微量Clark型溶解氧传感器透氧膜的研究

设计两组实验，分别对不同材质、不同厚度的透氧膜进行氧气透过性、热收缩性、拉伸性能和耐化学介质浸泡性能的测试和评价，通过比较0.03 mm厚度的聚乙烯（PE）薄膜、聚四氟乙烯（PTFE）薄膜和聚全氟乙丙烯（FEP）薄膜以及0.045 mm和0.05 mm厚度FEP薄膜的测试数据，得出0.03 mm的FEP薄膜综合性能最优的结论。最后，将0.03 mm的FEP透氧膜放入北京华科仪科技有限公司的HK-258便携式溶解氧分析仪，与其原有商用膜进行比较，实验表明0.03 mm的FEP透氧膜具有更快的氧气透过速度和更高的氧气透过率，可以提高自制溶解氧传感器的响应速率，使自制溶解氧传感器达到10^-9级检测精度。

Study on oxygen-permeable membranes in a micro-Clark type dissolved oxygen sensor

We have designed two experiments to test and assess oxygen permeable membranes made of different materials and having different thickness. The parameters investigated were oxygen permeability, thermal contractibility, tensile properties and the effects of immersion in liquids. According to the results of the permeable membrane tests, we analyzed the combined properties of these membranes. The membranes compared were a polyethylene membrane (PE), a polytetrafluoroethylene membrane (PTFE), and a fluorinated ethylene-propylene membrane (FEP), which all had a thickness of 0.03 mm, as well as FEP membranes with thicknesses of 0.045 mm and 0.05 mm. The results showed that the FEP membrane with a thickness of 0.03 mm had the best quality. When compared with a commercial membrane from a portable dissolved oxygen analyzer HK-258 (Beijing Huakeyi Technology Co. Ltd.), the FEP membrane with a thickness of 0.03 mm showed faster oxygen permeation rate and higher oxygen permeability. In summary, if the FEP membrane with a thickness of 0.03 mm is used in a dissolved oxygen sensor, the response rate of the sensor can be improved, and the precision of the sensor can reach the 10^-9 level.