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Performance evaluation of two types of heated cables for distributedtemperature sensing-based measurement of soil moisture content 被引量:10
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作者 Dingfeng Cao Bin Shi +3 位作者 Honghu Zhu Kun Zhu Guangqing Wei Kai Gu 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2016年第2期212-217,共6页
Distributed temperature sensing(DTS)using heated cables has been recently developed for distributed monitoring of in-situ soil moisture content.In this method,the thermal and electrical properties of heated cables hav... Distributed temperature sensing(DTS)using heated cables has been recently developed for distributed monitoring of in-situ soil moisture content.In this method,the thermal and electrical properties of heated cables have a significant influence on the measurement accuracy of soil moisture content.In this paper,the performances of two heated cables,i.e.the carbon-fiber heated cable(CFHC)and the metalnet heated cable(MNHC),are studied in the laboratory.Their structures,uniformity in the axial direction,measurement accuracy and suitability are evaluated.The test results indicate that the MNHC has a better uniformity in the axial direction than CFHC.Both CFHC and MNHC have high measurement accuracy.The CFHC is more suitable for short-distance measurement(500 m),while the MNHC can be used for longdistance measurement(>500 m). 展开更多
关键词 Soil moisture content Carbon-fiber heated cable(CFHC) Metal-net heated cable(MNHC) Distributed measurement Optical fiber
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Aircraft Measurements of the Microphysical Properties of Stratiform Clouds with Embedded Convection 被引量:6
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作者 Tuanjie HOU Hengchi LEI +3 位作者 Youjiang HE Jiefan YANG Zhen ZHAO Zhaoxia HU 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2021年第6期966-982,共17页
The presence of embedded convection in stratiform clouds strongly affects ice microphysical properties and precipitation formation.In situ aircraft measurements,including upward and downward spirals and horizontal pen... The presence of embedded convection in stratiform clouds strongly affects ice microphysical properties and precipitation formation.In situ aircraft measurements,including upward and downward spirals and horizontal penetrations,were performed within both embedded convective cells and stratiform regions of a mixedphase stratiform cloud system on 22 May 2017.Supercooled liquid water measurements,particle size distributions,and particle habits in different cloud regions were discussed with the intent of characterizing the riming process and determining how particle size distributions vary from convective to stratiform regions.Significant amounts of supercooled liquid water,with maxima up to 0.6 g m−3,were observed between−3℃ and−6℃ in the embedded convective cells while the peak liquid water content was generally less than 0.1 g m−3 in the stratiform regions.There are two distinct differences in particle size distributions between convective and stratiform regions.One difference is the significant shift toward larger particles from upper−15℃ to lower−10℃ in the convective region,with the maximum particle dimensions increasing from less than 6000μm to over 1 cm.The particles larger than 1 cm at−10℃ are composed of dendrites and their aggregates.The other difference is the large concentrations of small particles(25–205μm)at temperatures between−3℃ and−5℃ in the convective region,where rimed ice particles and needles coexist.Needle regions are observed from three of the five spirals,but only the cloud conditions within the convective region fit into the Hallett-Mossop criteria. 展开更多
关键词 aircraft measurements liquid water content ice particle habit particle size distributions
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A modified soil water content measurement technique using actively heated fiber optic sensor 被引量:4
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作者 Meng Wang Xu Li +3 位作者 Lihong Chen Senquan Hou Guiyan Wu Zhilin Deng 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2020年第3期608-619,共12页
Soil water content measurement is critical in practical engineering.The actively heated fiber Bragg grating optic sensor(FBGS)has great potential of multi-point measurement for soil water content measurement in field.... Soil water content measurement is critical in practical engineering.The actively heated fiber Bragg grating optic sensor(FBGS)has great potential of multi-point measurement for soil water content measurement in field.In this study,the effect of heating time on the measurement accuracy is discussed,and modifications are made for actively heated fiber optic(AHFO)sensors.The results demonstrate that if an integration data analysis method is used,the accuracy and reliability of soil water content measurement with AHFO sensors will be improved.Both a short fiber length and a short-term heating pattern are effective and can help to reduce soil disturbance.With the proposed integration method,a short heating time is guaranteed for measuring the soil water content.Such improvements will reduce the thermal disturbance to soil sample and improve the reliability of measurement. 展开更多
关键词 Fiber bragg grating Carbon fiber heated sensor Unsaturated soil Field monitoring Soil water content measurement
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Comparison between Double Crystals X-ray Diffraction and Micro-Raman Measurement on Composition Determination of High Ge Content Si_(1-x)Ge_(x) Layer Epitaxied on Si Substrate 被引量:1
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作者 Lei ZHAO Yuhua ZUO Buwen CHENG Jinzhong YU Qiming WANG 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2006年第5期651-654,共4页
It is important to acquire the composition of Si1-xGex layer, especially that with high Ge content, epitaxied on Si substrate. Two nondestructive examination methods, double crystals X-ray diffraction (DCXRD) and mi... It is important to acquire the composition of Si1-xGex layer, especially that with high Ge content, epitaxied on Si substrate. Two nondestructive examination methods, double crystals X-ray diffraction (DCXRD) and micro-Raman measurement, were introduced comparatively to determine x value in Si1-xGex layer, which show that while the two methods are consistent with each other when x is low, the results obtained from double crystals X-ray diffraction are not credible due to the large strain relaxation occurring in Si1-xGex layers when Ge content is higher than about 20%. Micro-Raman measurement is more appropriate for determining high Ge content than DCXRD. 展开更多
关键词 Si1-xGex Ge content Composition determination Double crystals X-ray diffraction (DCXRD) Micro-Raman measurement
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STUDY ON AUTOMATIC IN-LINE MEASUREMENT OF FeO CONTENT IN AGGLOMERATE
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作者 王明阳 陈前平 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 1995年第3期53-57,共5页
In this paper, the mechanism of physical method for measuring the FeO content in agglomerate replacing the chemical method is proposed after studying the electromagnetic property of the agglomerate. The microcomputer-... In this paper, the mechanism of physical method for measuring the FeO content in agglomerate replacing the chemical method is proposed after studying the electromagnetic property of the agglomerate. The microcomputer-measuring system for FeO content is provided. Attention is also paid to introducing the working principle of the H-type compensation sensor and the processing method of the measured data. This system has been successfully applied in practice to in-line measure the FeO content. 展开更多
关键词 AGGLOMERATE FeO content in-line measurement SENSOR
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Rapid Measurement of Short Fiber Content on Hertel Sample
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作者 何晓峰 刘文耀 徐守东 《Journal of Donghua University(English Edition)》 EI CAS 2006年第1期125-129,共5页
This paper offers a new method of measuring short fiber content of cotton fibers. The method is composed of two parts: one is Hertel sampling and the other is image testing. With the help of fiber mixer, a thin and ev... This paper offers a new method of measuring short fiber content of cotton fibers. The method is composed of two parts: one is Hertel sampling and the other is image testing. With the help of fiber mixer, a thin and even cotton net is obtained on which we can get Hertel sample by using a sliver clamp. The near micro optical mechanism consists of one large area CCD and one lens with long focus. This mechanism is able to measure every cotton fiber of the test beard accurately and makes it possible to measure accumulating fibers’ amounts. On this base we can calculate short fiber content of cotton, and the experiment results show that this method is efficient. 展开更多
关键词 cotton fiber short fiber content Hertel sampling image measurement fibrogram
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Journal of Measurement Science and Instrumentation Contents of Volume 1(2010)
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《Journal of Measurement Science and Instrumentation》 CAS 2010年第4期406-408,共3页
关键词 Journal of measurement Science and Instrumentation contents of Volume 1 CHO 2010
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Discussion on determination of gas content of coal and uncertainties of measurement 被引量:6
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作者 Abouna Saghafi 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2017年第5期741-748,共8页
Gas content of coal is mostly determined using a direct method, particularly in coal mining where mine safety is of paramount importance. Direct method consists of measuring directly the volume of gas desorbed from co... Gas content of coal is mostly determined using a direct method, particularly in coal mining where mine safety is of paramount importance. Direct method consists of measuring directly the volume of gas desorbed from coal in several steps, from solid then crushed coal. In mixed gas conditions the composition of the desorbed gas is also measured to account for contribution of various coal seam gas in the mix. The determination of gas content using the direct method is associated with errors of measurement of volume of gas but also the errors associated with measurement of composition of the desorbed gas. These errors lead to uncertainties in reporting the gas content and composition of in-situ seam gas. This paper discusses the current direct method practised in Australia and potential errors and uncertainty associated with this method. Generic methods of estimate of uncertainties are also developed and are to be included in reporting gas content of coal. A method of direct measurement of remaining gas in coal following the completion of standard gas content testing is also presented. The new method would allow the determination of volume of almost all gas in coal and therefore the value of total gas content. This method is being considered to be integrated into a new standard for gas content testing. 展开更多
关键词 COAL GAS content measurement methods DESORPTION Adsorption UNCERTAINTIES
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Questions on Optimization of Measurement of Total Electron Content in Ionosphere with GPS
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作者 Arif Shafayat Mehdiyev Ramiz Ahmed Eminov +1 位作者 Hikmat Hamid Asadov Natig Hajiaga Javadov 《Positioning》 2014年第3期66-69,共4页
The analysis of existing method for calculation of total content of electrons (TEC) in ionosphere using GPS occultation method does show that due to different values of signal/noise ration in GPS signals ?and , the ne... The analysis of existing method for calculation of total content of electrons (TEC) in ionosphere using GPS occultation method does show that due to different values of signal/noise ration in GPS signals ?and , the new method of optimum measurements of relevant frequency components of TEC measured by phase and code methods should be developed. The optimum quantity of measurements of the above-mentioned frequency components is determined taking into account the limitation imposed on general number of necessary measurements. 展开更多
关键词 GPS RECEIveR IONOSPHERE OPTIMIZATION TOTAL Electron content measurements
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A distributed measurement method for in-situ soil moisture content by using carbon-fiber heated cable 被引量:14
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作者 Dingfeng Cao Bin Shi +3 位作者 Honghu Zhu Guangqing Wei Shen-En Chen Junfan Yan 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2015年第6期700-707,共8页
Moisture content is a fundamental physical index that quantifies soil property and is closely associatedwith the hydrological, ecological and engineering behaviors of soil. To measure in-situ soil moisturecontents, a ... Moisture content is a fundamental physical index that quantifies soil property and is closely associatedwith the hydrological, ecological and engineering behaviors of soil. To measure in-situ soil moisturecontents, a distributed measurement system for in-situ soil moisture content (SM-DTS) is introduced.The system is based on carbon-fiber heated cable (CFHC) technology that has been developed to enhancethe measuring accuracy of in-situ soil moisture content. Using CFHC technique, a temperature characteristicvalue (Tt) can be defined from temperatureetime curves. A relationship among Tt, soil thermalimpedance coefficient and soil moisture content is then established in laboratory. The feasibility of theSM-DTS technology to provide distributed measurements of in-situ soil moisture content is verifiedthrough field tests. The research reported herein indicates that the proposed SM-DTS is capable ofmeasuring in-situ soil moisture content over long distances and large areas. 展开更多
关键词 In-situ soil moisture content Distributed measurement Carbon-fiber heated cable (CFHC) Fiber-optic sensing
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Laboratory and field experiment on measurement of soil thermal conductivity by probe method
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作者 ZHANG Tong ZHANG Yanjun +2 位作者 LIU Tong XIE Yangyang ZHANG Chi 《Global Geology》 2015年第4期221-225,共5页
The authors presented a new measuring method of the soil thermal conductivity,the probe method,which is designed and made based on the theory of line heat source. This method is used to measure thermal conductivity of... The authors presented a new measuring method of the soil thermal conductivity,the probe method,which is designed and made based on the theory of line heat source. This method is used to measure thermal conductivity of coarse sand,fine sand and silty clay in different water contents. The results that measured by the probe method are well consistent with those of QTM-D_2. The soil thermal conductivity increases in different levels with the increase of the water content. Compared the soil thermal conductivity measured by the probe method in laboratory with in-situ experiment,it shows that the measuring gap gradually increases with the increase of the depth. The reason is that the in-situ measuring thermal conductivity can reflect the actual situation of the soil mass. 展开更多
关键词 probe method thermal conductivity water content in-situ measurement
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Establishment of hydrogen measurement system for magnesium alloy melt
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作者 许四祥 吴树森 +1 位作者 毛有武 安萍 《中国有色金属学会会刊:英文版》 CSCD 2006年第A03期1677-1680,共4页
The equations of hydrogen solubility in pure magnesium and its alloy were deduced based on thermodynamic analysis: for pure magnesium, lgc(H)=0.51g p(H3)-1 332/T+0.568; for AZ91 alloy, lgc(H)=0.51g p(H2)-1 332/T+0.483... The equations of hydrogen solubility in pure magnesium and its alloy were deduced based on thermodynamic analysis: for pure magnesium, lgc(H)=0.51g p(H3)-1 332/T+0.568; for AZ91 alloy, lgc(H)=0.51g p(H2)-1 332/T+0.483. Based on the above equations, a rapid and reliable measurement system for hydrogen content in magnesium melt was set up with CPU controller and electric circuit. With this instrument, measurement experiments were carried out to determine hydrogen content in AZ91 melt. The results show that the actual hydrogen level of AZ91 melt under gas protection varies from 0.06 mL/g to 0.14 mL/g at the temperature range from 650℃to 750℃, and hydrogen content lineally increases with the increase of temperature. 展开更多
关键词 氢组分 镁合金 金属熔炼 热动力学
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Quantitative Analysis of Carbon Content in Bituminous Coal by Laser-Induced Breakdown Spectroscopy Using UV Laser Radiation 被引量:7
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作者 李雄威 毛向雷 +1 位作者 王哲 Richard E.RUSSO 《Plasma Science and Technology》 SCIE EI CAS CSCD 2015年第11期928-932,共5页
The carbon content of bituminous coal samples was analyzed by laser-induced breakdown spectroscopy. The 266 nm laser radiation was utilized for laser ablation and plasma generation in air. The partial least square met... The carbon content of bituminous coal samples was analyzed by laser-induced breakdown spectroscopy. The 266 nm laser radiation was utilized for laser ablation and plasma generation in air. The partial least square method and the dominant factor bused PLS method were used to improve the measurement accuracy of the carbon content of coal. The results showed that the PLS model could achieve good measurement accuracy, and the dominant factor based PLS model could further improve the measurement accuracy. The coefficient of determination and the root-mean-square error of prediction of the PLS model were 0.97 and 2.19%, respectively; and those values for the dominant factor based PLS model were 0.99 and 1.51%, respectively. The results demonstrated that the 266 nm wavelength could accurately measure the carbon content of bituminous coal. 展开更多
关键词 LIBS COAL carbon content PLS quantitative measurement
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Measurement of sugar content in Fuji apples by FT-NIR spectroscopy 被引量:3
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作者 刘燕德 应义斌 《Journal of Zhejiang University Science》 EI CSCD 2004年第6期651-655,共5页
To evaluate the potential of FT-NIR spectroscopy and the influence of the distance between the light source/detection probe and the fruit for measuring the sugar content (SC) of Fuji apples, diffuse reflectance spectr... To evaluate the potential of FT-NIR spectroscopy and the influence of the distance between the light source/detection probe and the fruit for measuring the sugar content (SC) of Fuji apples, diffuse reflectance spectra were measured in the spectral range from 12500 to 4000 cm^-1 at 0 mm, 2 mm, 4 mm and 6 mm distances. Four calibration models at four distances were established between diffused reflectance spectra and sugar content by partial least squares (PLS) analysis. The correlation coefficients (R) of calibrations ranged from 0.982 to 0.997 with SEC values from 0.138 to 0.453 and the SECV values from 0.74 to 1.58. The best model of original spectra at 0 mm distance yielded high correlation determination of 0.918, a SEC of 0.092, and a SEP of 0.773. The results showed that different light/detection probe-fruit distances influence the apple reflective spectra and SC predictions. 展开更多
关键词 FT-NIR spectroscopy Nondestructive measurement Sugar content Fuji apples Partial least squares analysis
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大豆籽粒Ve含量的全基因组关联分析
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作者 张红梅 张威 +6 位作者 王琼 贾倩茹 孟珊 熊雅文 刘晓庆 陈新 陈华涛 《作物学报》 CAS CSCD 北大核心 2024年第5期1223-1235,共13页
维生素E(Ve)是大豆油中一种天然抗氧化剂,是评价大豆油营养价值的重要指标。本研究利用含有264份的大豆自然群体在2021年和2022年测定了籽粒中α-、γ-和δ-生育酚含量,并进行全基因组关联分析(Genome-wide association study,GWAS)。... 维生素E(Ve)是大豆油中一种天然抗氧化剂,是评价大豆油营养价值的重要指标。本研究利用含有264份的大豆自然群体在2021年和2022年测定了籽粒中α-、γ-和δ-生育酚含量,并进行全基因组关联分析(Genome-wide association study,GWAS)。本研究共检测到199个与大豆Ve含量显著关联的SNP位点,其中9个可在2个环境或者2个性状被重复检测到,分别位于3号、7号、11号、12号、13号、15号、17号和18号染色体上。其中位于7号染色体上的显著关联信号是控制α-生育酚含量的主效位点,可在2年环境中被检测到,表型变异解释率为9.83%。对该位点候选基因进行筛选,获得一个编码myb转录因子的基因Glyma.07G054000,可能是这个位点的效应基因。另外,在12号染色体上得到2个编码γ-生育酚甲基转移酶的基因Glyma.12G014200和Glyma.12G014300,有可能是影响Ve含量的重要基因。本研究结果有助于解析大豆籽粒Ve含量的遗传基础及其调控机制,为大豆品质遗传改良奠定了基础。 展开更多
关键词 大豆 籽粒 ve含量 全基因组关联分析 候选基因
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Determination Content of the Magnolol from Magnolia officinalia Leaves by HPLC 被引量:1
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作者 刘存芳 《Agricultural Science & Technology》 CAS 2016年第2期251-255,共5页
[Objective] This study aimed to extract magnolol from wild Magnolia offici- nalia leaves by ultrasonic-assisted extraction. [Method] Magnolol was qualitatively id- entified by coloration method and thin layer chromato... [Objective] This study aimed to extract magnolol from wild Magnolia offici- nalia leaves by ultrasonic-assisted extraction. [Method] Magnolol was qualitatively id- entified by coloration method and thin layer chromatography, and magnolol content in Magnolia officinalia leaves was measured by high performance liquid chromatog- raphy (HPLC). The HPLC was conducted with C18 as the stationary phase while different mobile phases were selected. The measurement wavelength, flow velocity and sample size adopted in the HPLC were 294 nm, 1 ml/min and 20 μl, respec- tively. [Result] Magnolol content in Magnolia officinalia leaves was 0.75%. When methyl alcohol and water with a volume ratio of 78:22 was used as the mobile phase, the retention time of magnolol was 4.528 min and the separation effect was good. In addition, it was easy to operate with good reproducibility and sensitivity. [Conclusion] This method is suitable for the measurement of magnolol content in Maonolia officinalia leaves. 展开更多
关键词 Magnotol content HPLC measurement
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Spectroscopic measurement approaches in evaluation of dry rubber content of cup lump rubber using machine learning techniques
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作者 Amorndej Puttipipatkajorn Amornrit Puttipipatkajorn 《International Journal of Agricultural and Biological Engineering》 SCIE EI CAS 2021年第3期207-213,共7页
Dry rubber content(DRC)is an important factor to be considered in evaluating the quality of cup lump rubber.The DRC analysis requires prolonged laboratory validation.To develop fast and effective DRC determination met... Dry rubber content(DRC)is an important factor to be considered in evaluating the quality of cup lump rubber.The DRC analysis requires prolonged laboratory validation.To develop fast and effective DRC determination methods,this study proposed methods to evaluate the DRC of cup lump rubber using different spectroscopic measurement approaches.This involved a complete fundamental analysis leading to an efficient measurement method based on either point-based measurement using NIR reflectance spectrometer or area-based measurement using hyperspectral imaging.A dataset was prepared that 120 samples were randomly divided into a calibration set of 90 samples and a validation set of 30 samples.To obtain an average spectrum to represent a cup lump rubber sample,the spectral data were collected by locating and scanning for point-based and area-based measurement,respectively.The spectral data were calibrated using partial least squares regression(PLSR)and the least-squares support vector machine(LS-SVM)methods against the reference values.The experiments showed that the area-based measurement approach with both algorithms performed outstandingly in predicting the DRC of cup lump rubber and was clearly better than the point-based measurement approach.The best predictions of PLSR represented by the coefficient of determination(R2),the root mean square error of prediction(RMSEP)and the residual predictive deviation(RPD)were 0.99,0.72%and 15.17,while the best prediction of LS-SVM were 0.99,0.64%and 16.83,respectively.In summary,the area-based measurement based on the LS-SVM prediction model provided a highly accurate estimate of the DRC of cup lump rubber. 展开更多
关键词 cup lump rubber dry rubber content spectroscopic measurement machine learning partial least squares regression least-squares support vector machine
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基于VOF-DPM模型的明渠含沙数值模拟及量水方案比选
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作者 唐渊 马文波 +5 位作者 温红艳 王国强 申丽霞 吴建华 张玉胜 成一雄 《人民黄河》 CAS 北大核心 2024年第11期126-132,148,共8页
为探究含沙水流对明渠流量测量精度的影响,基于Fluent软件采用VOF-DPM模型对明渠进行数值模拟,分别模拟不同进口流速和含沙量组合条件下渠道内流量、液位及泥沙颗粒分布,并将数值模拟结果与试验结果进行对比分析,计算出各量水设施的流... 为探究含沙水流对明渠流量测量精度的影响,基于Fluent软件采用VOF-DPM模型对明渠进行数值模拟,分别模拟不同进口流速和含沙量组合条件下渠道内流量、液位及泥沙颗粒分布,并将数值模拟结果与试验结果进行对比分析,计算出各量水设施的流量误差与液位误差。结果表明:采用VOF-DPM模型可以较好地模拟含沙水流在明渠的流态,通过开展不同流量级的流量测试可知,在不同含沙量条件下,巴歇尔槽流量计误差最小(-3%~1%),超声流量计(-4%~3%)和电磁流量计(-9%~2%)量测效果均较好,雷达流量计误差较大(-20%~4%),说明非接触式流量计在高含沙量、大流量的情况下需进一步提高测量精度;超声液位、电磁液位与雷达液位误差均较大,试验中尾部巴歇尔槽壅水以及泥沙在渠道底部淤积是造成较大液位误差的原因之一。 展开更多
关键词 数值模拟 Vof-DPM模型 含沙量 测流精度
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An Information Content and Set of Common Superconcepts-Based Algorithm to Estimate Similarity between Concepts of Ontologies
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作者 Gbede Sylvain Gbame Maho Wielfrid Morie Konan Marcelin Brou 《Open Journal of Applied Sciences》 2023年第11期1896-1909,共14页
Ontologies have been used for several years in life sciences to formally represent concepts and reason about knowledge bases in domains such as the semantic web, information retrieval and artificial intelligence. The ... Ontologies have been used for several years in life sciences to formally represent concepts and reason about knowledge bases in domains such as the semantic web, information retrieval and artificial intelligence. The exploration of these domains for the correspondence of semantic content requires calculation of the measure of semantic similarity between concepts. Semantic similarity is a measure on a set of documents, based on the similarity of their meanings, which refers to the similarity between two concepts belonging to one or more ontologies. The similarity between concepts is also a quantitative measure of information, calculated based on the properties of concepts and their relationships. This study proposes a method for finding similarity between concepts in two different ontologies based on feature, information content and structure. More specifically, this means proposing a hybrid method using two existing measures to find the similarity between two concepts from different ontologies based on information content and the set of common superconcepts, which represents the set of common parent concepts. We simulated our method on datasets. The results show that our measure provides similarity values that are better than those reported in the literature. 展开更多
关键词 ONTOLOGY Data Structure Similarity Measure Concepts Information content
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Technical Research for Detector of Grain Moisture Content Based on Error Compensation 被引量:1
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作者 Dong Yu-de Yang Xian-long +3 位作者 Ye Fei Pan Kai Jin Xing-chi Shi De-cai 《Journal of Northeast Agricultural University(English Edition)》 CAS 2014年第3期76-83,共8页
According to the existing method including testing the frequency and establishing the relationship between moisture content and frequency, a corresponding instrument was designed. In order to further improve the accur... According to the existing method including testing the frequency and establishing the relationship between moisture content and frequency, a corresponding instrument was designed. In order to further improve the accuracy and rapidity of the system, a new approach to describe the relationship between the measurement error and the temperature was proposed. The error band could be obtained and divided into several parts(based on the range of temperature) to indicate the error value that should compensate the grain moisture content for the changes in temperature. By calculating the error band at the maximum and the minimum operating temperatures, as well as by determining the error compensation value from the error band based on the measurement moisture content, the final effective result was derived. 展开更多
关键词 grain moisture content frequency measurement micro controller unit error compensation mathematical model
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