基于分布式温度传感的土壤温度剖面仪

IF 1.8 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Geoscientific Instrumentation Methods and Data Systems Pub Date : 2024-04-26 DOI:10.5194/gi-13-85-2024
Bart Schilperoort, César Jiménez Rodríguez, Bas van de Wiel, Miriam Coenders-Gerrits
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引用次数: 0

摘要

摘要土壤中热量的储存变化是能量平衡的主要组成部分之一,对研究陆地-大气热交换至关重要。然而,由于(垂直)土壤异质性和传感器容易扰动土壤,对其进行测量十分困难。分布式温度传感(DTS)设备在精度和分辨率方面的改进使其在地球科学研究中得到了广泛应用。多项研究表明,土壤温度和土壤热通量的空间分布式测量具有附加值。然而,由于 DTS 测量的空间分辨率(∼30 厘米),使用 DTS 测量土壤温度一般仅限于(水平)空间分布测量。本文介绍了一种利用三维打印螺钉状结构实现(垂直)土壤温度剖面高分辨率测量的装置。一个 50 厘米高的探头是用熔丝三维打印技术制造的,带有一个螺旋槽,用于引导和保护光纤(FO)电缆。这种配置提高了有效的 DTS 测量分辨率,并可抑制沿探头的优先流。该探头经过现场测试,结果与参考传感器一致。DTS 测量的土壤温度具有很高的垂直分辨率,可以在 2.5 厘米的分辨率范围内确定土壤的热扩散率,这比使用离散探头要好很多倍。未来的设计改进可能是使用集成参考温度探头,这样就不需要 DTS 校准浴。这反过来又可以支持将探头 "即插即用 "到架式仪器中,而无需接合电缆或 DTS 设置设计经验。这种设计还可以支持将电导体集成到探头中,并允许热示踪实验以高分辨率得出热容量和深度热导率。
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A distributed-temperature-sensing-based soil temperature profiler
Abstract. Storage change in heat in the soil is one of the main components of the energy balance and is essential in studying the land–atmosphere heat exchange. However, its measurement proves to be difficult due to (vertical) soil heterogeneity and sensors easily disturbing the soil. Improvements in the precision and resolution of distributed temperature sensing (DTS) equipment has resulted in its widespread use in geoscientific studies. Multiple studies have shown the added value of spatially distributed measurements of soil temperature and soil heat flux. However, due to the spatial resolution of DTS measurements (∼30 cm), soil temperature measurements with DTS have generally been restricted to (horizontal) spatially distributed measurements. This paper presents a device which allows high-resolution measurements of (vertical) soil temperature profiles by making use of a 3D-printed screw-like structure. A 50 cm tall probe is created from segments manufactured with fused-filament 3D printing and has a helical groove to guide and protect a fiber-optic (FO) cable. This configuration increases the effective DTS measurement resolution and will inhibit preferential flow along the probe. The probe was tested in the field, where the results were in agreement with the reference sensors. The high vertical resolution of the DTS-measured soil temperature allowed determination of the thermal diffusivity of the soil at a resolution of 2.5 cm, many times better than what is feasible using discrete probes. A future improvement in the design could be the use of integrated reference temperature probes, which would remove the need for DTS calibration baths. This could, in turn, support making the probes “plug and play” into the shelf instruments without the need to splice cables or experience in DTS setup design. The design can also support the integration of an electrical conductor into the probe and allow heat tracer experiments to derive both the heat capacity and the thermal conductivity over depth at high resolution.
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来源期刊
Geoscientific Instrumentation Methods and Data Systems
Geoscientific Instrumentation Methods and Data Systems GEOSCIENCES, MULTIDISCIPLINARYMETEOROLOGY-METEOROLOGY & ATMOSPHERIC SCIENCES
CiteScore
3.70
自引率
0.00%
发文量
23
审稿时长
37 weeks
期刊介绍: Geoscientific Instrumentation, Methods and Data Systems (GI) is an open-access interdisciplinary electronic journal for swift publication of original articles and short communications in the area of geoscientific instruments. It covers three main areas: (i) atmospheric and geospace sciences, (ii) earth science, and (iii) ocean science. A unique feature of the journal is the emphasis on synergy between science and technology that facilitates advances in GI. These advances include but are not limited to the following: concepts, design, and description of instrumentation and data systems; retrieval techniques of scientific products from measurements; calibration and data quality assessment; uncertainty in measurements; newly developed and planned research platforms and community instrumentation capabilities; major national and international field campaigns and observational research programs; new observational strategies to address societal needs in areas such as monitoring climate change and preventing natural disasters; networking of instruments for enhancing high temporal and spatial resolution of observations. GI has an innovative two-stage publication process involving the scientific discussion forum Geoscientific Instrumentation, Methods and Data Systems Discussions (GID), which has been designed to do the following: foster scientific discussion; maximize the effectiveness and transparency of scientific quality assurance; enable rapid publication; make scientific publications freely accessible.
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