作者：赵亚林, 王学影, 郭斌
作者单位：中国计量学院计测学院, 浙江 杭州 310018
关键词：微量气体泄漏;二氧化碳气体;浓度差;标准漏孔;等效漏率;测量准确度
摘要：
针对当前工业上泄漏检测方法存在检测精度低、成本高等缺点,设计一种微量泄漏检测方法。该方法利用二氧化碳气体作为示踪物质,充满纯二氧化碳气体的被测件通过标准漏孔产生泄漏,气体进入检测容器中,通过二氧化碳气敏传感器测量检测容器内二氧化碳浓度的变化得到微量气体泄漏的泄漏率。与工业生产中传统的气密性检测方法相比,该方法在提高准确度的同时保证测试的准确性,并且能降低成本。试验结果表明:该检测方法测试的准确性不受温度和湿度变化的影响;在不同压力测试条件下,实测值与标准漏孔参考值误差3%,验证方法的准确性;在相同压力测试条件下,测试结果相对标准偏差5%,实验重复性良好。
Leak detection method based on carbon dioxide sensor
ZHAO Yalin, WANG Xueying, GUO Bin
College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China
Abstract: To solve the low detection accuracy and high cost of current industrial air-leakage detection methods, a new trace leak detection method with carbon dioxide as a tracer was developed. Pure CO2 gas in the measured parts entered a detection container through standard leaks, and the changes in CO2 gas concentration in the detection container was measured with a CO2 gas sensor to obtain the gas leakage rate. Compared with the conventional gas-tightness detection methods used in industrial production, the proposed method has improved the detection accuracy and reduced the detection cost. The experimental data show that the accuracy of the method is no longer affected by changes in temperature and humidity. The error between the measured and reference leak value is less than 3% under different pressures, which has verified the accuracy of the method. In the same pressure, the relative standard deviation of the test results is less than 5%, which has verified the experimental reproducibility.
Keywords: trace gas leak;CO2;concentration difference;standard leak;equivalent leak rate;detection accuracy
2015, 41(10): 30-33,62 收稿日期: 2015-04-12;收到修改稿日期: 2015-06-06
基金项目: 浙江省公益性技术应用研究计划(2014C31105)
作者简介: 赵亚林(1989-),女,云南宣威市人,硕士研究生,专业方向为汽车零部件和精密仪器检测。
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