糧倉料位智能檢測系統(tǒng)研究

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

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

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 糧倉料位檢測的目的和意義 1
1.3 國內(nèi)外料位監(jiān)測的發(fā)展現(xiàn)狀 2
1.4本論文的研究內(nèi)容 2
2 電容式料位傳感器原理、應用及發(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題與不足 4
2.1.3 電容式料位傳感器的改進和其發(fā)展趨勢 5
3 糧倉料位智能檢測系統(tǒng) 5
3.1電容式傳感器的設(shè)計 5
3.2系統(tǒng)設(shè)計方案的確定 7
4 系統(tǒng)硬件電路設(shè)計 8
4.1 正弦激勵源電路 8
4.2信號檢測電路 8
4.3數(shù)據(jù)采集電路設(shè)計(A/D) 9
4.4 顯示電路的設(shè)計 12
4.5 報警系統(tǒng)電路設(shè)計 13
4.6 看門狗電路設(shè)計 14
5 系統(tǒng)軟件實現(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 18