糧倉(cāng)料位智能檢測(cè)系統(tǒng)研究

摘要：糧食儲(chǔ)藏是國(guó)家為防備戰(zhàn)爭(zhēng)、災(zāi)荒及其它突發(fā)性事件而采取的有效措施，因此，糧食的安全儲(chǔ)藏具有重要意義。針對(duì)糧食儲(chǔ)藏裝置料位檢測(cè)的需要,設(shè)計(jì)了一種以雙電容料位傳感器的智能檢測(cè)系統(tǒng)，雙電容傳感器技術(shù),消除了溫、濕度等干擾因素,使該檢測(cè)系統(tǒng)能適應(yīng)惡劣的工業(yè)環(huán)境。同時(shí)該系統(tǒng)以AT89C51單片機(jī)為微控制器，由雙電容式料位傳感器、傳感器信號(hào)檢測(cè)電路,CPU及顯示電路、報(bào)警電路和系統(tǒng)軟件等構(gòu)成。

關(guān)鍵詞：雙電容式傳感器；單片機(jī)；微小電容測(cè)量電路； C/V轉(zhuǎn)換電路；報(bào)警器

Abstract：Food storage is an effective measure of national preparedness for war, famine and other unforeseen incidents. So the safe of the grain storage is of great significance. In response to the needs of the Level detection for foods storage, this paper describes an intelligent detection system which is based on a two-capacitance sensor. The use of the two-capacitance sensor technology eliminates the interference factors of temperature, humidity and other factors in the detection system, which adapts to the harsh industrial environment. Meanwhile , based on the AT89C51 microcontroller, the system are made up of the double-Level capacitive sensor , the detection circuit of sensor signals, CPU and display circuits, alarm circuits and system software.

Key words: two-capacitance sensor; single chip processor; Small measurement circuit of capacitance; C/V converting circuit; annunciator

目 錄
1 緒論 1
1.1 課題背景 1
1.2 糧倉(cāng)料位檢測(cè)的目的和意義 1
1.3 國(guó)內(nèi)外料位監(jiān)測(cè)的發(fā)展現(xiàn)狀 2
1.4本論文的研究?jī)?nèi)容 2
2 電容式料位傳感器原理、應(yīng)用及發(fā)展 3
2.1 電容式料位傳感器 3
2.1.1 電容式料位傳感器的基本原理 3
2.1.2 目前電容式料位傳感器存在的問(wèn)題與不足 4
2.1.3 電容式料位傳感器的改進(jìn)和其發(fā)展趨勢(shì) 5
3 糧倉(cāng)料位智能檢測(cè)系統(tǒng) 5
3.1電容式傳感器的設(shè)計(jì) 5
3.2系統(tǒng)設(shè)計(jì)方案的確定 7
4 系統(tǒng)硬件電路設(shè)計(jì) 8
4.1 正弦激勵(lì)源電路 8
4.2信號(hào)檢測(cè)電路 8
4.3數(shù)據(jù)采集電路設(shè)計(jì)(A/D) 9
4.4 顯示電路的設(shè)計(jì) 12
4.5 報(bào)警系統(tǒng)電路設(shè)計(jì) 13
4.6 看門(mén)狗電路設(shè)計(jì) 14
5 系統(tǒng)軟件實(shí)現(xiàn) 15
5.1 主程序 16
5.2 數(shù)據(jù)采集子程序 16
5.3 顯示子程序 17
6 結(jié)論 18
參考文獻(xiàn) 18