Extremely Fast 1 μmol · mol−1 Water-Vapor Measurement by a 1 mm Diameter Spherical SAW Device
Extremely Fast 1 μmol · mol−1 Water-Vapor Measurement by a 1 mm Diameter Spherical SAW Device
复制标题
使用 1 mm 直径球形 SAW 装置极快地测量 1 μmol·mol−1 水蒸气
DOI：
10.1007/s10765-012-1223-z
复制
发表时间：
2012
影响因子：
2.2
通讯作者：
M. Motozawa
中科院分区：
文献类型：
--
作者：
N. Takeda;M. Motozawa
当声表面波(SAW)在球面上被激发时，自然准直的SAW围绕赤道传播数百次。表面吸附和/或反应的分子会影响传播特性，如传播速度和幅度，这些变化是通过多次传播积累起来的。这使得能够高度灵敏地检测包括水蒸气在内的吸附分子。本文报道了直径1 mm的球形声表面波传感器的研制和测试，该传感器能够测量氮气中浓度远低于1μ·−·1H2O的水蒸气。从10%到90%的球面声表面波传感器，到从干氮气到1mmolmol.μ−1H2O在氮气中的阶跃变化，S大约需要15分钟。
When a surface acoustic wave (SAW) is excited on a spherical surface, a naturally collimated SAW propagates around the equator hundreds of times. The propagation characteristics such as the velocity and amplitude are affected by adsorbed and/or reacted molecules on the surface, and the changes are accumulated by multiple turns of propagation. This enables highly sensitive detection of adsorbed molecules including water vapor. In this paper, the development and testing of a 1 mm diameter spherical SAW sensor, which is capable of measuring water vapor at concentrations well below 1 μmol · mol−1H2O in N2, are reported. The rise time from 10% to 90% of the spherical SAW sensor to a step change from dry N2to 1 μmol · mol−1H2O in N2was approximately 15 s.