Evaluation of a self-correcting dual probe heat pulse sensor
Evaluation of a self-correcting dual probe heat pulse sensor
复制标题
自校正双探头热脉冲传感器的评估
DOI：
10.1016/j.agrformet.2014.09.022
复制
发表时间：
2015-01
影响因子：
6.2
通讯作者：
Horton Robert
中科院分区：
文献类型：
--
作者：
Wen Minmin;Liu Gang;Li Baoguo;Si Bing C.;Horton Robert
双探头热脉冲法（DPHP）可用于土壤热物性的测量。然而，原位探头间距易发生变化，导致土壤热容测量误差较大。新设计的DPHP传感器在温度探头中有两个热敏电阻，可用于计算探头间距的原位变化。该传感器已在共面探针线性偏转的限制条件下进行了测试。也就是说，探针沿直线偏转但不沿不同方向弯曲。然而，实际探头偏转可能不总是共面线性的。在这项研究中，新的DPHP传感器的适用性进行了评估，在细砂和硅砂的各种探头偏转。探针在探针的底端（底部）或顶端（顶部）偏转。结果表明，该传感器能有效地消除共面和非共面测头偏转引起的误差。与底部挠度相比，顶部挠度误差较大。因此，用于修正挠度的理论更适用于底部挠度而不是顶部挠度。由于探头中所用的热敏电阻的响应时间有限，饱和土壤材料的误差大于干燥土壤材料的误差。显然，新设计的DPHP传感器有可能减少现场可能遇到的各种探头偏转引起的误差。
The dual probe heat pulse method (DPHP) can be used to measure soil thermal properties. However, in situ probe spacing is prone to change resulting in large errors of measured soil heat capacityc. A newly designed DPHP sensor has two thermistors in the temperature probe which can be used to calculate in situ changes in probe spacing. This new sensor has been tested under the limited condition of linear coplanar probe deflection. i.e., probes were deflected in-line but were not bent in different directions. However, actual probe deflections may not always be coplanar linear. In this study the applicability of the new DPHP sensor is evaluated in fine sand and in silica sand for a variety of probe deflections. Probes are deflected at the bottom end (bottom) or top end (top) of probes. Results indicate that the new sensor can significantly eliminate errors inccaused by coplanar and non-coplanar probe deflections. Compared with bottom deflections, top deflections have larger errors inc. Thus, theory used to correct for deflections is more applicable to bottom deflections than to top deflections. The errors incfor saturated soil materials are larger than the errors incfor dry soil materials, because of the finite response times of the thermistors used in the probes. Clearly, the newly designed DPHP sensors have the potential for reducing errors caused by various kinds of probe deflections that may be encountered in the field.
登录
查看更多内容
DOI：
10.1016/s0166-2481(08)x7009-6
发表时间：
1985
期刊：
--
影响因子：
--
作者：
G. Campbell
通讯作者：
G. Campbell
影响因子：
6.2
作者：
Bremer, DJ;Ham, JM
通讯作者：
Ham, JM
影响因子：
2.9
作者：
Liu, Gang;Li, Baoguo;Si, Bing C.
通讯作者：
Si, Bing C.
DOI：
10.2136/sssaj1993.03615995005700060008x
发表时间：
1993-11-01
影响因子：
2.9
作者：
KLUITENBERG, GJ;HAM, JM;BRISTOW, KL
通讯作者：
BRISTOW, KL
用于现场校准探头间距的自校准双探头热脉冲传感器
影响因子：
2.9
作者：
Liu, Gang;Wen, Minmin;Horton, Robert
通讯作者：
Horton, Robert