擾動(dòng)空隙對稻谷電容式水分傳感器精度的影響

摘要 ［目的］揭示擾動(dòng)空隙對電容式稻谷水分傳感器檢測精度的影響規(guī)律。［方法］基于Ansoft Maxwell 靜電場分析模塊，建立并試驗(yàn)驗(yàn)證了稻谷群粒電容分析模型；基于上述模型，分別對平行極板式、同軸極板式、平面極板式電容谷物水分傳感器開展了擾動(dòng)空隙模擬試驗(yàn)。［結(jié)果］稻谷含水率為11.39%～ 30.30%，群粒表觀介電常數(shù)隨含水率升高而增大，平均變化范圍為5.74～41.13；稻谷群粒電容分析模型計(jì)算結(jié)果的相對誤差小于5%，證實(shí)了該分析模型的有效性；擾動(dòng)空隙模擬試驗(yàn)顯示，擾動(dòng)空隙越大，引起的水分檢測誤差越大；相同擾動(dòng)空隙下，含水率越大，檢測誤差越大，擾動(dòng)空隙分布在不同的位置對檢測的影響程度不一樣，分布在電容器中電場線越密集的區(qū)域，引起的誤差越大；此外，模擬試驗(yàn)獲得了3種不同類型的電容式稻谷水分傳感器的平均檢測極差分布規(guī)律，表明平行極板水分傳感器檢測精度受擾動(dòng)空隙影響最小，同軸極板次之，平面極板受影響最大。［結(jié)論］研究結(jié)果對優(yōu)化電容式谷物水分傳感器設(shè)計(jì)、降低擾動(dòng)空隙引起的檢測誤差、提高檢測精度和可靠性等方面具有參考意義。

關(guān)鍵詞 稻谷；水分傳感器；電容；擾動(dòng)空隙；Ansoft Maxwell

中圖分類號(hào) S22 文獻(xiàn)標(biāo)識(shí)碼 A 文章編號(hào) 0517-6611（2024）21-0173-06

doi：10.3969/j.issn.0517-6611.2024.21.036

開放科學(xué)（資源服務(wù)）標(biāo)識(shí)碼（OSID）：

Effect of Disturbance Gaps on the Accuracy of Rice Capacitive Moisture Sensor

FANG Zhuang-dong，SUN Bin-yi，PENG Yuan-xuan et al

（Shanwei Academy of Agricultural Sciences， Shanwei， Guangdong 516600）

Abstract ［Objective］To explore the effect of disturbance gaps on the detection accuracy of capacitive rice moisture sensors.［Method］A rice capacitance analysis model was developed and validated using the Ansoft Maxwell electrostatic field analysis module.Simulation experiments were conducted on parallel， coaxial， and planar capacitive rice moisture sensors based on the model. ［Result］Within the moisture content range of 11.39% to 30.30%， the apparent dielectric constant of rice grains increased with moisture content， with an average variation ranging from 5.74 to 41.13.The relative error of the rice capacitance analysis model was less than 5%， the model’s effectiveness was confirmed. Simulation experiments revealed that larger disturbance gaps lead to greater moisture detection errors.With the same disturbance gap， higher moisture content resulted in higher detection errors. Disturbance gaps located in different positions affected detection differently， with areas of dense electric field lines in capacitors exhibiting larger errors;moreover， simulation experiments identified patterns in the distribution of average detection tolerances across three types of capacitive rice moisture sensors， indicating that parallel plate sensors were least affected by disturbance gaps， followed by coaxial plates， and planar plates were most affected. ［Conclusion］The research results have reference significance for optimizing the design of capacitive grain moisture sensors， reducing detection errors due to disturbance gaps and enhancing both accuracy and reliability.

Key words Rice;Moisture sensor;Capacitance;Disturbance gap;Ansoft Maxwell

基金項(xiàng)目 汕尾市省科技專項(xiàng)資金“大專項(xiàng) +任務(wù)清單”項(xiàng)目（220126-225850658）。

作者簡介 方壯東（1989—），男，廣東揭陽人，博士，從事智能農(nóng)業(yè)裝備技術(shù)研究。

收稿日期 2024-05-27；修回日期 2024-07-10

水分在線檢測技術(shù)可快速連續(xù)測量谷物含水率，為干燥控制系統(tǒng)提供水分信息反饋，是實(shí)現(xiàn)干燥過程動(dòng)態(tài)跟蹤和閉環(huán)控制的關(guān)鍵技術(shù)環(huán)節(jié)之一［1］。……