 0.5 ℃.Finally,the measured data was verified to be within 3° and 1 ℃,meeting the measurement requirements.
维普
万方数据