干旱区生态环境知识资源中心(Arid): A New Principle for Measuring the Average Relative Humidity in Large Volumes of Non-Homogenous Gas

Arid

DOI	10.3390/s19235073
	A New Principle for Measuring the Average Relative Humidity in Large Volumes of Non-Homogenous Gas
	Lazik, Detlef; de Rooij, Gerrit H.; Lazik, Walter; Meissner, Ralph
通讯作者	Lazik, D (corresponding author), UFZ Helmholtz Ctr Environm Res, Theodor Lieser Str 4, D-06120 Halle, Saale, Germany.
来源期刊	SENSORS
EISSN	1424-8220
出版年	2019
卷号	19 期号:23
英文摘要	Due to the current extent of arid regions, the pressure on available water resources is increasing. A suitable measure for water availability and dynamics in dry soil is the relative humidity of the soil air. Due to the heterogeneity of soil, water inputs, and root water uptake, the humidity of soil air will vary in space. Therefore, area-representative measurement methods are needed to find a representative measure of the soil water status. Existing sensors for the direct determination of relative humidity only represent a single location with a spatial extent of up to several cm. We introduce a new measuring principle that averages over a spatially heterogeneously distributed relative humidity. It is based on the selective diffusion of water vapor pressure through a tubular semipermeable membrane to/from a closed measurement chamber. A measured pressure change is sensitive to the water vapor pressure and enables, without any external calibration, to estimate an average of the relative humidity. The comparison of our first laboratory prototype of the new sensor with calibrated reference sensors for relative humidity in a range of approx. 4 to 100% proves the linearity of the measuring method and its high accuracy. For further optimization improved reference measurement techniques are necessary. A potential application is the improvement of water use efficiency in irrigated agriculture.
英文关键词	relative humidity water vapor pressure sensor vapor-selective membrane tubular form factor representative measurement heterogeneous systems
类型	Article
语种	英语
开放获取类型	gold, Green Published
收录类别	SCI-E
WOS记录号	WOS:000507606200016
WOS关键词	WATER-MOVEMENT ; POROUS MATERIALS ; SENSORS ; TECHNOLOGIES ; EVAPORATION ; SOILS ; FLOW
WOS类目	Chemistry, Analytical ; Engineering, Electrical & Electronic ; Instruments & Instrumentation
WOS研究方向	Chemistry ; Engineering ; Instruments & Instrumentation
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/369765
作者单位	[Lazik, Detlef; de Rooij, Gerrit H.; Lazik, Walter] UFZ Helmholtz Ctr Environm Res, Theodor Lieser Str 4, D-06120 Halle, Saale, Germany; [Meissner, Ralph] UFZ Helmholtz Ctr Environm Res, Lysimeter Stn, Dorfstr 55, D-39615 Falkenberg, Germany
推荐引用方式 GB/T 7714	Lazik, Detlef,de Rooij, Gerrit H.,Lazik, Walter,et al. A New Principle for Measuring the Average Relative Humidity in Large Volumes of Non-Homogenous Gas[J],2019,19(23).
APA	Lazik, Detlef,de Rooij, Gerrit H.,Lazik, Walter,&Meissner, Ralph.(2019).A New Principle for Measuring the Average Relative Humidity in Large Volumes of Non-Homogenous Gas.SENSORS,19(23).
MLA	Lazik, Detlef,et al."A New Principle for Measuring the Average Relative Humidity in Large Volumes of Non-Homogenous Gas".SENSORS 19.23(2019).