αβ表面沾染检测仪温度补偿技术

Temperature Compensation Technology of α and β Surface Contamination Detector

针对传统αβ沾染检测仪设计中未考虑温度影响,测量结果受温度影响较大,无法满足高、低温环境使用要求的问题,为提高仪器在高、低环境下的测量稳定性,在不改变原理设计的条件下研究其温度补偿方法。通过对传统αβ沾染检测仪射线检测原理、脉冲甄别原理以及温度漂移现象进行分析,确定了温度漂移规律和原因,对现有电路进行微调,提出了增益补偿和阈值补偿2种方法,并进行试验验证。试验结果表明:增益补偿法、阈值补偿法均有较好的补偿效果,有效解决仪器在高、低温环境下测量误差较大的问题,使设备达到新的环境适应性要求,高低温环境下测量误差均小于±20%。

Aiming at the problem that traditional α β contamination detector design ignore the temperature effect, which lead to the measurement accuracy is influenced by the environment temperature, the equipment can＇t meet the requirements in high and low temperature environment. In order to improve the measurement stability in high and low temperature without changing the design principle of the equipment, research the temperature compensation method. By analyze the detection principle of traditional αβ contamination detector, pulse discriminated principle and temperature drift, find out the temperature drift principle and reason, modify the current circuit, and put forward gain compensation and threshold compensation, and verify them by test. The test results show that two methods both have good compensation effects on the problem. Effectively solves the problem of high measurement error in high and low temperature environment. The equipment can meet the requirements of new environmental adaptability, and the measurement error is less than 20% no matter in high or low temperature environment.