干旱区生态环境知识资源中心(Arid): Low-Error Soil Moisture Sensor Employing Spatial Frequency Domain Transmissometry

Arid

DOI	10.3390/s22228658
	Low-Error Soil Moisture Sensor Employing Spatial Frequency Domain Transmissometry
	Saito, Tadaomi; Oishi, Takahiro; Inoue, Mitsuhiro; Iida, Sachio; Mihota, Norihito; Yamada, Atsushi; Shimizu, Kohei; Inumochi, Satoru; Inosako, Koji
通讯作者	Saito, T
来源期刊	SENSORS
EISSN	1424-8220
出版年	2022
卷号	22 期号:22
英文摘要	A new type of soil moisture sensor using spatial frequency domain transmissometry (SFDT) was evaluated. This sensor transmits and receives ultrawideband (1 to 6 GHz) radio waves between two separated antennas and measures the propagation delay time in the soil related to the dielectric constant. This method is expected to be less affected by air gaps between the probes and the soil, as well as being less affected by soil electrical conductivity (EC), than typical commercial sensors. The relationship between output and volumetric water content (theta), and the effects of air gaps and EC were evaluated through experiments using sand samples and the prototype SFDT sensor. The output of the SFDT sensor increased linearly with theta and was not affected by even a high salt concentration for irrigation water, such that the EC of the pore water was 9.2 dS.m(-1). The SFDT sensor was almost unaffected by polyethylene tapes wrapped around the sensor to simulate air gaps, whereas a commercially available capacitance sensor significantly underestimated theta. Theoretical models of the SFDT sensor were also developed for the calibration equation and the air gaps. The calculation results agreed well with the experimental results, indicating that analytical approaches are possible for the evaluation of the SFDT sensor.
英文关键词	dielectric probe time domain reflectometry (TDR) time domain transmissometry (TDT) frequency domain reflectometry (FDR) saline soil arid region
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:000887809600001
WOS关键词	WATER CONTENT ; PERMITTIVITY MEASUREMENTS ; DIELECTRIC-CONSTANT ; CALIBRATION ; PROBES
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/2XILL650/394489
推荐引用方式 GB/T 7714	Saito, Tadaomi,Oishi, Takahiro,Inoue, Mitsuhiro,et al. Low-Error Soil Moisture Sensor Employing Spatial Frequency Domain Transmissometry[J],2022,22(22).
APA	Saito, Tadaomi.,Oishi, Takahiro.,Inoue, Mitsuhiro.,Iida, Sachio.,Mihota, Norihito.,...&Inosako, Koji.(2022).Low-Error Soil Moisture Sensor Employing Spatial Frequency Domain Transmissometry.SENSORS,22(22).
MLA	Saito, Tadaomi,et al."Low-Error Soil Moisture Sensor Employing Spatial Frequency Domain Transmissometry".SENSORS 22.22(2022).