本文選題：電容檢測(cè)探頭　切入點(diǎn)：電場(chǎng)邊緣效應(yīng)　出處：《南京信息工程大學(xué)》2017年碩士論文

【摘要】：目前市場(chǎng)上常見(jiàn)的油水混合物的水含量檢測(cè)儀因儀器體積、精度以及實(shí)時(shí)測(cè)量等指標(biāo)已逐漸不能滿(mǎn)足人們的日常生活需要,本論文基于電場(chǎng)邊緣效應(yīng)和PCB技術(shù)對(duì)電容檢測(cè)探頭進(jìn)行設(shè)計(jì)并制作出油水混合物的水含量檢測(cè)系統(tǒng)。水含量檢測(cè)系統(tǒng)由所設(shè)計(jì)的環(huán)形檢測(cè)電容探頭、后續(xù)的探頭電容檢測(cè)電路、嵌入式處理器、RS485通信模塊等組成。測(cè)量油水混合物的水含量時(shí),由于水在油中的溶解度很小,導(dǎo)致油水混合物會(huì)出現(xiàn)分層現(xiàn)象,將檢測(cè)電容探頭放置于待檢測(cè)的油水混合物的底部,油水混合物的介電常數(shù)發(fā)生變化,故探頭檢測(cè)到的電容也會(huì)發(fā)生變化。探頭通過(guò)有限元分析軟件COMSOL進(jìn)行仿真優(yōu)化設(shè)計(jì)并通過(guò)PCB技術(shù)實(shí)現(xiàn),探頭電容檢測(cè)電路采用雙通道的28位轉(zhuǎn)換精度的電容檢測(cè)芯片F(xiàn)DC2212,系統(tǒng)的主控芯片采用基于ARM-M4內(nèi)核的STM32F407ZGT6嵌入式處理器,并運(yùn)行μCOS-Ⅲ實(shí)時(shí)嵌入式多任務(wù)操作系統(tǒng);RS485通信模塊可擴(kuò)展與其他手持設(shè)備通信。最終實(shí)驗(yàn)測(cè)試結(jié)果表明,當(dāng)油水混合物的水含量在0%-80%范圍內(nèi),本系統(tǒng)檢測(cè)誤差小于3%,靈敏度可達(dá)到3pF/%,并提升了水含量檢測(cè)儀的測(cè)量精度。
[Abstract]:At present, the water content detector of oil-water mixture which is common in the market has been unable to meet the needs of people's daily life because of the volume, precision and real-time measurement of the instrument. Based on the edge effect of electric field and PCB technology, this paper designs the capacitance detection probe and makes the water content detection system of oil-water mixture. The water content detection system consists of the designed ring detection capacitance probe and the subsequent capacitance detection circuit of the probe. The embedded processor RS485 communication module and so on. When measuring the water content of oil-water mixture, because the solubility of water in oil is very small, the oil-water mixture will appear stratification phenomenon. When the detection capacitance probe is placed at the bottom of the oil-water mixture to be detected, the dielectric constant of the oil-water mixture changes. Therefore, the capacitance detected by the probe will also change. The probe is simulated and optimized by the finite element analysis software COMSOL and realized by PCB technology. The probe capacitance detection circuit uses the two-channel 28-bit conversion precision capacitance detection chip FDC2212, and the main control chip of the system adopts the STM32F407ZGT6 embedded processor based on the ARM-M4 core. The communication module of 渭 COS- 鈪，

本文編號(hào)：1661272