Chemical sensing in spatial/temporal domains.
Chemical sensing in spatial/temporal domains.
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DOI：
10.1021/cr068117e
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发表时间：
2008-01
期刊：
影响因子：
62.1
通讯作者：
T. Nakamoto;H. Ishida
中科院分区：
文献类型：
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作者：
T. Nakamoto;H. Ishida
传感器是接收物理或化学信号并将其转换为电信号的装置。物理信号由电磁波、光波和声学波等波携带。物理信号的传感技术已经得到很好的理解并已经建立。另一方面，化学物质所携带的化学信号的传感技术还不成熟，人们认为化学物质是通过分子扩散来移动的。然而，气体分子的扩散速度太慢，在许多条件下无法传输化学信号。化学物质在化学传感器上的传输实际上是由流体动力学控制的。流体动力学提供了两个方面，例如空间域中的信号和时间域中的信号。空间域中的信号与羽流（化学物质的流动轨迹）紧密耦合。
Sensors are devices to receive physical or chemical signals and to convert them into electrical signals. Physical signals are carried by waves such as electromagnetic, optical, and acoustic ones. Sensing technology for physical signals has been well-understood and has already been established. On the other hand, sensing technology for chemical signals, which are carried by chemical substances, is not matured.It is thought that chemical substances are moved by molecular diffusion. However, diffusion velocities of gas molecules are too slow to transport chemical signals under many conditions. The transport of chemical substances onto chemical sensors is actually governed by fluid dynamics. Fluid dynamics offers two aspects such as a signal in spatial domain and one in time domain. A signal in spatial domain is tightly coupled with a plume, a flowing trail of a chemical substance.