涂覆有TPB的PTFE在可见光、UV和VUV下的反射率和荧光特性与厚度的函数关系
Reflectance and fluorescence characteristics of PTFE coated with TPB at visible, UV, and VUV as a function of thickness
摘要：
聚四氟乙烯（PTFE）是一种性能优良的漫反射器，广泛应用于粒子物理实验的光收集系统中。在贵元素系统中，它通常涂有四苯基丁二烯（TPB），以允许检测真空紫外闪烁光。在这项工作中，这种依赖性进行了研究的PTFE涂层TPB在空气中的波长为200~nm，260~nm，和450~nm的光。结果表明，在450 nm波长处，TPB涂层的PTFE在5~ 10 mm厚度范围内的反射率约为92%，在此范围内，其反射率随厚度的变化可以忽略不计。使用氩气室对这些结果进行交叉检查，支持厚度从5 mm到10 mm的变化不会显著影响128 nm处的光响应的结论。我们的研究结果表明，TPB涂层的PTFE片薄于典型的10毫米，可用于粒子物理探测器，而不影响光信号。
英文摘要：
Polytetrafluoroethylene (PTFE) is an excellent diffuse reflector widely used in light collection systems for particle physics experiments. In noble element systems, it is often coated with tetraphenyl butadiene (TPB) to allow detection of vacuum ultraviolet scintillation light. In this work this dependence is investigated for PTFE coated with TPB in air for light of wavelengths of 200~nm, 260~nm, and 450~nm. The results show that TPB-coated PTFE has a reflectance of approximately 92\% for thicknesses ranging from 5~mm to 10~mm at 450~nm, with negligible variation as a function of thickness within this range. A cross-check of these results using an argon chamber supports the conclusion that the change in thickness from 5~mm to 10~mm does not affect significantly the light response at 128~nm. Our results indicate that pieces of TPB-coated PTFE thinner than the typical 10~mm can be used in particle physics detectors without compromising the light signal.
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